Adsorptive removal and photocatalytic decomposition of sulfamethazine in secondary effluent using TiO2–zeolite composites
Adsorptive removal and photocatalytic decomposition of sulfamethazine in secondary effluent using TiO2–zeolite composites
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DOI：
10.1007/s11356-013-1707-9
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发表时间：
2013
影响因子：
5.8
通讯作者：
Misaki Ito;S. Fukahori;T. Fujiwara
中科院分区：
文献类型：
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作者：
Misaki Ito;S. Fukahori;T. Fujiwara
研究了高硅Y型沸石（HSZ-385）、二氧化钛（TiO 2）及TiO 2-沸石复合材料对磺胺二甲嘧啶（SMT）的吸附和降解。以超纯水和二级出水为溶剂，制备了10 μg/L和10 mg/L的SMT溶液，并进行了吸附和光催化降解实验。以HSZ-385为吸附剂，对二级出水中的SMT进行了快速吸附，并在10 min内达到吸附平衡。TiO 2在二级出水中的光催化降解率低于在超纯水中的光催化降解率，说明二级出水中的离子和有机物对反应的抑制作用。我们合成了TiO 2-沸石复合材料，并将其应用于SMT的去除。在处理10 μg/LSMT的二级出水过程中，76%和99%以上的SMT在2和4 h内被降解。SMT被选择性地吸附到复合材料中的高硅Y型沸石上。结果表明，与单独使用TiO 2相比，复合材料对二级出水中SMT的去除效果更好。
We investigated the adsorption and decomposition of sulfamethazine (SMT), which is used as a synthetic antibacterial agent and discharged into environmental water, using high-silica Y-type zeolite (HSZ-385), titanium dioxide (TiO2), and TiO2–zeolite composites. By using ultrapure water and secondary effluent as solvents, we prepared SMT solutions (10 μg/L and 10 mg/L) and used them for adsorption and photocatalytic decomposition experiments. When HSZ-385 was used as an adsorbent, rapid adsorption of SMT in the secondary effluent was confirmed, and the adsorption reached equilibrium within 10 min. The photocatalytic decomposition rate using TiO2in the secondary effluent was lower than that in ultrapure water, and we clarified the inhibitory effect of ions and organic matter contained in the secondary effluent on the reaction. We synthesized TiO2–zeolite composites and applied them to the removal of SMT. During the treatment of 10 μg/L SMT in the secondary effluent using the composites, 76 % and more than 99 % of the SMT were decomposed within 2 and 4 h by photocatalysis. The SMT was selectively adsorbed onto high-silica Y-type zeolite in the composites. Resultantly, the inhibitory effect of the coexisting materials was reduced, and the composites could remove SMT more effectively compared with TiO2alone in the secondary effluent.