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Optimization of Chromium (Vi) Adsorption by Novel Nano-Pumice Modified by Cationic Surfactant From Aqueous Media Using the Response Surface Method: Isotherm and Kinetic Studies Publisher



Eslami F1 ; Nodehi RN1 ; Nasseri S1 ; Salari M2 ; Mahvi AH1, 3 ; Ardejani FD4
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Environmental Health Engineering, School of Public health, Hamadan University of Medical Sciences, Hamadan, Iran
  3. 3. Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. School of Mining, College of Engineering, University of Tehran, Iran

Source: Desalination and Water Treatment Published:2020


Abstract

The present study focused on the evaluation of modified nano-pumice with hexadecyl trimethyl ammonium bromide (HDTM.Br) surfactant in adsorption of Cr(VI) from aqueous environments. The effects of pH (3–9), contact time (30–120 min), Cr(VI) concentration (0.05–1 mg/L) and adsorbent dose (0.1–1 g) on the adsorption rate were designed, modeled and optimized according to central composite design-response surface methodology (CCD-RSM). Considering ANOVA and regression analyses, the adsorption process better follows the quadratic polynomial model with p-value < 0.005, R2 = 0.9906. The model adequacy established based on CCD-RSM is quite clear with regard to the value of lack of fit test, which is 0.75. The optimum conditions were obtained at pH 3, Cr(VI) concentration 0.05 mg/L, adsorbent dose 1 g/L and contact time 120 min, respectively. The maximum adsorption capacity of Cr(VI) was found to be 0.24 mg/g. Kinetic and isotherm studies showed that the adsorption process is better described with pseudo-second kinetics with R2 = 0.9983 and Freundlich isotherm with R2 = 0.9971. Given to the highest efficiency of Cr(VI) adsorption (about 96%) by pumice/HDTM.Br nano composite, the composite can be proposed as a promising adsorbent for the removal of Cr(VI) in water under specific conditions. © 2020 Desalination Publications. All rights reserved.
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