炉渣制光催化剂催化降解水中罗丹明B的研究

以废弃的钢铁冶炼炉渣为原料制备了光催化剂GN,并对其进行了X衍射、紫外-可见漫反射吸收光谱、比表面积及孔径分布等物性测试,通过在三相内循环流化床光催化反应器中对罗丹明B废水进行处理,确定了GN的最佳光催化氧化条件.将GN与传统的光催化剂TiO2作比较,结果表明,GN不仅具备较高的光催化活性,而且成本更低,为钢铁冶炼炉渣的循环再利用提供了一种新思路,同时也为光催化氧化技术的工业化应用提供了一条新颖、经济、可行的途径.     

非金属掺杂TiO2的可见光活性及机理研究进展

光催化剂TiO2因其大禁带宽度（E=3．2eV）,致使不能有效地利用太阳能,因此研究开发可见光响应的TiO2就成为当前光催化剂研究的关键课题。非金属掺杂可使TiO2响应可见光,文章综述了各种非金属（N、S、P、C、B和卤素）掺杂TiO2光催化剂在可见光范围的响应、光催化性能以及它们可能的响应机理,提出了可见光响应型光催化剂现存的问题和发展方向。     

Preparations of TiO2 film coated on foam nickel substrate by sol-gel processes and its photocatalytic activity for degradation of acetaldehyde

Anatase TiO2 films were successfully prepared on foam nickel substrates by sol-gel technique using tetrabutyl titanate as precursor. The characteristics of the TiO2 films were investigated by XPS, XRD, FE-SEM, TEM and UV-Vis absorption spectra. The photocatalytic activities of TiO2 films were investigated by photocatalytic degradation reactions of gaseous acetaldehyde, an indoor pollutant, under ultraviolet light irradiation. It was found that Ni^2＋ doping into TiO2 films due to the foam nickel substrates resulted in the extension of absorption edges of TiO2 films from UV region to visible light region. The pre-heating for foam nickel substrates resulted in the formation of NiO layer, which prevented effectively the injection of photogenerated electrons from TiO2 films to metal nickel. The TiO2 films displayed high photocatalytic activity for the degradation of acetaldehyde, and were enhanced by calcining the substrates and coating TiO2 films repeatedly. The high activity was mainly attributed to the improvement of the characteristics of substrate surface and the increase of active sites on photocatalyst.     

卤氧化铋/石墨烯复合光催化剂的研究进展

卤氧化铋/石墨烯是一种具有良好可见光催化活性的复合光催化材料,成为众多学者的研究热点.综述了水热法、溶剂热法、沉淀法和超声/微波辅助法等合成方法在卤氧化铋/石墨烯复合催化剂制备中的应用,总结了石墨烯/卤氧化铋在废气净化和废水处理中的应用,并从制备方法改进、应用领域拓展、催化活性提高等方面对卤氧化铋/石墨烯复合催化剂的研...     

废水处理用CNT改性TiO2光催化剂的制备及其性能表征

以碳纳米管(CNT)和TiO2为原料,通过溶胶-凝胶工艺制得废水处理用CNT/TiO2复合材料,考察了CNT/TiO2催化剂对罗丹明B(RhB)降解反应的催化性能,分析了催化反应机理,并表征了该材料的结构及光电等性能.光催化实验结果表明,最优CNT添加量为6％(w),最优CNT/TiO2加入量为0.6 g/L.结构和表...     

PANI-TiO_2光催化剂的制备及其降解甲基橙的性能

采用溶胶-凝胶法和原位氧化聚合法制备了新型聚苯胺修饰纳米TiO_2(PANI-TiO_2)复合光催化剂。以甲基橙溶液模拟有机染料废水,考察了过硫酸钾加入量、苯胺加入量、盐酸浓度及反应温度对PANI-TiO_2复合光催化剂降解甲基橙性能的影响。采用XRD,UV-vis,FTIR技术对PANI-TiO_2复合光催化剂进行了表征。实验结果表明:PANI-TiO_2复合光催化剂降解甲基橙的最适宜工艺条件为:n(过硫酸钾):n(钛酸四丁酯)=0.1,n(苯胺):n(钛酸四丁酯)=0.11,盐酸浓度2 mol/L,反应温度20℃,在此最适宜条件下,反应时间为60 min时,甲基橙降解率为97%。表征结果显示:与TiO_2相比,PANI-TiO_2复合光催化剂明显发生了红移现象,带隙变窄,有利于光催化反应效率的提高;与PANI相比,PANI-TiO_2复合光催化剂的红外特征峰向低波数的方向发生偏移;PANI-TiO_2复合光催化剂为锐钛矿型。     

TiO2/SiO2光催化剂制备及对偶氮染降解的研究

以多孔硅胶为基质，钛酸四丁酯和环已烷为源，通过浸渍的方法，合成了表面键联型TiO2／SiO2光催化剂，通过Zeta电位、BET和粒度分析、XRD分析、FUR分析，确定氧化钛是通过Ti-O-Si键的联结负载在多孔硅胶表面上。探讨了催化降解条件的变化对降解活性艳红X-3B；活性亮橙K—R和阳离子红CIR-22的影响，最后确定了TiO2／SiO2催化降解偶氮染料的最佳工艺条件。     

Visible light induced photodegradation of organic pollutants on nitrogen and fluorine co-doped TiO2 photocatalyst

The nitrogen and fluorine co-doped TiO2 polycrystalline powder was synthesized by calcinations of the hydrolysis product of tetrabutyl titanate with ammonium fluoride. Nitrogen and fluorine co-doping causes the absorption edge of TiO2 to shift to a lower energy region.The photocatalytic activity of co-doped TiO2 with anatase phases was found to be 2.4 times higher than that of the commercial TiO2 photocatalyst Degussa P‘25 for phenol decomposition under visible light irradiation. The co-doped TiO2 powders only contain anatase phases even at 1000%. Apparently, ammonium fluoride added retarded phase transformation of the TiO2 powders from anatase to futile.The substitutional fluorine and interstitial nitrogen atoms in co-doped TiO2 polycrystalline powder were responsible for the vis light response and caused the absorption edge of TiO2 to shift to a lower energy region.     

Ag、N共掺杂TiO2漂浮型催化剂的光催化性能

采用溶胶-凝胶法,制备出银氮共掺杂TiO_2负载膨胀珍珠岩的催化剂,通过电子显微镜扫描(SEM)、比表面积及孔径分析(BET)和X射线衍射(XRD)对其结构进行表征,并以罗丹明B溶液为目标降解物,研究所制备催化剂的光催化性能。结果表明:复合材料成功负载了Ag和N元素,且掺杂增强了TiO_2对可见光的响应能力;复合材料存在少量的微孔和大孔,同时存在大量的介孔;掺杂氮后材料的光催化活性大幅度提高,继续掺杂Ag后光催化活性进一步提高,当n(Ag)∶n(Ti)=0. 50%时光催化性能最佳,4 h内处理罗丹明B降解率可达99. 3%,材料的光催化反应符合一级反应动力学方程,表明其在环境净化实际应用中的巨大潜力。     

半导体光催化氧化

主要介绍半导体光催化氧化降解有机污染物的过程和影响光催化氧化活性的因素，指出了光催化氧化领域的一些新进展。