蜂巢石负载纳米水合氧化铁吸附氮磷的性能研究  

Adsorption Performance of Nitrogen and Phosphorus by Nano Hydrous Ferric Oxide Loaded with Pumice

作　　者：张晨曦 黄健 张华 张勇 罗涛 奚姗姗 ZHANG Chenxi;HUANG Jian;ZHANG Hua;ZHANG Yong;LUO Tao;XI Shanshan(School of Environmental and Energy Engineering,Anhui Jianzhu University;Anhui Provincial Key Laboratory of Environment Pollution Control and Resource Reuse;Anhui Research Academy of Ecological Civilization:Hefei 230601,China)

机构地区：[1]安徽建筑大学环境与能源工程学院 [2]环境污染控制与废弃物资源化利用安徽省重点实验室 [3]安徽省生态文明研究院,安徽合肥230601

出　　处：《水处理技术》2024年第5期54-59,共6页Technology of Water Treatment

基　　金：国家重点研发计划专项项目(2019YFC0408504)

摘　　要：制备了蜂巢石纳米水合氧化铁复合吸附剂(PUMICE-NHFO),研究投加量、溶液pH和共存阴阳离子对PUMICE-NHFO同时吸附氮和磷性能的影响;采用吸附等温线和吸附动力学模型研究PUMICE-NHFO的吸附特征。结果表明,纳米水合氧化铁成功地负载到蜂巢石上。当PUMICE-NHFO投加量为7.5 g/L、溶液pH为7时,氮和磷被吸附的效果较好,共存阴阳离子与氮和磷竞争吸附位点,降低氮磷吸附效率。PUMICE-NHFO对氮和磷的吸附过程更符合Langmuir吸附等温线模型,氮和磷的最大吸附量分别为3.09 mg/g和5.12 mg/g。准二级动力学模型可准确描述PUMICE-NHFO吸附氮和磷的过程,R~2可分别达到0.992和0.996,吸附过程主要受化学吸附控制。经过5次吸附-解吸循环后,PUMICE-NHFO对氮和磷的吸附容量仍保持在初次吸附容量的68%以上,表现出较好的可重复利用性。In this study,pumice nano hydrous ferric oxide composite adsorbent(PUMICE-NHFO) was prepared to investigate the effects of dosage,solution pH and coexisting anions and cations on the performance of PUMICE-NHFO for simultaneous adsorption of nitrogen and phosphorus.The adsorption characteristics of PUMICE-NHFO were investigated by adsorption isotherms and adsorption kinetic models.The results showed that the nano hydrous ferric oxide was successfully loaded on pumice.The adsorption of nitrogen and phosphorus was more effective when PUMICENHFO was loaded at 7.5 g/L and the pH=7.Coexisting anions and cations competed with nitrogen and phosphorus for adsorption sites and reduced the adsorption efficiency of nitrogen and phosphorus.The adsorption processes of PUMICE-NHFO for nitrogen and phosphorus were more consistent with the Langmuir adsorption isotherm model,and the maximum adsorption amounts of nitrogen and phosphorus were 3.09 mg/g and 5.12 mg/g,respectively.The pseudo-second-order kinetic model could accurately describe the adsorption of nitrogen and phosphorus by PUMICENHFO with R~2 reaching 0.992 and 0.996,respectively,and the adsorption process was mainly controlled by chemisorption.After five adsorptiondesorption cycles,the adsorption capacity of PUMICE-NHFO for nitrogen and phosphorus remained above 68% of the initial adsorption capacity,showing good reusability.

关 键 词：蜂巢石 水合氧化铁 同时吸附 氨氮 磷酸盐 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程]