Comprehensive investigation of the mechanism for Cr(VI) removal from contaminated water using coconut husk as a biosorbent

Verma, Renuka; Maji, Pradip K.; Sarkar, Sudipta

doi:10.1016/j.jclepro.2021.128117

Cited by 29 publications

(7 citation statements)

References 41 publications

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“…Figure S1b shows the high−resolution Cr2p narrow−spectrum scanning of Zn−AC, Fe−AC, and Cu−AC after Cr(VI) adsorption. The characteristic peaks of Cr(III) appeared near 578 eV and 587 eV, and those of Cr(VI) appeared near 580 eV and 589 eV, which indicated the existence of a reduction reaction during the Cr(VI) adsorption process [ 9 ]. Under the condition of a low pH value, the oxygen−containing functional group would be protonated, which caused part of Cr(VI) to convert to Cr(III) [ 54 ].…”

Section: Resultsmentioning

confidence: 99%

“…Under the condition of a low pH value, the oxygen−containing functional group would be protonated, which caused part of Cr(VI) to convert to Cr(III) [ 54 ]. The reduction reactions of Cr(VI) are as follows [ 9 , 54 ]:

…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, it can damage the liver and lungs of organisms, and cause skin ulceration [ 8 ]. Coagulation, precipitation−/redox−assisted coagulation, ion exchange, membrane treatment, and adsorption are the conventional methods for the removal of Cr(VI) from polluted water [ 9 ]. However, adsorption has been widely used because of its cost−effectiveness, sustainability, versatility, and easy operation [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

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Study on the Pyrolysis and Adsorption Behavior of Activated Carbon Derived from Waste Polyester Textiles with Different Metal Salts

Zhou

Zhong²,

Wang³

et al. 2022

Materials

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In this study, the effects of the catalysis of heavy metals on the pyrolysis of waste polyester textiles (WPTs) and the adsorption behaviors of the pyrolysis products of WPTs for Cr(VI) were explored. TG−DTG analysis indicated that the metal ions catalyzed the pyrolysis process by reducing the temperature of the decomposition of WPTs. The surface morphology and pore structure of the carbons were analyzed using SEM and BET. The results demonstrated that Zn−AC possessed the largest specific surface area of 847.87 m2/g. The abundant acidic functional groups on the surface of the activated carbons were proved to be involved in the Cr(VI) adsorption process via FTIR analysis. Cr(VI) adsorption experiments indicated that the adsorption process was more favorable at low pH conditions, and the maximum adsorption capacities of Zn−AC, Fe−AC, and Cu−AC for Cr(VI) were 199.07, 136.25, and 84.47 mg/g, respectively. The FTIR and XPS analyses of the carbons after Cr(VI) adsorption, combined with the adsorption kinetics and isotherm simulations, demonstrated that the adsorption mechanism includes pore filling, an electrostatic effect, a reduction reaction, and complexation. This study showed that metal salts catalyze the pyrolysis processes of WPTs, and the activated carbons derived from waste polyester textiles are promising adsorbents for Cr(VI) removal.

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Section: Resultsmentioning

confidence: 99%

…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on the Pyrolysis and Adsorption Behavior of Activated Carbon Derived from Waste Polyester Textiles with Different Metal Salts

Zhou

Zhong²,

Wang³

et al. 2022

Materials

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“…Besides, the elementary analysis results showed that the pure carbon had a 2.15 wt% of nitrogen. The small fraction of nitrogen present in the sample was the residual of coconut shell husk remaining after pyrolysis [20]. The results obtained from FTIR analysis for pure g-C 3 N 4 , pure carbon, and C/g-C 3 N 4 composites are shown in Figure 3.…”

