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首页> 外文会议>Frontiers on Separation Science and Technology >RESEARCH ON THE PHOTOCATALYTIC REMOVAL OF N-BUTYL AND ISOBUTYL XANTHATES IN THE TIO_2 SUSPENSION SYSTEM
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RESEARCH ON THE PHOTOCATALYTIC REMOVAL OF N-BUTYL AND ISOBUTYL XANTHATES IN THE TIO_2 SUSPENSION SYSTEM

机译：TIO_2悬浮体系中光催化去除N-丁基和异丁基黄酸酯的研究。

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Xanthates are widely used as the collector in the flotation of sulphide ores, and the concentration of xanthates in tailings can be up to 1.0ppm, which is toxic to the aquatic fauna. The degradation behaviors of n-butyl and isobutyl xanthates have been studied by using photo-catalysis in the TiO_2 suspension under the illumination of UV light in this paper. Addition of TiO_2, pH values, illumination time of UV light and initial concentrations of xanthate have been tested in the experiment. The results show that isobutyl xanthate is easier to degrade than that of n-butyl xanthate, and the optimum addition of TiO_2 is 0.1g·l~(-1) for isobutyl xanthate and 0.2g·l~(-1) for n-butyl xanthate respectively. The change trends of degradation rate for both xanthates at different pH values are similar, i.e., both are decreased with the increase of pH values when pH < 8.5 because of the reduction of xanthate absorbance on the TiO_2 surface, then the degradation rates start to increase when pH > 8.5 due to more hydroxyl radicals (·OH) presence in alkaline aqueous solution. The results of kinetics research indicate that photo-catalytic degradation of both xanthates follows the pseudo-first order kinetics model. At lower initial concentrations, xanthates are easier to degrade by photo-catalysis. The UV wavelength scan in the process of photodegradation demonstrates that the intermediate product perxanthate (ROCS_2O~-) appears in the process of photo-catalytic degradation for isobutyl xanthate, while not any intermediate products appear for n-butyl xanthate. The presence of perxanthate may lower the energy required to break down xanthate molecules.
机译：黄原酸盐被广泛用作硫化矿石浮选的捕收剂，尾矿中黄原酸盐的浓度可高达1.0ppm，对水生动物有毒。本文研究了在紫外光下TiO_2悬浮液中光催化作用下黄原酸正丁酯和异丁基黄药的降解行为。实验中测试了TiO_2的添加，pH值，紫外线照射时间和黄药的初始浓度。结果表明，黄原酸异丁酯比黄原酸正丁酯更易于降解，TiO_2的最佳添加量为黄原酸异丁酯为0.1g·l〜（-1），n-黄原酸为0.2g·l〜（-1）。黄原酸丁酯。两种黄药在不同pH值下降解速率的变化趋势是相似的，即当pH <8.5时，由于TiO_2表面上黄药的吸收率降低，二者均随pH值的增加而降低，然后降解速率开始增加。当pH大于8.5时，由于碱性水溶液中存在更多的羟基（·OH）。动力学研究结果表明，两种黄药的光催化降解均遵循拟一级动力学模型。在较低的初始浓度下，黄药会更容易通过光催化降解。在光降解过程中的紫外波长扫描表明，中间产物黄原酸酯（ROCS_2O-）出现在黄原酸异丁酯的光催化降解过程中，而没有任何中间产物出现在黄原酸正丁酯中。黄药的存在会降低分解黄药分子所需的能量。

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