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Offline dingxinfda  
#1 Gönderildi : 20 Şubat 2021 Cumartesi 05:14:05(UTC)
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Katılan: 2.2.2021(UTC)
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Austria
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Granular activated carbon (GAC)activated carbon manufacturer in china production from waste materials is of considerable interest. However, waste-derived GACs may exhibit an inferior attrition resistance, inhibiting their use in pressure swing adsorption (PSA) processes or adsorption beds. This study investigated the use of pelletisation to improve the attrition resistance of a sewage sludge-derived GAC. Both extrusion and hydraulic compaction were investigated as pellet production techniques. A range of binders were evaluated, as follows: Ammonium LignoSulphonAte (ALSA); PolyVinyl Alcohol (PVA); phenolic resin; araldite resin; LignoSulphonic Acid, Calcium salt (LSAC); CarboxyMethyl Cellulose sodium salt (CMC). Hydraulic compaction (typically >500 kg/cm2) was found to be more effective than extrusion. Both low (40–110 °C) and high (500–800 °C) curing temperatures were assessed, as was the sequencing of the steam activation and pelletisation steps.activated carbon pellets supplierThe most effective pellet production method comprised coupling a lignosulphonate binder with post-pelletisation activation.
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#2 Gönderildi : 20 Şubat 2021 Cumartesi 05:15:37(UTC)
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Katılan: 2.2.2021(UTC)
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Austria
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yongruida carbon powder
Ca-loaded activated carbon is developed as fuel for direct carbon solid oxide fuel cells (DC-SOFCs), operating without any carrier gas and liquid medium. Ca is loaded on activated carbon through impregnation technique in the form of CaO, which exhibits excellent catalytic activity and significantly promotes the output performance of DC-SOFCs. DC-SOFCs fueled by activated carbon with different Ca loading content (0, 1, 3, 5 and 7 wt. %) are tested and the performances are compared with the DC-SOFC running on the conventional Fe-loaded activated carbon. It is found that the performance of the DC-SOFC with 5 wt. % (373 mW cm−2) and 7 wt. % (378 mW cm−2) Ca-loaded activated carbon is significantly higher than that of the cells operated on 5 wt. % Fe-loaded activated carbon, 1 wt. % and 3 wt. % Ca-loaded activated carbon. The discharging time and fuel utilization of the DC-SOFC with 5 wt. % Ca-loaded activated carbon are also the optimal ones among all the cells. The microstructure, element distribution and carbon conversion rate of the Ca-loaded carbon, the impedance spectra of the corresponding DC-SOFCs are measured. The reasons for the reduced fuel utilization of 7 wt. % Ca-loaded carbon fuel are analyzed and the advantage of Ca-loaded carbon for DC-SOFCs is demonstrated in detail.activated carbon manufacturers in canada
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#3 Gönderildi : 20 Şubat 2021 Cumartesi 05:16:40(UTC)
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Katılan: 2.2.2021(UTC)
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Austria
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Optimization of the adsorption of diclofenac by activated carbon and the acidic regeneration of spent activated carbon
Diclofenac sodium (DCF) is a non-steroidal anti-inflammatory drug. It has been classified as ecotoxic even at low concentrations. In this study, adsorption of DCF on coconut activated charcoal powdercoconut shell-based granular activated carbon (GAC) and regeneration of spent GAC with hydrochloric acid (HCl) were investigated. The results showed that GAC with heterogeneous surface structure adsorbs DCF endothermically with both chemical and physical forces. Adsorption and regeneration processes were optimized with Taguchi Experimental Design. The effects of all parameters affecting the adsorption and regeneration processes were determined by analysis of variance and Pareto analyses. DCF removal of 79.80% was obtained at optimum conditions and the most effective parameter was evaluated as GAC size. At optimum regeneration conditions, 6.85 mg DCF/g GAC adsorption capacity was found with an operating cost of €0.05 g GAC. The amount of HCl was the most effective parameter. It was determined that the regenerated GAC had an adsorptive capacity higher than the adsorptive capacity of the raw GAC during at least three regeneration cycles.activated charcoal pellets bulk Raw, spent and regenerated GACs were characterized by Fourier transform infrared spectrometry and scanning electron microscopy analysis.
