摘要
为综合利用农林废弃物,以白果壳为植物模板、羟基磷灰石(HAP)为改性材料,制备了白果壳遗态HAP/C复合材料(PBGC-HAP/C-G),并通过X射线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)和扫描电镜(SEM)等对其进行了表征,同时研究了溶液pH、初始浓度、吸附剂投加量等对其去除水中氨氮的影响。结果表明,PBGC-HAP/C-G是一种大孔材料,孔径主要介于35~200μm之间。在溶液pH=5时,吸附效果最佳;吸附剂投加量的增加有利于氨氮的去除;粒径大小不是影响吸附效果的主要因素。准二级动力学模型和Freundlich等温吸附模型能很好地描述该吸附过程,吸附过程以化学吸附为主。在氨氮初始浓度为20、50、100 mg·L^-1时,拟合计算得到的理论平衡吸附量分别为0.45、1.10、2.15 mg·g^-1,与实验测定值0.46、1.15、2.18 mg·g^-1相近,可见PBGC-HAP/C-G可用作去除氨氮的吸附剂。
For the comprehensive utilization of forestry and agricultural residues, a porous biomorph-genetic composite of hydroxyapatite/carbon(PBGC-HAP/C-G)was prepared with a ginkgo shell bio-template and characterized using X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy. The effects of the solution pH, initial concentration, and adsorbent dosage on the adsorption of ammonia nitrogen from water were investigated. The results showed that the PBGC-HAP/C-G adsorbent was a macroporous material with a main pore size of approximately 35~200 μm. The highest absorption efficiency was attained at the solution pH of 5. The increase in the adsorbent dosage was beneficial to the removal of ammonia nitrogen, but the particle size was not a major influencing factor.The pseudo-second-order kinetic model and the Freundlich isotherm fitted the experimental data well. The removal process was mainly chemisorption. The calculated adsorption capacities at equilibrium were determined to be 0.45, 1.10 mg·L^-1, and 2.15 mg·g^-1 for the adsorption at the initial ammonia nitrogen concentrations of 20, 50 mg·L^-1, and 100 mg·L^-1, respectively, which were very close to the experimental values of 0.46, 1.15 mg·L^-1, and 2.18 mg·g^-1, respectively. PBGC-HAP/C-G can be used as an adsorbent for ammonia nitrogen removal.
作者
阎起明
朱宗强
黄献宁
朱义年
刘杰
何豪
YAN Qi-ming;ZHU Zong-qiang;HUANG Xian-ning;ZHU Yi-nian;LIU Jie;HE Hao(Collaborative Innovation Center for Water Pollution Control and Water Safety in Karsts Area,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541004,China;Bureau of Ecology and Environment of Cenxi,Wuzhou 543200,China)
出处
《农业资源与环境学报》
CAS
北大核心
2020年第2期252-260,共9页
Journal of Agricultural Resources and Environment
基金
国家自然科学基金项目(21707024,41763012,51978188)
广西自然科学基金项目(2018GXNSFAA050044)
广西科技计划项目(桂科AD18126018)
广西创新驱动发展专项(桂科AA17204047)
广西高等学校高水平创新团队及卓越学者计划项目(桂财教函[2018]319号)。
关键词
白果壳
复合材料
羟基磷灰石
吸附
氨氮
ginkgo shell
biomorph-genetic composite
hydroxyapatite
adsorption
ammonia nitrogen
