Chitosan based nano composite adsorbent—Synthesis, characterization and application for adsorption of binary mixtures of Pb(II) and Cd(II) from water

Maity, Jayabrata; Ray, S. K.

doi:10.1016/j.carbpol.2017.10.086

Cited by 109 publications

(33 citation statements)

References 67 publications

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“…According to these parameter values, cobalt ion will have a greater accessibility to the adsorbent surface at 50 ml cobalt solution, which would lead to a higher extent in the adsorption process. Similar type of findings has also been reported by other researchers [11,12].…”

Section: Effect Of Dosesupporting

confidence: 92%

Kinetic and Thermodynamic Sorption Study of Cobalt Removal From Water Solution With Magnetic Nano-Hydroxyapatite

Swelam

Salem

Aanym

et al. 2018

Al-Azhar Bulletin of Science

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In this study, Magnetite-hydroxyapatite nanocomposites were prepared by in situ precipitation of the calcium phosphate phase in an iron oxide colloidal suspension. Adsorption of cobalt was initially rapid and the adsorption process reached a steady state after 180 min. The Co(II) adsorption capability of the MHAp was investigated as a function of temperature, pH, ionic strength, adsorbent dosage, agitation speed and initial Co(II) concentration. Theincrease in pH and temperature resulted in an increase in Co(II) adsorption capacity; Increasing ionic strength increased the adsorption of Co(II) by MHAp; The adsorption isotherms were well described by the Freundlich model, Langmuir, Temkin and D-R models. The Freundlich model was found to provide the better fit with the experimental data. Different types of adsorption kinetic models were used to describe the Co (II) adsorption behaviour, and the experimental results fitted the pseudo-second-order kinetic models well. Thermodynamics parameters such as ∆H o , ∆S o , ∆G o revealed that the adsorption of Co(II) by MHAp was endothermic in nature, physisorption, spontaneous at 308 and 318K.

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Section: Effect Of Dosesupporting

confidence: 92%

Kinetic and Thermodynamic Sorption Study of Cobalt Removal From Water Solution With Magnetic Nano-Hydroxyapatite

Swelam

Salem

Aanym

et al. 2018

Al-Azhar Bulletin of Science

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“…The second weight loss stage took place at approximately 340 °C because a small amount of organic matter decomposed. The final weight loss of approximately 4% began at 500 °C due to the grafted chemical bonds being broken down and the thermal degradation of polymers 32 . From these data, it is apparent that SB contributed approximately 12% to the total mass of TLSB, and TLSB showed a lower rate of weight loss within the temperature range of 20-700 °C, implying greater thermal robustness.…”

Section: Resultsmentioning

confidence: 99%

Enhanced heavy metal removal from an aqueous environment using an eco-friendly and sustainable adsorbent

Zhang

et al. 2020

Sci Rep

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Thiol-lignocellulose sodium bentonite (TLSB) nanocomposites can effectively remove heavy metals from aqueous solutions. TLSB was formed by using –SH group-modified lignocellulose as a raw material, which was intercalated into the interlayers of hierarchical sodium bentonite. Characterization of TLSB was then performed with BET, FTIR, XRD, TGA, PZC, SEM, and TEM analyses. The results indicated that thiol-lignocellulose molecules may have different influences on the physicochemical properties of sodium bentonite, and an intercalated–exfoliated structure was successfully formed. The TLSB nanocomposite was subsequently investigated to validate its adsorption and desorption capacities for the zinc subgroup ions Zn(II), Cd(II) and Hg(II). The optimum adsorption parameters were determined based on the TLSB nanocomposite dosage, concentration of zinc subgroup ions, solution pH, adsorption temperature and adsorption time. The results revealed that the maximum adsorption capacity onto TLSB was 357.29 mg/g for Zn(II), 458.32 mg/g for Cd(II) and 208.12 mg/g for Hg(II). The adsorption kinetics were explained by the pseudo-second-order model, and the adsorption isotherm conformed to the Langmuir model, implying that the dominant chemical adsorption mechanism on TLSB is monolayer coverage. Thermodynamic studies suggested that the adsorption is spontaneous and endothermic. Desorption and regeneration experiments revealed that TLSB could be desorbed with HCl to recover Zn(II) and Cd(II) and with HNO3 to recover Hg(II) after several consecutive adsorption/desorption cycles. The adsorption mechanism was investigated through FTIR, EDX and SEM, which demonstrated that the introduction of thiol groups improved the adsorption capacity. All of these results suggested that TLSB is an eco-friendly and sustainable adsorbent for the extraction of Zn(II), Cd(II) and Hg(II) ions in aqueous media.

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“…The extensive release of heavy metals and organic dyes over the past decades have led to widespread water pollution [3,4,5]. Specifically, cadmium (Cd(II)) is a common high-toxic metal contaminant originating from numerous industries, such as printing, textile, and metal plating [6,7]. To date, many technologies have been developed to remove the metal ions and organic compounds from wastewater, including physical adsorption, membrane filtration, ion exchange, chemical precipitation, photocatalytic biodegradation, and electrochemical treatment [4,8].…”

Section: Introductionmentioning

confidence: 99%

A Simple Low-Cost Method to Prepare Lignocellulose-Based Composites for Efficient Removal of Cd(II) from Wastewater

Wen

Zhang

et al. 2019

Polymers

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The fabrication of functional lignocellulose-based materials has drawn considerable attention because it acts as a green separation/absorption material owing to its multi-porous mesostructure. In this study, a surface functionalized lignocellulose-based adsorbent for the highly efficient capture of Cd(II) ions was prepared through facile in situ co-deposition of wood waste-derived saw powder (SP) in the presence of tannic acid (TA) and aminopropyltriethoxysilane (APTES) mixed aqueous solution. The SP was first modified using TA-APTES coating to synthesize the functional SP substrate (SP-(TA-APTES)). The SP-(TA-APTES) hybrids served as reactive platforms, which enabled further decoration with amino-rich polyethylenimine (PEI) due to the outstanding secondary reactions of the TA-APTES layer. The surface morphology of the resulting SP-(TA-APTES)-PEI (SP-TAPI) composites were investigated using Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). Significantly, the combined advantages of the lignocellulosic skeleton, the layer-particle structure, and the hybrid coating contributed to the enhanced adsorption capacity of Cd(II) (up to 22.66 mg/g at pH = 5.0). This removal capacity was higher than that of most reported agricultural waste-based or lignocellulose-based materials. The Cd(II) adsorption mechanism of the surface-modified SP-TAPI composites was studied in detail. These results provide new insights into the high value-added utilization of agricultural waste for water purification applications.

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Chitosan based nano composite adsorbent—Synthesis, characterization and application for adsorption of binary mixtures of Pb(II) and Cd(II) from water

Cited by 109 publications

References 67 publications

Kinetic and Thermodynamic Sorption Study of Cobalt Removal From Water Solution With Magnetic Nano-Hydroxyapatite

Kinetic and Thermodynamic Sorption Study of Cobalt Removal From Water Solution With Magnetic Nano-Hydroxyapatite

Enhanced heavy metal removal from an aqueous environment using an eco-friendly and sustainable adsorbent

A Simple Low-Cost Method to Prepare Lignocellulose-Based Composites for Efficient Removal of Cd(II) from Wastewater

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