College of Environmental Science and Engineering, and Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, 541004, China.
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin, 541004, China.
Environ Sci Pollut Res Int. 2024 Jan;31(4):5116-5131. doi: 10.1007/s11356-023-31544-y. Epub 2023 Dec 19.
Atrazine, a widely used herbicide in agriculture, is detrimental to both the ecological environment and human health owing to its extensive use, poor degradability, and biotoxicity. The technology commonly used to remove atrazine from water is activated carbon adsorption, but it has the problems of difficult recovery, secondary contamination, and a low removal rate. To efficiently remove atrazine from agricultural wastewater, in this study, a new environmental material, embedding immobilization (EI)-Co- and Zr-modified activated carbon powder (Co/Zr@AC), was prepared by immobilizing the bimetallic Co/Zr@AC via EI technique and employed to remove atrazine. When preparing EI-Co/Zr@AC, the single-factor experiment was conducted and determined the optimal preparation conditions: sodium alginate 2.5% (wt), calcium chloride 4.0% (wt), Co/Zr@AC 1.0% (wt), and bentonite 2.0% (wt). The prepared EI-Co/Zr@AC has a three-dimensional mesh structure and many pores and also possesses good mass transfer performance and mechanical properties. The removal efficiency by EI-Co/Zr@AC for the removal of 5.0 mg/L atrazine from 50 mL was 94.1% at pH 7.0 and 25°C, with an EI-Co/Zr@AC dosage of 0.8 g. The mechanistic study showed that the pseudo-second-order kinetic model could describe the removal process better than the pseudo-first-order kinetic model, and the Freundlich isotherm model fit better than other isotherm models. Additionally, the synthesized EI-Co/Zr@AC spheres demonstrated good reusability, with the atrazine removal rate remaining 70.4% after five cycles, and the mechanical properties of the spheres were stable.
莠去津是一种广泛应用于农业的除草剂，由于其广泛使用、降解性差和生物毒性，对生态环境和人类健康都有危害。从水中去除莠去津常用的技术是活性炭吸附，但存在回收困难、二次污染和去除率低等问题。为了有效去除农业废水中的莠去津，本研究通过嵌入固定化（EI）技术制备了一种新型环境材料，即共掺杂 Co 和 Zr 的改性活性炭粉末（Co/Zr@AC），并将其用于去除莠去津。在制备 EI-Co/Zr@AC 时，进行了单因素实验，确定了最佳的制备条件：海藻酸钠 2.5%（wt）、氯化钙 4.0%（wt）、Co/Zr@AC 1.0%（wt）和膨润土 2.0%（wt）。制备的 EI-Co/Zr@AC 具有三维网状结构和许多孔，具有良好的传质性能和机械性能。在 pH 值为 7.0 和 25°C 时，EI-Co/Zr@AC 用量为 0.8 g，可将 50 mL 中浓度为 5.0 mg/L 的莠去津去除 94.1%。机理研究表明，准二级动力学模型比准一级动力学模型更能描述去除过程，Freundlich 等温模型比其他等温模型更适合。此外，合成的 EI-Co/Zr@AC 球具有良好的可重复使用性，经过五个循环后，莠去津去除率仍保持在 70.4%，且球的机械性能稳定。
