Facile copolymerization synthesis of vinylimidazole/dibromodecane/vinylpyridine polymer with high capacity for selective adsorption of nitrate from water

被引：5
作者：
Hu, Wei [1 ]
Wang, Lin [1 ]
Zhu, Kai [1 ]
Wu, Fenqi [1 ]
Qiao, Huayi [1 ]
Li, Yan [1 ,2 ]
机构：
[1] Jilin Univ, Key Lab Groundwater Resources & Environm, Minist Educ, Changchun 130021, Peoples R China
[2] 2519 Jiefang Ave, Changchun, Peoples R China
来源：
JOURNAL OF WATER PROCESS ENGINEERING | 2022年 / 49卷
基金：
中国国家自然科学基金;
关键词：
Nitrate adsorption; Adsorption selectivity; Vinylimidazole; Vinylpyridine; Wastewater treatment; ANION-EXCHANGE; REMOVAL; RESINS; POLY(4-VINYLPYRIDINE); CONTAMINATION; PERFORMANCE; ADSORBENT; CARBON; COPPER; BATCH;
D O I：
10.1016/j.jwpe.2022.103052
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this study, a novel polymer 1-vinylimidazole/1,10-dibromodecane/4-vinylpyridine polymer (VDV) with high nitrate adsorption capacity and selectivity was synthesized using a facile copolymerization method. The maximum nitrate adsorption capacity of VDV reached 52.6 mg N/g, which was 54.17 % and 52.42 % higher than those of 1-vinylimidazole/1,10-dibromodecane and 4-vinylpyridine/1,10-dibromodecane, respectively. For the co-existing anions interference, dibromodecane improved the hydrophobicity of VDV; thereby, reducing the sulfate interference on nitrate adsorption that the nitrate adsorption capacity in sulfate (250 mg/L)/nitrate (56.4 mg N/L) binary solution still reached 77.2 % of the control group (56.4 mg N/L of nitrate alone). When sulfate concentration increased from 150 to 350 mg/L in sulfate/nitrate (56.4 mg N/L) binary solution, nitrate adsorption capacity dropped from 88 % to 55.2 % of the control group. Meanwhile, the adsorption selectivity (K-e/c) for nitrate was higher than 1 (K-e/c = 1.3-2.6), indicating that VDV still has adsorption affinity to nitrate in companion with a high concentration of sulfate. For chloride and bicarbonate (150-350 mg/L), they almost had no interference with nitrate adsorption. Besides, the adsorption process is preferably fitted with the pseudo-second-order kinetics (R-2 = 0.992) and the Freundlich model (R-2 > 0.99), indicating that the process is multilayer chemisorption. After five times recycle, nitrate adsorption capacity maintained above 91 % of that of the first cycle, indicating the stable reusability of VDV, and it exhibited excellent nitrate adsorption from real wastewaters. Therefore, with a conspicuous enhancement of adsorption capacity and selectivity for nitrate, VDV is promising in nitrate removal from waters.
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页数：10
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