School of Chemistry and Environment, Yunnan Minzu University, Kunming, 650500, Yunnan, China.
School of College of Applied Technology, Yunnan Minzu University, Kunming, 650500, Yunnan, China.
Chemosphere. 2022 Jan;287(Pt 1):132118. doi: 10.1016/j.chemosphere.2021.132118. Epub 2021 Aug 31.
Zr/CTAB/BAC was prepared by bamboo activated carbon (BAC) functionalised by zirconia chloride octahydrate (ZrOCl·8HO) and Cetyltrimethylammonium bromide (CTAB). The effects of temperature, time, Zr dosage and CTAB concentration on removing phosphate and nitrate (HPO and NO) in wastewater were investigated. The structure of Zr/CTAB/BAC was characterized by SEM, BET, FTIR, XRD and TG, and the kinetics and thermodynamics of adsorption were discussed. The optimum preparation conditions were as follows: the modification temperature was 25 °C, the modification time was 4 h, the mass of the modifier Zr added was 0.40 g, and the concentration of the modifier CTAB was 0.6 mM. When the dosage of Zr/CTAB/BAC was in the range of 0.1 g-1.0 g, the removal efficiency of phosphate in simulated wastewater was between 59.32% and 99.42%, and the removal efficiency of nitrate was between 34.08% and 93.70%. Using NaOH as a regenerant, after four times adsorption and desorption experiments, the removal efficiency of phosphate and nitrate by Zr/CTAB/BAC can still reach more than 70%. The chemical adsorption was the primary cause of the adsorption, and the adsorption process was endothermic. Zr/CTAB/BAC had an obvious removal effect on phosphate and nitrate in water, which could be promoted to treat other anionic salts in sewage.
Zr/CTAB/BAC 通过竹炭（BAC）负载八水氧氯化锆（ZrOCl·8HO）和十六烷基三甲基溴化铵（CTAB）制备而成。考察了温度、时间、Zr 用量和 CTAB 浓度对废水除磷和除硝酸盐（HPO 和 NO）的影响。采用 SEM、BET、FTIR、XRD 和 TG 对 Zr/CTAB/BAC 的结构进行了表征，并讨论了吸附的动力学和热力学。最佳制备条件为：改性温度 25℃，改性时间 4 h，加入的改性剂 Zr 质量为 0.40 g，改性剂 CTAB 的浓度为 0.6 mM。当 Zr/CTAB/BAC 的用量在 0.1 g-1.0 g 范围内时，模拟废水中磷酸盐的去除率在 59.32%-99.42%之间，硝酸盐的去除率在 34.08%-93.70%之间。采用 NaOH 作为再生剂，经过 4 次吸附和解吸实验后，Zr/CTAB/BAC 对磷酸盐和硝酸盐的去除率仍能达到 70%以上。化学吸附是吸附的主要原因，吸附过程是吸热的。Zr/CTAB/BAC 对水中的磷酸盐和硝酸盐具有明显的去除效果，可推广用于处理污水中的其他阴离子盐。
