TY - JOUR
T1 - Methyl orange removal from aqueous solution using goethite, chitosan beads and goethite impregnated with chitosan beads
AU - Munagapati, Venkata Subbaiah
AU - Yarramuthi, Vijaya
AU - Kim, Dong Su
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/8
Y1 - 2017/8
N2 - The adsorption of methyl orange (MO) onto goethite (G), chitosan beads (CSB) and goethite impregnated with chitosan beads (GCSB) as a new and potential adsorbents have been studied. Batch adsorption studies were conducted to evaluate the effect of various parameters such as pH, contact time, initial dye concentration and temperature. The adsorbents are characterized by using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Brunner-Emmet-Teller (BET) analysis, respectively. FTIR results revealed that hydroxyl, amine and carboxyl functional groups present on the surface of adsorbents. Experimental equilibrium data for adsorption of MO was analyzed by the Langmuir, Freundlich and Dubinin-Radushkevich models. The results showed that the best fit was achieved with the Langmuir isotherm equation with maximum adsorption capacities of 55, 73 and 84 mg/g for G, CSB and GCSB, respectively. The pseudo-first-order and pseudo-second-order model equations were used to analyze the kinetic data of the adsorption process and the data was fitted well with the pseudo-second-order kinetic model. The calculated thermodynamic parameters, namely ΔGo, ΔHo and ΔSo showed that adsorption of MO was spontaneous and endothermic in the temperature range 298–338 K. Desorption experiments were carried out to explore the feasibility of regenerating the adsorbent and the adsorbed MO from G, CSB and GCSB were desorbed using 0.1 M NaOH with an efficiency of 91, 94 and 96%, respectively, recovery. Findings of the present study indicated that G, CSB and GCSB can be successfully used for removal of MO from aqueous solution.
AB - The adsorption of methyl orange (MO) onto goethite (G), chitosan beads (CSB) and goethite impregnated with chitosan beads (GCSB) as a new and potential adsorbents have been studied. Batch adsorption studies were conducted to evaluate the effect of various parameters such as pH, contact time, initial dye concentration and temperature. The adsorbents are characterized by using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Brunner-Emmet-Teller (BET) analysis, respectively. FTIR results revealed that hydroxyl, amine and carboxyl functional groups present on the surface of adsorbents. Experimental equilibrium data for adsorption of MO was analyzed by the Langmuir, Freundlich and Dubinin-Radushkevich models. The results showed that the best fit was achieved with the Langmuir isotherm equation with maximum adsorption capacities of 55, 73 and 84 mg/g for G, CSB and GCSB, respectively. The pseudo-first-order and pseudo-second-order model equations were used to analyze the kinetic data of the adsorption process and the data was fitted well with the pseudo-second-order kinetic model. The calculated thermodynamic parameters, namely ΔGo, ΔHo and ΔSo showed that adsorption of MO was spontaneous and endothermic in the temperature range 298–338 K. Desorption experiments were carried out to explore the feasibility of regenerating the adsorbent and the adsorbed MO from G, CSB and GCSB were desorbed using 0.1 M NaOH with an efficiency of 91, 94 and 96%, respectively, recovery. Findings of the present study indicated that G, CSB and GCSB can be successfully used for removal of MO from aqueous solution.
KW - Adsorption
KW - Isotherms
KW - Kinetics
KW - Methyl orange
KW - Temperature
KW - Thermodynamics
UR - http://www.scopus.com/inward/record.url?scp=85019944305&partnerID=8YFLogxK
U2 - 10.1016/j.molliq.2017.05.099
DO - 10.1016/j.molliq.2017.05.099
M3 - Article
AN - SCOPUS:85019944305
SN - 0167-7322
VL - 240
SP - 329
EP - 339
JO - Journal of Molecular Liquids
JF - Journal of Molecular Liquids
ER -