Enhanced adsorption performance of bensulfuron methyl with B doping biochar: Mechanism and density functional theory calculations

• DOI: 10.1016/j.biortech.2023.128657
• Publication Date: 2023-01-20T17:38:20Z
• Authors: Yang Yang; Zhichao Kang; Guanghui Xu; Yong Yu
• Keywords: Kinetics; Sulfonylurea Compounds; Charcoal; Oryza; Adsorption; Oxidants; 01 natural sciences; Density Functional Theory; Water Pollutants, Chemical; 0105 earth and related environmental sciences

It is an urgent task to develop suitable adsorbents for the control of herbicide-bensulfuron methyl (BSM) in the paddy rice fields at cold regions. Herein, B doping biochar was synthesized via one-step method. Results showed that the adsorption capacity for BSM on 1.0BBC was significantly superior to BC at 15 °C. Besides, low temperature resistance, wide pH adaptability, stable adsorption performance and reusability test suggested that 1.0BBC have potential practical application. The mechanisms of BSM removal by 1.0BBC were mainly attributed to pore filling and π-π electron donor-acceptor (EDA) interaction. Theoretical calculations revealed that BCO2 could enhance the adsorption capacity by π-π EDA between BSM and adsorbent. Meanwhile, hydroponic experiment demonstrated that the toxicity to soybean after adsorption of BSM by 1.0BBC was within the safe range. This study proves that 1.0BBC is an easy-to-prepare adsorbent with promising application in BSM removal in the rice paddy fields at lower temperature.