Highly efficient photodegradation of RhB–MO mixture dye wastewater by Ag3PO4 dodecahedrons under acidic condition
Highly efficient photodegradation of RhB–MO mixture dye wastewater by Ag3PO4 dodecahedrons under acidic condition
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DOI：
10.1016/j.molcata.2014.06.026
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发表时间：
2014-11
影响因子：
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通讯作者：
Wang Kai;Wang Kai;Xu Juan;Xia Hua;Na Li;Mindong Chen;F. Teng;Yongfa Zhu;W. Yao
中科院分区：
文献类型：
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作者：
Wang Kai;Wang Kai;Xu Juan;Xia Hua;Na Li;Mindong Chen;F. Teng;Yongfa Zhu;W. Yao
采用简单沉淀法合成了Ag 3 PO 4十二面体，并在室温下研究了其对罗丹明B（RhB）、甲基橙子（MO）及其混合溶液在不同pH值下的光降解作用。采用X射线衍射（XRD）、扫描电镜（SEM）和紫外-可见漫反射光谱（UV-DRS）对样品进行了表征。通过加入二甲基亚砜（DMSO）作为·OH清除剂的对比实验，证实了酸的加入有利于·OH自由基的生成。结果表明，酸性条件下对RhB、MO及其混合染料的降解效率高于碱性和中性条件。此外，Ag 3 PO 4十二面体对RhB-MO混合染料溶液也表现出较高的可见光降解活性，其中MO的降解效率明显上级RhB.这一工作有望使MEMS技术的实际应用迈出一大步。
We report the photodegradation of rhodamine B (RhB), methyl orange (MO) and their mixture solutions at different pH values by the Ag3PO4dodecahedrons, which are synthesized by a simple precipitation method at room temperature. The samples are characterized by X-ray diffraction spectra (XRD), scanning electron microscope (SEM) and UV–vis diffuse-reflection spectra (UV-DRS). The contrast experiments, in which dimethyl sulfoxide (DMSO) is added as the scavenger of ·OH, confirm that the addition of acid favors the formation of more ·OH free radicals. As a result, the higher degradation efficiency can be achieved under acidic condition than under alkaline and neutral conditions for RhB, MO and their mixture dyes. Furthermore, the Ag3PO4dodecahedrons also show a high visible-light degradation activity for the RhB–MO mixture dye solution, in which the degradation efficiency of MO is significantly superior to that of RhB. This work could be expected to make a big step toward the practical application of photocatalysis technology.