摘要
将具有光催化潜力的Ti、Ni金属元素引入类水滑石(HTlcs)结构中,采用共沉淀法制备了一系列Ni/Ti二元类水滑石,焙烧后HTlcs前体材料转变为Ni/Ti复合氧化物(Ni/Ti-LDO),并用作光催化剂进行甲基橙光降解实验。用XRD、SEM、TG-DTA、元素分析等方法对产物的结构、形貌和组成进行表征,考察了金属离子配比、焙烧温度、催化剂用量等因素对催化甲基橙光降解的影响,并与通用TiO2光催化剂催化性能进行对比。实验结果表明,在相同催化剂浓度条件下,Ni/Ti金属摩尔比为4:1的Ni/Ti-LDO具有比TiO2更优越的催化降解甲基橙的性能。当催化剂前体Ni/Ti金属摩尔比为4:1,焙烧温度为450℃、催化剂用量为0.9 g L 1时,浓度为5×10 5mol L 1的甲基橙溶液于300 W紫外光照30 min,Ni/Ti-LDO对甲基橙的催化降解率可达98%以上。
The Ti, Ni metal elements with photocatalytic potential were introduced into Hydrotalcite-Like Compounds （HTlcs） to obtain photocatalytic materials. A series of Ni/Ti-HTlcs with various Ni/Ti ratios were prepared by co-precipitation method. After calcination, the HTlcs precursors were converted to Ni/Ti layered double oxides （Ni/Ti-LDO）, which were used as catalysts for the photo-degredation of methyl orange. XRD, SEM, TG-DTA and element analysis were used to characterize the structure, morphology and compostion of the Ni/Ti-LDO. Effects of Ni/Ti molar ratio, calcination temperature and catalyst dosage of Ni/Ti-LDO on the degradation ratio of methyl orange were investigated. Experimental results show that the Ni/Ti-LDO with Ni/Ti molar ratio of 4：1 has superior catalytic property to the same amount of common TiO2 photocatalyst. Using the Ni/Ti-LDO with Ni/Ti ratio of 4：1, calcination temperature of 450℃ and catalyst concentration of 0.9 g·L^-1, more than 98% of methyl orange （5 × 10^-5 mol·L^-1） can be degraded after the ultravoilet radiation time of 30 min at 300 W.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2013年第2期334-338,共5页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金(21106074)
山东省泰山学者基金(ts20070713)
山东省中青年科学家奖励基金(BS2009CL033)
关键词
类水滑石
复合氧化物
甲基橙
光催化
hydrotalcite-like compounds
layered double oxides
methyl orange
photocatalysis
