摘要
本研究制备CN负载Pt催化剂(CN-Pt)电催化氧化高效去除海水养殖循环水中的氨氮.结果表明,优化催化剂组分为CN1+15%Pt时,氨氮的电催化活性最高,氧化起始电位为-0.34 V vs. Hg/HgO;通过正交试验得出,最优实验参数为催化剂负载试剂浓度C0 100 mg·mL^(-1)、阳极电势1.7 V vs. SCE、转速300 r·min^(-1)、pH 10;该实验条件下处理模拟海水养殖循环水,20 min氨氮去除率为79.89%.氨氮去除的主要作用因子是活性氯,无羟基自由基或硫酸根自由基的作用.在不改变pH条件下对实际养殖循环水进行处理,40 min氨氮去除率达97.04%. CN-Pt改性阳极电催化氧化去除海水养殖循环水中的氨氮效率高、易于操控,在循环水养殖系统的水处理中具有较大的应用潜力.
In this study,platinum nanoparticles supported on nitrogen-doped activated charcoal powder(CN-Pt)was prepared for efficient ammonia removal in mariculture recirculating seawater by electrocatalytic oxidation.The catalyst CN1+15%Pt showed the highest electrocatalytic activity of ammonia oxidation.The oxidation onset potential was-0.34 V vs.Hg/HgO.The orthogonal experiment indicated the optimal parameters were C0100 mg·mL^(-1),anodic potential 1.7 V vs.SCE,rotational speed 300 r·min^(-1),and pH 10.Under these conditions,the ammonia removal rate was79.89%in 20 min for the simulated aquaculture recirculating water treatment.The main functional factor is active chlorine,not hydroxyl radical nor sulfate radical.Treatment of actual aquaculture recirculating water without changing the pH,the ammonia removal rate reached 97.04%in 40 min.The CN-Pt modified anode electrocatalytic oxidation is used to remove ammonia in the recirculating seawater,this method is efficient and easy to operate,and of great application potential in the water treatment of recirculating aquaculture system(RAS).
作者
李伊晗
刘松涛
陈璐璐
高怡菲
宋婧
刘鹰
LI Yihan;LIU Songtao;CHEN Lulu;GAO Yifei;SONGJing;LIU Ying(Dalian Ocean University,Dalian,116023,China;Key Laboratory of Environment Controlled Aquaculture,Ministry of Education,Dalian,116023,China)
出处
《环境化学》
CAS
CSCD
北大核心
2021年第9期2864-2872,共9页
Environmental Chemistry
基金
国家重点研发计划项目(2019YFD0900501)
辽宁省教育厅科学研究经费项目(QL201906)资助。
关键词
氨氮
活性氧化物质
电催化氧化
铂
循环水养殖系统
ammonia
active oxygen species
electrochemical oxidation
Pt
recirculating aquaculture system
