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Preparation of Clay/Biochar Composite Adsorption Particle and Performance for ammonia nitrogen removal from Aqueous Solution

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Journal of Ocean University of China 2020年第3期19卷 729-739页

作者： HUANG Xiao BAI Jie LI Kuiran ZHAO Yangguo TIAN Weijun HU Chunhui College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China College of Marine Life Science Ocean University of ChinaQingdao 266003China Nanjing University of Information Science and Technology Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologyJiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlNanjing 210044China

This study aimed to present a novel clay/biochar composite adsorption particle, which made from abandoned reed straw and clay to remove ammonia nitrogen(NH4^+-N) from micro-contaminated water. The removal performance of NH4^+-N by composite adsorption particle was monitored under different raw material proportions and initial NH4^+-N concentration. Besides, adsorption kinetics and adsorption isotherms were investigated to reveal the adsorption mechanisms. The results showed that NH4^+-N was effectively removed under optimal proportion of biochar, foaming agent and crosslinker with 20%, 3%, and 3%, respectively. The optimal contact time was 150 min and the best removal efficiency was 88.6% at initial NH4^+-N concentration of 20 mg L^-1. The adsorption performance was well described by the second order kinetic model and Freundlich model. The novel clay/biochar composite adsorption particle in this study demonstrated a high potential for NH4^+-N removal from surface water.

关键词： clay biochar composite adsorption particle ammonia nitrogen removal adsorption mechanism

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Electrochemical removal of ammonium nitrogen in high efficiency and N_(2) selectivity using non-noble single-atomic iron catalyst

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Journal of Environmental Sciences 2023年第3期125卷 544-552页

作者： Fengjiao Quan Guangming Zhan Bing Zhou Cancan Ling Xiaobing Wang Wenjuan Shen Jianfen Li Falong Jia Lizhi Zhang College of Chemical and Environmental Engineering Wuhan Polytechnic UniversityWuhan 430023China Institute of Environmental&Applied Chemistry College of ChemistryCentral China Normal UniversityWuhan 430079China School of Chemistry and Civil Engineering Shaoguan UniversityShaoguan 512005China

ammonia nitrogen (NH_(4)^(+)-N) is a ubiquitous environmental pollutant,especially in offshore aquaculture *** oxidation is very promising to remove NH_(4)^(+)-N,but suffers from the use of precious metals *** this work,a robust and cheap electrocatalyst,iron single-atoms distributed in nitrogen-doped carbon (Fe-SAs/N-C),was developed for electrochemical removal of NH_(4)^(+)-N from in wastewater containing *** FeSAs/N-C catalyst exhibited superior activity than that of iron nanoparticles loaded carbon(Fe-NPs/N-C),unmodified carbon and conventional Ti/IrO_(2)-TiO_(2)-RuO_(2)*** high removal efficiency (>99%) could be achieved as well as high N_(2)selectivity (99.5%) at low current *** experiments and density functional theory (DFT) calculations demonstrated the indispensable role of single-atom iron in the promoted generation of chloride derived species for efficient removal of NH_(4)^(+)-*** study provides promising inexpensive catalysts for NH_(4)^(+)-N removal in aquaculture wastewater.

关键词： ammonia nitrogen removal Single-atom iron Non-noble metal catalyst Aquaculture wastewater

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