Preparation of Waste-Yeast-Loaded Acrylic Acid/Chitosan Gel for Removing Heavy Metal Ions
At present,most of the bio-sorbent used in the technical research of heavy metal wastewater treatment are powder-like so it is not easy to keep their active structural features,and moreover,is liable to cause considerable loss of solid-liquid separation,consuming more energy,thus their application to the engineering of heavy metal wastewater treatment is restricted.In this paper,a lab experiment was implemented to prepare a sort of bulk-like gel with acrylic acid and chitosan as raw materials by the purple polymerization approach,and the gel was loaded with the waste yeast as a kind of bio-adsorbent.Then the optimal condition of preparing the gel was thereby studied and the results obtained showed that when the ratio of acrylic acid to chitosan was 30:1,N-N methylene bisacrylamide with 15％mass percentage was added as a cross-linking agent,and 1173D with 2％mass percentage was added as a photo-initiator,the composite chitosan hydro-gel prepared containing waste yeast acrylic acid featured a good swelling performance and pore structure,thus the adsorption removal rates of Zn,Cd and Pb ions attaining 27.8％,30.8％and 38.8％,respectively,and after the gel was loaded with the waste,which was embedded in the gel,the removal of Zn,Cd and Pb ions(in low concentration)from water was improved,and with the comprehensive adsorption approach,the rate of Pb removal from Pb2+solution reached 74.8％.In short,the preparing of acrylate-chitosan gel(as the carrier of biological adsorbent)was a simple and rapid embedding molding method,and the bulk-like shape was conducive to subsequent carrier recovery.
biological adsorptionwaste yeastacrylic acidchitosanpurple foreign jointgelheavy metal wastewater
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