Chemically treated cactus (Opuntia) as a sustainable biosorbent for the removal of heavy metals from aqueous solution

Characterization and adsorption capacity

Yirga Weldu Abrha, Homin Kye, Joonwun Kang

Research output: Contribution to journalArticle

Abstract

The purpose of this study was to evaluate the efficiency of chemically treated (NaOH or HCl) cactus for the removal of Zn 2+ and Mn 2+ ions from aqueous solution via biosorption. The characteristics of the adsorbents were studied using Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and Brunauer-Emmett-Teller analyses. In addition, the effects of biosorbent dose, initial metal ion concentration, contact time, initial solution pH, and temperature were investigated. Adsorption kinetics, equilibrium, and isotherm studies were also conducted. The FTIR results indicated that chemical treatment changed the stretching vibration. The elemental analysis showed that NaOH treatment increased the oxygen content by 56.91% and decreased the carbon content by 26.44%. The highest removal efficiencies of Zn 2+ and Mn 2+ were found with the NaOH-treated cactus, followed by the HCl-treated cactus. The biosorption efficiency of Zn 2+ increased from 36.0% to 95.9% and from 36.0% to 84.6% when the raw biosorbent was treated with NaOH and HCl, respectively. For Mn 2+ , the biosorption efficiency increased from 33.2% to 88.6% and from 33.2% to 71.0% when the raw biosorbent was treated with NaOH and HCl, respectively. Moreover, a rapid increase in binding efficiency was observed under conditions of pH up to 5, with Zn 2+ adsorption greater than that of Mn 2+ . Metal ion biosorption increased with increasing contact time and initial metal ion concentration. The pseudo-second-order model was more appropriate than the pseudo-first-order model for explaining the biosorption processes of Zn 2+ and Mn 2+ by cactus due to its higher R 2 value. From this study, it can be concluded that chemical pretreatment of raw cactus (Opuntia) with NaOH strongly enhanced its biosorption potential for the studied metals.

Original languageEnglish
Pages (from-to)345-354
Number of pages10
JournalDesalination and Water Treatment
Volume144
DOIs
Publication statusPublished - 2019 Mar 1

Fingerprint

Biosorption
cactus
Heavy metals
aqueous solution
heavy metal
adsorption
Adsorption
ion
metal
Metal ions
FTIR spectroscopy
X-ray spectroscopy
Fourier transform
vibration
isotherm
Contacts (fluid mechanics)
Adsorbents
Stretching
scanning electron microscopy
Fourier transform infrared spectroscopy

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Ocean Engineering
  • Pollution

Cite this

@article{67a923534c4a45b29dc55ee73a2b98be,
title = "Chemically treated cactus (Opuntia) as a sustainable biosorbent for the removal of heavy metals from aqueous solution: Characterization and adsorption capacity",
abstract = "The purpose of this study was to evaluate the efficiency of chemically treated (NaOH or HCl) cactus for the removal of Zn 2+ and Mn 2+ ions from aqueous solution via biosorption. The characteristics of the adsorbents were studied using Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and Brunauer-Emmett-Teller analyses. In addition, the effects of biosorbent dose, initial metal ion concentration, contact time, initial solution pH, and temperature were investigated. Adsorption kinetics, equilibrium, and isotherm studies were also conducted. The FTIR results indicated that chemical treatment changed the stretching vibration. The elemental analysis showed that NaOH treatment increased the oxygen content by 56.91{\%} and decreased the carbon content by 26.44{\%}. The highest removal efficiencies of Zn 2+ and Mn 2+ were found with the NaOH-treated cactus, followed by the HCl-treated cactus. The biosorption efficiency of Zn 2+ increased from 36.0{\%} to 95.9{\%} and from 36.0{\%} to 84.6{\%} when the raw biosorbent was treated with NaOH and HCl, respectively. For Mn 2+ , the biosorption efficiency increased from 33.2{\%} to 88.6{\%} and from 33.2{\%} to 71.0{\%} when the raw biosorbent was treated with NaOH and HCl, respectively. Moreover, a rapid increase in binding efficiency was observed under conditions of pH up to 5, with Zn 2+ adsorption greater than that of Mn 2+ . Metal ion biosorption increased with increasing contact time and initial metal ion concentration. The pseudo-second-order model was more appropriate than the pseudo-first-order model for explaining the biosorption processes of Zn 2+ and Mn 2+ by cactus due to its higher R 2 value. From this study, it can be concluded that chemical pretreatment of raw cactus (Opuntia) with NaOH strongly enhanced its biosorption potential for the studied metals.",
author = "Abrha, {Yirga Weldu} and Homin Kye and Joonwun Kang",
year = "2019",
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T2 - Characterization and adsorption capacity

