Asenic removal from groundwater using granular chitosan-titanium adsorbent
Asenic removal from groundwater using granular chitosan-titanium adsorbent
复制标题
使用粒状壳聚糖-钛吸附剂去除地下水中的砷
DOI：
10.1016/j.jes.2021.05.028
复制
发表时间：
2022
影响因子：
6.9
通讯作者：
Chuanyong Jing
中科院分区：
文献类型：
--
作者：
Zuben Xu;Yaqin Yu;Li Yan;Wei Yan;Chuanyong Jing
砷污染构成了紧迫的环境风险，由于缺乏有效的吸附剂，从地下水中去除砷仍然是一个挑战。采用溶胶-凝胶法制备了一种新型颗粒状壳聚糖-钛(CS-Ti)吸附剂。批量实验表明，As(V)在CS-Ti上的吸附符合拟二级动力学模型，吸附等温线符合Freundlich模型，相关系数为0.99。原位红外光谱分析表明，CS-Ti吸附剂是由壳聚糖和无定形TiOx通过形成C-O-Ti键和N-Ti键组成的，无定形TiOx负责吸附As(V)。快速小柱试验结果表明，在约126层体积内，地下水中砷的有效去除量为165.6 μg/L，在0.01 mol/L NaOH条件下，废吸附剂可再生，4个循环后仍能保持吸附效率。本研究为水处理吸附剂的制备提供了一条简单实用的途径。
Arsenic (As) contamination poses an urgent environmental risk, and its removal from groundwater remains a challenge due to the lack of efficient adsorbents. Herein, a novel granular chitosan-titanium (CS-Ti) adsorbent was fabricated by the sol-gel method. Batch experiments show that As(V) adsorption on CS-Ti followed the pseudo-second-order kinetic model, and the adsorption isotherm conformed to the Freundlich model with the correlation coefficient of 0.99.In situFTIR spectra revealed that the CS-Ti adsorbent was composed of amorphous TiOx and chitosan by forming C-O-Ti and N-Ti bonds, and the amorphous TiOx was responsible for As(V) adsorption. Rapid small-scale column tests show that 165.6 μg/L of As in groundwater were effectively removed in approximately 126-bed volumes, and the spent adsorbents were regenerated with 0.01 mol/L NaOH and maintained the adsorption efficiency after four cycles. This study provides a simple and practical route to fabricate adsorbents for water treatment.