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首页> 外文会议>International Conference on Separation Scinece 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悬浮系统中正丁基和异丁基黄原酸盐的光催化除去

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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：黄原酸酯被广泛用作在硫化物矿石的浮选的集电极，和黄原酸酯的尾矿中的浓度可高达1.0ppm的，这是有毒的水生动物。正丁基和异丁基黄原酸酯的降解行为进行了研究，通过使用UV光的本文中的照明下在悬浮液中的TiO_2光催化。的TiO_2的另外，pH值下，紫外光和黄原酸酯的初始浓度的照明时间已经在实验中被测试。结果表明，异丁基黄原酸是更容易比正丁基黄原酸降解，最佳的TiO_2加入的是0.1克·L〜（-1）异丁基黄原酸和0.2克·L〜（-1）为正丁基分别黄药。降解速率在不同的pH值都黄原酸酯的变化趋势是类似的，即，两个时，因为的TiO_2表面上黄药吸光度的减少的pH值<8.5，然后降解速率开始增加与pH值下的增加而减小当pH值> 8.5由于更多的羟基自由基（·OH）在碱性水溶液中存在。动力学的研究结果表明，这两种黄原酸盐是光催化降解遵循准一级动力学模型。在较低的初始浓度，黄原酸酯是通过光催化作用容易降解。在光降解的过程中UV波长扫描证实了中间产物perxanthate（ROCS_2O〜 - ）显示在对异丁基黄原酸的光催化降解的过程，而不是任何中间产物出现正丁基黄原酸酯。 perxanthate的存在可以降低能量需要打破黄药分子。

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