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Enhancement of the electrochemical properties of commercial coconut shell-based activated carbon by H 2 O dielectric barrier discharge plasma

Commercial coconut shell-based activated carbon (CSAC)coconut granular carbon has low specific capacitance and specific capacitance retention owing to its undeveloped pore structure and low proportion of heteroatoms. In this study, dielectric barrier discharge plasma was used to enhance the specific capacitance and rate capability of CSAC. H2O was used as an excited medium to introduce oxygen functional groups. The physico-chemical properties of CSAC and CSAC modified by H2O plasma (HCSAC) were revealed by automated surface area and pore size analysis, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and Raman spectroscopy. Electrochemical work was applied to investigate the electrochemical properties of CSAC...

Study on carbon nanotubes and activated carbon hybrids by pyrolysis of coal

Carbon nanotubes (CNTs)coal activated carbon and activated carbon (AC) hybrids were obtained by co-pyrolysis of potassium hydroxide and bituminous coal. Scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Raman spectroscopy, X-ray Diffraction (XRD), and nitrogen adsorption measurements were used to investigate the characteristics of the samples and the effects of the final pyrolysis temperature and time on the structure of the carbon materials. The results indicated that the optimal range for the pyrolysis temperature and time for CNT growth were 900–950 °C and 45–90 min, respectively. The diameters of the as-prepared CNTs were in the range of 50–250 nm and their lengths were ∼15 μm. During the pyrolysis process...

A silicon carbide nanowire field effect transistor for DNA detection

This work reports on the label-free electrical detection of DNA molecules for the first time, using silicon carbide (SiC) silicon carbide distributorsas a novel material for the realization of nanowire field effect transistors (NWFETs). SiC is a promising semiconductor for this application due to its specific characteristics such as chemical inertness and biocompatibility. Non-intentionally n-doped SiC NWs are first grown using a bottom-up vapor-liquid-solid (VLS) mechanism, leading to the NWs exhibiting needle-shaped morphology, with a length of approximately 2 μm and a diameter ranging from 25 to 60 nm. Then, the SiC NWFETs are fabricated and functionalized with DNA molecule probes via covalent coupling using an amino-terminated...

Adsorption of arsenic from micro-polluted water by an innovative coal-based mesoporous activated carbon in the presence of co-existing ions

A novel, multi-step procedure was introduced to prepare an innovative coal-based activated carbon (M-NCPAC)coal pellet active carbon in the present work. The adsorption characteristics of As(III)/As(V) ions in low concentrations (0.5 mg/L) from an As(III)/As(V) system were studied at 4 °C. The effects of co-existing Cr(VI) on arsenic adsorption by M-NCPAC were also determined as a function of pH, contact time and adsorbent dose in an arsenic-Cr(VI) system. The results suggested that M-NCPAC has well-developed porosity and absorption ability, such as high pore volume (1.1495 cm3/g), mesoporosity (64.22%), iodine numbers (1137 mg/g), and methylene blue (244 mg/g). The optimum pH for arsenic adsorption was identified as 6. M-NCPAC was...

Modeling trichloroethylene adsorption by activated carbon preloaded with natural dissolved organic matter using a modified IAST approach

A model was developed, using an approach based on the Ideal Adsorbed Solution Theory (IAST), to predict trichloroethylene (TCE) adsorption by granular activated carbon (GAC)granular-activated-carbon.com preloaded with natural dissolved organic matter (DOM) isolated from three surface water sources. The IAST model was formulated for a bi-solute system in which TCE and DOM single-solute uptakes were described by the Langmuir-Freundlich and Freundlich isotherms, respectively. The effect of DOM molecular size and polarity (as measured by XAD 8 resin fractionation) on TCE uptake by preloaded GAC was assessed to identify a reactive fraction of natural water DOM for the purpose of modeling competitive adsorption. Consistent with previous work...

Performance of biomorphic Silicon Carbide as particulate filter in diesel boilers

Biomorphic Silicon Carbide (bioSiC) carbide silicon is a novel porous ceramic material with excellent mechanical and thermal properties. Previous studies have demonstrated that it may be a good candidate for its use as particle filter media of exhaust gases at medium or high temperature. In order to determine the filtration efficiency of biomorphic Silicon Carbide, and its adequacy as substrate for diesel particulate filters, different bioSiC-samples have been tested in the flue gases of a diesel boiler. For this purpose, an experimental facility to extract a fraction of the boiler exhaust flow and filter it under controlled conditions has been designed and built. Several filter samples with different microstructures, obtained from...

Increased Recovery of Gold Thiosulfate Alkaline Solutions by Adding Thiol Groups in the Porous Structure of Activated Carbon

wanyang carbon Thiosulfate leaching combined with ion-exchange resins is an innovative alternative for gold recovery. According to the properties of activated carbon, it could replace resins in the gold recovery process, improve efficiency, and reduce operating cost. In this research, the adsorption process of gold thiosulfate complex on thiol-modified activated carbon was studied. Thioglycolic acid (ATG) was impregnated in activated carbon, and its adsorption ability was tested with synthetic solutions of gold and sodium thiosulfate (Au 10 mg·L-1, Na2S2O3 0.1 mol·L-1, pH = 10.0). Carbon was characterized by infrared spectroscopy, SEM-EDS, PZC titration, hardness number measures, and proximal analysis. Synthetic solutions were also...

Effect of Powdered Activated Carbon as Advanced Step in Wastewater Treatments on Antibiotic Resistant Microorganisms

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CdS loaded on coal based activated carbon nanofibers with enhanced photocatalytic property

The coal based activated carbon nanofibers (CBACFs)www.coalactivatedcarbon.comwere prepared by electrospinning a mixture of polyacrylonitrile (PAN) and acid treated coal. Cadmium sulfide (CdS) nanoparticles loaded on CBACFs were fabricated by solvothermal method. The obtained samples were characterized by FESEM, TEM, and XRD. The results reveal that the CdS nanoparticles are homogeneously dispersed on the surfaces of CBACFs. The CdS/CBACFs nanocomposites exhibited higher photoactivity for photodegradation of methyl blue (MB) under visible light irradiation than pure CdS nanoparticles. CBACFs can be used as low cost support materials for the preparation of nanocomposites with high photocatalytic activity.

Activated carbons from bituminous coals by reaction with H3PO4: The influence of coal cleaning

A study has been made to examine the effects of coal cleaning by column flotation on the properties of carbons prepared by the phosphoric acid activation of bituminous coals. www.coalactivatedcarbon.com Earlier work has shown that while moderate surface areas are generated by the reaction of coals with H3PO4 at temperatures around 550°C, phosphoric acid also reacts with coal sulfur and mineral matter. These side reactions consume reagent that is otherwise available for reaction with the organic structure, and result in the formation of insoluble phosphates, increasing the carbon ash content and limiting the amount of recoverable reagent. Lowering the mineral matter content of the coals prior to carbon synthesis is found to have a direct...