Acid blue 25 adsorption on base treated Shorea dasyphylla sawdust: kinetic, isotherm, thermodynamic and spectroscopic analysis.
The potential of base treated Shorea dasyphylla (BTSD) sawdust for Acid Blue 25 (AB 25) adsorption was investigated in a batch adsorption process. Various physiochemical parameters such as pH, stirring rate, dosage, concentration, contact time and temperature were studied. The adsorbent was characterized with Fourier transform infrared spectrophotometer, scanning electron microscope and Brunauer, Emmett and Teller analysis. The optimum conditions for AB 25 adsorption were pH 2, stirring rate 500 r/min, adsorbent dosage 0.10 g and contact time 60 min. The pseudo second-order model showed the best conformity to the kinetic data. The equilibrium adsorption of AB 25 was described by Freundlich and Langmuir, with the latter found to agree well with the isotherm model. The maximum monolayer adsorption capacity of BTSD was 24.39 mg/g at 300 K, estimated from the Langmuir model. Thermodynamic parameters such as Gibbs free energy, enthalpy and entropy were determined. It was found that AB 25 adsorption was spontaneous and exothermic.
Department of Chemistry, Faculty of Applied Sciences, Universiti Teknologi MARA, 26400, Jengka, Pahang, Malaysia. makmh73@yahoo.com.my
Megat Ahmad Kamal Megat
MA
Hanafiah
Wan Saime Wan
WS
Ngah
Shahira Hilwani
SH
Zolkafly
Lee Ching
LC
Teong
Zafri Azran Abdul
ZA
Majid
D000327:Adsorption; D000880:Anthraquinones / Q000302:isolation & purification*; D004396:Coloring Agents / Q000302:isolation & purification; D053958:Dipterocarpaceae / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D014934:Wood / Q000737:chemistry
C542340:1-amino-9,10-dihydro-9,10-dioxo-4-(phenylamino)-2-anthracenesulfonic acid; D000880:Anthraquinones; D004396:Coloring Agents; D014874:Water Pollutants, Chemical