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选取苯酚为目标降解物,采用正交实验法,以1∶11系列Keggin型新型多金属氧酸盐K6Ti W11O39SnⅡ(Ti W11Sn)、K6Zr W11O39SnⅡ(Zr W11Sn)、K8Si W11O39SnⅡ(Si W11Sn),与商品化的1∶12系列多金属氧酸盐H3PW12O40与H4Si W12O40为光催化剂,在阳光辐照下,研究了均相溶液中上述催化剂对苯酚水溶液光催化降解效果.结果表明,阳光辐照下,上述5种光催化剂对苯酚水溶液皆有降解作用,实验条件不同,降解效果差异较大.正交实验结果表明,苯酚溶液初始浓度、初始p H值、光照时间、催化剂种类及催化剂投加量均对其降解效果产生影响.上述影响因素重要性顺序为:光催化剂种类>光照时间>苯酚溶液初始p H值>苯酚溶液初始浓度>POM催化剂投加量.其中,Ti W11Sn光催化苯酚降解效果最好.当苯酚溶液初始浓度为3.05 mg/L,初始p H值为5,光照时间为5 h,溶液中Ti W11Sn浓度为0.25 g/L时,苯酚降解率为51.72%,其光催化降解反应遵循Langmuir-Hinshelwood准一级动力学方程.
Phenol was selected as the target degradation product. Orthogonal experiments were carried out to study the effects of commercialization of Keggin-type novel polyoxometallates K6TiW11O39SnⅡ (Ti W11Sn), K6Zr W11O39SnⅡ (Zr W11Sn) and K8Si W11O39SnⅡ (Si W11Sn) Of 1: 12 series of polyoxometalates H3PW12O40 and H4Si W12O40 as photocatalysts, the photocatalytic degradation of phenol in aqueous solution in homogeneous solution was studied under the condition of sunlight irradiation.The results showed that under sunlight irradiation, the above 5 The results showed that the initial concentration of phenol solution, the initial p H value, the illumination time, the type of catalyst and the dosage of catalyst were the best parameters for the photocatalyst degradation of phenol aqueous solution, the experimental conditions were different, The order of importance of the above factors is: photocatalyst type> illumination time> initial p H value of phenol solution> initial concentration of phenol solution> dosage of POM catalyst, among them, the photocatalytic degradation effect of phenol by Ti W11Sn is the best. The phenol degradation rate was 51.72% when the initial concentration of phenol solution was 3.05 mg / L, the initial p H value was 5, the illumination time was 5 h and the concentration of Ti W11Sn was 0.25 g / L. The photocatalytic degradation It should follow the quasi-order kinetic equation Langmuir-Hinshelwood.