采用环氧氯丙烷(ECH)接枝法,将聚乙烯亚胺(PEI)引到麦秸杆(MWS)表面,制得改性阳离子吸附剂PEI-MWS。红外光谱(FT-IR)分析、定量元素分析显示,PEI负载在麦秸秆表面。研究了时间、温度以及溶液pH对PEI-MWS吸附性能的影响。结果表明:在pH为3.4,浓度为0.8g/L的条件下,吸附效果最好。303K时的吸附量达到30.0mg/g。吸附平衡过程符合Koble-Corrigan模型,吸附动力学可用准二级动力学模型来拟合。热力学结果表明,吸附过程是自发的、熵增的过程。改性麦秸杆在0.01mol/L NaOH中再生效果最好,可作为一种良好的吸附剂。
Polyethyleneimine (PEI) was introduced to the surface of wheat straw (MWS) by epichlorohydrin (ECH) grafting method to prepare modified cationic adsorbent PEI-MWS.FT-IR and quantitative element analysis results showed that PEI was successfully loaded on the surface of wheat straw.The effects of time,temperature and pH on the adsorption properties of PEI-MWS were studied.The results indicated that,when the pH was 3.4 and the concentration was 0.8g/L,the adsorption effect was optimal and the adsorption capacity reached to 30.0mg/g at 303K.The adsorption equilibrium process conformed to the koble Corrigan model,and the adsorption kinetics could be fitted by the pseudo-second-order kinetic model.Thermodynamic results revealed that the adsorption process was a spontaneous and entropy increasing process.The regeneration effect of modified wheat straw reached to the maximum of 0.01mol/L NaOH,which demonstrated that it could be used as a good adsorbent.
[1] Howarth R W,Marino R.Nitrogen as the limiting nutrient for eutrophication in coastal marine ecosystems:evolving views over three decades[J].Limnology & Oceanography,2006,51:364-376.
[2] Wu B L,Wan J,Zhang Y Y,et al.Selective phosphate removal from water and wastewater using sorption:process fundamentals and removal mechanisms[J].Environmental Science & Technology,2020,54:50-66.
[3] 郑颖.水中总磷测定值影响因素探析[J].环境与发展,2020,32(10):128-130.
[4] 钟静.水中总磷监测分析常用方法探讨[J].冶金管理,2019(5):87-88.
[5] 崔蒙蒙.水铁矿对含磷废水的吸附性能及机理分析[D].苏州:苏州科技大学,2016.
[6] Ye H P,Chen F Z,Sheng Y O,et al.Adsorption of phosphate from aqueous solution onto modified palygorskitss[J].Separation and Purification Technology,2006,50(3):283-290.
[7] Mpatani F M,Han R P,Aryee A A,et al.Adsorption performance of modified agricultural waste materials for removal of emerging micro-contaminant bisphenol A:a comprehensive review[J].Science of the Total Environment,2021,780:146629.
[8] Tang Y K,Tong Z F,Wei G T,et al.Removal of phosphate from aqueous solution with modified bentonite[J].Chinese Journal of Process Engineering,2006,6(2):197-200.
[9] 杨蒙蒙.改性麦秸秆和碳纳米管对水中典型有机污染物的吸附[D].郑州:郑州大学,2019.
[10] 缪锦芳.改性麦秸秆对硝酸根和磷酸根的吸附研究[D].郑州:郑州大学,2017.
[11] 韩攀,李延虎,鲁艺珍,等.改性麦秸秆对溶液中亮绿的吸附研究[J].化工新型材料,2018,46(3):207-209.
[12] Han R P,Zhang L J,Song C,et al.Characterization of modified wheat straw,kinetic and equilibrium study about copper ion and methylene blue adsorption in batch mode[J].Carbohydrate Polymers,2010,79:1140-1149.
[13] 周少锋,闫慧敏,刘亚青.聚多巴胺/聚乙烯亚胺交联修饰氧化石墨烯填充环氧树脂涂料的制备及防腐性能[J].合成材料老化与应用,2021,50(2):48-52.
[14] Sadaf S,Bhatti H N,Arif M,et al.Adsorptive removal of direct dyes by PEI-treated peanut husk biomass:box-Behnken experimental design[J].Chemistry and Ecology,2014,30:52-65.
[15] Shang Y,Zhang J H,Wang X,et al.Use of polyethylenemine modified wheat straw for adsorption of congo red from solution in batch mode[J].Desalination and Water Treatment,2016,57(19):8872-8883.
[16] 尚瑜.PEI改性麦秸秆对刚果红铜离子和磷酸根的吸附研究[D].郑州:郑州大学,2015.
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