Preparation And Application Of Cheap Natural Polymer Adsorbent

Along with the development of industry, the water pollution has become more and more serious. It affects human’s production and activity. As being widely distributed and environmentally friendly, natural polymers had been paid attention in past decades. Based on the forefront of polymer water treatment agent, in order to increase water treatment effeciency and reduce the production cost of adsorbent, using cheap natural polymer as a water treatment agent, preparation polymer adsorbent by the simple and effectively method with the cheap resources of soybean and loess as raw materials. And applied to remove heavy metal ions and dye wastewater, in order to obtain high adsorption property, low cost, no secondary pollution and renewable polymer adsorbent.Firstly, this paper introduces the main source of water pollutants and the method of water treatment, the applications of natural and waster material in wastewater treatment, And preparation of adsorbent by cheap natural polymer as the raw material.Secondly, the soybean hulls residue adsorbent (SHR) was extracted from residue of soybean milk preparation by non-toxic and edible eluent. Furthermore, the obtained SHR was characterized by FT-IR, XPS, XRD, SEM and other characterization method to analyze composition and structure. As soybean hulls residue adsorbent (SHR) was comprised of natural polymer, such as lignin, cellulose and glycoprotein. It is a kind of typical biocompatible, non-toxic and edible natural polymer.Thirdly, the adsorption ability of SHR for Pb(Ⅱ), methylene blue and mountain green was investigated. The adsorption parameters such as initial concentration of lead, pH value, adsorbent dosage, contact time and temperature, Along with analyzing adsorption kinetic and isotherm parameters were investigated. The removal rate of Pb(II), MB and MG got to99.11%,97.0%and98%respectively. The adsorption isotherms and kinetics of Pb(Ⅱ), MB and MG were well fit with the Langmuir model and pseudo-second order kinetics model, respectively.Fourthly, the Xanthation loess clay adsorbent (XLC) was preparated by modification with CS2. Furthermore, the obtained XLC was characterized by FT-IR, TG, XRD and SEM to analyze composition and structure. Finally, the adsorption ability of XLC for Cu(II) and mountain green was investigated. The result showed that the removal rate of Cu(II) got to99.4%at room temperature and the adsorption capacity got to307.1mg/g. The adsorption isotherms and kinetics of XLC can be well fit with the Langmuir model and pseudo-second order kinetics model, respectively. But for MG the removal rate got to99.4%and the adsorption capacity got to968.8mg/g. The adsorption can be well fit with the Freundlich model and pseudo-second order kinetics model, respectively.In summary, polymer adsorbent was extracted and modified from Soybean hulls residue and loess by simple method and applied to treatment wastewater. Soybean hulls residue is a kind of typical biocompatible, non-toxic and edible natural polymer, and can be used as an antidote in emergency, especially in cases of mass poisoning by heavy metal. The loess is a widely distributed natural material that has extensive sources, the loess adsorbent exhibited excellent adsorption ability for heavy metal ions and dyes, which was very useful.