Sprache:



sakurajun's Blog


Bio-derived nanoporous activated carbon sheets as electrocatalyst for enhanced electrochemical water splitting

[url=https://www.yrdcarbon.com/]activated carbon company[/url]Designing highly efficient and durable metal-free electro-catalysts replacing the precious (non)noble metals is crucial to the future hydrogen economy and various renewable energy conversion and storage devices. Herein, we report an efficient low-cost nanoporous activated carbon sheets (NACS) with hierarchical pore architecture from Indian Ooty Varkey (IOV) food waste for oxygen evolution (OER) and hydrogen evolution reactions (HER) by following “waste to wealth creation” strategy. Characterization of NACS carbo-catalyst reveals the presence of pyridinic-nitrogen inherited by self-doping of N from the biomass with high BET surface area (1478.0 m2 g-1). As an electrocatalyst in alkaline medium, it exhibits low-onset potential (1.36 V vs. RHE), an overpotential (η10) of 0.34 V at 10.0 mA cm−2 with a small Tafel value (43 mV dec−1), and good stability towards OER compared to Pt or Ir commercial catalysts. Tested as HER catalyst, it displays an impressive HER activity with a low-onset potential of −0.085 V (vs. RHE), and overpotential (η10) of 0.38 V at 10.0 mA cm−2 with a small Tafel slope of 85 mV dec−1.[url=https://www.yrdcarbon.com/products/activated-carbon/]activated carbon wholesale[/url]

Comprehensive kinetic and mass transfer modeling for methylene blue dye adsorption onto CuO nanoparticles loaded on nanoporous activated carbon prepared from waste coconut shell

[url=https://www.coconutactivatedcarbon.com/]www.coconutactivatedcarbon.com[/url]The waste coconut shell (WCS) was used for the preparation of nanoporous activated carbon (NPAC) by chemical and physical activation method. The synthesized CuO nanoparticles were successfully loaded on the NPAC by the physical adsorption method. Different characterization techniques such as XRD, FT-IR, BET surface area, point of zero charge (pHpzc), SEM, TEM, SADE pattern, particle size distribution, and XPS were used to determine the physical-chemical properties of the CuO-NPAC nanocomposite. Thus, the prepared nanocomposites were used for methylene blue (MB) dye adsorption from aqueous solution by varying batch experimental parameters, such as initial MB dye concentration, initial pH, contact time, temperature, SDS concentration and amount of nanocomposite. In this work, a kinetic model was developed, and the developed kinetic equation was fitted with experimental data, and compared with several traditional models, such as the pseudo-second-order and Elovich models. The mass transfer mechanism was described by four diffusion models, such as Weber-Morris, liquid diffusion, Bangham's and Burt, and McKay et al. models. Adsorption equilibrium data were fitted to non-linear form of conventional isotherm models such as Langmuir, Freundlich, and Sips models, and according to high R2 values, the Sips model was best fitted followed by Langmuir and Freundlich. The possible reaction mechanism for the adsorption of MB onto the CuO-NPAC nanocomposite has also been suggested. The thermodynamic studies confirmed spontaneous adsorption of MB onto CuO-NPAC nanocomposites and showed suitability at high temperatures. [url=https://www.activated-carbon-pellets.com/]carbon pellets manufacturers usa[/url] The regeneration study of nanocomposite was accomplished by HCl, H2SO4, ethanol, double distilled water, and NaOH to determine the suitable reagent for the same.

Removal of Direct Blue-86 dye from aqueous solution using alginate encapsulated activated carbon (PnsAC-alginate) prepared from waste peanut shell

[url=https://www.dxdcarbon.com/]dxdcarbon.com[/url]The alginate encapsulated activated carbon (PnsAC-alginate), prepared from waste peanut shell was used as an adsorbent for the removal of Direct Blue-86 (DB-86) from aqueous solutions. The effects of temperature, extraction time, adsorbent dose, dye concentration and solution pH on the adsorption of DB-86 onto PnsAC-alginate were studied. Central composite design coupled with response surface methodology (RSM) was used to optimize the adsorption feed conditions in order to achieve maximum dye removal efficiency. The statistical analysis revealed that for maximum dye removal efficiency, the optimal conditions were adsorbent dose of 24.65 g L−1, DB-86 dye concentration of 125.5 mg L−1 and pH of 3.1. Under the optimized conditions, experimental dye removal efficiency (98.4 ± 0.1%) agreed closely with the predicted results, indicating the suitability of RSM in optimizing the feed conditions. SEM-EDX, TEM, XRD, BET, and FTIR analyses showed the surface morphology of the adsorbents and confirmed the adsorption of DB-86 onto PnsAC-alginate. The experimental results revealed about 7% enhancement of dye removal efficiency compared to that with unmodified PnsAC adsorbent. The adsorption kinetics of DB-86 was well described by Pseudo second order kinetic model with intra-particle and film diffusion mechanisms. [url=https://www.dxdcarbon.com/product/coal-granular-activated-carbon-price-per-ton]activated carbon price in usa[/url] Langmuir isotherm model provided the best fit to the adsorption equilibrium data, obtaining maximum dye adsorption capacity of 21.6 ± 0.9 mg g−1. Estimation of thermodynamic parameters revealed that adsorption process was feasible with spontaneous and endothermic in nature. The present study demonstrated that use of PnsAC-alginate adsorbent might be cost effective and suitable alternative for removal of DB-86 dye from aqueous solutions.

