School of Chemistry and Chemical Engineering, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, China.
School of Chemistry and Chemical Engineering, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, China.
Sci Total Environ. 2021 Mar 10;759:143542. doi: 10.1016/j.scitotenv.2020.143542. Epub 2020 Nov 6.
Herein, a novel Zn-loaded biochar (Zn-LBC) originating from Fraxinus pennsylvanica Marsh leaves was successfully prepared through a simple and rapid self-propagating combustion reaction (SHS) and could serve as an efficient adsorbent for tetracycline (TC) elimination from water. The adsorption performance was analyzed via a series of characterizations and batch adsorption experiments. The results showed that the novel adsorbent Zn-LBC exhibited an excellent TC adsorption capacity (159.64 mg/g), which was 2.63 times higher than that of the original biochar (60.78 mg/g). The pseudo-second-order kinetic model and Freundlich isothermal model fit the adsorption data well. It is noteworthy that Zn-LBC had little effect on the adsorption capacity of TC in the 0-10 mg/L various coexisting ion range and presence of humic acid (HA). In addition, the adsorption test of TC using hospital wastewater as the water sample also achieved satisfactory results (raw influent: 52.65 mg/g, final effluent: 85.64 mg/g). FT-IR and XPS investigations showed that the TC adsorption mechanism included surface complexation, π-π interactions, and hydrogen bonds. The results provide new ideas for exploring low-cost and highly efficient modified biochar adsorbent for TC elimination.
在此，通过简单快速的自蔓延燃烧反应（SHS）成功制备了一种新型的负载锌的生物炭（Zn-LBC），它可以作为一种从水中去除四环素（TC）的高效吸附剂。通过一系列的特性分析和批量吸附实验来分析吸附性能。结果表明，新型吸附剂 Zn-LBC 表现出优异的 TC 吸附能力（159.64mg/g），是原始生物炭（60.78mg/g）的 2.63 倍。准二级动力学模型和 Freundlich 等温模型很好地拟合了吸附数据。值得注意的是，Zn-LBC 对 0-10mg/L 各种共存离子范围和腐殖酸（HA）存在下 TC 的吸附容量影响不大。此外，使用医院废水作为水样进行 TC 吸附测试也取得了令人满意的结果（原水进水：52.65mg/g，最终出水：85.64mg/g）。FT-IR 和 XPS 研究表明，TC 的吸附机制包括表面络合、π-π 相互作用和氢键。这些结果为探索用于去除 TC 的低成本、高效的改性生物炭吸附剂提供了新的思路。
