摘要
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。
A goethite photocatalyst was prepared using the precipitation method. The effects of the Fe3＋ source, reaction mode, aging temperature, and time on the preparation of goethite were investigated. In addi- tion, X-ray diffraction （XRD） and scanning electron microscope （SEM） were employed for the characterization of the crystal phase and micro-morphology. The optimal preparation conditions were determined from varying the parameters under which the goethite was synthesized. The photocatalytic degradation performance of goethite was investigated by using bisphenol A （BPA） as the target contaminant. The results indicated that the highly crystal- ized and uniform rod-like goethite was obtained by adding NaOH dropwise into Fe（NO3） 3, and aging the reac- tion under 60 ℃ for over 12 h; this achieved a BPA removal efficiency that exceeds 90%. Compared to the tra- ditional photo-Fenton system, the UV/goethite/H202 system can not only broaden the pH range of utilization, but also reduce the amount of hydrogen peroxide used, thereby decreasing the processing costs.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第9期4842-4848,共7页
Chinese Journal of Environmental Engineering
基金
中国博士后科学基金资助项目(2014M561356)
中央高校基本科研业务费专项基金资助(HIT.NSRIF.201671)
城市水资源与水环境国家重点实验室(哈尔滨工业大学)自主课题(2015DX03)
关键词
沉淀法
针铁矿
双酚A
光催化活性
precipitation method
goethite
bisphenol A
photocatalytic activity
