Nitrogen and magnesium codoped biochar activates periodate to remediate bensulfuron methyl-contaminated water at low temperature: Performance, mechanisms, and phytotoxicity,Journal of Hazardous Materials

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Nitrogen and magnesium codoped biochar activates periodate to remediate bensulfuron methyl-contaminated water at low temperature: Performance, mechanisms, and phytotoxicity
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-10 , DOI: 10.1016/j.jhazmat.2024.135803
Yang Yang ₁ , Zhichao Kang ₂ , Guanghui Xu ₁ , Yong Yu ₁

Affiliation

Bensulfuron methyl (BSM), a typical sulfonylurea herbicide, has been widely used worldwide for weed suppression and crop protection. Nevertheless, the long-term and prolonged usage led to residues in environment, resulting in the reduction of crop yields and even threatening food security. In this study, the nitrogen/magnesium codoped biochar (NMg-BC) was prepared via two-step pyrolysis method to activate periodate (PI) for BSM degradation. The results demonstrated BSM degradation rate was 87.9 % within 10 min by NMg-BC/PI system at 15 ℃. The system exhibited the favorable tolerance to environmental changes (pH, temperature, anions, and humic acids), presenting high removal efficiency of BSM. Radicals (IO3•) and non-radicals (1O2 and electron transfer) pathways contributed to the degradation of BSM, while the latter performed a crucial role in BSM degradation. Theoretical calculations further confirmed doped of N and Mg changed the electron configuration and electrostatic potential (ESP) distribution of biochar, which was beneficial to provide more active sites for PI activation. Hydroponic experiments showed that NMg-BC/PI system could effectively degrade BSM, and its residue had no significant effect on the length and weight of soybean. The study provides a promising approach for the pollutant remediation in cold regions.

中文翻译：

氮镁共掺杂生物炭在低温下激活高碘酸盐以修复甲基苯嘧磺隆污染的水：性能、机制和植物毒性

甲基苯嘧磺隆（BSM）是一种典型的磺酰脲类除草剂，在世界范围内已广泛用于除草和作物保护。然而，长期和长期使用会导致环境中的残留物，导致作物产量下降，甚至威胁粮食安全。在本研究中，通过两步热解法制备氮/镁共掺杂生物炭（NMg-BC），以激活高碘酸盐（PI）进行 BSM 降解。结果表明，在 15 °C 下，NMg-BC/PI 系统在 10 min 内 BSM 降解率为 87.9 %。该系统对环境变化（pH、温度、阴离子和腐殖酸）表现出良好的耐受性，表现出 BSM 的高去除效率。自由基（IO3•）和非自由基（1O2 和电子转移）途径有助于 BSM 的降解，而后者在 BSM 降解中起关键作用。理论计算进一步证实，掺杂 N 和 Mg 改变了生物炭的电子构型和静电电位（ESP）分布，有利于为 PI 活化提供更多活性位点。水培实验表明，NMg-BC/PI 体系能有效降解 BSM，其残留物对大豆的长度和重量无显著影响。该研究为寒冷地区的污染物修复提供了一种有前途的方法。

更新日期：2024-09-10

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