Effect of humic acid-loaded biochar on the adsorption performance of Mn2+ in soil leachate from mining area

Zeyu DAI; Jianlin ZHOU; Weiyin LIU; Ping QIN; Rong CHEN; Zhang CHEN; Zhixian LI; Guoliang CHEN

doi:10.13225/j.cnki.jccs.2024.0216

Meitan xuebao (Sep 2024)

Effect of humic acid-loaded biochar on the adsorption performance of Mn2+ in soil leachate from mining area

Zeyu DAI,
Jianlin ZHOU,
Weiyin LIU,
Ping QIN,
Rong CHEN,
Zhang CHEN,
Zhixian LI,
Guoliang CHEN

Affiliations

Zeyu DAI: College of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan　411201, China
Jianlin ZHOU: College of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan　411201, China
Weiyin LIU: College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan　411201, China
Ping QIN: College of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan　411201, China
Rong CHEN: College of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan　411201, China
Zhang CHEN: College of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan　411201, China
Zhixian LI: College of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan　411201, China
Guoliang CHEN: College of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan　411201, China

DOI: https://doi.org/10.13225/j.cnki.jccs.2024.0216
Journal volume & issue: Vol. 49, no. 9
pp. 4006 – 4018

Abstract

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Humic acid modified biochar (CSB-HA) was prepared using corn stover-based biochar (CSB) loaded with humic acid for the adsorption of Mn2+ from the soil leachate in the mining area and its adsorption characteristics were analyzed. With the help of SEM, BET, XRD, XPS and FT-IR, the prepared samples were characterized and analyzed. The results show that the specific surface area of CSB-HA is 7.911 m2/g, which is 1.98 times that of CSB, and the pores are mostly mesoporous. The excellent pore structure provides a large number of adsorption sites and promotes the contact with pollutants, so that the adsorption performance is enhanced. The surface of CSB-HA is enriched with the oxygen-containing functional groups such as C=O, O=C—O and —COOH, and the oxygen atoms in the functional groups can be complexed and coordinated with heavy metal ions to form a stable ligand bond, thus removing Mn2+. The maximum adsorption of Mn2+ by CSB-HA is 21.493 mg/g, and the quasi-primary kinetic model, quasi-secondary kinetic model, Langmuir isotherm and Temkin isotherm can fit the adsorption process well, and the Temkin constant bkid2=0.287), and the fitted lines do not pass through the origin, so that the intra-particle diffusion stage is the key stage of the adsorption process for controlling the rate. In the thermodynamic simulations, the separation coefficients RL are in the range of 0.4−0.6, ΔH=15.41 kJ/mol>0, and ΔG is negative and decreases with increasing temperature, indicating that the adsorption process is reversible and spontaneous heat absorption, and the adsorption reaction can be facilitated by warming up. ΔS=49.90 J/(mol·K)>0, which proves that the solid-liquid interface stoichiometry increases during the adsorption process. The simulated adsorption experiments on leaching solution show that CSB-HA has a good adsorption effect on Mn2+ and a regulating effect on the pH of leaching solution.

Published in Meitan xuebao

ISSN: 0253-9993 (Print)
Publisher: Editorial Office of Journal of China Coal Society
Country of publisher: China
LCC subjects: Science: Geology; Technology: Mining engineering. Metallurgy
Website: http://www.mtxb.com.cn/indexen.htm

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