title: A novel polyaspartic acid derivative with multifunctional groups for scale inhibition application.
abstract: Polyaspartic acid is a green biodegradable antiscalant and widely applied in water treatment field. However, its scale inhibition efficiency is not prominent, especially for calcium orthophosphate. So we introduced acylamino and hydroxyl groups simultaneously to prepare a novel polyaspartic-acid derivative (PASPTU) with multifunctional groups by the reaction of polysuccinimide with threonine and urea. The graft copolymer was analyzed by using nuclear magnetic resonance, gel permeation chromatography, thermogravimetric analyzer and Fourier transform infrared spectroscopy. Its scale inhibition performance for calcium orthophosphate, calcium sulfate and calcium carbonate was evaluated. The findings showed that the scale inhibition rates of the graft copolymer reached up to 100% for calcium orthophosphate, 100% for calcium sulfate and 91% for calcium carbonate at certain dosages. The findings above showed that the copolymer had excellent scale inhibition efficiency for calcium salts in water treatment processes.
authors.affiliation: a School of Chemical Engineering and Environment , Beijing Institute of Technology , Beijing , People's Republic of China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: a School of Chemical Engineering and Environment , Beijing Institute of Technology , Beijing , People's Republic of China.
authors.forename: Hongquan
authors.initials: H
authors.lastname: Yin
authors.affiliation: a School of Chemical Engineering and Environment , Beijing Institute of Technology , Beijing , People's Republic of China.
authors.forename: Qingshan
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: b Anhui Sealong Biotechnology Co., Ltd , Bengbu , People's Republic of China.
authors.forename: Yunzheng
authors.initials: Y
authors.lastname: Li
authors.affiliation: a School of Chemical Engineering and Environment , Beijing Institute of Technology , Beijing , People's Republic of China.
authors.forename: Pengjun
authors.initials: P
authors.lastname: Yao
authors.affiliation: a School of Chemical Engineering and Environment , Beijing Institute of Technology , Beijing , People's Republic of China.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Huo
mesh_terms: D002119:Calcium Carbonate; D002133:Calcium Sulfate; D010455:Peptides / Q000737:chemistry*; D011108:Polymers; D017550:Spectroscopy, Fourier Transform Infrared; D062065:Wastewater
chemical_list: D002119:Calcium Carbonate; D002133:Calcium Sulfate; D010455:Peptides; D011108:Polymers; D062065:Wastewater; C017645:polyaspartate
keywords: Graft copolymer; calcium orthophosphate; polyaspartic acid; scale inhibition; urea