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#4 Gönderildi : 21 Şubat 2021 Pazar 05:21:34(UTC)
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Katılan: 2.2.2021(UTC)
Mesajlar: 29
Austria
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Effects of powdered activated carbon on the coagulation-flocculation process in humic acid and humic acid-kaolin water treatment
The addition of powdered activated carbonactivated charcoal powder(PAC) to remove micropollutants is a commonly used technology to improve drinking water quality. However, the effects of PAC dosing strategy on the coagulation-flocculation process of water treatment have not been well understood, especially for water with low amounts of inorganic particles. Therefore, the current research aimed to comprehensively study the effects of simultaneous addition of PAC and aluminum sulfate (AS) coagulants (denoted as PAC-AS) or adding PAC 2 h before coagulation (denoted as PAC2h-AS) on the coagulation behavior in humic acid (HA) and HA-kaolin water treatment. The results showed that the floc size, growth rate, breakage factor, and fractal dimension were all enhanced by PAC-AS and PAC2h-AS for HA but not for HA-kaolin water treatment. In HA water treatment, PAC-AS reached a larger floc size and faster growth rate, while PAC2h-AS achieved a larger floc breakage factor and fractal dimension value. For PAC2h-AS, the pre-adsorption of HA onto PAC would lower the initial particle concentration and reduce the collision probability during HA water coagulation process; thus, the DOC removal efficiency, floc size, and growth rate of PAC2h-AS were relatively smaller than those of PAC-AS. For the floc strength and floc fractal dimension, the pre-adsorption of HA onto PAC contributed to formation of stronger inter-particle bonds; thus, stronger and more compact flocs were formed by PAC2h-AS compared with those of PAC-AS. activated carbon manufacturers uae The addition of PAC had a smaller impact on the floc properties in HA-kaolin water treatment owing to its higher initial particle concentration.
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#5 Gönderildi : 21 Şubat 2021 Pazar 05:25:29(UTC)
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Katılan: 2.2.2021(UTC)
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Austria
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chengde wanyang activated carbonBackground: Gastrointestinal (GI) disorders are commonly associated with chronic conditions such as diabetes, obesity, and hypertension. Direct consequences are obstipation or diarrhea as opposite aspects of the irritable bowel syndrome, and more indirectly, alteration of appetite, feeling of fullness, flatulence, bloatedness, and eventually leading to altered absorption of nutrients. Moreover, GI retention and passage times have been recognized as important factors in determining the release site and hence the bioavailability of orally administered drugs. To facilitate the understanding of physiological and pathological processes involved, it is necessary to monitor the gut motility in animal models. Here, we describe a method for studying the GI transit time using technetium-labeled activated charcoal diethylenetriaminepentaacetic acid (99mTc-Ch-DTPA) detected by single-photon emission computed tomography (SPECT).

Methods: Tc-DTPA was adsorbed onto activated charcoal and administered orally to trypan blue-tainted (n = 4) 129SvEv mice (50 to 80 MBq/animal, n = 11). The exact distribution and movement of radioactivity in the gastrointestinal tract was measured at intervals of 1, 3, 6, 12, and 22 h by SPECT-CT. In addition, in order to validate the imaging of GI transient time, loperamide (0.25 mg/animal, n = 3) was used to delay the GI transit.

