Removal of Arsenic by Wheat Straw Biochar from Soil

• Published in: Bulletin of environmental contamination and toxicology Vol. 108; no. 3; pp. 415 - 422
• Main Authors: Kumar, Abhishek, Bhattacharya, Tanushree
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.03.2022; Springer Nature B.V
• Subjects: Adsorption; Aquatic Pollution; Arsenic; Arsenic removal; biochar; Charcoal; Chemisorption; Earth and Environmental Science; Ecotoxicology; Emission analysis; Environment; Environmental Chemistry; Environmental Health; Feasibility studies; Field emission microscopy; Functional groups; Infrared imaging; Ion exchange; Pollutant removal; Pollution; Pyrolysis; Scanning electron microscopy; Soil; Soil Science & Conservation; soil treatment; Soils; Sorption; Stability analysis; Straw; surface area; Surface stability; Thermal imaging; thermodynamics; toxicology; Triticum; Triticum aestivum; Waste Water Technology; Water Management; Water Pollution Control; Wheat; Wheat straw; Sorption; Remediation; Arsenic; Biochar
• ISSN: 0007-4861; 1432-0800; 1432-0800
• DOI: 10.1007/s00128-020-03095-2

Biochar prepared from wheat straw ( Triticum aestivum ) at different pyrolysis temperatures was screened, followed by its application to soil for arsenic removal in the present study. Characterization of biochar by Field emission scanning electron microscope studies and Fourier thermal Infrared imaging showed smooth and porous biochar surface and abundance of surface functional groups. A low value of H/C was obtained by CHNS analyzer, indicating high stability of biochar. The surface area was 15.86 m 2 /g on an average. Batch sorption experiments were carried out to optimize conditions for arsenic sorption. Maximum arsenic removal of 83.7% was obtained when applied at a 7.5% dose for a contact time of 60 min at 25 °C. Isotherm, kinetic and thermodynamic studies revealed the feasibility of sorption and removal of arsenic through physisorption, chemisorption, ion exchange, and diffusion.