The Influence of the Activation Temperature on the Structural Properties of the Activated Carbon Xerogels and Their Electrochemical Performance

Quach, Nguyen Khanh Nguyen; Yang, Wein-Duo; Chung, Zen-Ja; Tran, Hoai Lam

doi:10.1155/2017/8308612

Cited by 12 publications

(6 citation statements)

References 17 publications

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“…Increasing the activation temperature reduces the activated carbon yield due to lignin incineration in biomass and the release of more volatile compounds [ 128 ]. Increasing activation temperature also increases narrow micropores and widens the established micropores using activating chemicals due to the melting of compounds found in biomass [ 129 ]. Most of the previous studies supported this statement in their research papers.…”

Section: Methods Of Biomass Activation For the Synthesis Of Acmentioning

confidence: 99%

Activated carbon from biomass precursors using phosphoric acid: A review

Neme

Gonfa

Masi

2022

Heliyon

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Section: Methods Of Biomass Activation For the Synthesis Of Acmentioning

confidence: 99%

Activated carbon from biomass precursors using phosphoric acid: A review

Neme

Gonfa

Masi

2022

Heliyon

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“…Temperature activation of the powders under study was carried out using a solid-state thermostat for 15 min at 37 ˚C [38,39].…”

Section: D-ls-methodsmentioning

confidence: 99%

Preparation, Characterization and Studies of Physicochemical and Biological Properties of Drugs Coating Lactose in Fluidized Beds

et al. 2020

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Objective: Study physicochemical properties and activity of biotechnological drugs coating lactose particles in fluidized beds for the development of a prospective approach of their identification. Methods: Lactose monohydrate as pharmaceutical excipient; affinity-purified polyclonal rabbit antibodies to recombinant human interferon-gamma as a drug substance; Pilotlab fluid bed apparatus was used for lactose powder saturation with solutions of pharmaceutical substances to the point of granulation (pelletizing); inverse light scattering method (2D-LS) for analysis of micron vibrations frequency spectra of samples surfaces for light intensity distribution in time by values of d1, d2, d3 primary descriptors; low angel and dynamic laser light scattering (LALLS, DLS) methods for distribution of lactose-water (LW) supramolecular complexes into volume fractions (micron "size spectra"), using the Master Sizer 2000 instrument and Zeta Sizer Nano ZS instrument in the nanoscale; Spirotox method for research of biological activity to determine the activation energy (Ea) values of cell death in solutions of tested samples. Results: Changes in 2D-LS scattering time on sample surfaces, described by topological descriptors, made it possible to clearly differentiate the intact lactose from fluidized samples by specific corridors in coordinates di=F(t). The calculated activation energy (Ea) values of cell biosensor death process in solutions of drugs coating lactose allow to characterize the biological activity of it in the initial (by Ea increase) and activated state (by Ea decrease) after the creation of intra-laboratory transmucosal conditions. A unique dimensional spectrum of LW complexes in the nanoscale range was obtained by DLS. The differences between samples in the distribution of LW complexes in the size range from 1 µm to 125 µm was showed by LALLS. Conclusion: The developed approach, including Сhemometrics, laser and biotesting methods can be used for qualitative the analysis tasks as well as for analytical control of the fluidization process in cases where identifiable pharmaceutical substances are not distinguishable by traditional analytical methods.

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“…One important observation is that the surface area and pore volume increased from pretreated WS to WS-g-PMMA. Temperature plays a major role in defining the porous structure of biomass material (Daud et al 2003;Lee et al 2014;Quach et al 2017). Many studies have reported the increase in BET surface area and pore volume at higher reaction temperatures involving steam due to expansion/coalescence of the existing micropores to form macropores and also the simultaneous formation of new pores (Daud et al 2003;Zhao et al 2017;Ding et al 2020).…”

Section: Surface Area and Porosity Of Pristine Pretreated And Ws-g-pmmamentioning

confidence: 99%

Poly (methyl methacrylate) grafted wheat straw for economical and eco-friendly treatment of oily wastewater

et al. 2022

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The sustainable development of oil-gas and petrochemical industries necessitates the development of cost-effective and eco-friendly technologies to treat mass-produced oily wastewater discharge from these industries. This study applied a simple radical polymerization to enhance the oil adsorption efficiency of agricultural waste biomass wheat straw (WS) by grafting biocompatible PMMA. Diesel oil adsorption from oil-in-water emulsion using the PMMA grafted WS was thoroughly studied for the first time in the quest of developing an economical and eco-friendly adsorbent for the adsorptive treatment of oily wastewater. Initially, the pristine WS was subjected to alkaline hydrogen peroxide pre-treatment to remove the materials that can lead to secondary pollution during operation, to expose the reactive cellulose surface sites that can enhance grafting efficiency, and to break the inner interconnected tubular pore channel walls; otherwise, the tubular pore channels will not be accessible to viscous oil due to limited capillary penetration. The success of pre-treatment of pristine WS and the subsequent PMMA grafting were evaluated by SEM morphology, BET analysis, EDX and XPS elemental analysis, FTIR, and contact angle measurements. SEM images indicated that the inner interconnected tubular pore channels of WS are exposed significantly upon alkaline hydrogen peroxide pretreatment. PMMA grafting substantially improved oil adhesivity, as evident from the 0 º oil contact angle for WS-g-PMMA film. Oil absorptivity was thoroughly evaluated by batch oil adsorption study using variable adsorbent dosages and oil emulsion concentrations. The WS-g-PMMA exhibited explicitly higher adsorption capacity (ca. 1129 mg/g) compared to that of the pristine (ca. 346 mg/g) and pretreated (ca. 741 mg/g) due to high accessibility to exposed inner interconnected tubular pore channels and strong hydrophobic interactions between the WS-g-PMMA surface and oil droplets. Langmuir and Freundlich adsorption isotherms were applied to evaluate the adsorption mechanism. The experimental data fit well with the Freundlich isotherm, clearly indicating the heterogeneity of adsorption sites, as well as multilayer adsorption of oil. The experimental adsorption data fit well with the pseudo-second-order rate equation with R 2 as high as 0.999, which confirmed the multilayer adsorption of oil. The high oil adsorption capacity of the WS-g-PMMA makes it a very promising material for oily wastewater treatment. This will simultaneously resolve issues with the treatment of oily wastewater and facilitate the recycling of abundant quantities of waste WS. This study serves as a reference for analyzing the suitability of wheat straw for treating extremely challenging waste streams, such as SAGD produced water containing BTEX and PAHs that are also hydrophobic like diesel oil.

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The Influence of the Activation Temperature on the Structural Properties of the Activated Carbon Xerogels and Their Electrochemical Performance

Cited by 12 publications

References 17 publications

Activated carbon from biomass precursors using phosphoric acid: A review

Activated carbon from biomass precursors using phosphoric acid: A review

Preparation, Characterization and Studies of Physicochemical and Biological Properties of Drugs Coating Lactose in Fluidized Beds

Poly (methyl methacrylate) grafted wheat straw for economical and eco-friendly treatment of oily wastewater

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