Evaluating the Efficiency of Cadmium Removal by Alginate Hydrogels from Water Using 5,7-Dibromo-8-hydroxyquinoline as a Complexing Reagent  

作　　者：Abhijit B.Phalke Varuna S.Watwe Sunil D.Kulkarni Preeti S.Kulkarni 

机构地区：[1]Post Graduate and Research Center,Department of Chemistry,MES Abasaheb Garware College,Pune 411004 Maharashtra,India [2]Affiliated with Savitribai Phule Pune University(Formerly University of Pune),Pune 411007 Maharashtra,India

出　　处：《Precision Chemistry》2023年第9期538-547,共10页精准化学（英文）

摘　　要：Cadmium toxicity in wastewater is a rising concern due to industries like batteries,metallurgy,electroplating,plastic stabilizers,and pigments.The quantitative detection of Cd^(2+)and its remediation from wastewater samples are of major concern from an environmental point of view.In the present work,an effective spectrophotometric method has been reported using 5,7-dibromo-8-hydroxyquinoline(DBHQ)as a complexing agent for Cd^(2+).This method has advantages like using recyclable,less toxic solvents and easy sample preparation.The limit of detection,limit of quantification,and sensitivity of the proposed method were found to be 33.30,36.70 mg L^(−1),and 2×10^(−3),respectively.The DBHQ method was validated using atomic absorption spectroscopy,and the recovery percentage was more than 98%.These results indicate that DBHQ can be effectively used for monitoring Cd^(2+)in aqueous systems.The method developed was further employed for monitoring Cd^(2+)adsorption on calcium alginate(AL)hydrogels.Batch adsorption studies were done to optimize parameters of Cd^(2+)removal using AL hydrogels,and the data obtained were used for kinetic and thermodynamic studies.Kinetic studies indicated that the pseudo-first-order model showed better fitting,and thermodynamic studies showed Freundlich-like adsorption.The maximum adsorption capacity of Cd^(2+)on AL hydrogels was found to be 56.45 mg g^(−1).The validation studies of DBHQ were performed using statistical analysis methods like t-tests and one-way variance.

关 键 词：cadmium toxicity 5 7-dibromo-8-hydroxyquinoline spectrophotometric method adsorption studies wastewater remediation calcium alginate hydrogels 

分 类 号：O64[理学—物理化学]