title: Coalesced chitosan activated carbon composite for batch and fixed-bed adsorption of cationic and anionic dyes.
abstract: A renewable waste tea activated carbon (WTAC) was coalesced with chitosan to form composite adsorbent used for waste water treatment. Adsorptive capacities of crosslinked chitosan beads (CCB) and its composite (WTAC-CCB) for Methylene blue dye (MB) and Acid blue 29 (AB29) were evaluated through batch and fixed-bed studies. Langmuir, Freundlich and Temkin adsorption isotherms were tested for the adsorption process and the experimental data were best fitted by Langmuir model and least by Freundlich model; the suitability of fitness was adjudged by the Chi-square (χ(2)) and Marquadt's percent standard deviation error functions. Judging by the values of χ(2), pseudo-second-order reaction model best described the adsorption process than pseudo-first-order kinetic model for MB/AB29 on both adsorbents. After five cycles of adsorbents desorption test, more than 50% WTAC-CCB adsorption efficiency was retained while CCB had <20% adsorption efficiency. The results of this study revealed that WTAC-CCB composite is a promising adsorbent for treatment of anionic and cationic dyes in effluent wastewaters.
authors: School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia.
authors: M
authors: M
authors: Auta
authors: B H
authors: BH
authors: Hameed
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry* / Q000378:metabolism; D002244:Carbon / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry* / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000737:chemistry* / Q000378:metabolism; D008751:Methylene Blue / Q000737:chemistry* / Q000378:metabolism; D009281:Naphthalenes / Q000737:chemistry* / Q000378:metabolism; D013662:Tea; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000378:metabolism; D018508:Water Purification / Q000379:methods*
chemical_list: D001391:Azo Compounds; D004791:Enzyme Inhibitors; D009281:Naphthalenes; D013662:Tea; D014874:Water Pollutants, Chemical; C469426:acid blue 29; D002244:Carbon; D048271:Chitosan; D008751:Methylene Blue