ZnCl 2 -activated biochar from biogas residue facilitates aqueous As(III) removal

Xia, Dong; Tan, Fen; Zhang, Chuanpan; Jiang, Xiuli; Chen, Zheng; Li, Heng; Zheng, Yanmei; Li, Qingbiao; Wang, Qianqian

doi:10.1016/j.apsusc.2016.03.109

Cited by 141 publications

(40 citation statements)

References 46 publications

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“…Nevertheless, chemical adsorption relates to the properties of the adsorbate and the contents of functional groups on the adsorbent surface. Thus, for physical adsorption, the adsorption capacity relies primarily on the specific surface area of the adsorbent, which quantitatively represents the porous structure [21]. Here, the NaOH-activated biochar had higher specific surface area compared with the KOHactivated biochar but lower NH4 + -N adsorption capacity, suggesting that physical adsorption is not the main factor in NH4 + -N adsorption by the biochar.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 89%

“…number of volatile substances [21]. However, no weight losses were observed for the two biochars until the temperature reached 350 °C, and their total weight losses (to 800 °C) were less than 25%, suggesting good thermal stability of the two prepared biochars.…”

Section: Thermogravimetry (Tg)mentioning

confidence: 90%

“…Figure 7 shows the thermogravimetric curves of SDG and NaOH-activated and KOH-activated biochars. The weight loss of SDG started when the temperature was increased to 200 • C, and over 60% weight loss was observed at the temperature of 500 • C, indicating that the SDG contained a large number of volatile substances [21]. However, no weight losses were observed for the two biochars until the temperature reached 350 • C, and their total weight losses (to 800 • C) were less than 25%, suggesting good thermal stability of the two prepared biochars.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 97%

“…Afterward, the SDG samples were ground and placed in a tube furnace (SK2-1-12, Tianye, China) for pyrolysis. The pyrolysis experiments were performed at different temperatures (550, 650, and 750 • C) with a heating rate of 5 • C /min in a sweeping nitrogen gas atmosphere for 2 h, according to the previous study [21]. After pyrolysis, the obtained biochar was washed with excess deionized water three times.…”

Section: Preparation Of Biocharmentioning

confidence: 99%

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

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Adsorption of Ammonium Nitrogen from Aqueous Solution on Chemically Activated Biochar Prepared from Sorghum Distillers Grain

et al. 2019

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Chemically activated biochars prepared from sorghum distillers grain using two base activators (NaOH and KOH) were investigated for their adsorption properties with respect to ammonium nitrogen from aqueous solution. Detailed characterizations, including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetry (TG), and specific surface area analyses, were carried out to offer a broad evaluation of the prepared biochars. The results showed that the NaOH- and KOH-activated biochars exhibited significantly enhanced adsorption capacity, by 2.93 and 4.74 times, respectively, in comparison with the pristine biochar. Although the NaOH-activated biochar possessed larger specific surface area (132.8 and 117.7 m2/g for the NaOH- and KOH-activated biochars, respectively), the KOH-activated biochar had higher adsorption capacity owing to its much higher content of functional groups. The adsorption kinetics and isotherms of the KOH-activated biochar at different temperatures were further studied. The biochar had a maximum adsorption capacity of 14.34 mg/g at 45 °C, which was satisfactory compared with other biochars prepared using different feedstocks. The adsorption process followed pseudo-second-order kinetics, and chemical adsorption was the rate-controlling step. The equilibrium data were consistent with the Freundlich isotherm, and the thermodynamic parameters suggested that the adsorption process was endothermic and spontaneous. Consequently, this work demonstrates that chemically activated biochar from sorghum distillers grain is effective for ammonium nitrogen removal.

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Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 89%

Section: Thermogravimetry (Tg)mentioning

confidence: 90%

Section: X-ray Diffraction (Xrd)mentioning

confidence: 97%

Section: Preparation Of Biocharmentioning

confidence: 99%

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

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Adsorption of Ammonium Nitrogen from Aqueous Solution on Chemically Activated Biochar Prepared from Sorghum Distillers Grain

et al. 2019

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Kinetics of magnesium sulfite oxidation catalyzed by cobalt using a straw/sludge substrate as support

Wang

Zhang

et al. 2018

Env Prog and Sustain Energy

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Oxidation of magnesium sulfite is a key step in the wet magnesia desulfurization. Using the mixture of waste corn stalk (CS) and activated sludge (AS) as a support, the cobalt‐based catalyst was prepared by the impregnation method to promote the oxidation rate. The results indicated that the catalysis performance is highly dependent on the ratio of CS/AS in which 8:2 is the optimal, and that with the cobalt loading of 0.6% dominates the catalytic activity. The physicochemical properties of catalyst were identified by FTIR, XRD, TEM and XPS to reveal the catalytic mechanism. The catalyzed oxidation kinetics of magnesium sulfite was investigated in a bubbling tank. The reaction orders with respect to catalyst, magnesium sulfite and oxygen were achieved to be 0.75, 0 and 0.67, respectively. The apparent activation energy were derived as 34.9 kJ·mol−1. Integrating with a three‐phase reaction model, it was inferred that the overall oxidation is controlled by the inner diffusion of oxygen. The research results can serve as a reference for the development of low‐cost catalytic techniques for the magnesia desulfurization. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 201–207, 2019

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Metal‐Loaded Biochar for the Removal of Arsenic from Water: A Critical Review on Overall Effectiveness, Governing Mechanisms, and Influential Factors

et al. 2022

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Arsenic (As) contamination in water sources is a serious threat to safe drinking water afflicting many developed and developing nations. Among the different water treatment techniques, arsenic removal using metal‐loaded biochar has gained considerable interest as an efficient environmentally sustainable adsorbent. This review critically focuses on an in‐depth analysis of different adsorption mechanisms and various physicochemical properties such as pH, surface area and surface charge, porosity, and functional groups of the metal‐loaded biochar that are significant for As adsorption, which has not been previously described. It centers on addressing the overall effectiveness, governing mechanisms, and influential factors of metal‐loaded biochars for As removal from the aqueous medium. Special consideration on oxidation of arsenite to arsente and its removal was given. The oxidation processes are also effective in reducing arsenic toxicity by oxidation of arsenite to arsenate. A comprehensive insight into the utility of biochar for As removal for future field applications of biochar is delineated.

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ZnCl 2 -activated biochar from biogas residue facilitates aqueous As(III) removal

Cited by 141 publications

References 46 publications

Adsorption of Ammonium Nitrogen from Aqueous Solution on Chemically Activated Biochar Prepared from Sorghum Distillers Grain

Adsorption of Ammonium Nitrogen from Aqueous Solution on Chemically Activated Biochar Prepared from Sorghum Distillers Grain

Kinetics of magnesium sulfite oxidation catalyzed by cobalt using a straw/sludge substrate as support

Metal‐Loaded Biochar for the Removal of Arsenic from Water: A Critical Review on Overall Effectiveness, Governing Mechanisms, and Influential Factors

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