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Henan’an, China

Wang X.,Henan UniversityHenan | Wang X.,Henan University | Lv X.,Henan UniversityHenan | Zhang B.,Henan UniversityHenan | And 2 more authors.
Journal of Chemical Engineering of Japan

Polyaspartic acid/diethylenetriamine (PASP/DETA) graft copolymer was synthesized by urea, maleic anhydride and diethylenetriamine and its performance was evaluated by the static scale inhibition method. Due to the intramolecular hydrogen bonds of the side chains, the seven-member heterocycles were formed in graft copolymers. The results showed that the graft copolymers possessed improved scale inhibition performance against Ca3(PO4)2compared with PASP. The scale inhibition efficiency was close to 100% against Ca3(PO4)2and CaCO3, when the concentration of PASP/DETA was 15 mg/L and 6 mg/L, respectively. Meanwhile, its scale inhibition performance was studied in different solution pH and temperature. The CaCO3 and Ca3(PO4)2 crystal turned into irregular shapes with the introduction of PASP/DETA in the solution, which was observed by scanning electron microscopy. © 2015 The Society of Chemical Engineers, Japan. Source

Li H.Q.,Henan UniversityHenan | Si L.X.,Henan UniversityHenan
Material Science and Environmental Engineering - Proceedings of the 3rd annual 2015 International Conference on Material Science and Environmental Engineering, ICMSEE 2015

Kaifeng City, surrounded by sand, was greatly endangered by sandstorms especially in the spring because the northwest wind blew throughout the year in the Northern Song dynasty. For this purpose, some measures were taken to improve the environment, such as planting trees, sprinkling water on the streets, greening streets, cleaning ditches, and excavating lakes. These measures can serve as a reference for present-day urban environmental regulation. © 2016 Taylor and Francis Group, London. Source

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