Adsorption of Arsenic using Low Cost Adsorbents:Guava Leaf Biomass, Mango Bark and Bagasse

Mohan, Devendra; Markandeya,; Dey, Satyahari; Pathak, Pratigya; Shukla, Sheo Prasad

doi:10.18520/cs/v117/i4/649-661

Cited by 32 publications

(12 citation statements)

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“…The linear fitting plots for both the pseudo-first and second-order kinetics model is shown in Figures 12 and 13 for beneficiated, raw, and calcined kaolin adsorbents respectively which showed that a positive linear fitting except that the calcined kaolin in the pseudo-second-order kinetics. Similar reports were recorded for arsenic removals using guava leaf biomass, mango bark, and bagasse as an adsorbent [80,81].…”

Section: Adsorption Kineticssupporting

confidence: 82%

Synthesis and characterization of Ethiopian kaolin for the removal of basic yellow (BY 28) dye from aqueous solution as a potential adsorbent

Aragaw

Angerasa

2020

Heliyon

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In the present research, the kaolin adsorbents (beneficiated, raw powder, and calcined) were prepared from Ethiopian natural kaolin through mechanical, wet, and thermal processes. The geochemical and surface properties of kaolin adsorbent were characterized using FTIR, SEM/EDS, XRD, and XRF. In the batch experiment, basic operation parameters (initial dye concentrations, pH, temperature, contact time, and adsorbent dosage) were examined. Percentage removal efficiency basic yellow 28 (BY28) dye were recorded as 94.79%, 92.08%, and 87.08% onto beneficiated, raw, and calcined kaolin absorbents, respectively at an initial dye concentration of 20 mg/L, solution pH of 9, the temperature of 30 C C, and contact time of 60 min and adsorbent dosage of 1g/ 100L. The molar ratio of SiO 2 /Al 2 O 3 was recorded as 2.911 Percent mass composition of Ethiopian kaolin which is higher than the expected pure kaolinite standard which allows us to classify the kaolin clay as a siliceous one. The calculated values of ΔG 0 for beneficiated adsorbent are-1.243, 1.576, and 4.396 kJ/mol at 303.15, 323.15, and 343.15 K, respectively for 20 mg/L of dye concentration and solution pH of 9, suggests that the thermodynamic behavior at lowest temperature is more feasible and spontaneous as compared with the higher temperature one. A similar fashion was calculated for raw and calcined adsorbents. The negative values of ΔH o and ΔS suggest that the adsorption phenomenon is exothermic and the adsorbate molecules are organized on the solid phase in a more disordered fashion than the liquid phase. The pseudo-first-order and pseudo-second-order models have been used to describe the kinetics in the adsorption processes. The Pseudo-second-order model has been fitted for the BY 28 dye adsorption in the studied concentration range. The adsorption of BY 28 dye for raw and calcined adsorbents follows the Langmuir isotherm and the Freundlich isotherm fitted for the beneficiated adsorbent. The amount of BY28 dye taken up by beneficiated, raw, and calcined kaolin adsorbents was found as 1.896, 1.842, and 1.742 mg/g, respectively at a contact time of 1.0 h, the adsorbent dosage of 1.0 g, initial dye concentration ¼ 20 mg/L and solution pH ¼ 9 at 30 C. The results found that these raw and prepared local kaolin adsorbents have a capacity as low-cost alternatives for the removal of dyes in industrial wastewater.

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Section: Adsorption Kineticssupporting

confidence: 82%

Synthesis and characterization of Ethiopian kaolin for the removal of basic yellow (BY 28) dye from aqueous solution as a potential adsorbent

Aragaw

Angerasa

2020

Heliyon

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“…Table 5 shows the results of the kinetic parameters obtained from the linearization of the pseudo-first order and pseudo-second order models. The results of all the kinetic models evaluated show that the pseudo-second order model presented the best R 2 values (between 0.986 and 0.999) for the adsorption of As, Cd, Pb, and Zn; similar values were reported for cassava peel biosorbents [ 57 ], Platanus orientalis Linn leaves [ 68 ], guava leaf [ 69 ], and rose stems [ 54 ]. The data indicate that there is chemical adsorption by the formation of chemical bonds, between the biosorbents and metal cations at the monolayer level [ 70 , 71 , 72 ], since there would be electron exchange between the sorbent and the adsorbate, through covalent and ion exchange bonds, which would allow for the initial formation of a single layer by the action of the active centers of the biosorbent, with the possibility of the subsequent formation of other layers by physisorption [ 57 , 71 ].…”

