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首页> 外文期刊>Journal of Colloid and Interface Science >Photocatalytic degradation in aqueous solution using quantum-sized ZnO particles supported on sepiolite
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Photocatalytic degradation in aqueous solution using quantum-sized ZnO particles supported on sepiolite

机译：海泡石上负载的量子尺寸ZnO颗粒在水溶液中的光催化降解

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摘要

Quantum-sized ZnO particles supported on sepiolite (ZnO/sepiolite) was prepared by sol-gel method using the sepiolite of acid activation as carrier, zinc acetate dihydrate (Zn(CH_3COO)_2·2H_2O) and lithium hydroxide monohydrate (LiOH·H_2O) as raw material. The size of ZnO which supported on fibrous sepiolite is about 5nm when calcined at 200°C. The behavior of ZnO/sepiolite composites in the degradation of C.I. Reactive Blue 4 was investigated. Under the optimal preparation conditions, when the content of ZnO was about 70wt.% in the nanocomposites, the photocatalytic property of the ZnO/sepiolite was excellent. The degradation rate of 20mg/L C.I. Reactive Blue 4 could get to 98% in 120min at room temperature when the concentration of catalyst was 0.2g/L. The photocatalytic decomposition of organic pollutants accords with a pseudo first-order kinetic. The pH and H_2O_2 influence the degradation rate of the ZnO/sepiolite. The experiment indicated that after the catalyst had been used 5 times repeatedly, the degradation rate had been still above 80%.
机译：以酸活化海泡石为载体，醋酸锌二水合物（Zn（CH_3COO）_2·2H_2O）和氢氧化锂一水合物（LiOH·H_2O）通过溶胶-凝胶法制备了负载在海泡石上的量子尺寸ZnO颗粒（ZnO /海泡石）。作为原料。当在200°C下煅烧时，负载在海泡石纤维上的ZnO的尺寸约为5nm。 ZnO /海泡石复合材料在C.I.降解中的行为研究了活性蓝4。在最佳制备条件下，当纳米复合物中ZnO的含量约为70wt。％时，ZnO /海泡石的光催化性能优异。 20mg / L C.I.的降解率当催化剂浓度为0.2g / L时，室温下120min内活性蓝4可达98％。有机污染物的光催化分解符合拟一级动力学。 pH和H_2O_2影响ZnO /海泡石的降解速率。实验表明，催化剂重复使用5次后，降解率仍在80％以上。

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