Preparation, Modification And Adsorption Of Pollutants In Water Of Mesoporous Materials

As the global water pollution is becoming more and more sivious, how to removethe pollutants in the water has become a worldwide problem. The pollutants aremainly organic phenol and heavy metal ions in the water. At present, the adsorptionseparateon method is considered to be one of the most effective technical method forremoving those pollutants, And looking for adsorbants for organic phenol and heavymetal ions with high selectivity, high adsorption capacity of adsorbent is becoming ahot spot of research. In this thesis, based on the reviews of the crystal structure,synthetic principle, preparation and modification method, and the actual applicationprospect of SBA-15, as well as the mineral composition, crystal structure, thepractical application of palygorskite, the following work has been done:(1) SBA-15and its modified compounds (including SBA-15-G0, SBA-15-G1,SBA-15-G2, etc) were prepared by graft copolymerizationon using hydrothermalmethod. They were charachterized by the methods of elemental analysis, IR,thermogravimetric analysis, scanning electron microscope (SEM) and transmissionelectron microscopy (TEM)(2) The adsorption capacity of SBA-15and SBA-15modified productson for thep-nitrophenol, hydroquinone,-naphthol, catechol, lead, copper and nickel ions werestudied. Compared with SBA-15, SBA-15modified products have a better effect.(3) Detailed investigation of the adsorption properties of SBA-15-G1onp-nitrophenol, hydroquinone, lead, nickel and copper ions was carried out. Theoptimum pH, the best adsorbent dosage, oscillatory time, the adsorption kinetics andadsorption isotherm were deteminded, which shows that SBA-15-G1has a betteradsorption effect on p-nitrophenol, hydroquinone, lead, nickel and copper ions.(4) Polymer modified porlygorskite(PGS) products(including PGS-G0, PGS-G1,PGS-G2, etc.) were prepared by using the method of graft copolymerizationon.Theelemental analysis, IR, thermogravimetric analysis, scanning electron microscope(SEM) and transmission electron microscopy (TEM) characterization were used toexplain these products.(5) The adsorption capacity of PGS and modified PGS products on the p-nitrophenol, hydroquinone,-naphthol, catechol, and lead, copper and nickel ionswere studied. Compared with PGS, modified PGS have a better adsorption capacityfor these pollutants.(6) Adsorption behavior of PGS-G2for p-nitrophenol, hydroquinone and lead ionswas investigated. The optimum pH, the best adsorbent dosage, oscillatory time, theadsorption kinetics and adsorption isotherm were deteminded, which shows thatPGS-G2has a better adsorption effect for p-nitrophenol, hydroquinone and lead ions.(7) Rhodanine modified palygorskite was synthesized using the method ofhydrothermal cyclization. It has a better adsorption for copper ions. The optimum pH,the best adsorbent dosage, oscillatory time, the adsorption kinetics and adsorptionisotherm were deteminded. Research indicates that rhodanine modified PGS hascertain adsorption capacity for copper ions.