title: Mechanism of dialkyl phthalates removal from aqueous solution using γ-cyclodextrin and starch based polyurethane polymer adsorbents.
abstract: Phthalate esters have been known as potent endocrine disruptors and carcinogens; and their removal from water have been of considerable concern recently. In the present study, γ-cyclodextrin polyurethane polymer (GPP), γ-cyclodextrin/starch polyurethane copolymer (GSP), and starch polyurethane polymer (SPP) have been synthesized and characterized. Their adsorption efficiencies for the removal of dimethyl phthalate (DMP) and diethyl phthalate (DEP) from aqueous solutions were investigated. The characterization results showed the success of the synthesis. The isotherms were L-type, and both the Langmuir and Freundlich adsorption isotherm gave good fittings to the adsorption data. Adsorption mechanisms suggested that these adsorbents spontaneously adsorb phthalate molecules driven mainly by enthalpy change, and the adsorption process was attributed to multiple adsorbent-adsorbate interactions such as hydrogen bonding, π-π stacking, and pore filling. The results showed that starch and γ-cyclodextrin polyurethane polymer adsorbents have excellent potential as adsorbent materials for the removal of phthalates from the contaminated water.
authors.affiliation: Centre for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, PR China.
authors.forename: Chukwunonso Peter
authors.initials: CP
authors.lastname: Okoli
authors.affiliation: Analytical/Environmental Chemistry Unit, Department of Chemistry, University of Ibadan, Ibadan, Nigeria.
authors.forename: Gregory Olufemi
authors.initials: GO
authors.lastname: Adewuyi
authors.affiliation: Centre for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, PR China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Analytical/Environmental Chemistry Unit, Department of Chemistry, University of Ibadan, Ibadan, Nigeria; National Centre for Nanoscience and Nanotechnology, Chinese Academy of Sciences, Beijing, PR China.
authors.forename: Paul N
authors.initials: PN
authors.lastname: Diagboya
authors.affiliation: Centre for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, PR China. Electronic address: guoqj@igsnrr.ac.cn.
authors.forename: Qingjun
authors.initials: Q
authors.lastname: Guo
mesh_terms: D010795:Phthalic Acids / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011140:Polyurethanes / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D047408:gamma-Cyclodextrins / Q000737:chemistry*
chemical_list: D010795:Phthalic Acids; D011108:Polymers; D011140:Polyurethanes; D047408:gamma-Cyclodextrins; C032279:phthalic acid; D013213:Starch; C023792:gamma-cyclodextrin
keywords: Adsorption; Phthalates; Polyurethane polymer; Starch; γ-cyclodextrin