模拟阳光下Ag／I-TiO2光催化预处理山核桃加工废水

研究了在模拟太阳光下，采用银修饰的碘掺杂二氧化钛光催化剂（Ag／I—TiO2）对某食品厂山核桃加工废水进行光催化预处理的效果。结合x射线衍射（XRD）、比表面积分析（BET）、紫外-可见漫反射光谱（uV—Vis）的表征结果，来分析催化剂结构对于废水处理效果的影响。探讨了Ag含量、废水初始pH（pHi）和光照时间等因素对化学需氧量（COD）去除及水质可生化性（B／C）提高的影响。并得出适宜的反应参数为：3％Ag含量；pHi为6；光照时间为240min。在最佳条件下，COD去除率45％，废水B／C比由0．17上升到0．31。光催化氧化法能够有效降低山核桃加工废水的COD含量，并达到显著提高废水可生化性的目的。

Pretreatment of wastewater from hickory nut manufacture used Ag/I-TiO2 under simulated solar light illumination

The effluent from the hickory nut manufacturing process was subjected to photocatalysis pretreat- ment with iodine-doped titania modified with silver （Ag/I-TiO2 ） in artificial solar energy. In this study, the influ- ence of catalyst properties was analyzed by X-ray diffraction （XRD）, Brunauer-Emmett-Teller （BET） and UV diffused reflectance spectra （UV）. Moreover,the dosage of Ag ＋ ion, the initial pH of wastewater （pHi）, and the exposure time （t） were tested for optimizing the operation parameters. The results show that the removal rate of COD was up to 45% ,and the ratio of B/C increased from 0.17 to 0.31 under the optimum conditions of 3% Ag dosage,pHi = 6 and t = 240 rain. This clearly indicates that photocatalysis for pretreatment of hickory nut manu- facturing wastewater is effective in reducing the content of COD while enhancing its biodegradability.