Adsorption of Lead(II) from Aqueous Solution Using Chitosan and Polyvinyl Alcohol Blends

Predescu, Andra Mihaela; Matei, Ecaterina; Râpă, Maria; Pantilimon, Cristian; Coman, George; Savin, Simona; Popa, Elena Elisabeta; Predescu, Cristian

doi:10.1080/00032719.2019.1588286

Cited by 16 publications

(7 citation statements)

References 38 publications

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“…Consequently, this can reduce the adsorption performance in acidic pH values. Furthermore, increasing the pH values reduced the adsorption capacity, which could be due to the development of Pb(OH) 2 and Pb(OH) + [25,26]. Similar investigations were reported in previous studies in, which neutral pH value was also confirmed as optimal pH for the adsorption of Pb(II) by using PVA-based composites [20,32,33].…”

Section: Effect Of Solution Phsupporting

confidence: 85%

“…Based upon this result, the adsorption behavior of Pb(II) was mainly via chemical adsorption. A similar adsorption mechanism was reported in previous studies for the adsorption of heavy metals by using various PVA-based hydrogels as adsorbents [25,27,32]. Moreover, it can be analyzed that the kinetics rate constants (K 1 ) and (K 2 ) were gradually decreased with increasing Pb(II) concentrations, which may be due to the much higher competition for the sorption surface active sites at higher Pb(II) concentration.…”

Section: Adsorption Kinetic Studiessupporting

confidence: 80%

“…Chitosan/PVA beads Chitosan/PVA mixed ratio = 75:25-25:75, glutaraldehyde = 5% (v/v), acetic acid = 1% (wt %), deionized water = 552 g 9.48 mg/g [25] Chitosan/PVA blend nanofiber membrane Chitosan, distilled water, PVA, acetic acid = 2% (wt %) 266.12 mg/g [26] Cellulose/chitosan/PVA nanofibrous films…”

Section: Hydrogel Compositementioning

confidence: 99%

“…In recent years, chitosan has been incorporated with PVA and showed excellent adsorption, thermal and mechanical characteristics. Chitosan/PVA beads hydrogel composites have stated an adsorption capacity of 9.48 mg/g for Pb(II) [25]. This lower adsorption activity was due to the shorter contact time and lower Pb(II) concentration.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

et al. 2020

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Polyvinyl alcohol (PVA) hydrogel are still restricted for some applications because their lower mechanical strength and thermal stability. The PVA-based composites are drawing attention for the removal of heavy metals based on their specific functionality in adsorption process. The main objective of this work is to synthesize oil palm bio-waste (OPB)/multiwalled carbon nanotubes (MWCNTs) reinforced PVA hydrogels in the presence of N,N′-methylenebisacrylamide (NMBA) as a crosslinking agent and ammonium persulfate (APS) as an initiator via simple in-situ polymerization technique. The as-prepared reinforced nanocomposites were characterized by FESEM, BET surface area, differential scanning calorimetry (DSC), TGA and FTIR analysis. The possible influence of OPB and MWCNTs on the tensile strength, elongation at break and elastic modulus of the samples were investigated. It was found that reinforced nanocomposites exhibited enhanced mechanical properties as compared to non-reinforced material. The evaluation of reinforced nanocomposites was tested by the removal of Pb(II) aqueous solutions in a batch adsorption system. The pseudo-second-order kinetic model was used to illustrate the adsorption kinetic results and Langmuir isotherm was more suitable to fit the equilibrium results providing maximum adsorption capacities. The evaluation of thermodynamic parameters describes the spontaneous, endothermic and chemisorption adsorption process while activation energy reveals the physical adsorption mechanism. Therefore, the coordination effects among OPB, MWCNTs and PVA polymer hydrogels can produce a promising adsorbent material for wastewater treatment applications.

