Adsorption of heavy metal ions by mesoporous ZnO and TiO2@ZnO monoliths: Adsorption and kinetic studies

Sharma, Mohan Lal; Singh, Jasminder; Hazra, S.; Basu, Soumen

doi:10.1016/j.microc.2018.10.026

Cited by 131 publications

(48 citation statements)

References 30 publications

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“…Therefore, the change in Gibbs free energy (∆G°), enthalpy (∆H°), and entropy (∆S°) values of Pb(II), Cu(II), and Cr(VI) adsorption is given in Table 6. Accordingly, all of the calculated adsorption enthalpies for of Pb(II), Cu(II), and Cr(VI) adsorption are positive, indicating endothermic processes which were also predicted before (Sharma et al 2019). The endothermic nature of adsorption can be attributed to increase in the mobility of the heavy metal ions and increase in the rate of diffusion of the adsorbate molecules across the external boundary layer and in the internal pores of the adsorbent particle, because of the decrease in the viscosity of the solution.…”

Section: Adsorption Thermodynamicssupporting

confidence: 63%

Chemically activated carbon production from agricultural waste of chickpea and its application for heavy metal adsorption: equilibrium, kinetic, and thermodynamic studies

et al. 2019

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The purpose of this study was to produce activated carbons (ACs) from chickpea (Cicer arietinum) husks by chemical activation (KOH and K 2 CO 3) and to examine their feasibility in removing heavy metals from aqueous solutions. In the case of KOH impregnation with a ratio of 50 wt%, the most developed porosity was achieved, with a BET surface area of 2082 m 2 /g and a total pore volume of 1.07 cm 3 /g. By using the product, the maximum adsorption capacities were found to be 135.8, 59.6, and 56.2 mg/g for Pb(II), Cr(VI), and Cu(II), respectively. The experimental data were analyzed by various adsorption isotherm and kinetic models. Thermodynamic parameters such as ΔG°, ΔH°, and ΔS° were also calculated. The results obtained in this study shows that adsorption onto chickpea-husk-derived activated carbon was endothermic and spontaneous for the removal of heavy metals from aqueous solutions.

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Section: Adsorption Thermodynamicssupporting

confidence: 63%

Chemically activated carbon production from agricultural waste of chickpea and its application for heavy metal adsorption: equilibrium, kinetic, and thermodynamic studies

et al. 2019

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“…The crystallite size of TiO 2 nanoparticles calculated from Scherrer formula ( D = 0.9λ/β cos θ, where λ is the wavelength of CuKα, β is the full width at half maxima of the diffraction peaks, and θ is the Bragg's angle) was found to be 22 nm which was in good agreement with the FESEM result. For ZnO nanoparticles, the dominant peaks at 2θ = 31.9° (1 0 0), 34.5° (0 0 2), 36.3° (1 0 1), 47.5° (1 0 2), 56.6° (1 1 0), and 62.7° (1 0 3) revealed the hexagonal structure of ZnO nanoparticles (JCPDS, No.36‐1451) (Sharma et al, ). The XRD pattern of SSC indicated the structure of activated carbon with some graphite.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the potential of TiO 2 -based hybrid adsorbent/catalyst has been studied for the water treatment (Hernández et al, 2014;Kanakaraju, Ravichandar, & Lim, 2017). Therefore, the coupling of ZnO and TiO 2 nanoparticles has been considered as an effective method for increasing the individual properties of ZnO and TiO 2 nanoparticles for metal ion sorption (Sharma, Singh, Hazra, & Basu, 2019). However, the use of nanoparticles due to their difficult recovery is limited (Xu et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of sewage sludge‐based carbon/TiO₂/ZnO nanocomposite adsorbent for the removal of Ni(II), Cu(II), and chemical oxygen demands from aqueous solutions and industrial wastewater

