title: Adsorption characteristics of malic acid from aqueous solutions by weakly basic ion-exchange chromatography.
abstract: In this study, we reported the effects of temperature, malic acid loading concentration, and resin dose on malic acid adsorption by IRA-67 in batch experiments. The kinetic data well fitted the pseudo-second-order kinetic model. Both the equilibrium and ultimate adsorption slightly decreased with increased temperature from 303 to 323 K at 74.7 g/L malic acid loading concentration. The malic acid adsorption was revealed as a homogeneous adsorbent process by the Langmuir model and film diffusion process at loading concentrations of 18.2-94.5 g/L malic acid by the Boyd plot. The values of effective diffusion coefficient D(i) also increased with the temperature. Based on Eq. (15), the negative values of ΔG° and ΔH° revealed that the adsorption process was spontaneous and exothermic. The negative value of ΔS° also indicated the decrease in the solid-liquid interface randomness at this interface when malic acid is adsorbed by IRA-67.
authors: Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, College of Biotechnology, Logistics Service Group, Tianjin University of Science and Technology, Tianjin 300457, China. Electronic address: qgaoamtf@gmail.com.
authors: Qiang
authors: Q
authors: Gao
authors: Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, College of Biotechnology, Logistics Service Group, Tianjin University of Science and Technology, Tianjin 300457, China.
authors: Chaoqiang
authors: C
authors: Pan
authors: Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, College of Biotechnology, Logistics Service Group, Tianjin University of Science and Technology, Tianjin 300457, China.
authors: Fabao
authors: F
authors: Liu
authors: Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, College of Biotechnology, Logistics Service Group, Tianjin University of Science and Technology, Tianjin 300457, China.
authors: Fuping
authors: F
authors: Lu
authors: Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, College of Biotechnology, Logistics Service Group, Tianjin University of Science and Technology, Tianjin 300457, China.
authors: Depei
authors: D
authors: Wang
authors: Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, College of Biotechnology, Logistics Service Group, Tianjin University of Science and Technology, Tianjin 300457, China.
authors: Jian
authors: J
authors: Zhang
authors: Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, College of Biotechnology, Logistics Service Group, Tianjin University of Science and Technology, Tianjin 300457, China.
authors: Yan
authors: Y
authors: Zhu
mesh_terms: D000327:Adsorption; D002852:Chromatography, Ion Exchange / Q000295:instrumentation / Q000379:methods*; D007475:Ion Exchange Resins; D007700:Kinetics; D008293:Malates / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D007475:Ion Exchange Resins; D008293:Malates; C030298:malic acid