Insights into aqueous reduction of Cr(VI) by biochar and its iron-modified counterpart in the presence of organic acids

Wen, Jia; Xue, Zhuangzhuang; Yin, Xiyan; Wang, Xue

doi:10.1016/j.chemosphere.2021.131918

Cited by 41 publications

(7 citation statements)

References 48 publications

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“…XPS and DFT simulations confirmed that the strong H-bonds between HCrO 4 and carboxyl/ hydroxyl as well as surface complexation elevated Cr(VI) eradication by O-rich biochar, while for N-rich biochar, coexisting anions depressed Cr(VI) elimination in the order of Cl -> NO 3 -> SO 4 2due to the weaker H-bond interaction between HCrO 4 and protonated amino groups. It is possible to efficiently eliminate Cr(VI) using different biochar-based materials through combined adsorption, reduction, and coprecipitation processes (Ma et al 2022;Ri et al 2022;Wen et al 2022;Zhou et al 2022).…”

Section: Heavy Metal Ionsmentioning

confidence: 99%

Biochar for the removal of contaminants from soil and water: a review

Qiu

Liu

Ling

et al. 2022

Biochar

376

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Biochar shows significant potential to serve as a globally applicable material to remediate water and soil owing to the extensive availability of feedstocks and conducive physio-chemical surface characteristics. This review aims to highlight biochar production technologies, characteristics of biochar, and the latest advancements in immobilizing and eliminating heavy metal ions and organic pollutants in soil and water. Pyrolysis temperature, heat transfer rate, residence time, and type of feedstock are critical influential parameters. Biochar’s efficacy in managing contaminants relies on the pore size distribution, surface groups, and ion-exchange capacity. The molecular composition and physical architecture of biochar may be crucial when practically applied to water and soil. In general, biochar produced at relatively high pyrolysis temperatures can effectively manage organic pollutants via increasing surface area, hydrophobicity and microporosity. Biochar generated at lower temperatures is deemed to be more suitable for removing polar organic and inorganic pollutants through oxygen-containing functional groups, precipitation and electrostatic attraction. This review also presents the existing obstacles and future research direction related to biochar-based materials in immobilizing organic contaminants and heavy metal ions in effluents and soil. Graphical Abstract

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Section: Heavy Metal Ionsmentioning

confidence: 99%

Biochar for the removal of contaminants from soil and water: a review

Qiu

Liu

Ling

et al. 2022

Biochar

376

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“…The negative charges of corn straw samples stem mainly from the phenolic hyd and carboxyl groups of lignin, which are negatively charged in an alkaline mediu shown by their respective zeta potentials (Figure 3) [36]. Generally, in acid treatme interacts with the negative surface of the lignin colloid, making it less negative an creasing particle size, accelerating coagulation [30,36,37]. The decrease in zeta pot The action of the treatments lies in the effectiveness of the lignocellulosic structure, depending on the method used, since the attack takes place on different parts of the substrate by different chemical reagents.…”

Section: Zeta Potentialmentioning

confidence: 99%

“…The negative charges of corn straw samples stem mainly from the phenolic hydroxyl and carboxyl groups of lignin, which are negatively charged in an alkaline medium as shown by their respective zeta potentials (Figure 3) [36]. Generally, in acid treatment, H + interacts with the negative surface of the lignin colloid, making it less negative and increasing particle size, accelerating coagulation [30,36,37]. The decrease in zeta potential on alkaline treatment occurred due to the more effective extraction of soluble lignin in the basic medium, forming lignin colloidal structures with a more negative charge, promoting electrostatic interactions and thereby keeping a stable solution [38].…”

Section: Zeta Potentialmentioning

confidence: 99%

Application of Corn Straw, an Agro-Waste, to Remove Dyes in an Aqueous Medium, Producing Blue or Red Fibers

dos Santos,

Sotiles,

Anaissi

2024

Processes

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The contaminant dyes that, even at low concentrations, may cause a series of adverse effects in humans and animals, and their removal by adsorption methods using alternative adsorbents as natural fibers, are regarded as a research topic that has become increasingly relevant. In this study, corn straw (CS), an agro-industrial residue, was used to remove dyes. The samples were characterized by ATR-FTIR, SEM-EDS, zeta potential, diffuse spectra, and colorimetry, before and after dye removal. The analyses allowed us to differentiate the morphology of CS after the treatment’s fiber on the adsorbent surface. The zeta potential showed a negative surface charge, but the acidic or alkaline treatment affected the surface charge of the sample, influencing the adsorption of cationic or anionic dyes. Adsorption data presented an increased removal when alkaline treatment was applied for the methylene blue (MB; qmax = 16.7 mg g−1), and the acid treatment was more effective for the Congo red (CR; qmax = 2.13 mg g−1). After color stability tests, it was observed that the anionic dye CR was more easily desorbed due to the surface charge of the adsorbent. Due to the chemical treatment, corn straw proved to be a good sustainable adsorbent for removing anionic or cationic dyes from aqueous media, contributing directly to the objective of sustainable development (#6—drinking water and sanitation) and with SDG numbers 3, 11, 12, 14, and 17.

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“…Chromium (Cr), a typical hazardous heavy metal, contributes significantly to wastewater outflow from sectors such as electroplating, pigment production, leather processing, and mining . It is important to note that Cr is carcinogenic, teratogenic, and mutagenic, with the potential for bioaccumulation . Hence, Cr poses substantial hazards to both the ecological system and human well-being.…”

Section: Introductionmentioning

confidence: 99%

Insights into the Mechanism of Efficient Cr(VI) Removal from Aqueous Solution by Iron-Rich Wheat Straw Hydrochar: Coupling DFT Calculation with Experiments

Wei,

Jiang,

Cao

et al. 2024

Langmuir

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Insights into aqueous reduction of Cr(VI) by biochar and its iron-modified counterpart in the presence of organic acids

Cited by 41 publications

References 48 publications

Biochar for the removal of contaminants from soil and water: a review

Biochar for the removal of contaminants from soil and water: a review

Application of Corn Straw, an Agro-Waste, to Remove Dyes in an Aqueous Medium, Producing Blue or Red Fibers

Insights into the Mechanism of Efficient Cr(VI) Removal from Aqueous Solution by Iron-Rich Wheat Straw Hydrochar: Coupling DFT Calculation with Experiments

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