Preparation Of Polymer/Bentonite Composite And Its Application In Wastewater Treatment

With the rapid development of modern industry, the wastewater discharge pollution problem by many production enterprises is getting worse. The characteristics of heavy metal ions wastewater is valid, lasting, and biological non-degradable. It can accumulate through the food chain resulting in biological organisms, cancer, disability, teratogenic. Printing and dyeing wastewater ingredients are complex, contains poisonous and harmful material can seriously pollute the environment. Therefore, these harmful wastewater treatment appears very urgent, relevant wastewater treatment research has been concerned. Adsorption is one kind of important processing method.Due to strong ion-exchange capacity and large surface area, Bentonite shows strong adsorption, it can be used for wastewater treatment. In order to dramatically improve natural bentonite adsorption ability and expand the application field, this paper prepared two new amphiphilic acrylic acid copolymer/bentonite composite by in-situ polymerization, and researched on its adsorption function for the different types of wastewater (contain metal ions or dye compound aqueous)Firstly, this paper introduced wastewater treatment methods, bentonite modification, the application of their modified products in heavy metal waste and dye wastewater treatment is reviewed. And summarized the problems of current bentonite, organic modify.Secondly, based on sodium base bentonite (NaB) as raw material, the hydrophilic monomer and hydrophobic were dispersed with bentonite in aquous solution and copolymerized by in-situ polymerization. Two kind of new amphiphilic acrylic acid copolymer/bentonite composite were prepared, The copolymer P(MAV)/NaB composite and cross-linked copolymer P(MAVM)/NaB composite. Using infrared spectrometry (FT-IR),X-ray diffraction (XRD), scanning electron microscopy (SEM) instrument analysis methods to study the composition, microstructure, morphology and surface functional group, and so on Thirdly, we have treated the Pb²⁺,Cd²⁺ wastewater using P(MAVM)/NaB as adsorbent. Examine the effect of pH of wastewater, adsorbent dosage, initial concentration of metal ions, adsorption temperature and time on adsorption properties. We have treated the Pb²⁺ wastewater, The optimal condition is as following: pH=5, [Pb²⁺]=50.0 mg/L, P(MAVM)/NaB=0.2 g/L, oscillating 30 min in 25oC. The removal rate reached to 94.40%. We have treated the Cd²⁺ wastewater. The optimal condition is as following: pH=6, [Cd²⁺]=200.0mg/L, P(MAVM)/NaB=1.0g/L, oscillating 60 min in 25°C. the removal rate reached to 89.54%。And its adsorption isotherm and kinetic models were discussed. Adsorption kinetics consistent with quasi-second order kinetic model, adsorption isotherm model was fitted to Freundlich isotherm.Fourthly, we have treated the MB,BF wastewater using P(MAVM)/NaB as adsorbent. Examine the effect of pH of wastewater, adsorbent dosage, initial concentration of metal ions, adsorption temperature and time on adsorption properties. We have treated the MB wastewater, The optimal condition is as following: pH: 6-7, [MB]=20.0 mg/L, P(MAVM)/NaB=0.1g/L, , oscillating 5 min in 25 oC. Under the condition, the decolorization rate reached to 97.73%. We have treated the BF wastewater. The optimal condition is as following: pH: 6-7, [BF]=100.0mg/L, P(MAVM)/NaB=1.0g/L, oscillating 5 min in 25°C. Under the condition, the decolorization rate reached to 95.96%.And its adsorption isotherm and kinetic models were discussed. Adsorption kinetics consistent with quasi-second order kinetic model, adsorption isotherm model was fitted to Freundlich isotherm.In short, the prepared amphiphilic acrylic acid copolymer/bentonite composite were used for dye compounds and the metal ions adsorption. Found to have high adsorption properties, it is expected to be used for different metal ions and dye processing or enrichment...