期刊
ENVIRONMENTAL TECHNOLOGY
卷 39, 期 22, 页码 2856-2872出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2017.1367845
关键词
Dye pollutant removal; adsorption; bio-sorbent; carboxymethylcellulose; hydrogels; environmentally friendly membranes
资金
- Brazilian research agency: Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior, CAPES [PROEX-433/2010, PROINFRA2010-2014]
- Brazilian research agency: Fundacao de Amparo a Pesquisa do Estado de Minas Gerais, FAPEMIG [PPM-00760-16, BCN-TEC 30030/12]
- Brazilian research agency: Conselho Nacional de Desenvolvimento Cientifico e Tecnologico, CNPq [PQ1B-306306/2014-0, UNIVERSAL-457537/2014-0, PIBIC-2014/2015]
- Brazilian research agency: Financiadora de Estudos e Projetos, FINEP [CTINFRA-PROINFRA 2008/2010/2011]
In this study, new eco-friendly hydrogel adsorbents were synthesized based on carboxymethylcellulose (CMC, degree of substitution [DS] = 0.7) chemically cross-linked with citric acid (CA) using a green process in aqueous solution and applied for the adsorption of methylene blue (MB). Spectroscopic analyses demonstrated the mechanism of cross-linking through the reaction of hydroxyl functional groups from CMC with CA. These CMC hydrogels showed very distinct morphological features dependent on the extension of cross-linking and their nanomechanical properties were drastically increased by approximately 300% after cross-linking with 20% CA (e.g. elastic moduli from 80 +/- 15 to 270 +/- 50 MPa). Moreover, they were biocompatible using an in vitro cell viability assay in contact with human osteosarcoma-derived cells (SAOS) for 24 h. These CMC-based hydrogels exhibited adsorption efficiency above 90% (24 h) and maximum removal capacity of MB from 5 to 25 mg g(-1) depending on the dye concentration (from 100 to 500 mg L-1), which was used as the model cationic organic pollutant. The adsorption of process of MB was well-fit to the pseudo-second-order kinetics model. The desorption of MB by immersion in KCl solution (3 mol L-1, 24 h) showed a typical recovery efficiency of over 60% with conceivable reuse of these CMC-based hydrogels. Conversely, CMC hydrogels repelled methyl orange dye used as model anionic pollutant, proving the mechanism of adsorption by the formation of charged polyelectrolyte/dye complexes. [GRAPHICS]
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