摘要
采用共沉淀法合成了无定形MnO_(2)@c-CNTs复合材料,研究了其活化过一硫酸盐(PMS)降解苯酚的性能。通过SEM、XRD对不同材料的微观形貌、晶体结构进行了表征,复合材料由无定形MnO_(2)包覆于羧基化多壁碳纳米管(MWCNTs-COOH,简称c-CNTs)上组成,仍保持了羧基化多壁碳纳米管的相互交织缠绕管状结构,相比单独无定形MnO_(2)催化活性提升明显。研究了不同反应条件下苯酚降解率的变化,结果表明:在苯酚初始浓度10 mg/L时,降解率随催化剂投加量和PMS投加量增加而升高,在中性和酸性条件下降解效果较好,碱性条件下有小幅下降。在催化剂投加量0.14 g/L,PMS浓度0.6 mmol/L,温度25℃,中性条件下,苯酚降解率可达96.7%。无定形MnO_(2)@c-CNTs/PMS体系中参与反应的主要活性物种为^(1)O_(2)和·O_(2)^(-),以^(1)O_(2)为主导。
Amorphous MnO_(2)@c-CNTs composite was synthesized by coprecipitation method and its activated persulfate(PMS)degradation performance of phenol was studied.The microstructure and crystal structure of different materials were characterized by SEM and XRD.The composite material was composed of amorphous MnO_(2)coated on carboxylated multi-walled carbon nanotubes(MWCNTs-COOH,c-CNTs for short),and still maintained the interlacing and winding tubular structure of carboxylated multi-walled carbon nanotubes.Compared with amorphous MnO_(2)alone,the catalytic activity increased significantly.The degradation rate of phenol under different reaction conditions was studied.The results showed that when the initial concentration of phenol was 10 mg/L,the degradation rate increased with the increase of catalyst dosage and PMS dosage.The degradation effect was better under neutral and acidic conditions,but slightly decreased under alkaline conditions.Under the neutral conditions of catalyst dosage of 0.14 g/L,PMS concentration of 0.6 mmol/L and temperature of 25℃,the degradation rate of phenol can reach 96.7%.In the amorphous MnO_(2)@c-CNTs/PMS system,the main active species involved in the reaction were^(1)O_(2)and·O_(2)^(-),with^(1)O_(2)as the dominant species.
作者
赵昕琛
何争光
王太豪
刘振阳
董泽平
杨蕾
ZHAO Xinchen;HE Zhengguang;WANG Taihao;LIU Zhenyang;DONG Zeping;YANG Lei(School of Water Resources Science and Engineering,Zhengzhou University;School of Ecology and Environment,Zhengzhou University;Henan Ecological Urban Construction Design Institute Company;Zhengzhou Environmental Protection Science Research Institute:Zhengzhou,450001,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2023年第11期54-59,共6页
Technology of Water Treatment
基金
国家科技重大专项水专项(2017ZX07062-001-002)。
