Enhanced adsorptive removal of carbendazim from water by FeCl3-modified corn straw biochar as compared with pristine, HCl and NaOH modification
Enhanced adsorptive removal of carbendazim from water by FeCl3-modified corn straw biochar as compared with pristine, HCl and NaOH modification
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DOI：
10.1016/j.jece.2021.107024
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发表时间：
2021-12
影响因子：
7.7
通讯作者：
Yanru Wang;Jingbo Miao;M. Saleem;Yong Yang;Qingming Zhang
中科院分区：
文献类型：
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作者：
Yanru Wang;Jingbo Miao;M. Saleem;Yong Yang;Qingming Zhang
多菌灵在世界范围内的水体中广泛存在，对水体生态系统和人类健康构成潜在的风险。因此，有必要开发环保的方法来消除其在受污染的水环境中的残留。本文中，玉米秸秆生物炭是在300 ° C（BC 300）、500 ° C（BC 500）和700 ° C（BC 700）下制备的。以BC700为前驱体，分别合成了酸、碱、铁磁化改性生物炭（BC700H、BC700N、BC700M），并将其用于吸附去除水中多菌灵。结果表明，6种生物炭材料对多菌灵的吸附能力大小顺序为：BC700 M> BC700 H> BC700 N> BC700> BC500> BC300。BC700M的最大吸附量达到108.1 mg g − 1。生物炭材料对多菌灵的吸附是一个自发的、吸热的、随机递增的过程，吸附过程既有物理吸附又有化学吸附。BC700M的主要作用机制为孔隙填充、π-π作用、含氧基团和Fe-O络合作用。BC700M在较宽的pH范围内可以很容易地分离和再生至少5次。与其他5种生物炭材料相比，铁改性玉米秸秆生物炭是一种具有良好应用前景的可持续吸附剂。
Carbendazim residues were widely present in the worldwide water which caused a potential risk to water ecosystem and human health. Therefore, it is necessary to develop environmentally friendly ways to eliminate its residue in the contaminated water environments. Herein, the corn straw biochars were prepared at 300 (BC300), 500 (BC500), and 700 °C (BC700). Moreover, using BC700 as precursor, three novel adsorbents of acid, alkali, and iron magnetization modified biochar (named as BC700H, BC700N, and BC700M, respectively) were synthesized to adsorptive removal of carbendazim from water. Results showed that the adsorption capacity of six biochar materials for carbendazim was in the following order BC700M>BC700H>BC700N>BC700 >BC500 >BC300. The maximum adsorption amount of BC700M reached up to 108.1 mg g−1. The adsorption of carbendazim was a spontaneous, endothermic, and randomly increasing process, while both physisorption and chemisorption were involved in adsorption process for all prepared biochar materials. For BC700M, pore filling, π-π interaction, oxygen-containing groups, and Fe-O complexation were main mechanisms. The BC700M can be easily separated and regenerated at least five times under a wide pH range. Overall, as compared to the other five biochar materials, this study indicates that Fe-modified corn straw biochar is a promising and sustainable adsorbent for carbendazim removal from water environment.