Liu Cheng, Chen Wei, Tao Hui, Lin Tao
Key Laboratory of Integrated Regulation and Resource Development Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China.
Huan Jing Ke Xue. 2009 Jun 15;30(6):1653-7.
Removal efficiency and influencing factors of bisphenol A by the combined process of solar irradiation and S-doped TiO2 were studied in detail, in which S-doped TiO2 photo-catalyst with high activity was prepared by acid catalyzed hydrolysis method using thiourea as sulfur source. Results showed that bisphenol A could be more effectively oxidized by the solar/S-doped TiO2 process than by solar/TiO2 process, whose removal effect were 79% and 49% after 30 min's irradiation, respectively. Pseudo-first-order model could be used to simulate the oxidation process in which the degradation rate coefficients were independent of the initial concentration of bisphenol A. Degradation rate could be greatly affected by the concentration of H2O2, and the optimum concentration for the system of solar/S-doped TiO2 was found to be 20 mg/L, which was 5 mg/L higher than that of solar/TiO2 system. Lower water pH favored the degradation of bisphenol A, whose degradation rate coefficients at pH 5.5 were about 50% higher than that at pH 8.5. Humic acids decreased both the degradation rate of the two processes, and the influence could be fitted by second-order equation. In addition, solar/S-doped TiO2 process was more easily affected, for the humic acids could not only compete with molecular bisphenol-A for radicals but also adsorb part of visible sunlight which can excite radical with TiO2.
详细研究了太阳能辐照与S掺杂TiO₂联合工艺对双酚A的去除效率及影响因素，其中以硫脲为硫源，通过酸催化水解法制备了高活性的S掺杂TiO₂光催化剂。结果表明，太阳能/S掺杂TiO₂工艺比太阳能/TiO₂工艺能更有效地氧化双酚A，辐照30 min后，其去除率分别为79%和49%。准一级模型可用于模拟氧化过程，其中降解速率系数与双酚A的初始浓度无关。降解速率受H₂O₂浓度影响较大，太阳能/S掺杂TiO₂体系的最佳浓度为20 mg/L，比太阳能/TiO₂体系高5 mg/L。较低的水pH值有利于双酚A的降解，pH 5.5时的降解速率系数比pH 8.5时高约50%。腐殖酸降低了两种工艺的降解速率，其影响可用二级方程拟合。此外，太阳能/S掺杂TiO₂工艺更容易受到影响，因为腐殖酸不仅能与双酚A分子竞争自由基，还能吸收部分可激发TiO₂产生自由基的可见光。
