Uptake of Pb(II) ion From Aqueous Solution Using Silk Cotton Hull Carbon: An Agricultural Waste Biomass

Shanmugavalli, R.; Shabudeen, P. S. Syed; Venckatesh, Rajendran; Kadirvelu, K.; Madhavakrishnan, S.; Pattabhi, S.

doi:10.1155/2006/496309

Cited by 9 publications

(6 citation statements)

References 25 publications

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“…When the pH was higher than the optimum pH (beyond the pH values of 6.0 for Pb, 7.0 for Zn and Cu, and 8.0 for Cd (Fig. 3)) the metal ions may get converted to their hydroxides, and this resulted in a decrease in the removal of metals by the active sites of the ACPAH [42,[46][47][48]. Further, the sorption process of metals by the ACPAH is kinetically faster than the precipitation of metal hydroxides under higher pH.…”

Section: Effect Of Solution Phmentioning

confidence: 99%

Removal of some metal ions by activated carbon prepared from Phaseolus aureus hulls

Rao

Ramana

Seshaiah

et al. 2009

Journal of Hazardous Materials

278

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Section: Effect Of Solution Phmentioning

confidence: 99%

Removal of some metal ions by activated carbon prepared from Phaseolus aureus hulls

Rao

Ramana

Seshaiah

et al. 2009

Journal of Hazardous Materials

278

View full text Add to dashboard Cite

“…It is in this logic that, for some time, researchers have been investigating the development of less expensive methods, including adsorption on adsorbents at a lower cost [15][16][17]. ese less expensive adsorbents can be simple biomasses or activated carbons prepared from agroindustrial residues [18][19][20]. Tropical Africa is full of potential valuable fruit species which are not only abundant but also available almost round the year.…”

Section: Introductionmentioning

confidence: 99%

Optimized Removal of Hydroquinone and Resorcinol by Activated Carbon Based on Shea Residue (Vitellaria paradoxa): Thermodynamics, Adsorption Mechanism, Nonlinear Kinetics, and Isotherms

Amola

Kamgaing

Tagne

et al. 2022

Journal of Chemistry

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The present work demonstrates the adsorption of hydroquinone (HQ) and resorcinol (R) by activated carbon based on shea residue (Vitellaria paradoxa). The adsorbent was prepared chemically by impregnation with sulfuric acid and coded by the acronym CAK-S. The central composite design (CCD) was used to optimize the main factors that influence the adsorption of HQ or R by activated carbon such as the initial concentration, the pH of the solution, the contact time, and the mass of the carbon on the expected response, which is the adsorbed quantity of the target pollutants. The optimal conditions obtained from the statistical analysis are as follows: concentration of 158 mg/L, pH 3, time of 120 min, and mass of 50 mg for the adsorption of HQ and concentration of 180 mg/L, pH 3, time of 86 min, and mass of 118 mg for the adsorption of R. The maximum quantities of HQ and R adsorbed are 45.02 mg/g and 33.65 mg/g, respectively. The analysis of variance (ANOVA) showed a good relationship between the variables involved with the coefficients of determination R2 = 98.69% for the adsorption of hydroquinone and R2 = 90.55% for that of resorcinol, which means that the model is more suitable to express the adsorbed amount according to the four optimized parameters. The experimental data obtained under these optimal conditions were simulated with two and three parameter nonlinear isotherm models as well as kinetic models. The results show that Elovich kinetic model better describes the adsorption of HQ and R, indicating chemisorption with heterogeneous active sites on the surface of CAK-S. Temkin’s two-parameter model shows that adsorption occurs on heterogeneous surfaces with a nonuniform adsorption energy distribution at the surface and Sips’s three-parameter model confirms the heterogeneity of the surface with a localized adsorption of HQ or R by CAK-S. The thermodynamics study has shown that the adsorption is endothermic ( Δ H 0 > 0 ) and spontaneous ( Δ G 0 < 0 ).

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“…When the pH is higher than the optimum pH (in our study pH optimal = 6), the metal ions may get converted to their hydroxides, resulting in a decrease in the removal of metals by the active sites of rGO. [ 92 , 93 , 94 , 95 ] For Pb (II), at pH > 6, q e is reduced because the predominant metal ions are Pb(OH) − 3 that cannot be adsorbed on the surface of rGO. [ 96 ] These results also show that among the metals tested, the highest adsorption capacity is for Pb (II) through all pH conditions, while Mn (II) and Cu (II) show the lowest adsorption capacities.…”

Section: Resultsmentioning

confidence: 99%

Effective Removal of Metal ion and Organic Compounds by Non-Functionalized rGO

et al. 2023

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Effective removal of heavy metals from water is critical for environmental safety and public health. This work presents a reduced graphene oxide (rGO) obtained simply by using gallic acid and sodium ascorbate, without any high thermal process or complex functionalization, for effective removal of heavy metals. FTIR and Raman analysis show the effective conversion of graphene oxide (GO) into rGO and a large presence of defects in rGO. Nitrogen adsorption isotherms show a specific surface area of 83.5 m2/g. We also measure the zeta-potential of the material showing a value of −52 mV, which is lower compared to the −32 mV of GO. We use our rGO to test adsorption of several ion metals (Ag (I), Cu (II), Fe (II), Mn (II), and Pb(II)), and two organic contaminants, methylene blue and hydroquinone. In general, our rGO shows strong adsorption capacity of metals and methylene blue, with adsorption capacity of qmax = 243.9 mg/g for Pb(II), which is higher than several previous reports on non-functionalized rGO. Our adsorption capacity is still lower compared to functionalized graphene oxide compounds, such as chitosan, but at the expense of more complex synthesis. To prove the effectiveness of our rGO, we show cleaning of waste water from a paper photography processing operation that contains large residual amounts of hydroquinone, sulfites, and AgBr. We achieve 100% contaminants removal for 20% contaminant concentration and 63% removal for 60% contaminant concentration. Our work shows that our simple synthesis of rGO can be a simple and low-cost route to clean residual waters, especially in disadvantaged communities with low economical resources and limited manufacturing infrastructure.

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Uptake of Pb(II) ion From Aqueous Solution Using Silk Cotton Hull Carbon: An Agricultural Waste Biomass

Cited by 9 publications

References 25 publications

Removal of some metal ions by activated carbon prepared from Phaseolus aureus hulls

Removal of some metal ions by activated carbon prepared from Phaseolus aureus hulls

Optimized Removal of Hydroquinone and Resorcinol by Activated Carbon Based on Shea Residue (Vitellaria paradoxa): Thermodynamics, Adsorption Mechanism, Nonlinear Kinetics, and Isotherms

Effective Removal of Metal ion and Organic Compounds by Non-Functionalized rGO

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