Section: Sem-edx Analysismentioning

confidence: 99%

Enhanced Sonocatalytic Performance of Non-Metal Graphitic Carbon Nitride (g-C3N4)/Coconut Shell Husk Derived-Carbon Composite

et al. 2022

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This study focused on the modification of graphitic carbon nitride (g-C3N4) using carbon which was obtained from the pyrolysis of coconut shell husk. The sonocatalytic performance of the synthesized samples was then studied through the degradation of malachite green. In this work, pure g-C3N4, pure carbon and carbon/g-C3N4 composites (C/g-C3N4) at different weight percentages were prepared and characterized by using XRD, SEM-EDX, FTIR, TGA and surface analysis. The effect of carbon amount in the C/g-C3N4 composites on the sonocatalytic performance was studied and 10 wt% C/g-C3N4 showed the best catalytic activity. The optimization study was conducted by using response surface methodology (RSM) with a central composite design (CCD) model. Three experimental parameters were selected in RSM including initial dye concentration (20 to 25 ppm), initial catalyst loading (0.3 to 0.5 g/L), and solution pH (4 to 8). The model obtained was found to be significant and reliable with R2 value (0.9862) close to unity. The degradation efficiency of malachite green was optimized at 97.11% under the conditions with initial dye concentration = 20 ppm, initial catalyst loading = 0.5 g/L, solution pH = 8 after 10 min. The reusability study revealed the high stability of 10 wt% C/g-C3N4 as sonocatalyst. In short, 10 wt% C/g-C3N4 has a high potential for industrial application since it is cost effective, reusable, sustainable, and provides good sonocatalytic performance.

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“…Reusing this waste is an alternative to mitigate these problems by producing powder and fiber with specific properties that favor several applications. Fiber is used as raw material for crafts or agricultural input [9] and green coconut husk powder (CHP) as a biosorbent to remove metallic ions resulting from the presence of functional groups containing oxygen, hydroxyl and carbonyl [10][11][12][13] and in the formulation of additives and bioproducts since it is a source of lignin, cellulose and hemicellulose [4,14,15]. Currently, the scientific community is studying the transformation of lignocellulosic biomass into valuable, sustainable environmentally friendly products, such as 5-hydroxymethylfurfural, levulinic acid and levulinate esters [16].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the thermal degradation kinetics of fresh green coconut husk (Cocos nucifera L.) powder and after methyl levulinate production

Silva¹,

Silva²,

Neto³

et al. 2022

Global J. Eng. Tech. Adv.

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This study describes the recycling of green coconut husk powder (CHP) aimed at the sustainable production of methyl levulinate. The preliminary step involved thermogravimetric analysis of green (CHP) and residues after synthesis of methyl levulinate with the catalyst’s aluminum sulfate (CHP-AS) and titanium dioxide (CHP-TD), based on a degradation and determination of activation energy using the Ozawa-Flynn-Wall (OWF) method. Thermogravimetric analyses showed significant differences between the main constituents of CHP, CHP-AS and CHP-TD residues: hemicellulose (18.18, 9.78 and 12.17%), cellulose (44.65, 26.18 and 44.23%) and lignin (20.09, 19.89 and 19.58%), respectively. The methyl levulinate concentration obtained by the reaction between CHP and aluminum sulfate was 16.53 g.L-1, due to the participation of hemicellulose and cellulose. The results showed that the activation energies calculated using the OFW method were 142 kJ.mol-1 (CHP), 125 kJ.mol-1 (CHP-AS) and 180 kJ.mol-1 (CHP-TD).

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Comprehensive investigation of the mechanism for Cr(VI) removal from contaminated water using coconut husk as a biosorbent

Cited by 29 publications

References 41 publications

Study on the Pyrolysis and Adsorption Behavior of Activated Carbon Derived from Waste Polyester Textiles with Different Metal Salts

Study on the Pyrolysis and Adsorption Behavior of Activated Carbon Derived from Waste Polyester Textiles with Different Metal Salts

Enhanced Sonocatalytic Performance of Non-Metal Graphitic Carbon Nitride (g-C3N4)/Coconut Shell Husk Derived-Carbon Composite

Assessment of the thermal degradation kinetics of fresh green coconut husk (Cocos nucifera L.) powder and after methyl levulinate production

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