Results: The transit time measured as the peak radioactivity occurring in the rectum was 6 to 7 h after gavaging of 99mTc-Ch-DTPA. After 1 h, the bolus had passed into the small intestine and entered the cecum and the colon. At 6 and 8 h, the cecum, the ascending, transverse, and descending colon, and the rectum showed significant labeling. Several pellets were stored in the rectum for defecation. After 22 h, little activity remained in the stomach and none was detected in the transverse colon or other GI locations. In contrast, 6 h after administration of loperamide, only the cecum and part of the transverse colon were labeled. After 22 h, both structures retained significant amount of label. This delay has been verified by non-radiolabeled dye trypan blue GI measurements (n = 4).

Conclusion: Here, we present the first non-invasive study of mouse GI transit time, allowing clear differentiation between vehicle- and loperamide-treated animals. This technique is useful for the investigation of GI motility in mice.
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#6 Gönderildi : 22 Şubat 2021 Pazartesi 04:20:38(UTC)
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Katılan: 2.2.2021(UTC)
Mesajlar: 29
Austria
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Organics removal and in-situ granule activated carbon regeneration in FBR-Fenton/GAC process for reverse osmosis concentrate treatment
Fluidized bed reactor Fenton (FBR-Fenton) process was adopted for reverse osmosis concentrate (ROC) treatment with three types of carriers, including sand, zeolite and granular activated carbon (GAC).chengde wanyang activated carbonAdsorption studies demonstrated that GAC achieved the best adsorption performance (maximum COD removal of 78% in 15 h) among the three carriers, and the adsorption of ROC organic matters followed a two-stage adsorption model. Fenton oxidations were carried out in three fluidized beds after column saturation, and FBR-Fenton/GAC process achieved highest COD removal (72%) and most BOD5/COD ratio enhancement (from 0.03 to 0.3) in ROC. Long-term operation data demonstrated good performance stability of GAC as the carrier. In addition, GAC fluidized bed obtained highest total iron removal rate via iron crystallization process. Continuous in-situ GAC regeneration with more than 90% recoveries of surface area, pore volume and adsorption capacity were observed along the ROC treatment with FBR-Fenton/GAC process.activated carbon pellets bulk Mechanism studies revealed that better COD removal performance in FBR-Fenton/GAC process was attributed to the combining effects of homogenous Fenton reaction, GAC adsorption and GAC/H2O2 catalytic reaction.
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#7 Gönderildi : 22 Şubat 2021 Pazartesi 04:21:39(UTC)
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Katılan: 2.2.2021(UTC)
Mesajlar: 29
Austria
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Two-stage calcination composite of Bi2O3-TiO2 supported on powdered activated carbon for enhanced degradation of sulfamethazine under solar irradiation
In a previous study, we used a sol-hydrothermal method with a one-stage calcination in an air atmosphere at 400 °C to prepare composites of Bi2O3-TiO2 supported on activated charcoal powderpowdered activated carbon (Bi-Ti/PAC-1). However, the photocatalytic efficiency of those composites was relatively low due to their high band gap and the single crystal phase of their TiO2. To improve the photocatalytic efficiency, we developed a two-stage calcination method with a first calcination in air at 300 °C followed by a second calcination in a N2 atmosphere (at 500, 600, or 700 °C) to form the Bi2O3-TiO2 composites (Bi-Ti/PAC-2). Compared with Bi-Ti/PAC-1, the photocatalytic degradation efficiency of sulfamethazine (SMT) by Bi-Ti/PAC-2-700 increased by 32 % under solar light irradiation. Bi-Ti/PAC-2-700 contained two TiO2 crystal phases, rutile and anatase, and its band gap was 2.58 eV, far less than that of Bi-Ti/PAC-1. Electron paramagnetic resonance measurements and trapping experiments showed that the superoxide radical, hole, and hydroxyl radical each played an important role in the degradation of SMT, among which the superoxide radical predominated. The degradation pathway of SMT included four processes: oxidation of hydroxyl radical, SO2 extrusion, Nsingle bondC and Ssingle bondN bond cleavage. We also determined that solution pH, humic acid, and inorganic ions had varying effects on the photocatalytic degradation capability of Bi-Ti/PAC-2-700. activated carbon manufacturers uaeWe measured the efficiency of Bi-Ti/PAC-2-700 for SMT degradation in natural river and lake water and found it to be >85 %, sufficient for practical applications. This study provides a green and efficient photocatalyst that can be applied to water treatment processes.
