Using NH_(2)-MIL-125(Ti)for efficient removal of Cr(Ⅵ)and Rh B from aqueous solutions:Competitive and cooperative behavior in the binary system  

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作  者:Lei Zheng Lixia Sun Jiangbo Qiu Junling Song Luyi Zou Yue Teng Yongzhong Zong Hongyan Yu 

机构地区:[1]School of Environmental and Civil Engineering,Jiangnan University,Wuxi 214122,China [2]School of Chemical and Material Engineering,Jiangnan University,Wuxi 214122,China [3]Kunming South Water Co.,Ltd.,Kunming 650501,China [4]Jiangsu Key Laboratory of Anaerobic Biotechnology,Jiangnan University,Wuxi 214122,China

出  处:《Journal of Environmental Sciences》2024年第2期437-450,共14页环境科学学报(英文版)

基  金:supported by the National Natural Science Foundation of China (No.31971508);the National Key R&D Program of China (No.2018YFC1902105);the Fundamental Research Funds for the Central Universities (No.JUSRP22005)。

摘  要:The coexistence of inorganic and organic contaminants is a challenge for real-life water treatment applications.Therefore,in this research,we used NH_2-MIL-125(Ti)to evaluate the single adsorption of hexavalent chromium(Cr(Ⅵ))or Rhodamine B(RhB)in an aqueous solution and further investigate simultaneous adsorption experiments to compare the adsorption behavior changes.The main influencing factors,for example,reaction time,initial concentration,reaction temperature,and pH were studied in detail.In all reaction systems,the pseudo-second-order kinetic and Langmuir isotherm models were well illuminated the adsorption progress of Cr(Ⅵ)and RhB.Thermodynamic studies showed that the adsorption process was spontaneous and endothermic.As compared to the single system,the adsorption capacity of Cr(Ⅵ)in the binary system gradually decreased as the additive amount of RhB increased,whereas the adsorption capacity of RhB in the binary system was expanded brilliantly.When the binary reaction system contained 100 mg/L Cr(Ⅵ),the removal rate of RhB increased to 97.58%.The formation of Cr(Ⅵ)-RhB and Cr(Ⅲ)-RhB complexes was the cause that provided facilitation for the adsorption of RhB.These findings prove that the interactions during the water treatment process between contaminants may obtain additional benefits,contributing to a better adsorption capacity of co-existing contaminant.

关 键 词:ADSORPTION Heavy metal ion Organic dye Simultaneous removal Mechanism studies 

分 类 号:X703[环境科学与工程—环境工程]

 

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