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- W2312425272 abstract "Abstract Adsorbents like water hyacinth leaf, powdered activated carbon (PAC), PAC in combination with polymer beads (added to enhance the porosity) and a combination of PAC with water hyacinth leaves were used to remove hexavalent chromium from wastewater. Equilibrium was achieved after approximately 18 h. The maximum equilibrium sorption capacity (q max), determined from Langmuir isotherm, are: ADRB1: 9.638 mg/g; ADRB2: 31.46 mg/g; ADRB3: 55.926 mg/g; ADRB4: 33.575 mg/g for 1l wastewater solutions. The adsorption capacity of PAC (ADRB3) has been found more than the composite ADRB4 with a combination of WH (2 g) and PAC (1 g). However, ADRB4 could be used for applications where large quantity of wastewater (e.g. leather complexes) containing hexavalent chromium is disposed into a huge water body where plenty of water hyacinths are grown naturally. Simultaneously three isotherms namely Tempkin, Freundlich and Langmuir were parameterized. The parameters were estimated using the Levenburg and Marquardt optimization scheme, which is based on the minimization of the Sum of the Squares of the Residuals or Deviations (SSQ). The uncertainties associated with the estimated parameters and the range of confidence limits were computed. Close agreement was observed between the predicted Langmuir output and the experimental data for the system considered. This particular case satisfi ed experimental conditions with almost negligible interaction, constant energy of adsorption and equally likely competition between species. Hence Langmuir ranked first for three times out of four experiments." @default.
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- W2312425272 date "2012-10-01" @default.
- W2312425272 modified "2023-10-18" @default.
- W2312425272 title "Batch equilibrium analysis for the removal of hexavalent chromium: analysis of uncertainties using numerical modelling" @default.
- W2312425272 doi "https://doi.org/10.1080/19443994.2012.698797" @default.
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