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#8 Gönderildi : 22 Şubat 2021 Pazartesi 04:22:43(UTC)
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Katılan: 2.2.2021(UTC)
Mesajlar: 29
Austria
Konum: eee56eee

The effect of two different biochars on remediation of Cd-contaminated soil and Cd uptake by Lolium perenne
Biochar can be widely used to reduce the bioavailability of heavy metals in contaminated soil because of its adsorption capacity. But there are few studies about the effects of biochar on cadmium uptake by plants in soil contaminated with cadmium (Cd). Therefore, an incubation experiment was used to investigate the effects of rice straw biochar (RSBC) and coconut shell biochar coconutactivatedcarbon.com(CSBC) on Cd immobilization in contaminated soil and, subsequently, Cd uptake by Lolium perenne. The results showed that the microbial counts and soil enzyme activities were significantly increased by biochar in Cd-contaminated soil, which were consistent with the decrease of the bioavailability of Cd by biochar. HOAc-extractable Cd in soil decreased by 11.3-22.6% in treatments with 5% RSBC and by 7.2-17.1% in treatments with 5% CSBC, respectively, compared to controls. The content of available Cd in biochar treatments was significantly lower than in controls, and these differences were more obvious in treatment groups with 5% biochar. The Cd concentration in L. perenne reduced by 4.47-26.13% with biochar. However, the biomass of L. perenne increased by 1.35-2.38 times after adding biochar amendments. So, Cd uptake by whole L. perenne was augmented by RSBC and CSBC. Accordingly, this work suggests that RSBC and CSBCpellet activated carbon manufacturers have the potential to be used as a useful aided phytoremediation technology in Cd-contaminated soil.
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#9 Gönderildi : 23 Şubat 2021 Salı 04:06:39(UTC)
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Madalyalar: Yeni üye: 10

Katılan: 2.2.2021(UTC)
Mesajlar: 29
Austria
Konum: eee56eee

KOH-super activated carbon from biomass waste: Insights into the paracetamol adsorption mechanism and thermal regeneration cycles
A super activated carbon (SAC)activated charcoal factory was produced by KOH-activation of a biomass waste for paracetamol (PCT) adsorption from aqueous solution and for adsorption-thermal regeneration cycles. The SAC and the regenerated SAC after five adsorption-regeneration cycles (RSAC-5th) were fully characterized by several techniques. The N2 physisorption showed that the SBET values of the SAC and RSAC-5th are remarkably different, being 2794 m² g−1 and 889 m² g−1, respectively. The XPS analysis demonstrated that the SAC surface is composed by oxygen containing-groups, whilst the RSAC-5th also presents nitrogen ones, provenient from the PCT molecules. The adsorption studies revealed that the maximum adsorption capacity (Qm) for the SAC (356.22 mg g−1) is higher than that for RSAC-5th (113.69 mg g−1). Also, the results demonstrated that the PCT adsorption is governed by both physisorption and chemisorption and the ab initio calculations showed the chemisorption mainly occurs in carboxylic groups.activated carbon pellets canada
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#10 Gönderildi : 23 Şubat 2021 Salı 04:16:35(UTC)
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Madalyalar: Yeni üye: 10

Katılan: 2.2.2021(UTC)
Mesajlar: 29
Austria
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Effect of peroxymonosulfate oxidation activated by powdered activated carbon for mitigating ultrafiltration membrane fouling caused by different natural organic matter fractions
Powdered activated carbon (PAC)carbon powderadsorption has been widely applied prior to ultrafiltration membrane for potable water production. However, the impact of PAC adsorption on membrane fouling was still controversial. To solve this problem, combined PAC and peroxymonosulfate (PMS) pretreatment was proposed in this study. The application of PAC/PMS for mitigating membrane fouling by natural organic matter (NOM) has been evaluated, and compared with PMS oxidation or PAC adsorption alone. The influence of NOM fractions on the control efficiency was also investigated using humic acid (HA), bovine serum albumin (BSA), sodium alginate (SA), and their mixture (HA-BSA-SA). The performance was examined through normalized flux decline, fouling resistances analysis, scanning electron microscopy, and model fits. The results indicated that PAC and PMS exhibited a remarkable synergistic effect in the reduction of NOM, with the DOC reduction rates of 53.6%, 24.3%, 27.1% and 31.4% for HA, BSA, SA and HA-BSA-SA, respectively. PAC adsorption exhibited limited influence on mitigating membrane fouling, and the co-existence of PAC and HA even exacerbated fouling due to the synergistic fouling effect between them. By contrast, PAC/PMS pretreatment efficiently reduced both reversible and irreversible fouling resistances. The control efficiency was closely associated with the NOM fractions in the feed water, and followed the order of SA > HA-BSA-SA > BSA > HA. The fouling mitigation by PAC/PMS was attributed to both PAC adsorption and oxidation with SO4radical dot− and radical dotOH.activated carbon suppliers in uae The experimental results are expected to provide a feasible strategy of PAC/PMS for fouling mitigation, and simultaneously solve the problem faced by PAC adsorption.
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#11 Gönderildi : 23 Şubat 2021 Salı 04:17:47(UTC)
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Katılan: 2.2.2021(UTC)
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Austria
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Data showing the effects of vibratory disc milling time on the microstructural characteristics of Coconut Shell Nanoparticles

coconut shell activated carbon pelletsCoconut Shell (CS) as agricultural lignocellulosic biomaterial and agro-waste is predominantly available in India, Malaysia, Nigeria, Thailand, Sri Lanka, and Indonesia. It has proven to have effective durability characteristic, good abstractive resistance, high toughness, and good adsorption properties, and is most suitable for long standing use in many applications such as reinforcement, source of energy, fillers as well as activated carbon and its performance, efficiency and effectiveness depend wholly on whether is in form of nano-, micro-, and macro- particles. In this data, effects of milling time on morphological characteristics was experimented using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), and X-Ray Fluorescence (XRF) analyses. The SEM images were taken at magnifications of 1.00kx, 2.00kx and 5.00kx which gives respective 50 µm, 20 µm and 10 µm in different milling time of 0, 20, 40 and 60 mins. Digital Vibratory Disc Milling Machine (VDMM) rated 380 V/50 Hz at 940 rpm was employed for the grinding and the morphology of the milled nanoparticles were characterised. It was revealed from the data collected that 0 min (i.e. 75 µm sieved) has the highest mean area value of 16.105 µm2 and area standard deviation of 200.738 µm2 with least value of a number of particle size distribution of 809 µm. In contrast, 60 mins milled has the lowest values for mean area and area standard deviation of 8.945 µm2 and 115.851 µm2 respectively with the highest number of particle size distribution of 2032 µm. It was observed that milling time increases the number of particle sizes distributions and reduces the area of particle size.activated carbon pellets
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#12 Gönderildi : 24 Şubat 2021 Çarşamba 04:21:52(UTC)
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Katılan: 2.2.2021(UTC)
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Austria
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Activated carbons of various origins (bituminous coal, wood, coconut shells,coconut shell activated carbon pelletsand peat) were studied as adsorbents of hydrogen sulfide. Before the experiments the surface of the adsorbents was characterized by using the sorption of nitrogen, Boehm and potentiometric titrations, thermal analysis, and FTIR. The adsorbents were chosen to differ in their surface areas, pore volumes, and surface acidities. To broaden the spectrum of surface acidity, carbons were oxidized by using nitric acid and ammonium persulfate. After hydrogen sulfide adsorption the species present on the surface were analyzed using thermal analysis, ion chromatography, and elemental analysis. The H(2)S breakthrough capacity tests showed that the performances of different carbons