Removal of Crotamiton from Reverse Osmosis Concentrate by a TiO2/Zeolite Composite Sheet
Removal of Crotamiton from Reverse Osmosis Concentrate by a TiO2/Zeolite Composite Sheet
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DOI：
10.3390/app7080778
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发表时间：
2017-07
期刊：
影响因子：
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通讯作者：
Q. Xiang;S. Fukahori;N. Yamashita;Hiroaki Tanaka;T. Fujiwara
中科院分区：
文献类型：
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作者：
Q. Xiang;S. Fukahori;N. Yamashita;Hiroaki Tanaka;T. Fujiwara
来自废水再利用设施的反渗透（RO）浓缩物含有浓缩的新兴污染物，例如药物。本研究以二氧化钛（TiO 2）和沸石为原料，合成了一种纸状复合片，并利用该复合片对反渗透浓缩液中的抗膨润土剂克罗米通进行了去除研究。RO浓缩液是从中试规模的城市二级出水回收厂获得的。将两种粉末有效地固定在片材中使得易于处理和将光催化剂和吸附剂从纯化水中分离。结果表明，TiO 2/沸石复合片对克罗米通具有良好的吸附性能，其它组分对克罗米通的吸附没有明显的抑制作用。在紫外光照射下，通过吸附和沉淀同时去除克罗米通。反渗透浓缩物中的克罗他米通的光催化分解在高初始克罗他米通浓度下被水基质显著抑制，而在低初始克罗他米通浓度下实现快速分解。主要的降解中间产物也被吸附的复合片。这一结果提供了一个有前途的方法来减轻在高级氧化过程中产生的有害中间体所造成的二次污染。HSZ-385/P25复合片的循环使用表明，连续去除反渗透浓缩液中的克罗米酮是可行的。
Reverse osmosis (RO) concentrate from wastewater reuse facilities contains concentrated emerging pollutants, such as pharmaceuticals. In this research, a paper-like composite sheet consisting of titanium dioxide (TiO2) and zeolite was synthesized, and removal of the antipruritic agent crotamiton from RO concentrate was studied using the TiO2/zeolite composite sheet. The RO concentrate was obtained from a pilot-scale municipal secondary effluent reclamation plant. Effective immobilization of the two powders in the sheet made it easy to handle and to separate the photocatalyst and adsorbent from purified water. The TiO2/zeolite composite sheet showed excellent performance for crotamiton adsorption without obvious inhibition by other components in the RO concentrate. With ultraviolet irradiation, crotamiton was simultaneously removed through adsorption and photocatalysis. The photocatalytic decomposition of crotamiton in the RO concentrate was significantly inhibited by the water matrix at high initial crotamiton concentrations, whereas rapid decomposition was achieved at low initial crotamiton concentrations. The major degradation intermediates were also adsorbed by the composite sheet. This result provides a promising method of mitigating secondary pollution caused by the harmful intermediates produced during advanced oxidation processes. The cyclic use of the HSZ-385/P25 composite sheet indicated the feasibility of continuously removing crotamiton from RO concentrate.