AU - Abrha, Yirga Weldu

AU - Kye, Homin

AU - Kang, Joonwun

PY - 2019/3/1

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N2 - The purpose of this study was to evaluate the efficiency of chemically treated (NaOH or HCl) cactus for the removal of Zn 2+ and Mn 2+ ions from aqueous solution via biosorption. The characteristics of the adsorbents were studied using Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and Brunauer-Emmett-Teller analyses. In addition, the effects of biosorbent dose, initial metal ion concentration, contact time, initial solution pH, and temperature were investigated. Adsorption kinetics, equilibrium, and isotherm studies were also conducted. The FTIR results indicated that chemical treatment changed the stretching vibration. The elemental analysis showed that NaOH treatment increased the oxygen content by 56.91% and decreased the carbon content by 26.44%. The highest removal efficiencies of Zn 2+ and Mn 2+ were found with the NaOH-treated cactus, followed by the HCl-treated cactus. The biosorption efficiency of Zn 2+ increased from 36.0% to 95.9% and from 36.0% to 84.6% when the raw biosorbent was treated with NaOH and HCl, respectively. For Mn 2+ , the biosorption efficiency increased from 33.2% to 88.6% and from 33.2% to 71.0% when the raw biosorbent was treated with NaOH and HCl, respectively. Moreover, a rapid increase in binding efficiency was observed under conditions of pH up to 5, with Zn 2+ adsorption greater than that of Mn 2+ . Metal ion biosorption increased with increasing contact time and initial metal ion concentration. The pseudo-second-order model was more appropriate than the pseudo-first-order model for explaining the biosorption processes of Zn 2+ and Mn 2+ by cactus due to its higher R 2 value. From this study, it can be concluded that chemical pretreatment of raw cactus (Opuntia) with NaOH strongly enhanced its biosorption potential for the studied metals.

AB - The purpose of this study was to evaluate the efficiency of chemically treated (NaOH or HCl) cactus for the removal of Zn 2+ and Mn 2+ ions from aqueous solution via biosorption. The characteristics of the adsorbents were studied using Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and Brunauer-Emmett-Teller analyses. In addition, the effects of biosorbent dose, initial metal ion concentration, contact time, initial solution pH, and temperature were investigated. Adsorption kinetics, equilibrium, and isotherm studies were also conducted. The FTIR results indicated that chemical treatment changed the stretching vibration. The elemental analysis showed that NaOH treatment increased the oxygen content by 56.91% and decreased the carbon content by 26.44%. The highest removal efficiencies of Zn 2+ and Mn 2+ were found with the NaOH-treated cactus, followed by the HCl-treated cactus. The biosorption efficiency of Zn 2+ increased from 36.0% to 95.9% and from 36.0% to 84.6% when the raw biosorbent was treated with NaOH and HCl, respectively. For Mn 2+ , the biosorption efficiency increased from 33.2% to 88.6% and from 33.2% to 71.0% when the raw biosorbent was treated with NaOH and HCl, respectively. Moreover, a rapid increase in binding efficiency was observed under conditions of pH up to 5, with Zn 2+ adsorption greater than that of Mn 2+ . Metal ion biosorption increased with increasing contact time and initial metal ion concentration. The pseudo-second-order model was more appropriate than the pseudo-first-order model for explaining the biosorption processes of Zn 2+ and Mn 2+ by cactus due to its higher R 2 value. From this study, it can be concluded that chemical pretreatment of raw cactus (Opuntia) with NaOH strongly enhanced its biosorption potential for the studied metals.

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