Synthesis Of Organic/inorganic Super Absorbent And Its Adsorption Properties

The absorbency of peanut shell/poly(acrylic acid)(PS/PAA) superabsorbent which used peanut shelland acrylic acid as materials synthetized by solution polymerization was1343g/g. It was characterized byFourier transform infrared spectrometry (FT-IR) and scanning electron microscope (SEM). The influencesof the peanut shell on the water absorbency of the superabsorbent composites were discussed in the paper.The optimal reaction condition was that the content of peanut shell was10%. The influences of the peanutshell content, pH, initial concentration on the methylene blue (MB) absorbency of the superabsorbentcomposites were also discussed in the paper. The optimal adsorbent conditions were that the peanut shellcontent, pH and MB initial concentration were20%,7and1100mg/g, repectively; and its adsorbency was942mg/g. The isotherms and adsorption kinetics on adsorption of MB onto PS/PAA composite were alsostudied. The equilibrium data fitted very well to the Langmuir isotherm and Pseudo-second-order kinetics.The results showed that the adsorption of MB onto PS/PAA was quickly and spontaneous. PS/PAAcomposite is a very good absorbent.Halloysite-Polyvinyl Alcohol/Poly (acrylic acid-acrylamide)(HNTs-PVA/P (AA-AM))superabsorbent was synthetized with halloysite (HNTs), acrylic acid (AA), acrylamide (AM) and polyvinylalcohol (PVA) as the materials by solution polymerization. It was characterized by FT-IR and SEM, and itsabsorbency was2077g/g. The influences of the halloysite, acrylamide on the water absorbency of thesuperabsorbent composites were discussed in the paper. The optimal reaction conditions were that thecontent of halloysite and acrylamide were10%and60%. The optimal adsorbent conditions were that thehalloysite content, pH, partical size and ionic strength were20%,7, smaller. The isotherms and adsorption kinetics on adsorption of MB onto HNTs-PVA/P (AA-AM) composite were also studied. The equilibriumdata fitted very well to the Langmuir isotherm and Pseudo-second-order kinetics. The results showed thatthe adsorption of MB onto HNTs-PVA/P (AA-AM) was quickly and the spontaneous. AndHNTs-PVA/P(AA-AM) composite was a very good absorbent.Sodium alginate-g-poly(acrylic acid)/halloysite(SA-g-PAA/HNTs) superabsorbent was synthetizedwith halloysite, acrylic acid and sodium alginate as the materials by solution polymerization. It wascharacterized by FT-IR and SEM, and its absorbency was2077g/g. The influences of the halloysite,sodium alginate, on the water absorbency of the superabsorbent composites were discussed in the paper.The optimal reaction conditions were that the content of halloysite and sodium alginate were10%and15%.The optimal adsorbent conditions were halloysite content, pH and initial concentration were20%,5.5and0.02mol/L, repectively; and its adsorbency was263.3mg/g. The isotherms and adsorption kinetics ofadsorption of copper ion onto SA-g-PAA/HNTs composite were also studied. The equilibrium data fittedvery well to the Langmuir isotherm and Pseudo-second-order kinetics. The results showed that theadsorption of copper ion onto SA-g-PAA/HNTs was quickly and the spontaneous. And it is a very goodabsorbent.This paper has two innovations. The first one, three superabsorbent composites were synthetized withpeanut shell, halloysite and sodium alginate as the major materials. With these three materials,superabsorbent composites were part biodegradable and reducing costs. The second one, adsorptionexperiments were done by superabsorbents with three-dimensional polymeric networks. And theadsorption property and kinetics were studied.In this paper, the part biodegradable superabsorbent composites were synthetized with differentmaterials, and the adsorption properties were studied, which can lay a foundation for the application in treating waterwaste.