differ significantly. For a good performance of carbons as hydrogen sulfide adsorbents a proper combination of surface chemistry of carbon and porosity is needed. It was demonstrated that a more acidic environment promotes the formation of sulfur oxides and sulfuric acid despite yielding small H(2)S removal capacities. On the other hand, a basic environment favors the formation of elemental sulfur (sulfur radicals) and yields high capacities. The presence of a sufficient amount of water preadsorbed on the carbon surface to facilitate dissociation also plays an important role in the process of H(2)S adsorption/oxidation. The results showed that there is a critical value in carbon surface acidity, which when exceeded results in a negligible hydrogen sulfide breakthrough capacity. This is consistent with the mechanism of H(2)S adsorption on unmodified carbons, where the rate-limiting step is the reaction of adsorbed hydrogen sulfide ion with dissociatively adsorbed oxygen.activated carbon pellets When the acidity is expressed as pH, its value should be higher than 5 to ensure the effective removal of hydrogen sulfide from the gas phase. Study of carbon regeneration using water washing and heat treatment showed that the adsorbents can be regenerated to about 40% of their initial capacity.
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#13 Gönderildi : 24 Şubat 2021 Çarşamba 04:22:58(UTC)
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Katılan: 2.2.2021(UTC)
Mesajlar: 29
Austria
Konum: eee56eee

Fenton oxidation-based cleaning technology for powdered activated carbon-precoated dynamic membranes used in microfiltration seawater pretreatment systems
In this study, we investigated the performance of powdered activated carbon dynamic membranescarbon powder(PAC DMs) in fouling mitigation strategies during cross-flow microfiltration for high-efficiency seawater pretreatment. By altering the fouling mechanism and water molecule pathway, PAC DMs successfully enhanced the pseudo-steady-state filtration flux and rejection of cross-flow microfiltration by 53% and 29%, respectively, compared to filtration without a PAC DM. Moreover, Fenton oxidation processes (FOPs) application in the DMs’ cross-flow cleaning was studied and showed promising results, recovering up to 28% of the initial filtration flux when used alone and 52% when combined with alkaline cleaning.activated carbon suppliers in uae This study provides insight into the utilization FOPs cleaning technology for PAC DMs cross-flow cleaning, allowing the automation and optimization of DMs operation.
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#14 Gönderildi : 24 Şubat 2021 Çarşamba 04:24:22(UTC)
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Katılan: 2.2.2021(UTC)
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Austria
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The use of natural hierarchical porous carbon from Artemia cyst shells alleviates power decay in activated carbon air-cathode
Activated carbon (AC) activated charcoal factoryair-cathode is demonstrated to be promising for the energy recovery from wastewaters. However, it suffers from the performance decay after long-term operation in microbial fuel cells (MFCs). Here we add a natural hierarchical porous nitrogen-rich carbon material, carbonized Artemia cyst shells (LC), to alleviate the power decay. When the air-cathode is made of a mixture of AC and LC with a mass ratio of 1:2 (named 1AC2LC), the current densities are 28% (the beginning) and 65% (after 1 year's operation) higher than AC cathodes, and the long-term power densities increase from 0.871 ± 0.002 (AC) to 1.296 ± 0.005 W m−2 (1AC2LC) after one year's operation. The Coulombic efficiency increases by 20% than the control. This can be primarily attributed to these inerratic hierarchical pores enhancing oxygen transfer in the catalyst layer since the oxygen mass transfer coefficient is increased by 3.4 times, where the meso- and macro-pores are enlarged, showing the importance of oxygen transfer on the longevity and energy production. Our results show a novel way, addition of inexpensive carbonized Artemia cyst shells, to optimize cathodic porous structure and enhance the longevity of MFCs.activated carbon pellets canada
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