%0 Journal Article
%T Adsorption of Monobutyl Phthalate from Aqueous Phase onto Two Macroporous Anion-Exchange Resins
%A Zhengwen Xu
%A Yunlong Zhao
%A Jing Shi
%A Jiangang Lu
%A Ling Cheng
%A Mindong Chen
%J Journal of Chemistry
%D 2014
%I Hindawi Publishing Corporation
%R 10.1155/2014/689734
%X 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. 1. 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]. Recently, many PAMs have been detected in surface water, sea water, and landfill leachate [3]. Previous research proved that some PAMs have greater solubility than corresponding PAEs, especially for monomethyl phthalate (MMP, 3721£¿mg/L), monobutyl phthalate (MBP, 409£¿mg/L), and mono-ethyl-hexyl-phthalate (MEHP, 1.85£¿mg/L). Thus, some polluted aquatic environment may contain high concentration of PAMs [4, 5]. For instance, Jonsson found that, in landfill leachate, MBP appeared at a concentration of 2500£¿¦Ìg/L that was much higher than that of dibutyl phthalate (DBP) (50£¿¦Ìg/L) [6]. Therefore, as a new type of organic pollutants, how to effectively remove PAMs from aqueous solution is an important issue. Many previous studies have reported that PAMs can be removed from aqueous environment through different methods, such as activated sludge process [7] and adsorption [8, 9]. In the active sludge process, PAMs can be further broken down to phthalic acid, benzoic acid, and finally carbon
%U http://www.hindawi.com/journals/jchem/2014/689734/