학술논문
改性碳材料间歇式电氧化去除养殖海水中氨氮研究 / Removal of ammonia nitrogen from cultured seawater by intermittent electrochemical oxidation with modified carbon materials
Document Type
Academic Journal
Author
Source
环境污染与防治 / Environmental Pollution and Control. 46(1):38-42
Subject
Language
Chinese
ISSN
1001-3865
Abstract
氨氮是养殖海水中主要污染物之一.电氧化法在去除氨氮方面具有较好应用前景.采用水热法在碳棒上负载镍铜氢氧化物催化剂并优化其组成比例,采用电氧化处理模拟养殖海水,并探究氨氮去除率的影响因素和中间产物的变化.结果表明:(1)最优催化剂为总离子摩尔浓度1.0 mmol/L、Ni2+和Cu2+摩尔比8∶2下制备得到的催化剂.(2)最优实验条件为极板间距1.0 cm、电极长度2.0 cm、电压1.7 V、温度40℃,此时氨氮去除率达99.9％.(3)采用间歇式加电的方式对氨氮为12 mg/L的模拟养殖海水进行处理,加电、断电阶段氨氮去除量分别为3.97、0.44 mg/(cm2·h),断电阶段一氯胺去除氨氮占主导地位.
Ammonia nitrogen is a major pollutant in aquaculture seawater,and electrochemical oxidation shows promise for its removal.A hydrothermal method was employed to load a nickel-copper hydroxide catalyst onto a carbon rod and optimize its composition ratio.The effects of various factors on the removal rate of ammonia nitrogen and the changes in intermediate products during electrochemical oxidation of simulated cultured seawater were investigated.The results indicated that:(1)the optimal catalyst was prepared with a total ion molar concentration of 1.0 mmol/L and a Ni2+∶Cu2+molar ratio of 8∶2.(2)The optimal experimental conditions included a plate spacing of 1.0 cm,electrode length of 2.0 cm,voltage of 1.7 V,and temperature of 40℃,resulting in a removal rate of ammonia nitrogen of 99.9％.(3)The simulated cultured seawater,with an ammonia nitrogen concentration of 12 mg/L,was treated using intermittent electrification.During the electrification and de-electrification stages,the removal amounts of ammonia nitrogen were 3.97 and 0.44 mg/(cm2·h)respectively.During de-electrification stage,monochloramine dominated the removal of ammonia nitrogen.
Ammonia nitrogen is a major pollutant in aquaculture seawater,and electrochemical oxidation shows promise for its removal.A hydrothermal method was employed to load a nickel-copper hydroxide catalyst onto a carbon rod and optimize its composition ratio.The effects of various factors on the removal rate of ammonia nitrogen and the changes in intermediate products during electrochemical oxidation of simulated cultured seawater were investigated.The results indicated that:(1)the optimal catalyst was prepared with a total ion molar concentration of 1.0 mmol/L and a Ni2+∶Cu2+molar ratio of 8∶2.(2)The optimal experimental conditions included a plate spacing of 1.0 cm,electrode length of 2.0 cm,voltage of 1.7 V,and temperature of 40℃,resulting in a removal rate of ammonia nitrogen of 99.9％.(3)The simulated cultured seawater,with an ammonia nitrogen concentration of 12 mg/L,was treated using intermittent electrification.During the electrification and de-electrification stages,the removal amounts of ammonia nitrogen were 3.97 and 0.44 mg/(cm2·h)respectively.During de-electrification stage,monochloramine dominated the removal of ammonia nitrogen.