Nitrogen-doped hydrochar prepared by biomass and nitrogen-containing wastewater for dye adsorption: Effect of nitrogen source in wastewater on the adsorption performance of hydrochar

被引:57
作者
Lin, Zhaohua [1 ,2 ,3 ]
Wang, Ruikun [1 ,2 ,3 ]
Tan, Shiteng [1 ,2 ,3 ]
Zhang, Kai [1 ,2 ,3 ]
Yin, Qianqian [1 ,2 ,3 ]
Zhao, Zhenghui [1 ,2 ,3 ]
Gao, Peng [1 ,2 ,3 ]
机构
[1] North China Elect Power Univ, Dept Power Engn, Baoding 071003, Hebei, Peoples R China
[2] North China Elect Power Univ, Hebei Key Lab Low Carbon & High Efficiency Power G, Baoding 071003, Hebei, Peoples R China
[3] North China Elect Power Univ, Baoding Key Lab Low Carbon & High Efficiency Power, Baoding 071003, Hebei, Peoples R China
基金
中国国家自然科学基金;
关键词
Adsorption; Biomass; Hydrothermal carbonization; N-doped hydrochar; METHYLENE-BLUE; HYDROTHERMAL CARBONIZATION; AQUEOUS-SOLUTION; SEWAGE-SLUDGE; COCONUT SHELL; CONGO RED; BIOCHAR; REMOVAL; EQUILIBRIUM; ACTIVATION;
D O I
10.1016/j.jenvman.2023.117503
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Dye wastewater has become one of the main risk sources of environmental pollution due to its high toxicity and difficulty in degradation. Hydrochar prepared by hydrothermal carbonization (HTC) of biomass has abundant surface oxygen-containing functional groups, and therefore is used as an adsorbent to remove water pollutants. The adsorption performance of hydrochar can be enhanced after improving its surface characteristics through nitrogen-doping (N-doping). In this study, wastewater rich in nitrogen sources such as urea, melamine and ammonium chloride were selected as the water source for the preparation of HTC feedstock. The N atoms were doped in the hydrochar with a content of 3.87%-5.70%, and mainly in the form of pyridinic-N, pyrrolic-N and graphitic-N, which changed the acidity and basicity of the hydrochar surface. The N-doped hydrochar adsorbed methylene blue (MB) and congo red (CR) in wastewater through pore filling, Lewis acid-base interaction, hydrogen bond, and pi-pi interaction, and the maximum adsorption capacities of those were obtained with 57.52 mg/g and 62.19 mg/g, respectively. However, the adsorption performance of N-doped hydrochar was consid-erably affected by the acid-base property of the wastewater. In a basic environment, the surface carboxyl of the hydrochar exhibited a high negative charge and thus an enhanced electrostatic interaction with MB. Whereas, the hydrochar surface was positively charged in an acid environment by binding H+, resulting in an enhanced electrostatic interaction with CR. Therefore, the adsorption efficiency of MB and CR by N-doped hydrochar can be tuned by adjusting the nitrogen source and the pH of the wastewater.
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页数:10
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