Study on adsorption of ammonia nitrogen by iron-loaded activated carbon from low temperature wastewater

被引:127
|
作者
Ren, Zhijun [1 ]
Jia, Biao [1 ]
Zhang, Guangming [1 ]
Fu, Xiaolin [1 ]
Wang, Zhanxin [1 ]
Wang, Pengfei [1 ]
Lv, Longyi [1 ]
机构
[1] Hebei Univ Technol, Tianjin Key Lab Clean Energy & Pollut Control, Sch Energy & Environm Engn, 5340 Xiping Rd, Tianjin 300401, Peoples R China
基金
中国国家自然科学基金;
关键词
Adsorption; Ammonia nitrogen; Activated carbon; Iron modification; Low temperature;
D O I
10.1016/j.chemosphere.2020.127895
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In order to improve the adsorption efficiency of ammonia nitrogen in low temperature wastewater, the modified activated carbon (Fe-AC) was prepared by impregnation-calcination modification of Fe(NO3)(3). The characterization results indicated that the total pore volume, specific surface area and the point of zero charge of activated carbon increased after modification. A better adsorption effect was achieved under neutral condition than under alkaline or acidic condition. The effect of Ca2+ on competitive adsorption of NH(4)(+ )was greater than that of Na+ when both cations were present. Pseudo-first-order kinetic model was confirmed to be consistent with Fe-AC adsorption kinetic data, and Langmuir model was consistent with adsorption isotherm data. The adsorption thermodynamics demonstrated that the ammonia nitrogen adsorption process by Fe-AC was spontaneous and low-temperature was helpful to improve the adsorption capacity. The mechanism of adsorption of ammonia nitrogen by Fe-AC was the comprehensive effect of physical adsorption and chemical adsorption, which was the essential reason for improving the adsorption efficiency of ammonia nitrogen by Fe-AC at a low temperature. This research offered a new way for the modification of activated carbon and a new method for the removal of ammonia nitrogen at a low temperature. (C) 2020 Elsevier Ltd. All rights reserved.
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页数:10
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