Development of Nano-Hydroxyapatite Embedded Gelatin Biocomposite for Effective Chromium(VI) Removal

Gopalakannan, Venkatrajan; Viswanathan, Natrayasamy

doi:10.1021/acs.iecr.5b01224

Cited by 55 publications

(21 citation statements)

References 50 publications

(54 reference statements)

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“…a, when the pH of the chromium solution is in the range of 2–10, the chromium removal percentage of the PPy/Co 3 O 4 /AgCl composite decreases from 99.88% to 99.68%. Moreover, with the increase in the pH, the chromium removal percentage of the PPy/Co 3 O 4 /AgCl composite decreased slightly . That is, the as‐synthesized PPy/Co 3 O 4 /AgCl composite is suitable for chromium reduction in a wide pH range.…”

Section: Resultsmentioning

confidence: 92%

Preparation of doped polypyrrole composites as effective chromium ion absorbents

Zhou

Sun

2017

Polymer Composites

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A novel Co 3 O 4 -and AgCl-doped three-dimensional architectures polypyrrole (PPy/Co 3 O 4 /AgCl) composite was demonstrated as an excellent adsorbent to remove chromium effectively by an in situ oxidation polymerization using FeCl 3 as the oxidant. The achieved adsorption capacity was 69.9 mg g 21 . The as-synthesized PPy/ Co 3 O 4 /AgCl composite is suitable for chromium adsorption in a wide pH range. A chemical rather than a physical adsorption occurred for these adsorbents as revealed by a pseudo-second-order kinetic study. The results of the adsorption isotherms showed that the adsorption process was similar to the Langmuir isotherm adsorption. Furthermore, the PPy/Co 3 O 4 /AgCl composite exhibited a high stability for chromium adsorption during recycling tests process. POLYM. COMPOS., 00:000-000,

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Section: Resultsmentioning

confidence: 92%

Preparation of doped polypyrrole composites as effective chromium ion absorbents

Zhou

Sun

2017

Polymer Composites

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“…The pH drift method was used to determine the zero point charge (pH pzc ) of NCS/SA beads (Gopalakannan & Viswanathan, ). Fifty milliliters of NaCl solution (0.01 M) was taken in a series of fives flasks, at different initial pH values between 2.0 and 10.02.…”

Section: Methodsmentioning

confidence: 99%

Uptake of Pb(II) onto nanochitosan/sodium alginate hybrid beads: Mechanism and kinetics study

Ablouh

Essaghraoui

Eladlani

et al. 2019

Water Environment Research

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Nanochitosan/sodium alginate (NCS/SA) beads were prepared using nanochitosan and alginate as a high-performance absorbent for Pb(II) removal from aqueous solution. The morphology, structure, thermal stability, surface area, and elements present in the NCS/SA beads before and after adsorption were characterized using instrumental techniques like SEM, FTIR, TGA, BET, and EDX analysis, respectively. Various adsorption parameters were studied. The results indicated that the equilibrium adsorption data were fitted to Langmuir isotherms and the maximum Langmuir monolayer capacity of Pb(II) was 178.57 mg/g at 45°C. The adsorption process was in good agreement with pseudo-first-order kinetic model. Mechanism studies showed that electrostatic interaction and ion exchange were the major mechanisms for lead (II) removal by the NCS/SA beads. The results of this study indicate that NCS/SA beads could be used as an effective adsorbent for the elimination of lead (II) present in aqueous solution. • Practitioner points• Nanochitosan/sodium alginate beads were synthesized using Ca 2+ as a crosslinking agent. • NCS/SA beads were used to remove Pb(II) for the first time and working parameters were optimized. • Adsorption monolayer capacity of NCS/SA adsorbent towards Pb (II) was found to be 178.57 mg/g.

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“…e di raction peaks occurred at 2θ 25.8°, 32.1°, 33.9°, 39.5°, 46.8°, 49.7°, and 53.5°, corresponding to HAP crystal face (002), (211), (202), (310), (222), (213), and (004), respectively (JCPDS number 03-0747) [19,22]. It indicated that HAP was all formed with di erent molar ratio of chitosan to imidazole-4,5-dicarboxylic acid (3 : 1, 2 : 1, 1 : 1, 1 : 2, and 1 : 3).…”

Section: Influence Of Molar Ratio Of Chitosan/imidazole-45-dicarboxymentioning

confidence: 99%

“…Nanohydroxyapatite embedded gelatin composite was prepared by Gopalakannan, which was used as a biocompatible sorbent to the removal of hexavalent chromium from aqueous solution in batch mode. e adsorption capacity can reach 170 mg·g −1 , and the sorption of chromium(VI) onto Nanohydroxyapatite embedded gelatin biocomposite follows Langmuir isotherm [19].…”

Section: Introductionmentioning

confidence: 99%

Biomimetic Synthesis of Hydroxyapatite in Presence of Imidazole-4,5-dicarboxylic Acid Grafted Chitosan for Removing Chromium(VI)

Chen

Huang

et al. 2018

Journal of Nanotechnology

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In order to biomimetic synthesize hydroxyapatite similar to natural bone. Hydroxyapatite (HAP) is biomimetic synthesized in simulated body fluid (SBF) by addition of imidazole-4,5-dicarboxylic acid grafted chitosan (IDACS). e effect of molar ratio of chitosan (CS) to imidazole-4,5-dicarboxylic acid (IDA) on preparation of HAP was investigated. e structure, size, and crystal phase of the obtained hydroxyapatite were observed by Fourier transform infrared spectroscopy, X-ray powder diffraction, and scanning electron microscopy. e results show that the molar ratio of CS to IDA is 1 : 3, the temperature is 37.0°C, the aging time is 48 h, the synthesized nanorod-like hydroxyapatite with diameter 20-30 nm, and length ranging from 75 to 120 nm presents excellent phase, which disperses well and is similar to the natural bone of HAP. e obtained HAP can be used to remove chromium(VI) by the orthogonal experiments, and the results indicated that the removal rate can reach 95.66% under the optimum conditions. ese results suggest that the morphology of the obtained HAP is more affected by the material ratio of chitosan to imidazole-4,5-dicarboxylic acid than its structure, and the obtained HAP can effectively remove Cr(VI), which provides a novel method for biomimetic synthesis of other biomaterials and application in the water purification.

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Development of Nano-Hydroxyapatite Embedded Gelatin Biocomposite for Effective Chromium(VI) Removal

Cited by 55 publications

References 50 publications

Preparation of doped polypyrrole composites as effective chromium ion absorbents

Preparation of doped polypyrrole composites as effective chromium ion absorbents

Uptake of Pb(II) onto nanochitosan/sodium alginate hybrid beads: Mechanism and kinetics study

Biomimetic Synthesis of Hydroxyapatite in Presence of Imidazole-4,5-dicarboxylic Acid Grafted Chitosan for Removing Chromium(VI)

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