可见光响应光催化降解甲基红溶液  

Study of Visible Response to Photocatalytic Degradation of Methyl Red Solution

作　　者：朱秀华[1] 万全利[1] 王炜[1] 穆军[1] 于洪全[1] 彭孝军[2] 张蓉[2] 

机构地区：[1]大连交通大学环境与化学工程学院辽宁省高等学校环境科学与技术重点实验室,辽宁大连116028 [2]大连理工大学精细化工国家重点实验室,辽宁大连116012

出　　处：《大连交通大学学报》2010年第5期53-56,共4页Journal of Dalian Jiaotong University

基　　金：大连理工大学精细化工国家重点实验室开放课题基金资助项目(KF0707);辽宁省高校重点实验室支持计划资助项目(LS2010031)

摘　　要：合成了多金属氧酸盐(K6SiW11O39SnⅡ),并以室内散光和日光为光源,研究了其对模拟染料废水甲基红溶液的光催化脱色降解性.结果表明,甲基红溶液的初始浓度、催化剂投加量、光解时间及光源对其光解效果均有影响.甲基红溶液的初始浓度为10 mg/L,溶液初始pH为4,催化剂浓度为1 g/L时,在平均光照强度为3 000 lx室内散光下,光照6 h,其脱色率达98%以上,TOC去除率84.2%、COD去除率89.6%;采用化学自组装法制备了K6SiW11O39SnⅡ-聚乙烯醇(SiW11SnⅡ/PVA)复合膜,达到上述同等效果需要12 h;在平均光照强度为78 000 lx室外日光下,SiW11SnⅡ降解甲基红溶液达到上述同等效果仅需1 h,而SiW11SnⅡ/PVA复合膜则需8 h.虽然固载后催化剂的催化效率有所降低,但较好地解决了其与溶液的分离问题,并可重复利用.SiW11SnⅡ/PVA复合膜通过离心、水洗和干燥等过程后,循环使用3次,其催化活性几乎未发生变化.The polyoxometalate K6SiW11O39SnⅡ（SiW11SnⅡ） was synthesized,and photocatalytic degradation of methyl red solution was investigated under indoor nature light and outdoor sunlight.The effects of methyl red solution initial concentration,catalyst quantity and irradiation light source on the decolorization and TOC and COD removal rates were studied.When the initial methyl red concentration is 10mg/L with pH 2,catalyst 1g/L and average indoor light intensity of 3000lx,the decolorization rate of methyl red solution was 98%,TOC and COD removal rates were 84.2% and 89.6% respectively after 6h irradiation.In contrast the K6SiW11O39SnⅡ-polyvinyl alcohol（SiW11SnⅡ/PVA） complex film prepared by chemical self-assembled method takes 12h to achieve the same effect.With the average outdoor solar irradiation intensity of 78000lx,the degradation of the methyl red solution to achieve the same result needs 1h with SiW11SnⅡ and 8h with SiW11SnⅡ/PVA complex film.Although the catalytic efficiency of the support catalyst decreases,the problem for separation the dye solution with the catalyst was solved.SiW11SnⅡ/PVA complex film can be reused three time after centrifugation,washing and drying process without changing its catalytic activity.

关 键 词：多金属氧酸盐 光催化 甲基红 SiW11SnⅡ/PVA复合膜 脱色降解 

分 类 号：X703[环境科学与工程—环境工程]