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以钛酸丁酯为前驱体,以表面改性后的多壁碳纳米管(MWCNT)为载体,采用溶胶-凝胶法制备出TiO2粒子负载在碳纳米管表面的复合光催化剂,通过XRD、TEM、IR、UV-vis等手段对复合材料进行了表征。结果表明,TiO2均匀包覆在碳纳米管的表面,经500℃煅烧2 h后,纳米TiO2以锐钛型为主,粒径约15 nm,复合材料在紫外区及可见光区对光都有优良的吸收性能。并研究了MWCNT/TiO2光催化剂在紫外灯照射下对单宁酸(模拟栲胶)光催化降解情况,以CODcr的变化评价溶液中栲胶的降解情况。结果表明,在光照6 h后,溶液CODcr值从初始的3 024降到2 000,而用纯TiO2要达到相同的效果需要20 h以上。说明复合材料对单宁酸有很好的光催化降解效果,对研究制革植鞣废水的处理提供了参考。
A composite photocatalyst with TiO2 particles supported on the surface of carbon nanotubes was prepared by sol-gel method using butyl titanate as a precursor and multi-walled carbon nanotubes (MWCNT) modified by surface modification. The photocatalysts were characterized by XRD, TEM, IR, UV-vis and other means of composite materials were characterized. The results show that TiO2 is uniformly coated on the surface of carbon nanotubes. After being calcined at 500 ℃ for 2 h, the nano-TiO2 is anatase-based and has a particle size of about 15 nm. The composite has excellent light performance in the UV and visible regions Absorption performance. The photocatalytic degradation of tannin (simulated 栲 gum) under MWUVT / TiO2 photocatalyst was studied. The degradation of 栲 gum in solution was evaluated by the change of CODcr. The results showed that after 6 h of light irradiation, the CODcr value of the solution dropped from 3 024 to 2 000 in the initial stage, whereas it took more than 20 h to achieve the same effect with pure TiO2. It shows that the composite material has a good photocatalytic degradation effect on tannic acid and provides a reference for the research on tanning tanning wastewater treatment.