Xianghu Laboratory, Hangzhou, 311231, China; 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.
Xianghu Laboratory, Hangzhou, 311231, China; State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Environment, Resource, Soil and Fertilizers, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China.
Chemosphere. 2024 Sep;363:142855. doi: 10.1016/j.chemosphere.2024.142855. Epub 2024 Jul 15.
This study aimed to design an efficient and easily collected/regenerated adsorbent for trace concentration sulfamethoxazole (SMX) removal to eliminate its negative impacts on human health, reduce the risk of adsorbed SMX release and boost the reusability of adsorbent. Various multiple modified sludge-derived biochars (SBC) were synthesized in this work and applied to adsorb trace level SMX. The results demonstrated that hydrothermal N-doping, magnetization coupled with ball milling co-functionalized SBC (BMNSBC) displayed the greater adsorption ability for SMX. The maximum adsorption capacity of BMNSBC for SMX calculated by Langmuir model was 1.02 × 10 μg/g, which was 12.9 times of SBC. Characterization combined with adsorption experiments (e.g., models fitting) and DFT calculation confirmed that π-π conjugation, Lewis acid-base, pore filling and FeO complexation were the primary forces driving SMX binding to BMNSBC. These diversified physicochemical forces contributed to the fine anti-interference of BMNSBC to background substances (e.g., inorganic compounds and organic matter) and its remarkable adsorption ability for SMX in diverse real waters. The great magnetization strength of BMNSBC was advantage for its collection and efficient regeneration by NaOH desorption. Additionally, BMNSBC exhibited an outstanding security in view of its low leaching levels of iron (Fe) and total nitrogen (TN). The multiple superiority of BMNSBC enable it to be a prospective material for emerging contaminants (e.g., SMX) purification, also offering a feasible disposal approach for municipal waste (e.g., sludge).
本研究旨在设计一种高效且易于采集/再生的吸附剂，用于去除痕量浓度的磺胺甲恶唑 (SMX)，以消除其对人类健康的负面影响，降低吸附 SMX 释放的风险，并提高吸附剂的可重复使用性。本工作合成了各种多元改性污泥衍生生物炭 (SBC)，并将其用于吸附痕量 SMX。结果表明，水热 N 掺杂、磁化耦合与球磨共功能化 SBC (BMNSBC) 对 SMX 具有更强的吸附能力。BMNSBC 对 SMX 的最大吸附容量由 Langmuir 模型计算为 1.02×10μg/g，是 SBC 的 12.9 倍。通过特征分析结合吸附实验（如模型拟合）和 DFT 计算证实，π-π 共轭、Lewis 酸碱、孔填充和 FeO 络合是驱动 SMX 与 BMNSBC 结合的主要作用力。这些多样化的物理化学作用力有助于 BMNSBC 对背景物质（如无机化合物和有机物）的良好抗干扰性和其在各种实际水体中对 SMX 的显著吸附能力。BMNSBC 具有较大的磁化强度，有利于通过 NaOH 解吸进行收集和高效再生。此外，BMNSBC 表现出较低的铁 (Fe) 和总氮 (TN) 浸出水平，具有较高的安全性。BMNSBC 的多重优势使其成为新兴污染物（如 SMX）净化的有前景的材料，也为城市废物（如污泥）提供了可行的处理方法。
