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• W3134038306 endingPage "1207" @default.
• W3134038306 startingPage "1193" @default.
• W3134038306 abstract "Several conventional techniques for heavy metals decontamination for instance ion exchange, evaporation, precipitation and electroplating have been utilized in preceding years. Though these techniques have some drawbacks, adsorption using low-cost biosorbents is environmentally friendly. In this study, the potential of several natural and agricultural wastes as economical biosorbents for the reduction of Cr(VI) ions from polluted water has been reviewed. The application of adsorption models, as well as the impact of adsorption factors on heavy metals eradication, has been considered in this review. The study revealed that efficient reduction of Cr(VI) from water and wastewaters is highly dependent on the pH of the solution, shaking time, adsorbent type, initial concentration and temperature. The review of the relevant literature indicates that the maximum removal efficiency of Cr(VI) using the various low-cost adsorbents ranged from 50.0-100.0% with optimum pH and contact time ranging from 2.0-6.0 and 30.0-180.0 min, respectively at room temperature (25.0 °C). Furthermore, considering all the studies reviewed, the pseudo-second-kinetics and Langmuir isotherm are the dominant models that best described the Cr(VI) equilibrium data. The thermodynamic parameters suggested that the biosorption of Cr(VI) on the biosorbents was spontaneous, realistic and endothermic at the temperature range of 30.0-45.0 °C. It is found that the natural and agricultural wastes as cheap biosorbents are feasible replacements to commercial activated carbons for metal-contaminated water treatment. However, gaps have been identified to improve applicability, regeneration, reuse and safe discarding of the laden adsorbents, optimization and commercialization of suitable agricultural adsorbents." @default.
• W3134038306 created "2021-03-15" @default.
• W3134038306 creator A5011582238 @default.
• W3134038306 date "2021-03-10" @default.
• W3134038306 modified "2023-10-14" @default.
• W3134038306 title "An extensive review on chromium (vi) removal using natural and agricultural wastes materials as alternative biosorbents" @default.
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• W3134038306 doi "https://doi.org/10.1007/s40201-021-00641-w" @default.
• W3134038306 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8172654" @default.
• W3134038306 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34150305" @default.
• W3134038306 hasPublicationYear "2021" @default.
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