Cross-linked chitosan/sepiolite composite for the adsorption of methylene blue and reactive orange 16.
Cross-linked chitosan/sepiolite composite was prepared from sepiolite clay and chitosan, and was cross-linked using epichlorohydrin. Among the various weight ratio percentage of chitosan and sepiolite clay composites, CS50SP50 was selected as the best adsorbent for both methylene blue (MB) and reactive orange 16 (RO 16). At an optimum adsorbent dosage of 0.2g/100mL, the effects of initial dye concentration (25-400mg/L) and pH (3-11) on MB and RO 16 adsorption onto CS50SP50 composite were studied. Monolayer adsorption capacities of CS50SP50 composite for MB and RO 16 were 40.986mg/g and 190.965mg/g, respectively at 30°C. Freundlich, Langmuir and Temkin isotherms applied on the adsorption data for both the dyes reveal that data fitted best for Freundlich model. For both the dyes pseudo-second-order kinetics were found to describe the adsorption process better than pseudo-first-order kinetics. The adsorption capacity of CS50SP50 composite for both the dyes was found better compared to previous studies thus making it potentially low-cost adsorbent for removal of both cationic and reactive dyes.
School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia.
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Marrakchi
School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia.
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Khanday
Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia.
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Asif
School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia. Electronic address: chbassim@usm.my.
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Hameed
D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry* / Q000302:isolation & purification; D048271:Chitosan / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry* / Q000302:isolation & purification; D004355:Drug Stability; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D017633:Magnesium Silicates / Q000737:chemistry*; D055595:Mechanical Phenomena; D008751:Methylene Blue / Q000737:chemistry* / Q000302:isolation & purification; D014873:Water Pollutants / Q000737:chemistry* / Q000302:isolation & purification; D018508:Water Purification
D001391:Azo Compounds; D004396:Coloring Agents; D017633:Magnesium Silicates; D014873:Water Pollutants; C483723:reactive orange 16; D048271:Chitosan; C001671:magnesium trisilicate; D008751:Methylene Blue
Adsorption; Methylene blue; Reactive orange 16