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HA(humic acids,腐植酸)是一种难降解天然有机物,常规饮用水处理工艺很难将其去除.采用水热合成法制备纳米管TiO2,并通过TEM(透射电镜)、XRD(X射线衍射)、XPS(X射线光电子能谱)和BET比表面积分析对催化剂进行表征,考察纳米管TiO2光催化臭氧化对HA的去除效果.结果表明:①254 nm紫外光照射下,500℃煅烧纳米管TiO2催化臭氧化HA的工艺去除效果最佳,HA去除率可达42.1%,较单独臭氧化工艺提高92.2%.②采用Fe3+掺杂纳米管TiO2催化臭氧化工艺时,Fe3+掺杂量为1.0%(原子百分含量),煅烧温度为550℃时,催化效果最好,HA去除率可达79.5%.③HA去除率高于TOC,0~10min内该现象更为明显.④考察陶粒和活性炭负载Fe3+掺杂纳米管TiO2的催化效果及催化次数对催化性能的影响发现,陶粒和活性炭负载Fe3+掺杂纳米管TiO2存在下,HA去除率分别为85.1%和97.7%,使用4次后,HA去除率分别为73.9%和82.8%.
Humic acid (HA) is a kind of refractory natural organic substance, which is difficult to be removed by conventional drinking water treatment.Nanotube TiO2 was prepared by hydrothermal method and characterized by TEM (transmission electron microscopy), X-ray diffraction ), XPS (X-ray photoelectron spectroscopy) and BET specific surface area were used to characterize the catalyst. The removal of HA by TiO2 photocatalytic ozonation was investigated. The results showed that: (1) The results showed that the removal rate of HA was up to 42.1%, which was 92.2% higher than that of the single ozonation process.② When Fe3 + -doped nanotubes were used for the catalytic ozonation process, the Fe3 + doping amount was 1.0% Atomic percent), the calcination temperature is 550 ℃, the best catalytic effect, HA removal rate up to 79.5% .③ HA removal rate higher than the TOC, 0 ~ 10min the phenomenon is more obvious.④Ceramic and activated carbon load The catalytic effect of Fe3 + -doped nanotubes TiO2 and the influence of the catalytic times on the catalytic performance of the catalyst were investigated. It was found that the HA removal efficiencies were 85.1% and 97.7% in the presence of ceramic and Fe3 + -doped nanotubes, respectively. After 4 times of treatment, HA The removal rates were 73.9% and 82.8% respectively.