A mechanistic study on removal efficiency of neonicotinoids by biochars with various fabrication methods

文献类型： 外文期刊

第一作者： Yuan, Xian

作者： Yuan, Xian;Jiang, Wei;Shen, Xiaofang;Zhang, Haiyun

作者机构：

关键词： Neonicotinoid insecticides; Biochar; Modification; Adsorption

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.2； 五年影响因子：7.6 ）

ISSN： 2213-2929

年卷期： 2025 年 13 卷 3 期

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收录情况： SCI

摘要： Neonicotinoid insecticides (NNIs) are widely detected in the environment, and their removal has garnered nificant attention. Biochar is an efficient sorbent, but various fabrication processes affect its adsorption ciency, and the role of N-containing functional groups in NNI adsorption on biochar remains underexplored. this study, 48 biochars were synthesized using various raw materials (rice straws, Cinnamomum camphora branches, or shrimp shells), pyrolysis temperature (300, 450, 600, or 750 degrees C), and modification methods (pristine, NaOH, H3PO4, or urea). Adsorption results indicate that these three factors significantly influence removal efficiency of four NNIs (clothianidin, imidacloprid, nitenpyram, and thiamethoxam). Moreover, chars derived from rice straw and camphora branches at 750 degrees C exhibited significantly higher adsorption pacity than the others. Therefore, five biochars pyrolyzed at 750 degrees C were further analyzed, including four straw-based biochars (one pristine and three modified with NaOH, H3PO4 and urea), and one camphora branch-based biochar modified with urea. Although various modification methods significantly enhanced biochars' specific surface area and pore volume, these properties were not the dominant mechanisms governing NNI adsorption enhancement. However, the NNIs adsorption capacity was significantly correlated with pyrrolic N content of the five biochars, with urea-modified rice straw biochar (7-r-U) exhibiting the highest adsorption capacity and pyrrolic N content. DFT calculations revealed that pyrrolic N carried a significant higher negative charge than graphitic or pyridinic N, leading to a stronger hydrogen bonding and electrostatic interaction with NNIs. These findings are crucial for developing highly efficient sorbents for NNI removal.

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