Section: Resultssupporting

confidence: 55%

Modified Polymeric Biosorbents from Rumex acetosella for the Removal of Heavy Metals in Wastewater

et al. 2022

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The contamination of water resources by effluents from various industries often contains heavy metals, which cause irreversible damage to the environment and health. The objective was to evaluate different biosorbents from the weed Rumex acetosella to remove metal cations in wastewater. Drying, grinding and sieving of the stems was carried out to obtain the biomass, retaining the fractions of 250 to 500 µm and 500 to 750 µm, which served to obtain the biosorbents in natura (unmodified), acidic, alkaline, and mixed. Proximal analysis, PZC, TOC, removal capacity, influence of pH, functional groups, thermal analysis, structural characteristics, adsorption isotherms, and kinetic study were evaluated. The 250 µm mixed treatment was the one that presented the highest removal percentages, mainly due to the OH, NH, -C-H, COOH, and C-O functional groups achieving the removal of up to 96.14% of lead, 36.30% of zinc, 34.10% of cadmium and 32.50% of arsenic. For contact times of 120 min and an optimum pH of 5.0, a loss of cellulose mass of 59% at 328 °C and a change in the surface of the material were also observed, which allowed for obtaining a topography with greater chelating capacity, and the Langmuir and pseudo-second order models were better fitted to the adsorption data. The new biosorbents could be used in wastewater treatment economically and efficiently.

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“…RL is a constant which indicates the possibility of a process to occur [30]. Its value is deduced by the following relation [31].…”

Section: Ph Effectmentioning

confidence: 99%

Removal of Noxious Cr (VI) and Cr (III) Ions by Hierarchically Tailored Pseudo-Monolithic Silica/Activated Carbon Composite

Melhi¹

2022

MCPS

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In the present study, 2.34 m (average) silica particles with large pore size (363 Å) have been prepared from bulk monoliths by using sol-gel method and were then chemically modified by reaction with a C-18 and was used for the adsorption of Cr (VI)and Cr (III) ions from wastewater. The prepared adsorbent was characterized by Scanning electronic microscope (SEM) and X-ray Diffraction (XRD) analysis before and after the adsorption of Cr (III) and Cr (VI) ions. The amount of Cr (III) and Cr (VI) adsorbed was detected by Atomic Absorption spectroscopy (AAS). The 90 % Cr (VI) and 98 % Cr (III) were achieved at pH3 and, 6 respectively. The process followed pseudo 2 nd order kinetics, Langmuir and Freundlich isotherms well. The ΔG values were -50.02 and -49.62 kJ mol −1 , for Cr(VI) ions and Cr(III) ions respectively, which show spontaneous adsorption of Cr(VI) and Cr(III) ions on to AC surface. ΔH was 44.18 kJ mol -1 for Cr(VI) and 39.55 kJ mol −1 "for Cr(III) ions, are showing the endothermic nature of adsorption. The ΔS (152 J mol -1 K -1 for Cr(VI) and 139.88 mol -1 K -1 for Cr(III) ions) showing sorbate/sorbent complex stability.

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Adsorption of Arsenic using Low Cost Adsorbents:Guava Leaf Biomass, Mango Bark and Bagasse

Cited by 32 publications

References 0 publications

Synthesis and characterization of Ethiopian kaolin for the removal of basic yellow (BY 28) dye from aqueous solution as a potential adsorbent

Synthesis and characterization of Ethiopian kaolin for the removal of basic yellow (BY 28) dye from aqueous solution as a potential adsorbent

Modified Polymeric Biosorbents from Rumex acetosella for the Removal of Heavy Metals in Wastewater

Removal of Noxious Cr (VI) and Cr (III) Ions by Hierarchically Tailored Pseudo-Monolithic Silica/Activated Carbon Composite

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