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Adsorption of Cu2+ by Crosslinked Graft Copolymers of Starch
Received:August 20, 2020    Click here to download the full text
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Author NameAffiliation
Cai Xue College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China
Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper, Key Lab of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Xi'an, Shaanxi Province, 710021, China
National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China 
Lin Tao College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China
Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper, Key Lab of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Xi'an, Shaanxi Province, 710021, China
National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China 
Zhang Neng College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China
Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper, Key Lab of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Xi'an, Shaanxi Province, 710021, China
National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China 
Wei Xiaoyao College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China
Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper, Key Lab of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Xi'an, Shaanxi Province, 710021, China
National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China 
Yin Xuefeng College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China
Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper, Key Lab of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Xi'an, Shaanxi Province, 710021, China
National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China 
 
Abstract:With the use of acrylic acid (AA) as a monomer, humic acid (HA) and starch as raw materials, potassium persulfate (KPS) as initiator, and N,N-dimethylacrylamide (MBA) as a cross-linking agent, AA/HA/Starch graft copolymer was prepared and characterized by SEM and FT-IR. The effects of temperature, adsorption time, adsorbent dosage, pH value and Cu2+ initial concentration of the solution on the adsorption performance of the crosslinked graft copolymer were also investigated. The results showed that the Cu2+ adsorption capacity of the AA/HA/Starch graft copolymer increased firstly and then decreased with increasing adsorbent dosage and the initial pH value of Cu2+ solution. With the increase of Cu2+ initial concentration and the extension of adsorption time, the adsorption amount of Cu2+ increased rapidly and then stabilized. And it decreased slightly with the increase of temperature. At pH value of 5.5, temperature of 298 K, adsorbent dosage of 50 mg, adsorption time of 125 min, and 100 mL Cu2+ solution with Cu2+ initial concentration of 100 mg/L, the Cu2+ adsorption capacity of the crosslinked graft copolymer was 238 mg/g. The adsorption of Cu2+ by the adsorbent followed the pseudo-second-order kinetic equation and Langmuir isothermal adsorption model, and the adsorption was attached to monolayer chemical adsorption. This study proved that AA/HA/Starch graft copolymer could be used as an efficient adsorbent for the removal of harmful and toxic metal cations such as Cu2+ from industrial wastewater.
keywords:humic acid  starch  acrylic acid  adsorption materials  Cu2+
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