Preparation and properties of silver nanoparticles loaded in activated carbon for biological and environmental applications

Silver nanoparticles colloid has been prepared by a modified sonoelectrodeposition technique in which a silver plate was used as the source of silver ions. This technique allows producing Ag nanoparticles with the size of 4-30 nm dispersed in a non-toxic solution. The Ag nanoparticles were loaded in a high surface activated carbon produced from coconut husk,[url=https://www.coconutactivatedcarbon.com/]coconut activated charcoal powder[/url] a popular agricultural waste in Vietnam by thermal activation. The surface area of the best activated carbon is 890 m(2)/g. The presence of Ag nanoparticles does not change significantly properties of the activated carbon in terms of morphology and methylene blue adsorption ability. The Ag nanoparticle-loaded activated carbon shows a good antibacterial activity against Escherichia coli with very low minimal inhibitory concentration of 16 μg/ml and strong As(V) adsorption. The materials are potential for prevention and treatment of microbial infection and contamination for environmental applications.

Effects of powdered activated carbon on the coagulation-flocculation process in humic acid and humic acid-kaolin water treatment

The addition of[url=https://www.yrdcarbon.com/products/activated-carbon/powdered-activated-carbon.html]activated carbon powder price[/url](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.[url=https://www.yrdcarbon.com/products/]activated carbon manufacturers in usa[/url] The addition of PAC had a smaller impact on the floc properties in HA-kaolin water treatment owing to its higher initial particle concentration.

Extraordinary supercapacitance in activated carbon produced via a sustainable approach

Supercapacitors, with their high power density and quick charge/discharge capability, have gained attention as the highly desirable energy storage devices. [url=https://www.wyactivatedcarbon.com/]wan yang activated carbon[/url]Recent studies have shown that carbon-based materials with high surface area have huge potential for energy storage applications. It will be interesting if such carbon materials can be produced with desirable characteristics using a green approach. Herein, we report a highly reproducible sustainable approach of producing high surface area activated carbons directly from styrene acrylonitrile (SAN) plastics, obtained from the end-of-life printers. Activated carbons had high specific surface area and pore volume due to the mesopores and micropores generated in the carbon skeleton during the activation process, thus making these activated carbons a good potential candidate for supercapacitor electrode fabrication. We have studied the supercapacitance performance of these activated carbons with varied surface areas by conducting electrochemical experiments using a three-electrode system, with 2 M KOH as electrolyte, at scan rates ranging from 5 to 150 mV/s. While being used as a supercapacitor electrode without the addition of any conductive additives such as carbon black, specific gravimetric capacitance values of as high as 220 F/g were achieved.[url=https://www.wyactivatedcarbon.com/products/activated-carbon-pellets/]activated carbon pellets for air filter[/url] This is an outstanding supercapacitance performance of carbons produced using waste resources.

Effect of powdered activated carbon addition on sludge dewaterability and substrate removal in landfill leachate treatment

The effect of powdered activated carbon[url=https://www.yrdcarbon.com/products/activated-carbon/powdered-activated-carbon.html]powdered activated carbon (pac)[/url] (PAC) addition on substrate removal and sludge dewaterability was investigated in the co-treatment of leachate and domestic wastewater in an activated sludge system. The ratio of leachate in the total wastewater varied from 5 to 25% on a volumetric basis. The inert COD in the leachate could be decreased to very low levels by PAC addition. The specific resistance to filtration (SRF) of the activated sludge peaked during the removal of readily biodegradable COD and then declined when mainly non-biodegradable matter was left over. In the co-treatment case, the SRF of the sludge was shown to increase with an increase in leachate ratio, indicating that the sludge dewaterability (filterability) was negatively affected by the presence of leachate. When leachate was treated alone, the SRF of the sludge was much higher than the SRF of the sludges from domestic wastewater treatment or co-treatment. In any case, the addition of PAC to activated sludge could decrease the residual COD and suppress the peak SRF values.[url=https://www.yrdcarbon.com/products/]activated carbon manufacturers in uae[/url] Overall, the results implied that in practice the addition of PAC addition to activated sludge will have a positive impact on substrate removal and sludge dewaterability. This effect will be most obvious at high leachate inputs.

