摘要
采用共沉淀法制备了CoMgFe-LDH,并以其作为前驱体制备了CoMgFe-LDO催化剂,对其活化过一硫酸盐(PMS)处理双酚A废水的效果进行研究。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)和傅立叶变换红外吸收光谱仪(FTIR)等方式对制备出的催化剂进行表征。研究了PMS投量、催化剂投量、初始pH、初始双酚A浓度对CoMgFe-LDO/PMS体系处理效果的影响,并进行自由基猝灭实验探究CoMgFe-LDO催化过一硫酸盐去除双酚的降解机理。结果表明:CoMgFe-LDO能够催化PMS高效降解双酚A;存在合适的PMS投量使得双酚A的去除效果最高,较低的催化剂投量对双酚A的降解效果有所限制;在pH为5和7的条件下双酚A的降解效果最好,在碱性条件下催化效率显著降低。在实际处理时,反应条件控制在PMS 1 g/L、催化剂投量0.5 g/L,pH为7,反应30 min时,对双酚A的降解率可达98.84%。自由基猝灭实验表明,在CoMgFe-LDO/PMS催化体系中,单线态氧是双酚A降解过程中最主要的活性组分。该研究证明了CoMgFe-LDO/PMS催化体系对双酚A废水处理的有效性。
In this study, CoMgFe-LDH was prepared by the coprecipitation method, and the CoMgFe-LDO catalyst was prepared by using it as a precursor. The effect of activating permonosulfate(PMS) on the bisphenol A wastewater was studied. The prepared catalysts were characterized by scanning electron microscope(SEM), X-ray diffractometer(XRD) and Fourier transform infrared absorption spectrometer(FTIR). The effects of PMS dosage, catalyst dosage, initial pH, and initial bisphenol A concentration on the treatment effect of CoMgFe-LDO/PMS system were studied, and free radical quenching experiments were conducted to explore the effect of CoMgFe-LDO on the degradation mechanism of removal of bisphenol by catalyzed peroxymonosulfate. The results showed that the CoMgFe-LDO can catalyze the efficient degradation of bisphenol A by PMS;the presence of a suitable dosage of PMS makes the removal effect of bisphenol A the highest, and the lower dosage of catalyst has a limited effect on the degradation of bisphenol A. The degradation effect of bisphenol A was the best under the conditions when pH was 5 and 7, and the catalytic efficiency was significantly reduced under alkaline conditions. In the actual treatment, the reaction conditions were controlled at 1 g/L of PMS, the dosage of catalyst was 0.5 g/L, the pH was 7, and the degradation rate of bisphenol A could reach 98.84% when the reaction was carried out for 30 min. The radical quenching experiments showed that the singlet oxygen was the main active component during the degradation of BPA in the CoMgFe-LDO/PMS catalytic system. This study demonstrated the effectiveness of the CoMgFe-LDO/PMS catalytic system for the treatment of bisphenol A wastewater.
作者
付明翔
张丽
刘东方
徐俐
童笑琴
曹振华
FU Mingxiang;ZHANG Li;LIU Dongfang;XU Li;TONG Xiaoqin;CAO Zhenhua(School of Environmental Science and Engineering,Nankai University,Tianjin 300350,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2023年第3期53-58,共6页
Technology of Water Treatment
基金
沧州渤海新区制药与化工行业高盐有机废水处理与零排放研究与应用(NCC2020FH11)。
