title: Adsorption mechanism of 2,4-dichlorophenoxyacetic acid onto nitric-acid-modified activated carbon fiber.
abstract: Adsorption by carbon materials is one of the relatively fast methods in present research, which is widely used in emergency events. Activated carbon fiber (ACF) modified by nitric acid (N-ACF) was studied in this research to determine the adsorption performance for 2,4-dichlorophenoxyacetic acid (2,4-D). Subsequently, influence factors, adsorption isotherm models, kinetics and thermodynamic were investigated in a batch system to realize this adsorption. Experimental results showed that ACF modified by 0.1M nitric acid had a better removal ability than 2,4-D. Removal rate of 2,4-D by N-ACF was greatly influenced by pH with the optimum pH at 2. The superiority of the Langmuir isotherm model in describing the adsorption equilibrium was revealed by correlation coefficients R2 (R2≥ 0.997). Furthermore, adsorption kinetics was well described by pseudo-second-order model. The results of thermodynamic showed that adsorption was a spontaneous, endothermic process with randomness increasing. Additionally, surface structure properties of adsorbent were characterized by Scanning electron microscopy, Fourier transform infrared spectroscopy, Specific surface area analysis of Brunauer, Emmett and Teller and Boehm's titration. It turned out that the micropore structure and functional groups on N-ACF all can contribute to the removal of 2,4-D.
authors.affiliation: a Beijing Key Laboratory of Water Resources & Environmental Engineering , China University of Geosciences (Beijing) , Beijing , People's Republic of China.
authors.forename: Qun
authors.initials: Q
authors.lastname: Li
authors.affiliation: b State Key Laboratory of Water Environment Simulation and Pollution Control, School of Environment , Beijing Normal University , Beijing , People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Sun
authors.affiliation: a Beijing Key Laboratory of Water Resources & Environmental Engineering , China University of Geosciences (Beijing) , Beijing , People's Republic of China.
authors.forename: Tianhao
authors.initials: T
authors.lastname: Ren
authors.affiliation: a Beijing Key Laboratory of Water Resources & Environmental Engineering , China University of Geosciences (Beijing) , Beijing , People's Republic of China.
authors.forename: Lin
authors.initials: L
authors.lastname: Guo
authors.affiliation: a Beijing Key Laboratory of Water Resources & Environmental Engineering , China University of Geosciences (Beijing) , Beijing , People's Republic of China.
authors.forename: Zhilin
authors.initials: Z
authors.lastname: Yang
authors.affiliation: a Beijing Key Laboratory of Water Resources & Environmental Engineering , China University of Geosciences (Beijing) , Beijing , People's Republic of China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Yang
authors.affiliation: a Beijing Key Laboratory of Water Resources & Environmental Engineering , China University of Geosciences (Beijing) , Beijing , People's Republic of China.
authors.forename: Hai
authors.initials: H
authors.lastname: Chen
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry*; D000327:Adsorption; D002244:Carbon; D000077482:Carbon Fiber; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D017942:Nitric Acid; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014874:Water Pollutants, Chemical
chemical_list: D000077482:Carbon Fiber; D014874:Water Pollutants, Chemical; D015084:2,4-Dichlorophenoxyacetic Acid; D017942:Nitric Acid; D002244:Carbon
keywords: 2,4-D; Activated carbon fiber; adsorption; mechanism; modification