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Efficient removal of Cd(II) from aqueous solution by pinecone biochar: Sorption performance and governing mechanisms TEXT SIZE: A A A
Cadmium (Cd) is one of the most harmful and widespread environmental pollutants. Despite decadeslong research efforts, the remediation of water contaminated by Cd has remained a significant challenge. A novel carbon material, pinecone biochar, was previously hypothesized to be a promising adsorbent for Cd, while so far, it has received little attention. This study evaluated the sorption capacity of pinecone biochar through isotherm experiments. Based on Langmuir model, the adsorption maximum for Cd(II) was up to 92.7 mg g(-1). The mechanism of Cd(II) adsorption on pinecone biochar was also explored through both thermodynamic and kinetics adsorption experiments, as well as both solution and solid-phase microstructure characterization. The solid-solution partitioning behaviour of Cd(II) fitted best with the T.th model while the adsorption process followed a pseudo-second-order rate, suggesting that the Cd(II) adsorption on the pinecone biochar was mainly a chemisorption process. Microstructure characteristics and mechanism analysis further suggested that coprecipitation and surface complexation were the main mechanisms of Cd adsorption by biochar. Coprecipitation occurred mainly through the forms of Cd(OH)(2) and CdCO3. Our results demonstrated that pinecone biochar was an efficient adsorbent which holds a huge potential for Cd(II) removal from aqueous solution. (C) 2020 Elsevier Ltd. All rights reserved.
 

Publication name

 ENVIRONMENTAL POLLUTION Volume: 265 Part: A Article Number: 115001 DOI: 10.1016/j.envpol.2020.115001 Published: OCT 2020

Author(s)

 Teng, Dongye; Zhang, Bingbing; Xu, Guomin; Wang, Bing; Mao, Kang; Wang, Jianxu; Sun, Jing; Feng, Xinbin; Yang, Zhugen; Zhang, Hua

Corresponding author(s) 

 ZHANG Hua 
 zhanghua@mail.gyig.ac.cn 
 Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China.

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