Surface modification of activated carbon for enhanced adsorption of perfluoroalkyl acids from aqueous solutions

The objective of the research was to examine the effect of increasing carbon surface basicity on uptake of perfluorooctane sulfonic (PFOS) and carboxylic acids (PFOA) by activated carbon. [url=https://www.wyactivatedcarbon.com/]wanyang active carbon[/url]Granular activated carbons made from coal, coconut shell, wood, and phenolic-polymer-based activated carbon fibers were modified through high-temperature and ammonia gas treatments to facilitate systematical evaluation of the impact of basicity of different origins. Comparison of adsorption isotherms and adsorption distribution coefficients showed that the ammonia gas treatment was more effective than the high-temperature treatment in enhancing surface basicity. The resultant higher point of zero charges and total basicity (measured by total HCl uptake) correlated with improved adsorption affinity for PFOS and PFOA. The effectiveness of surface modification to enhance adsorption varied with carbon raw material. Wood-based carbons and activated carbon fibers showed enhancement by one to three orders of magnitudes while other materials could experience reduction in adsorption towards either PFOS or PFOA.[url=https://www.wyactivatedcarbon.com/products/activated-carbon-pellets/]activated carbon pellets suppliers[/url]

Development of an activated carbon impregnation process with iron oxide nanoparticles by green synthesis for diclofenac adsorption

The objective of this study was to impregnate the surface of palm[url=https://www.coconutactivatedcarbon.com/]https://www.coconutactivatedcarbon.com/[/url]coconut activated carbon with nanoparticles of iron compounds using Moringa oleifera leaf extracts and pomegranate leaf by a green synthesis method and to evaluate its adsorption capacity for sodium diclofenac. The adsorbent material was characterized by zeta potential, X-ray diffraction (XRD), N2 adsorption/desorption (BET method), transmission electronic microscopy (TEM), and scanning electronic microscopy (SEM) coupled to dispersive energy spectrometry X-ray (EDX) methods. To evaluate the adsorption capacity of sodium diclofenac, the influence of pH, kinetics, isotherms, and thermodynamic properties were analysed. The impregnated adsorbents showed efficiency in the adsorption of sodium diclofenac. The kinetic model that best fit the experimental data was the pseudo-second-order model, and the equilibrium model was the Langmuir model. As for the thermodynamic study, it was verified that the adsorption reaction for all adsorbents occurs in a spontaneous, favourable way, and it is endothermic by physisorption. [url=https://www.activated-carbon-pellets.com/]activated charcoal pellets near me[/url] Therefore, this process is promising because it is a clean and non-toxic method when compared with chemical methods for the synthesis of nanoparticles.

Activated carbon xerogels derived from phenolic oil: Basic catalysis synthesis and electrochemical performances

The competitiveness of European coal tar distillation plants could be improved by the revaluation of coal-derived liquids and rejects such as phenolic oils, which currently lack high-end applications. [url=https://www.wyactivatedcarbon.com/]chengde wanyang activated carbon factory[/url]In this study, carbon gels were successfully prepared for the first time from phenolic oil by base-catalysed sol-gel polymerisation, by taking advantage of all the major components of phenolic oil rather than the pure, single-component phenolic precursors that are normally used in sol-gel routes. To increase the feasibility of industrial applications, the organic gels were dried under subcritical conditions and the resultant xerogels were submitted to carbonisation and chemical activation in a one-step process, using different KOH to organic gel mass ratios. The resultant ACs were applied as supercapacitor electrodes and attained higher electrochemical performances than carbon gels previously obtained from classic precursors: [url=https://www.wyactivatedcarbon.com/products/activated-carbon-pellets/]wanyang carbon pellets[/url] high capacitance retention up to 74.9% at 12 A g−1, energy and power densities up to 7.37 W h kg−1 and 5.70 kW h kg−1, respectively, high cycling stabilities up to 94.8% after 10,000 charge-discharge cycles, high rate capability of 66% under 1 V s−1 scan rate, and fast frequency response of 0.45 s.


Seiten: 123456folgende »letzte