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Section: Effect Of Solution Phsupporting

confidence: 85%

Section: Adsorption Kinetic Studiessupporting

confidence: 80%

Section: Hydrogel Compositementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

et al. 2020

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“…Massive amounts of industrial and agricultural water around the world are polluted by various types of contaminants that harm the environment and affect human health. Removing contaminants from effluents with sustainable adsorbent materials made from abundant and inexpensive cellulose, alginate, starch, chitosan is a feasible approach to deal with this problem [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. These polysaccharides are advantageous for the adsorption of heavy metals from aqueous solutions due to their low cost, biodegradability, and reduced carbon footprint and environmental impact.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials

et al. 2021

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Massive amounts of industrial and agricultural water around the world are polluted by various types of contaminants that harm the environment and affect human health. Alginic acid is a very versatile green polymer used for heavy metal adsorption due to its availability, biocompatibility, low cost, and non-toxic characteristics. The aim of this paper was to prepare new low-cost hybrid composite beads using sodium alginate with treated montmorillonite and kaolin for the adsorption of copper (Cu) cations. Modified and unmodified clays were investigated by studying their morphology and elemental composition, functional groups, and mean particle size and particle size distribution. The characterization of alginate/clay hybrid composite beads was carried out by evaluating surface morphology (by scanning electron microscopy, SEM), crystallinity (by X-ray diffraction, XRD), and point of zero charge (pHpzc)(Zeta Potential Analyzer). Batch adsorption experiments of alginate/clay hybrid composite beads investigated the effect of metal concentration in the range of 1–4 mg L−1 on Cu(II) removal, adsorption kinetic for maximum 240 min, and Langmuir and Freundlich adsorption isotherms by using atomic absorption spectrometry. The pseudo-second-order kinetic model best fitted the adsorption for alginate/montmorillonite beads (R2 = 0.994), while the diffusion process was predominant for montmorillonite/kaolin beads (R2 = 0.985). The alginate/clay hybrid materials best fitted the Langmuir isotherm model.

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Alkali modified Abies bornmulleriana cones as a costeffective biosorbent for enhanced removal of Pb (II) ions, and its comparison with normal biosorbent: Isotherm, kinetic, and thermodynamic parameters

Oğuz

2021

Env Prog and Sustain Energy

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The purpose of this investigation is the increase the biosorption efficiency and capacity in the removal of Pb (II) ions using Abies bornmulleriana cones modified with NaOH.The biosorption capacity of Pb (II) ions decreased in the presence of Cu (II), Cd (II), Ni (II), and Co (II) ions. Brunauer, Emmett, and Teller surface area and pore volume of the NB and MB after the biosorption decreased by (4.37 m 2 g À1 and 0.00154 cm 3 g À1 ) and (0.41 m 2 g À1 and 0.00014 cm 3 g À1 ), respectively. The pseudo-second-order kinetic gave the best fit to the biosorption data (R 2 0.97, 0.97). The biosorption data for the NB and MB fitted well to Dubinin-Radushkevitch (D-R) isotherm due to the high R 2 values (0.97, 0.97), and the maximum biosorption capacities were determined as 24.42 and 43.67 mg g À1 , respectively. The change of free energy, enthalpy, and entropy of the biosorption for the NB and MB were determined as [(À2.10 kJ mol À1 , 14.72 kJ mol À1 , and 0.057 kJ mol À1 K À1 ) and (À7.04 kJ mol À1 , 121 kJ mol À1 , and 0.438 kJ mol À1 K À1 )], respectively. The NB and MB regeneration with 0.1 N HNO 3 showed that the biosorption and desorption processes were reversible.

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Adsorption of Lead(II) from Aqueous Solution Using Chitosan and Polyvinyl Alcohol Blends

Cited by 16 publications

References 38 publications

Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials

Alkali modified Abies bornmulleriana cones as a costeffective biosorbent for enhanced removal of Pb (II) ions, and its comparison with normal biosorbent: Isotherm, kinetic, and thermodynamic parameters

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