摘要
采用溶胶-凝胶法制备多孔氧化钛,并耦合CdS,制备多孔耦合CdS/TiO2催化剂.煅烧温度为700℃,CdS掺杂比例为3%时,催化剂性能较优.以太阳光为光源,考查了溴氨酸初始浓度对其降解效果的影响,并采用冷冻-光催化组合方法对较高浓度的溴氨酸废水的处理进行了初步研究.浓度为500 mg/L的溴氨酸模拟废水(其中氯化钠质量浓度为500 mg/L)经冷冻后,当成冰率为70%时,体系中冰层的Na+含量、总有机碳(TOC)和吸光度分别由209.88 mg/L,208.90 mg/L和8.120降至19.06 mg/L,24.80 mg/L和0.638.使用多孔耦合催化剂对该冰层融水光降解,光照6 h,褪色率和TOC去除率分别达到100%和87.04%.
Porous coupling CdS/TiO2 photocatalyst was prepared by coupling CdS with porous TiO2 by a sol-gel process. Preliminary research suggested that the optimal calcining temperature is 700 ℃, and CdS doped proportion is 3 %. Irradiated by sunlight, the effect of initial concentration of the bromamine acid on the degradation using photocatalytic was discussed. Moreover, pilot study on the treatment of wastewater with higher concentration of bromamine acid by combined freeze and photocatalysis was processed. After freezing, the wastewater with 500 mg/L bromamine acid and 500 mg/L sodium chloride was purified. When 70% of wastewater was frozen, the content of Na＋ , total organic carbon （TOC） and chroma of melted ice is decreased from 209.88 mg/L, 208.90mg/L and8. 120 to 19.06 rag/L,24.80 mg/L and 0. 638, respectively. Then the melted water was degradated by porous coupling CdS/TiO2 photocatalyst under sunlight. After 6 hours, the removal rate of chroma and total organic carbon reached 100 % and 87.04 %, respectively.
出处
《影像科学与光化学》
CAS
CSCD
2008年第5期417-424,共8页
Imaging Science and Photochemistry
关键词
二氧化钛
光催化
冷冻
titanium dioxide
photocatalysis
freeze
