Enhanced aqueous phase arsenic removal by a biochar based iron nanocomposite

Shaikh, Wasim Akram; Alam, Md. Arsh; Alam, Md. Osaid; Chakraborty, Sukalyan; Owens, Gary; Bhattacharya, Tanushree; Mondal, N. K.

doi:10.1016/j.eti.2020.100936

Cited by 54 publications

(2 citation statements)

References 68 publications

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“…Nanoscale ZVI-activated carbon increased both As(III) and As(V) adsorption, with maximum adsorption capacities of 18.2 mg g -1 and 12.0 mg g -1 , respectively, at an equilibrium time of 72 h (Zhu et al 2009). Biocharbased ZVI nanoparticles can be prepared from Cassia fistula pods through pyrolysis, with maximum As(III) and As(V) adsorption capacities of 1.04 mg g -1 and 1.40 mg g -1 , respectively (Shaikh et al 2020). Comparing different nanoparticles, nanoscale TiO 2 supported by biochar has shown the highest efficacy (118 mg g -1 ) for removing As from contaminated water.…”

Section: Importance Of Nanoparticlesmentioning

confidence: 99%

Arsenic removal from water and soils using pristine and modified biochars

Zhang

Cho

Vithanage

et al. 2022

Biochar

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Arsenic (As) is recognized as a persistent and toxic contaminant in the environment that is harmful to humans. Biochar, a porous carbonaceous material with tunable functionality, has been used widely as an adsorbent for remediating As-contaminated water and soils. Several types of pristine and modified biochar are available, and significant efforts have been made toward modifying the surface of biochars to increase their adsorption capacity for As. Adsorption capacity is influenced by multiple factors, including biomass pyrolysis temperature, pH, the presence of dissolved organic carbon, surface charge, and the presence of phosphate, silicate, sulfate, and microbial activity. Improved As adsorption in modified biochars is attributed to several mechanisms including surface complexation/precipitation, ion exchange, oxidation, reduction, electrostatic interactions, and surface functional groups that have a relatively higher affinity for As. Modified biochars show promise for As adsorption; however, further research is required to improve the performance of these materials. For example, modified biochars must be eco-friendly, cost-effective, reliable, efficient, and sustainable to ensure their widespread application for immobilizing As in contaminated water and soils. Conducting relevant research to address these issues relies on a thorough understanding of biochar modifications to date. This study presents an in-depth review of pristine and modified biochars, including their production, physicochemical properties, and As adsorption mechanisms. Furthermore, a comprehensive evaluation of biochar applications is provided in As-contaminated environments as a guide for selecting suitable biochars for As removal in the field. Graphical Abstract

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Section: Importance Of Nanoparticlesmentioning

confidence: 99%

Arsenic removal from water and soils using pristine and modified biochars

Zhang

Cho

Vithanage

et al. 2022

Biochar

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“…In a study, pine cone biochar removed (66.08 ± 3.94 and 87.62 ± 3.88 %) As(III) ions (Van Vinh et al., 2015). The Cassia fistula‐ based biochar removed arsenic ions @ 1.40 mg/g (Shaikh et al., 2020). The iron‐loaded Douglas fir biochar maximum sorption capacity for As(III) was found to be 5.49 mg/g (Navarathna et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Sorptive removal of aqueous arsenite and arsenate ions onto a low cost, calcium modified Moringa oleifera wood biochar (CaMBC)

Prasad

Dave

Maurya

et al. 2021

Environmental Quality Management

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Arsenicosis, due to consumption of an elevated amount of arsenic‐containing groundwater is a serious issue related to human health. The ubiquitous nature of arsenic is also a part of agricultural soil solution and its uptake by edible plants imposes a considerable human health risk. A calcium pretreated wood of Moringa oleifera was pyrolyzed and converted into biochar. The resultant biochar was examined for arsenite and arsenate uptake from an aqueous solution. Further, characterization of biochar was performed using Fourier transformed infrared spectroscopy (FT‐IR) and Scanning electron microscope with energy dispersive x‐ray (SEM‐EDAX) analysis. Results suggested the involvement of different functional groups of calcium‐modified biochar in As(III) and As(V) sorption processes. Experimental data of batch sorption revealed that CaMBC could adsorb analyte ions from pH 5.0 to 7.0 with maximum percentage removal, that is, 87.27 and 94.52% at adsorbent concentration 2 g/L. A high loading capacity of prepared adsorbent was found to be 37.22 mg/g for arsenate and 33.44 mg/g for arsenite ions. The sorption occurred due to chemical interaction between functional group and arsenic ions, which existed over the surface of prepared biochar. The spontaneous sorption makes a CaMBC, an ideal candidate for the removal of dissolved arsenite, arsenate ions.

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