Preparation And Application Of Polymer Modified Attapulgites By Glow Discharge Electrolysis Plasma Initiating

Glow discharge electrolysis is a kind of novel electrochemical process and non-Faraday electrolysis process. The plasma is sustained by a direct current (DC) glow discharge between an electrode and the surface of electrolyte. The conventional electrolysis turned into glow discharge electrolysis when the applied voltage is high enough in aqueous media. There are a lot of energetic species to produce by glow discharge electrolysis, such as H₂O₂,·OH,·H, e^-_aq, HO₂·and so on, and these energetic species can diffuse into the solution around the anode. Therefore, glow discharge plasma can provide rich active intermediates for many kinds of chemical reactions in aqueous solution under ordinary conditions. In this work, glow discharge plasma technology is employed to synthesize polymer materials.This main conclusions are summaried as below:(1) The characteristics of plasma were described. Methods to produce cold plasma and their applications in wastewater treatment, chemical synthesis and polymer materials were also discussed in brief.(2) Amounts of graft polymerization of acrylic acid on attapulgite substrate was carried out and a novel polyacrylic acid/attapulgite composite superabsorbent was prepared by using glow discharge electrolysis plasma initiating, in which acrylic acid and attapulgite were used as raw materials and N,N'-methylenebisacrylamide as the crosslinking agent. Effects of the experimental conditions such as discharge voltage, amounts of crosslinking agent, attapulgite and acrylic acid on the absorbency was discussed in detail and the resulting product was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The resulting superabsorbent has higher water absorbency which reaches 1281g/g for distilled water and 111g/g for 0.9% NaCl solution, respectively.(3) Adsorption of synthesized polyacrylic/attapulgite composite adsorbent to Cu²⁺ was Investigated. It was found that the adsorbent had higher removal effenciey for Cu²⁺ and the adsorption process obeyed pseudo-second-order dynamic equation and Langmuir model.(4) Polyacrylic/acrylamide/attapulgite composite superabsorbent was synthesized through a graft polymerization initiated by glow discharge electrolysis plasma, where acrylic acid and attapulgite were used as raw materials and N, N'-methylenebisacrylamide as the crosslinking agent. Effects of the discharge voltage, amounts of crosslinking agent, attapulgite, the ratio of amounts of acrylic acid to acryylamide and neutralization on the absorbency were discussed in detail. The resulting product was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The prepared superabsorbent has very high water absorbency of 1350g/g for distilled water.(5) Adsorption behavbious of synthesized poly acrylic/acrylamide/attapulgite composite adsorbent were studied to Cu(II) and Pb(II). The adsorption process obeyed pseudo-second-order dynamic equation and Langmuir model.