Sorption of phthalic acid esters and low-molecular weight acid on carbon nanotubes
SUN Tian-hang1, SHEN Xiao-fang1, ZHANG Zhan-en1,2, CHEN Shu-min1, LIU Dan1, XU Shu-yi1, CHEN Yong-hong1, ZHANG Meng3, GUO Xiao-ying4
1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215000, China; 2. Innovation Center of Water Treatment Technology and Material, Suzhou University of Science and Technology, Suzhou 215000, China; 3. College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; 4. School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
Abstract：Phthalic acid (PA) and diethyl phthalate (DEP) were the target pollutants, and carbon nanotubes (CNTs) were used as sorbents. Based on the sorption site energy distribution theory, the competitive and displacement sorption of DEP by PA on CNTs were analyzed by the single- and dual-solute sorption experiments under different pH conditions. Sorption intensity of DEP on CNTs was stronger than that of PA under specific pH condition. For the sorption of DEP on CNTs, the dispersion stability of CNTs affected by the solution pH was the dominant factor to the sorption process. For the sorption of PA, both of the surface charge of CNTs and the dissociation degree of PA affected by solution pH, impacted the sorption process. In the dual-solute system, PA had competition and displacement effects on the sorption of DEP by CNTs. Under different pH conditions, the competition and displacement strength of PA to the sorption of DEP on CNTs was related to the dispersion stability of CNTs and the degree of dissociation of PA. Analysis based on site energy distribution showed that the number of available low-energy sorption sites increased although the addition of PA caused a significant decrease in the number of available high-energy sorption sites for DEP on CNTs.
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