title: Kinetic study of the removal of dimethyl phthalate from an aqueous solution using an anion exchange resin.
abstract: Phthalate acid esters are becoming an important class of pollutants in wastewaters. This study addresses the kinetics of removal of dimethyl phthalate (DMP) using the anion exchange resin D201-OH from an aqueous solution. The effects of various factors on the removal rate and efficiency were investigated. An overall initial removal rate (OIRR) law and a pseudo first-order kinetic (PFOK) model were also developed. The internal diffusion of DMP within the resin phase of D201-OH is the rate-controlling step. Optimization of the particle size and pore structure of the resin D201-OH, the DMP concentration, and the reaction temperature can improve the DMP removal rate. The hydrolysis reaction of DMP catalyzed by D201-OH indicates an overall reaction order of 1.76, a value that is between the first order and the second order. The apparent activation energy of the reaction is 34.6 kJ/mol, which is below the homogeneous alkaline hydrolysis activation energy of 44.3 kJ/mol. The OIRR law can quantify the initial removal rate under different conditions. The results also show that the theoretical DMP removal efficiency predicted by the PFOK model agrees well with the experimentally determined values. Our research provides valuable insights into the primary parameters influencing the kinetic process, which enables a focused improvement in the removal or hydrolysis rate for similar processes.
authors: Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing University of Information Science and Technology, Nanjing, 210044, People's Republic of China, zhouxu3037@sina.com.
authors: Zhengwen
authors: Z
authors: Xu
authors: Ling
authors: L
authors: Cheng
authors: Jing
authors: J
authors: Shi
authors: Jiangang
authors: J
authors: Lu
authors: Weiming
authors: W
authors: Zhang
authors: Yunlong
authors: Y
authors: Zhao
authors: Fengying
authors: F
authors: Li
authors: Mindong
authors: M
authors: Chen
mesh_terms: D000837:Anion Exchange Resins / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods; D006868:Hydrolysis; D007700:Kinetics; D010795:Phthalic Acids / Q000032:analysis / Q000737:chemistry*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D000837:Anion Exchange Resins; D010795:Phthalic Acids; D014874:Water Pollutants, Chemical; C024629:dimethyl phthalate