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以沉淀法制备的针铁矿为光催化剂,考察了Fe3+来源、反应方式、陈化温度及陈化时间等因素对合成针铁矿的影响,并利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)对不同因素制备的针铁矿矿相及微观形貌进行表征,确定了适宜的催化剂制备条件。选用双酚A(BPA)为目标污染物,研究了针铁矿的光催化性能。结果表明,采用将Na OH溶液逐滴滴加至Fe(NO3)3溶液中,在60℃条件下陈化12 h以上可以得到结晶度高、呈现均匀棒状的针铁矿,对BPA的去除率达90%以上。相比传统光-Fenton体系,UV/针铁矿/H_2O_2体系不仅可以拓宽p H值,而且可以减少H_2O_2的使用量,降低处理成本。
The goethite prepared by precipitation method was used as photocatalyst. The effects of Fe3 + source, reaction mode, aging temperature and aging time on the synthesis of goethite were investigated. XRD, (SEM) were used to characterize the phase and morphology of goethite prepared by different factors, and the suitable catalyst preparation conditions were determined. BPA was selected as the target pollutant to study the photocatalytic activity of goethite. The results show that the removal rate of BPA can be obtained by adding NaOH solution dropwise to Fe (NO3) 3 solution and aging at 60 ℃ for more than 12 h, with high crystallinity and uniform rod shape. More than 90%. Compared with the traditional photo-Fenton system, UV / goethite / H 2 O 2 system not only can broaden the p H value, but also reduce the amount of H 2 O 2 and reduce the processing cost.