Khosravi

Mehrdadi

Bidhendi

et al. 2019

Water Environment Research

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The removal of heavy metal ions and organic materials from wastewater due to their toxicity is necessary. In the present study, the titanium dioxide/zinc oxide (TiO2/ZnO) nanocomposite has been coated on the sewage sludge carbon (SSC) surface and its application was investigated for the adsorption of Ni(II), Cu(II), and chemical oxygen demands (COD) reduction from aqueous solutions and industrial wastewaters in Eshtehard, Iran. The effect of adsorption parameters in a single system such as TiO2/ZnO ratio, TiO2/ZnO concentration, pH, adsorbent dosage, contact time, ionic strength, temperature, and initial concentrations of Ni(II), Cu(II), and COD was investigated on the adsorption capacity of synthesized SSC/TiO2/ZnO adsorbent. The pseudo‐second order and Redlich–Peterson isotherm models were best described the kinetic and equilibrium data of Ni(II), Cu(II), and COD sorption. The maximum monolayer sorption capacities of Ni(II), Cu(II), and COD were found to be 62.3, 75.1, and 1,120.3 mg/g, respectively. The central composite design was used to investigate the interaction effects of pH and initial concentrations of Ni(II), Cu(II), and COD on the simultaneous removal of Ni(II), Cu(II), and COD from aqueous solutions in a ternary system. The potential of synthesized SSC/TiO2/ZnO adsorbent was investigated for Ni(II), Cu(II), and COD adsorption from industrial wastewaters of Iran. Practitioner points The novel sewage sludge carbon/TiO2/ZnO adsorbent was synthesized. Adsorption of Ni(II), Cu(II), and chemical oxygen demands (COD) from industrial wastewaters was investigated. Maximum Ni(II), Cu(II), and COD sorption capacities were 62.3, 75.1, and 1,120.3 mg/g. Simultaneous removal of Ni(II), Cu(II), and COD was investigated in a ternary system.

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“…Moreover, Awual et al synthesized ligand-impregnated conjugate nanomaterials for the extraction of mercury from aqueous solution [116]. Metal oxides such as Al 2 O 3 [117], TiO 2 [118], and SiO 2 [119] have been used for metal extraction due to their physical stability, cost-effectiveness, and high surface area [118]. Other examples are shown in Table 4.…”

Section: Nanosorbent Materialsmentioning

confidence: 99%

Evolution of Environmentally Friendly Strategies for Metal Extraction

et al. 2020

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The demand for the recovery of valuable metals and the need to understand the impact of heavy metals in the environment on human and aquatic life has led to the development of new methods for the extraction, recovery, and analysis of metal ions. With special emphasis on environmentally friendly approaches, efforts have been made to consider strategies that minimize the use of organic solvents, apply micromethodology, limit waste, reduce costs, are safe, and utilize benign or reusable materials. This review discusses recent developments in liquid- and solid-phase extraction techniques. Liquid-based methods include advances in the application of aqueous two- and three-phase systems, liquid membranes, and cloud point extraction. Recent progress in exploiting new sorbent materials for solid-phase extraction (SPE), solid-phase microextraction (SPME), and bulk extractions will also be discussed.

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Adsorption of heavy metal ions by mesoporous ZnO and TiO2@ZnO monoliths: Adsorption and kinetic studies

Cited by 131 publications

References 30 publications

Chemically activated carbon production from agricultural waste of chickpea and its application for heavy metal adsorption: equilibrium, kinetic, and thermodynamic studies

Chemically activated carbon production from agricultural waste of chickpea and its application for heavy metal adsorption: equilibrium, kinetic, and thermodynamic studies

Synthesis of sewage sludge‐based carbon/TiO₂/ZnO nanocomposite adsorbent for the removal of Ni(II), Cu(II), and chemical oxygen demands from aqueous solutions and industrial wastewater

Evolution of Environmentally Friendly Strategies for Metal Extraction

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Adsorption of heavy metal ions by mesoporous ZnO and TiO2@ZnO monoliths: Adsorption and kinetic studies

Cited by 131 publications

References 30 publications

Chemically activated carbon production from agricultural waste of chickpea and its application for heavy metal adsorption: equilibrium, kinetic, and thermodynamic studies

Chemically activated carbon production from agricultural waste of chickpea and its application for heavy metal adsorption: equilibrium, kinetic, and thermodynamic studies

Synthesis of sewage sludge‐based carbon/TiO2/ZnO nanocomposite adsorbent for the removal of Ni(II), Cu(II), and chemical oxygen demands from aqueous solutions and industrial wastewater

Evolution of Environmentally Friendly Strategies for Metal Extraction

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Synthesis of sewage sludge‐based carbon/TiO₂/ZnO nanocomposite adsorbent for the removal of Ni(II), Cu(II), and chemical oxygen demands from aqueous solutions and industrial wastewater