Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 5, Issue 4, Pages 3780-3791Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2017.07.007
Keywords
Activated carbon; Poly(lactic acid); Phase inversion method; Adsorption isotherm
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Funding
- Graduate School, Prince of Songkla University
- Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat Yai campus
- Faculty of Science Research Fund [158004]
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The preparation of porous materials using biodegradable materials has attracted much attention in the field of environmental pollution control. A non-toxic, user-friendly and inexpensive adsorbent bead was prepared from poly (lactic acid) (PLA) and activated carbon (AC) using a phase inversion technique. The porous structure of the PLA/AC bead was characterized by scanning electron microscopy and nitrogen adsorption-desorption methods The removal of the carcinogenic dye Rhodamine B was studied by batch equilibration method and it was found that the monolayer maximum adsorption capacity was 149.57 mg g(-1) at 60 degrees C, pH 4. A study of kinetics adsorption revealed that the Rhodamine B molecules diffused very rapidly into the interconnected pores of the PLA/AC 5% wt. beads and agreed very well with the intraparticle diffusion model. The negative value of Gibb's free energy indicated a spontaneous adsorption process, and the enthalpy change (23.92 kJ mol(-1)) implied an endothermic adsorption process. Desorption studies showed that the percentage of desorbed Rhodamine B solution increased with a decrease in pH. The results indicated that the PLA/AC bead will provide a new alternative granular adsorbent for the removal of pollutant cationic dyes from water.
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