Cu-FeO_(x)@AC活化PMS体系除藻效能与机制  

Efficiency and mechanism of Cu-FeO_(x)@AC activated peroxymonosulfate system for algae removal

作　　者：陈昊天 向平[1] 姜文超[1] 李玉平 周元[1] 王凯[1] CHEN Haotian;XIANG Ping;JIANG Wenchao;LI Yuping;ZHOU Yuan;WANG Kai(College of Environment and Ecology,Chongqing University,Chongqing 400043,P.R.China)

机构地区：[1]重庆大学环境与生态学院,重庆400043

出　　处：《重庆大学学报》2023年第12期22-33,共12页Journal of Chongqing University

基　　金：重庆市建设科技项目(城科字2020第5-2)。

摘　　要：为探究富营养化水体中藻类的新型治理技术,通过水热法和高温煅烧法,使颗粒活性炭(AC)表层上负载铜铁双金属氧化物Cu-FeO_(x),制得可回收的Cu-FeO_(x)@AC复合催化剂。以XRD、SEM、FTIR和XPS对Cu-FeO_(x)@AC的表征为基础,研究Cu-FeO_(x)占AC的负载比、过一硫酸盐(PMS)使用量、初始pH及不同反应体系对除藻的影响,探究Cu-FeO_(x)@AC活化过一硫酸盐体系的除藻效能。Cu-FeO_(x)@AC活化过一硫酸盐体系反应机理,通过自由基淬灭实验、XPS表征进行探究。结果可知,初始pH为6,初始藻细胞密度为1.4×10^(9)个/L,使用催化剂0.5 g/L,PMS 0.2 g/L时,反应90 min,该体系对藻的降解率有97.25%。在该体系中,藻细胞能被吸附在Cu-FeO_(x)@AC复合催化剂表面,在铜、铁不同价态离子的转换及AC的协同作用下,产生空穴、·O^(-)2、·OH、SO^(-)_(4)·,单线态氧等多种氧化基团而被去除。A recyclable composite catalyst,Cu-FeO_(x)@AC,comprising Cu-Fe bimetallic oxides loaded on granular activated carbon,was developed for exploring novel algal treatment technology in eutrophic water.The catalyst was prepared using hydrothermal and high-temperature calcination methods and characterized via XRD,SEM,FTIR and XPS.Investigations into the effects of Cu-FeO_(x)loading ratio on AC,PMS quantity,initial pH,and different reaction systems were conducted to optimize algae removal.The study also explored the algae removal efficiency of the Cu-FeO_(x)@AC activated PMS system.Free radical shielding experiments and XPS analysis were carried out to explore the reaction mechanism of the Cu-FeO_(x)@AC activated PMS system.Results showed that at 9 an initial pH of 6,initial algae concentration of 1.4×10^(9) per liter,catalyst dosage of 0.2 g/L,and PMS dosage of 0.5 g/L,the algae degradation rate reached 97.25%within 90 min.In this system,algal cells were adsorbed onto Cu-FeO_(x)@AC,facilitating valence conversion between Fe and Cu.The synergistic action of AC and the composite catalyst produced holes,·O^(-)_(2)、·OH,SO^(-)_(4)·and singlet oxygen,effectively removing algal cells.

关 键 词：铜铁双金属氧化物 活性炭 过一硫酸盐 藻类 铜绿微囊藻 

分 类 号：X131[环境科学与工程—环境科学]