Adsorption of Monobutyl Phthalate from Aqueous Phase onto Two Macroporous Anion-Exchange Resins

Zhengwen Xu,Ling Cheng,Jiangang Lu,Mindong Chen,Yunlong Zhao,Jing Shi

doi:10.1155/2014/689734

Abstract

As new emerging pollutants, phthalic acid monoesters (PAMs) pose potential ecological and human health risks. In the present study, adsorption performance of monobutyl phthalate (MBP) onto two macroporous base anion-exchange resins (D-201 and D-301) was discussed. It was found that the adsorption isotherms were best fitted by the Langmuir equation while the adsorption kinetics were well described by pseudo-first-order model. Analyses of sorption isotherms and thermodynamics proved that the adsorption mechanisms for DBP onto D-201 were ion exchange. However, the obtained enthalpy values indicate that the sorption process of MBP onto D-301 is physical adsorption. The equilibrium adsorption capacities and adsorption rates of DBP on two different resins increased with the increasing temperature of the solution. D-301 exhibited a higher adsorption capacity of MBP than D-201. These results proved that D-301, as an effective sorbent, can be used to remove phthalic acid monoesters from aqueous solution.

Highlights

Water pollution by phthalic acid esters (PAEs) has attracted increasing attention in recent decades
Previous research proved that some Phthalic acid monoesters (PAMs) have greater solubility than corresponding PAEs, especially for monomethyl phthalate (MMP, 3721 mg/L), monobutyl phthalate (MBP, 409 mg/L), and mono-ethylhexyl-phthalate (MEHP, 1.85 mg/L)
The primary objective of the present study is to find a new method for effective removal of PAMs from aqueous solution

Summary

Introduction

Water pollution by phthalic acid esters (PAEs) has attracted increasing attention in recent decades. They are widely used as plasticizers in the manufacture of polyvinyl chloride [1]. Phthalic acid monoesters (PAMs) as degradation products of PAEs or synthetic intermediates for the preparation of PAEs have attained more attention. They are mutagenic endocrine disrupting compounds, posing the adverse reproductive effects on humans and wildlife equal to PAEs. Some studies have shown that the hydrolytic breakdown products of some PAEs have higher toxicity than PAEs [2]. As a new type of organic pollutants, how to effectively remove PAMs from aqueous solution is an important issue

Objectives

Methods

Conclusion