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采用溶胶-凝胶法制备了二氧化钛/多壁碳纳米管(TiO2/MWCNTs)复合材料,其m(TiO2)∶m(MWCNTs)=3∶4、表面平均孔径为5.724 nm。选用该复合材料对乐果进行光催化降解试验,探讨不同光源及光照时间、乐果初始浓度、复合材料添加量、温度等对其光催化降解能力的影响。结果表明:乐果在25℃、紫外光照30 min、初始质量浓度为5 mg/L和TiO2/MWCNTs复合材料添加量为0.25 g/L条件下的降解率为80.7%,TiO2/MWCNTs复合材料的最大吸附量为16.15 mg/g;在其他条件相同,仅将紫外光改为自然光条件下,乐果的催化降解率为79.2%,与紫外光下的催化降解率相差不大;而同等条件下,Ti O2对乐果在紫外光下的催化降解率比TiO2/MWCNTs低33.1%。因此,可以用自然光代替紫外光用于吸附试验,自然条件下采取该工艺可有效降解环境中乐果污染。
The TiO2 / MWCNTs composites were prepared by the sol-gel method. The average pore diameter of the TiO2 / MWCNTs was 3: 4 and the average pore size was 5.724 nm. The composite material was used for the photodegradation of dimethoate. The effects of different light sources and illumination time, the initial concentration of dimethoate, the amount of composite material and temperature on the photocatalytic degradation of dimethoate were studied. The results showed that the degradation rate of dimethoate was 80.7% under the conditions of 25 ℃, UV irradiation for 30 min, initial concentration of 5 mg / L and TiO2 / MWCNTs composite dosage of 0.25 g / L, and the degradation rate of TiO2 / MWCNTs composites The maximum adsorption capacity was 16.15 mg / g. Under the same conditions, the catalytic degradation rate of dimethoate was only 79.2% when the UV light was changed to natural light, and the difference was not different from that under ultraviolet light. Under the same conditions The catalytic degradation rate of dimethoate on dimethoate was 33.1% lower than that of TiO2 / MWCNTs. Therefore, the natural light can be used instead of UV light for adsorption test. Under natural conditions, this process can effectively detoxify enoxaparin in the environment.