Hubei Key Laboratory of Mineral Resources Processing and Environment, School of Resources and Environmental Engineering, State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China.
China-UK Water and Soil Resources Sustainable Utilization Joint Research Centre, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, 453002, China.
Chemosphere. 2022 Mar;291(Pt 1):132707. doi: 10.1016/j.chemosphere.2021.132707. Epub 2021 Oct 25.
The extensive use of imidacloprid (IMI) has led to its being frequently detected in natural water, also caused the potential damage to the ecosystem. Development of efficient, green and sustainable technique is demanded to eliminate this problem. A novel biochar (KMCBC) derived from agriculture waste of corn cob was first time co-modified by potassium hydroxide (KOH), ferric chloride (FeCl) and zinc chloride (ZnCl), which showed the greater adsorption amount (410 mg g at 298 K) for imidacloprid (IMI). Pseudo-second-order kinetic and Langmuir isotherm models fitted well with the experimental data, together with the physicochemical characterization analysis, demonstrating that the adsorption process of IMI by KMCBC might be mainly controlled by micropore filling, π-π electron donor-acceptor and functional groups interactions (H-bonding and complexation). Additionally, the thermodynamics parameters suggested that IMI adsorption in this study was a spontaneous, endothermic and randomly increasing process. Besides, KMCBC owned the easy separation performance and promising environmental safety, also exhibited a high selective adsorption capacity regardless of solution pH (its optimum adsorption performance for IMI was obtained at pH = 5), inorganic ions strength and humic acid (HA) concentrations. The regenerated KMCBC (synergistic ultrasound/ethanol) could sustainably and efficiently adsorb IMI in the reuse cycles. Therefore, this study provided an efficient, green and sustainable adsorbent of KMCBC for IMI removal.
广泛使用吡虫啉（IMI）导致其在天然水中频繁被检测到，也对生态系统造成潜在的损害。因此需要开发高效、绿色和可持续的技术来解决这个问题。首次使用玉米芯农业废弃物制备了一种新型生物炭（KMCBC），并用氢氧化钾（KOH）、氯化铁（FeCl）和氯化锌（ZnCl）进行了共改性，其对吡虫啉（IMI）的吸附量（298 K 时为 410 mg g）较大。准二级动力学和 Langmuir 等温线模型很好地拟合了实验数据，结合物理化学特性分析，表明 KMCBC 对 IMI 的吸附过程可能主要受微孔填充、π-π电子供体-受体和官能团相互作用（氢键和络合）的控制。此外，热力学参数表明，本研究中的 IMI 吸附是一个自发的、吸热的和随机增加的过程。此外，KMCBC 具有易于分离的性能和良好的环境安全性，并且表现出高选择性的吸附能力，不受溶液 pH 值（在 pH = 5 时对 IMI 的最佳吸附性能）、无机离子强度和腐殖酸（HA）浓度的影响。再生的 KMCBC（协同超声/乙醇）可在重复使用循环中可持续、有效地吸附 IMI。因此，本研究为去除 IMI 提供了一种高效、绿色和可持续的 KMCBC 吸附剂。
