Investigation of the efficiency of bentonite nanoclay as an adsorbent for removal of Cr and Co from aqueous solutions: Adsorption isotherm and kinetics studies

Introduction and Aims Nowadays, the presence of toxic heavy metals in the industrial, commercial, domestic and agricultural effluents is known as a major environmental concern. Since the adsorption process is one of the most effective methods for removing of metal ions from the environment, the curr...

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Main Authors: Hajar Merrikhpour, Soheil Sobhan Ardakani
Format: Article
Language:fas
Published: Neyshabur University of Medical Sciences 2017-11-01
Series:Majallah-i Dānishkadah-i ̒ulūm-i Pizishkī-i Niyshābūr
Subjects:
Online Access:http://journal.nums.ac.ir/browse.php?a_code=A-10-434-1&slc_lang=en&sid=1
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spelling doaj-ce3e680a691b43c99f9623ec10be663a2020-11-24T21:40:39ZfasNeyshabur University of Medical SciencesMajallah-i Dānishkadah-i ̒ulūm-i Pizishkī-i Niyshābūr2383-32032476-27682017-11-0153924Investigation of the efficiency of bentonite nanoclay as an adsorbent for removal of Cr and Co from aqueous solutions: Adsorption isotherm and kinetics studiesHajar Merrikhpour0Soheil Sobhan Ardakani1 Sayyed Jamaleddin Asadabadi University Hamedan Branch, Islamic Azad University Introduction and Aims Nowadays, the presence of toxic heavy metals in the industrial, commercial, domestic and agricultural effluents is known as a major environmental concern. Since the adsorption process is one of the most effective methods for removing of metal ions from the environment, the current study was carried out to investigate the efficiency of bentonite nanoclay as an adsorbent for removal of Cr and Co from aqueous solutions. Materials and Methods All stages of the experiment were performed under optimum conditions, using nanosized bentonite absorbent discontinuously. In this study, batch experiments were carried out as a function of solution pH, adsorbent dosage, initial concentration, and contact time. The equilibrium isotherms were characterized and kinetic models were tested. Also, to determine the adsorption rate constant of metals onto the adsorbent, experimental data were compared by pseudo-first-order and pseudo-second-order kinetic models and then were adjusted to Langmuir and Freundlich models. All statistical analyses were performed using the SPSS statistical package. Results The results showed that by raising pH, the adsorption efficiency of Co and Cr from solution were increased and decreased respectively. The maximum adsorption capacity of Cr and Co was observed at pH 3 and 5 respectively after 30 minutes. Also, by increasing the adsorbent amount to 0.5 g and 2 g, adsorption efficiency increased and then there is no significant changes in removal efficiency were observed by increasing the adsorbent dosage. Moreover, under these conditions, the kinetics of the adsorption process followed pseudo-second-order and both Langmuir and Freundlich adsorption isotherms with a correlation coefficient greater than 0.90. Conclusion Based on the results, it can be concluded that the bentonite nanoclay can be used for removal of metals ions from real samples.http://journal.nums.ac.ir/browse.php?a_code=A-10-434-1&slc_lang=en&sid=1Adsorption IsothermAqueous SolutionBentonite NanoclayChromiumCobalt
collection DOAJ
language fas
format Article
sources DOAJ
author Hajar Merrikhpour
Soheil Sobhan Ardakani
spellingShingle Hajar Merrikhpour
Soheil Sobhan Ardakani
Investigation of the efficiency of bentonite nanoclay as an adsorbent for removal of Cr and Co from aqueous solutions: Adsorption isotherm and kinetics studies
Majallah-i Dānishkadah-i ̒ulūm-i Pizishkī-i Niyshābūr
Adsorption Isotherm
Aqueous Solution
Bentonite Nanoclay
Chromium
Cobalt
author_facet Hajar Merrikhpour
Soheil Sobhan Ardakani
author_sort Hajar Merrikhpour
title Investigation of the efficiency of bentonite nanoclay as an adsorbent for removal of Cr and Co from aqueous solutions: Adsorption isotherm and kinetics studies
title_short Investigation of the efficiency of bentonite nanoclay as an adsorbent for removal of Cr and Co from aqueous solutions: Adsorption isotherm and kinetics studies
title_full Investigation of the efficiency of bentonite nanoclay as an adsorbent for removal of Cr and Co from aqueous solutions: Adsorption isotherm and kinetics studies
title_fullStr Investigation of the efficiency of bentonite nanoclay as an adsorbent for removal of Cr and Co from aqueous solutions: Adsorption isotherm and kinetics studies
title_full_unstemmed Investigation of the efficiency of bentonite nanoclay as an adsorbent for removal of Cr and Co from aqueous solutions: Adsorption isotherm and kinetics studies
title_sort investigation of the efficiency of bentonite nanoclay as an adsorbent for removal of cr and co from aqueous solutions: adsorption isotherm and kinetics studies
publisher Neyshabur University of Medical Sciences
series Majallah-i Dānishkadah-i ̒ulūm-i Pizishkī-i Niyshābūr
issn 2383-3203
2476-2768
publishDate 2017-11-01
description Introduction and Aims Nowadays, the presence of toxic heavy metals in the industrial, commercial, domestic and agricultural effluents is known as a major environmental concern. Since the adsorption process is one of the most effective methods for removing of metal ions from the environment, the current study was carried out to investigate the efficiency of bentonite nanoclay as an adsorbent for removal of Cr and Co from aqueous solutions. Materials and Methods All stages of the experiment were performed under optimum conditions, using nanosized bentonite absorbent discontinuously. In this study, batch experiments were carried out as a function of solution pH, adsorbent dosage, initial concentration, and contact time. The equilibrium isotherms were characterized and kinetic models were tested. Also, to determine the adsorption rate constant of metals onto the adsorbent, experimental data were compared by pseudo-first-order and pseudo-second-order kinetic models and then were adjusted to Langmuir and Freundlich models. All statistical analyses were performed using the SPSS statistical package. Results The results showed that by raising pH, the adsorption efficiency of Co and Cr from solution were increased and decreased respectively. The maximum adsorption capacity of Cr and Co was observed at pH 3 and 5 respectively after 30 minutes. Also, by increasing the adsorbent amount to 0.5 g and 2 g, adsorption efficiency increased and then there is no significant changes in removal efficiency were observed by increasing the adsorbent dosage. Moreover, under these conditions, the kinetics of the adsorption process followed pseudo-second-order and both Langmuir and Freundlich adsorption isotherms with a correlation coefficient greater than 0.90. Conclusion Based on the results, it can be concluded that the bentonite nanoclay can be used for removal of metals ions from real samples.
topic Adsorption Isotherm
Aqueous Solution
Bentonite Nanoclay
Chromium
Cobalt
url http://journal.nums.ac.ir/browse.php?a_code=A-10-434-1&slc_lang=en&sid=1
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