摘要
以聚丙烯酰胺型高吸水树脂为吸附剂,研究不同粒径高吸水树脂吸附时间、初始质量浓度、用量对水中氨氮的影响及吸附特性,并对吸附前后高吸水树脂样品进行傅里叶红外光谱分析(FT-IR)表征。结果表明:4种粒径聚丙烯酰胺型高吸水树脂对NH+4的吸附符合准二级动力学模型,Freundlich等温吸附方程能很好地描述氨氮在高吸水树脂上的吸附行为。粒径大小对吸附平衡时的吸附量有显著影响(P<0.05),其中粒径L1(4 mm<d≤6 mm)的高吸水树脂平衡吸附量要显著高于粒径M(0.85 mm<d≤1.6 mm)和L(1.6 mm<d≤4 mm)的,粒径L1(4 mm<d≤6 mm)的吸附效果最好。随着高吸水树脂用量增加,4种粒径高吸水树脂氨氮去除率均提高,而单位吸附量减少,适宜高吸水树脂用量为0.5 g。FT-IR分析表明高吸水树脂官能团的化学吸附及离子交换对于NH+4的吸附固定起重要作用。综合吸附量和去除率,粒径L1(4 mm<d≤6 mm)的聚丙烯酰胺型高吸水树脂,在NH+4的初始质量浓度为2.5~7.5 mg·L^-1的水体中用量为2 g·L^-1,对氨氮具有较高的吸附量且能土壤还田。这些数据应用于污水除氮、富营养化水体治理及土壤修复时可以作为粒径控制的参考值。
Using polyacrylamide type Super Absorbing Polymer(SAP)as adsorbent,the effect of adsorption time,initial concentration and dosage of different particle size SAP on ammonia nitrogen in water and adsorption characteristics were studied,and the structure of SAP was analyzed by FT-IR.The adsorption of NH+4 by the four polyacrylamide-type SAP with particle sizes accorded with the quasi-second-order kinetic model,and the Freundlich isotherm adsorption equation described the adsorption behavior of ammonia nitrogen on SAP.The particle size had a significant effect on the adsorption capacity during adsorption equilibrium(P<0.05).The equilibrium adsorption capacity of SAP with particle size L1(4 mm<d≤6 mm)was significantly higher than particle size M(0.85 mm<d≤1.6 mm)and L(1.6 mm<d≤4 mm),the particle size L1(4 mm<d≤6 mm)had the best adsorption effect.With the increase in the amount of SAP,the ammonia nitrogen removal rate of the four particle size SAP all increased,while the unit adsorption capacity decreased.The appropriate amount of SAP was 0.5 g.FT-IR showed that the chemical adsorption and ion exchange of SAP functional groups played an important role in the adsorption and fixation of NH+4.Comprehensive adsorption capacity and removal rate,polyacrylamide type SAP with particle size L1(4 mm<d≤6 mm),the amount of 2 g·L^-1 in water with an initial concentration of NH+4 of 2.5-7.5 mg·L^-1,ammonia nitrogen had a high adsorption capacity and could be returned to the soil.It could be used as a reference value for particle size control when it is applied to sewage nitrogen removal,eutrophic water treatment and soil remediation.
作者
甄倩
王百田
郭利军
Zhen Qian;Wang Baitian;Guo Lijun(Beijing Forestry University,Beijing 100083,P.R.China)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2020年第12期124-128,共5页
Journal of Northeast Forestry University
基金
国家重点研发计划项目(2016YFC0501704)
国家科技支撑项目(2015BAD07B02)。
关键词
高吸水树脂
粒径
吸附动力学
吸附等温线
Super Absorbing Polymer
Particle size
Adsorption kinetics
Adsorption isotherm
