| Glow discharge electrolysis （GDE） is a non-equilibrium plasma with non-Faradic characteristics, which comes from the non-faradic electrochemical process.Plasma is sustained by dc-glow discharge between an electrode and the surface ofelectrolyte. GDE produces various active species, such as hydroxyl radicals, hydrogenperoxide, and electrons, which can be transmitted into the solution in vicinity of theelectrodes and provide rich active intermediates for chemistry reaction in aqueoussolution. GDE can be applied in various fields because of its unique mechanism,simple equipment, harmless of the product, free from pollution to the environmentand occuring in open system.This paper consists of four chapters, studying in detail the application of glowdischarge electrolysis plasma in the synthesis of poly-acrylic acid/humic acid resinvia solution polymerization.Chapter1A reviewReview the plasma production and the properties, also introduce thecharacteristics of the GDE plasma, chemical effect mechanism, non-Faradiccharacteristics in detail. In addition, it makes an introduction of the application ofplasma concerning wastewater treatment, organic synthesis, initiation polymerization,surface modification. Finally, there was a mini-review with reference to progress,absorbing mechanism, effect factors of absorbing property, as well as humic acidsuperabsorbent composite progress.Chapter2Synthesis of composite superabsorbent of poly（acrylic acid sodium）/humic acid by using glow dischargeelectrolysis plasmaPoly （acrylic acid sodium）/humic acid superabsorbent composite waspreparated in the aqueous solution by using glow-discharge electrolysis plasma.Acrylic acid and humic acid were used as raw material and N,N-methylenebisacrylamide as crosslinking agent. The effects of absorbency wereexamined in detail, such as the discharge voltage, crosslinking agent, neutralizationdegree of acrylic acid, polymerization temperature, amounts of sodium humate andacrylic acid. The swelling rate in0.9%sodium chloride solution and the swelling behavior in various pH value solutions were also investigated. The structure andthermal stability of the resulting products were also characterized by Fouriertransform infrared spectroscopy （FTIR） and thermogravimetric analysis （TGA）. Theresult shows that under optimal condition, the superabsorbent has higher waterabsorbency which reaches1152g·g-1for distilled water and good salt-resistancewhich reaches89g·g-1for0.9%sodium chloride solution, the retention rate is about44.3%after800oC.Chapter3Synthesis of composite superabsorbent resin of poly（acrylic acid-co-acryla mide）/sodium humate by using glowdischarge electrolysis plasmaPoly （acrylic acid-co-acrylamide）/sodium humate composite superabsorbentresin was prepared in the aqueous solution by using glow-discharge electrolysisplasma. Acrylic acid, acrylamide and sodium humate were used as raw material andN,N-methylenebisacrylamide as crosslinking agent. The synthesis conditions, such asthe discharge voltage, discharge time, crosslinking agent, amounts of sodium humate,mass ratio of AA/AM, neutralization degree of acrylic acid and polymerizationtemperature were examined in detail. The superabsorbent resin was characterized byFTIR, TGA, respectively. In addition, the influence of pH, sodium chloride solutionon the swelling behavior, reswelling property and water retention were alsoinvestigated. The results showed that at the optimal synthesis conditions, thesuperabsorbent resin has higher water absorbency and salt tolerance, ie1198g·g-1fordistilled water and124g·g-1for0.9%sodium chloride solution.Chapter4Synthesis of composite superabsorbent resin of starchgrafted （poly acrylic acid）/sodium humate by using glow dischargeelectrolysis plasmaStarch grafted （poly acrylic acid）/sodium humate composite superabsorbent resinwas prepared in the aqueous solution via using GDE plasma. To optimize thesynthesis conditions, the discharge voltage, discharge time, crosslinking agent,neutralization degree of acrylic acid, polymerization temperature, amounts of sodiumhumate and the weight ratio of AA to Starch were studied. Moreover, the product wascharacterized by FTIR and TGA. The results indicated that the swelling capacity for pure water and0.9%NaCl solution were found to be862g·g-1and69g·g-1,respectively. |
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