期刊
SN APPLIED SCIENCES
卷 3, 期 2, 页码 -出版社
SPRINGER INT PUBL AG
DOI: 10.1007/s42452-021-04245-9
关键词
Pectin; Alginate; Titanium oxide; Composite; Methylene blue; Adsorption
资金
- Faculty of Science, University Brunei Darussalam
- Ministry of Research, Technology and Higher Education of the Republic of Indonesia [NKB-1093/UN2.R3.1/898 HKP.05.00/2019]
PAT composites showed higher efficiency in adsorptive removal of MB compared to other adsorbents, with adsorption kinetics following a pseudo-second order process and the Langmuir isotherm model indicating a maximum adsorption capacity in the range of 435-637 mg g(-1).
In the present study, pectin-alginate-titania (PAT) composites were synthesized and the adsorptive removal behavior of methylene blue (MB) from aqueous solution, as a model of synthetic organic effluents, onto the prepared PAT composites were investigated by monitoring the effect of contact time, initial MB concentration, and temperature. The adsorption isotherm data were fitted well with the Freundlich isotherm model, suggesting the surface heterogeneity of the PAT composites and that the MB adsorption occurred on the active sites on multilayer surface of the composites. The adsorption kinetics of MB was demonstrated to be pseudo-second order, governed by two intraparticle diffusion rates, and the adsorption process was exothermic, spontaneous, and more disorder. The Langmuir isotherm model suggested that the maximum adsorption capacity of MB on the PAT composites was in the range of 435-637 mg g(-1). In general, it increased with the TiO2 NPs content in the PAT composites, due most likely to the increase in surface area exposing more functional groups of the pectin and alginate to interact with the synthetic dye. The adsorptive removal of MB by the PAT composites was found to be more efficient compared with many other reported adsorbents, such as graphene oxide hybrids, pectin microspheres, magnetite-silica-pectin composites, clay-based materials, chemically treated minerals, and agricultural waste. The present study therefore demonstrated for the first time that PAT composites are not only promising to be utilized as an adsorbent in wastewater treatment, but also provide an insight into the adsorption mechanism of the synthetic dyes onto the biopolymers-titania composites. [GRAPHICS] .
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