反蛋白石结构BiVO_4/WO_3催化处理苯酚废水研究

Study on Phenolic Wastewater Catalytic Treatment by Inverse Opal BiVO_4/WO_3

采用溶剂蒸发-提拉法以苯乙烯为模板制备了反蛋白石结构BiVO_4/WO_3复合光催化材料。对其结构进行了表征,考察了其在可见光照射条件下对苯酚的光催化性能。结果表明,反蛋白石结构BiVO_4/WO_3具有较好的光催化活性,能有效去除水体中的苯酚。在苯酚质量浓度80 mg/L范围内,催化剂对苯酚含量不敏感,90 min后去除率基本达到99%,去除效率远高于普通WO_3。在降解过程中加入一定浓度的H2_O_2对光催化有促进作用,过量则抑制降解,H_2O_2的适宜浓度为5 mmol/L,此时苯酚(质量浓度20 mg/L)去除率为99.7%。降解体系中含草酸对光催化反应有抑制作用,且草酸含量越高抑制越严重。催化剂在重复使用5次后苯酚的去除率超过90%,该催化剂在处理苯酚废水方面具有较高的应用价值。

The composite photocatalytic material of inverse opal BiVO4/WO3 was successfully prepared by solvent evaporation and czochralski method,and styrene as the template. The microstructures of the BiVO4/WO3 photocatalyst were characterized, and the photocatalytic performance for phenol with visible light irradiation was investigated. Results showed that the inverse opal BiVO4/WO3 could effectively remove phenol from water. Within the range of 80 mg/L mass concentration of phenol, the remove rate of phenol was not quite different, the removal rate of phenol reached 99% after 90 min degradation,which was much higher than that of normal WO3. Adding of hydrogen peroxide could promote photocatalysis. However, excessive hydrogen peroxide could inhibit degradation. The suitable concentration of H2O2 was 5 mmol/L, the phenol(mass concentration was 20 mg/L) removal rate reached 99.7%.Oxalate in water inhibited phenol degradation and removal, the higher content of oxalate was, the stronger inhibition effect resulted. After the catalyst was reused for 5 times, the removal rate of phenol still exceeded 90%. The catalyst had high application value in the treatment of phenol wastewater.