Study On Surface Grafting Modified Loess And Its Adsorption Behaviours

With the development of economy and the increase of population, water pollution has brought more and more serious environmental and ecological problems, which affects the human health, economic and social sustainable development. Therefore, how to effectively treat the industrial waste is very urgent. At present, many methods have been used for industrial waste water treatment, the research and application on source abundant natural materials as an adsorbent to deal with wastewater has become a hot spot. Loess is a kind of abundant resources, nontoxic,no secondary pollution, and cheap accessible green silicate mineral water treatment materials. In this paper, the loess can be as a raw material to prepare a functional polymer adsorbent material through surface grafting modification for treatment wastewater, It is our desire for low cost, high adsorption activity, no secondary pollution of the adsorbent. The paper consists of following parts.First, it introduces all kinds of clay and surface modification methods, surface modification of clay were reviewed the research progress in wastewater treatment, and summarizes the polymer modification and application of loess.Second, acidification of the loess as a raw material, KH-570 was carried out on the loess surface grafting modification, the introduction of carbon double bonds in the loess surface. Then with Sodium p-Styrene Sulfonate and acrylamide as monomer in the loess surface of graft copolymerization reaction, the loess surface graft copolymer LC-P(AM-SSS) was achieved successfully. Furthermore, the obtained LC-P(AM-SSS) was characterized by FT-IR, SEM, TG and other methods of characterization. Results indicate that the loess surface successfully grafted Sodium p-Styrene Sulfonate and acrylamide.Third, this paper explored the adsorption ability of LC-P(AM-SSS) for MB and BF, analysied the effects of amount of adsorbent, initial concentration, pH and time on adsorption, and discussed the adsorption kinetics and isotherms of LC-P(AM-SSS). The results show that: The decolorization rate of MB got to 98.56%, and the decolorization rate of BF got to 98.4%. The adsorption isotherms of MB and BF well fit with the Langmuir isotherm. The adsorption kinetics of MB and BF well fit with the pseudo-second order kinetics model.Fourth, acidification of the loess as raw material, KH-570 was carried out on the loess surface grafting modification, the introduction of carbon double bonds in the loess surface. Then, select the functional monomer, acrylic acid(AA) and N-vinyl-pyrrolidone(NVP) in the loess surface graft copolymerization, the loess surface graft copolymer was successfully achieved(LC-PAVP). Furthermore, the obtained LC-PAVP was characterized by FT-IR, SEM, TG and other methods of characterization. The results show that, he loess surface successfully grafted with AA and NVP.Fifth, this paper explored the adsorption ability of LC-PAVP for Pb(?) and Cu(?), analysied the effects of amount of adsorbent, initial concentration, pH, temperature and time on adsorption, and discussed the adsorption kinetics and isotherms of LC-PAVP. The results show that: the removal rate of Pb(?) got to 99.49%, and the removal rate of Cu(?) got to 97.29%. The adsorption isotherms of Pb(?) and Cu(?) be well fitted with the Freundlich isotherm. The adsorption kinetics of Pb(?) and Cu(?) be well fitted with the pseudo-second order kinetics model.