摘要:
用钛酸四正丁酯为原料,通过溶胶凝胶法制取具有较高光催化性能的钨、氮掺杂二氧化钛。然后采用氨气鼓泡法将制备好的二氧化钛与氯化镁溶液混合后通入氨气,加热搅拌,最终得到氢氧化镁-氧化钛复合材料。通过XRD、SEM、XPS、FT-IR等表征方法,对所得到的Mg(OH)2/TiO2多功能复合材料的性质进行研究。结果表明:该复合材料粒度分布宽度为5.5200μm,D50等于7.1800μm,产品为分散均匀、形貌规则,表面附着有微型球状二氧化钛颗粒的六方片状粉体。氢氧化镁所附着的球形二氧化钛颗粒为锐钛矿型,复合材料中氢氧化镁和二氧化钛间存在Mg-O-Ti化学键作用。在300~400℃的分解失重为24.5%,最强吸热温度为387.1℃,符合氢氧化镁阻燃剂的技术指标要求。同时采用震荡烧瓶法对复合材料的抗菌性能进行测试,结果震荡烧瓶法测得其对大肠杆菌的灭菌率120 min时达到83.7%。
Abstract:
Titanium dioxide （TiO2） doped with nitrogen and tungsten,having a high photocatalysis performance,was prepared by sol-gel method with tetra-n-butyl titanate as raw material. Magnesium hydroxide （Mg（OH）2）-titanium oxide composite materials were obtained by bubbling ammonia in mixture of the prepared TiO2 and magnesium chloride （MgCl2） solution,then heating and stirring. Employing XRD,SEM,XPS and FT-IR,the properties of the Mg（OH）2/ TiO2 composite were investigated. The results show that the size distributional width of the composite is 5.5200 μm and D50 is 7.1800 μm. The composite is well dispersed and has a regular morphology,with tiny spherical TiO2 particles adhered on the surface of the hexagonal flake powder. The spherical particles adhered on Mg（OH）2 powder are anatase TiO2,and there exists Mg-O-Ti chemical bonding between Mg（OH）2 and TiO2 in the composite. The weight loss of the composite is 24.5% under 300~400 ℃ with 387.1 ℃ of strongest endothermic temperature,meeting the requirements of Mg（OH）2 flame retardant. The antibacterial properties of the composite were also tested by shake flask method,and the sterilization rate for coli can reach to 83.7% in 120 min.
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