Nigella sativa seed based nanocomposite-MnO2/BC: An antibacterial material for photocatalytic degradation, and adsorptive removal of Methylene blue from water

Siddiqui, Sharf Ilahi; Manzoor, Ovais; Mohsin, Mohd; Chaudhry, Saif Ali

doi:10.1016/j.envres.2018.11.044

Cited by 136 publications

(35 citation statements)

References 65 publications

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“…The Nigella Sativa seeds used in this study had high uptake for Pb(II) than Cr(VI) compared to the uptake of 10.07 mg/g for methylene blue reported by [14,15]. Other adsorption studies on magnetized Nigella Sativa seeds for the removal of methylene blue dye had higher uptake compared to this study [16,17].…”

Section: Discussionmentioning

confidence: 47%

Magnetite Functionalized Nigella Sativa Seeds for the Uptake of Chromium(VI) and Lead(II) Ions from Synthetic Wastewater

Thabede

Shooto

Xaba

et al. 2021

Adsorption Science & Technology

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The aim of the present study was to utilise pristine and magnetite-sucrose functionalized Nigella Sativa seeds as the adsorbents for the uptake of chromium(VI) and lead(II) ions from synthetic wastewater. Prestine Nigella Sativa seeds were labelled (PNS) and magnetite-sucrose functionalized Nigella Sativa seeds (FNS). The PNS and FNS composites were characterized by Fourier-transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD). The FTIR analysis of both adsorbents revealed the presence of vibrations assigned to 1749 and 1739 cm-1 (-C=O) for ketonic group for both adsorbents. The amide (-NH) peak was observed at 1533 and 1527 cm-1 on FNS and PNS composites, respectively, whilst the carboxyl group (-COOH) were observed at 1408 cm-1 on both adsorbents. The XRD results of FNS and PNS composites showed a combination of spinel structure and y -Fe2O3 phase confirming the formation of iron oxide. The influence of operational conditions such as initial concentration, temperature, pH, and contact time was determined in batch adsorption system. The kinetic data of Cr(VI) and Pb(II) ions on both adsorbents was described by pseudo-first-order (PFO) model which suggested physisorption process. The sorption rate of Cr(VI) ions was quicker, it attained equilibrium in 20 min, and the rate of Pb(II) ions was slow in 90 min. Freundlich isotherm described the mechanism of Pb(II) ions adsorption on PNS and FNS composites. Langmuir best fitted the uptake of Cr(VI) ions on PNS and FNS. The results for both adsorbents showed that the removal uptake of Pb(II) ions increased when the initial concentration was increased; however, Cr(VI) uptake decreased when the initial concentration increased. The adsorption of Cr(VI) and Pb(II) ions on both adsorbents increased with temperature.

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Section: Discussionmentioning

confidence: 47%

Magnetite Functionalized Nigella Sativa Seeds for the Uptake of Chromium(VI) and Lead(II) Ions from Synthetic Wastewater

Thabede

Shooto

Xaba

et al. 2021

Adsorption Science & Technology

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“…Positive values of ΔS° reflect a increase in the degree of disorderliness at the adsorption interface during the adsorption of Cr(VI). The endothermic nature of the adsorption process by various nutshells was confirmed by the positive values of ΔH° [10,42].…”

Section: Thermodynamic Studiesmentioning

confidence: 83%

Adsorptive removal of Cr(VI) from aqueous solution: kinetic, isotherm, thermodynamics, toxicity, scale-up design, and GA modeling

2019

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Chromium (VI) is a well-known toxic, industrial, water pollutant which has various, adverse effects on environmental health. Utilization of agricultural waste in effluent water treatment would minimize the problem of water pollution. The present study deals with the use of three types of nut shells for Cr(VI) removal. Adsorbents are characterized, using point of zero charges (pH pzc), FTIR, BET surface area analysis, and SEM. The variation of different operating parameters on metal removal was conducted. The best sorption kinetic model was pseudo-second order. The adsorption process is both physical and chemical, and this depends on temperature. The Cr(VI) adsorption is spontaneous and endothermic. According to isotherm studies, Langmuir isotherm model fits fairly well for all adsorbents. Regeneration studies suggest that the adsorbents have proper regeneration criteria and can be used for multiple times. Study on RBC count of Gallus gallus domesticus gives concrete evidence of deadly effects of Cr(VI). It also figures out that the effluent solution treated with bio-adsorbents is less harmful. The scale-up design procedure is reported here. This study proved that groundnut shell, walnut shell, and almond shell have immense potential and can be utilized even after regeneration as replacement of commercial adsorbents for industrial wastewater. GA-ANN modeling has been developed for the best possible wastewater treatment management. Keywords Groundnut shell • Walnut shell • Almond shell • Pseudo-second order • Langmuir model • Genetic algorithm List of symbols A H Harkins-Jura isotherm constant A T Equilibrium binding constant of Temkin isotherm (L/g) a e Adsorption rate (initial) (mg/(g min)) B Heat of adsorption (J/mol) B H Harkins-Jura isotherm constant b Constant of Langmuir model (L/mg) b e Chemisorption activation energy (g/mg) b T Constant of Temkin isotherm C External convective mass transfer (mg/g) C a Cr(VI) ion concentration at the adsorbent at equilibrium (mg/L) C 0 Cr(VI) ion concentration (initial) (mg/L) C e Cr(VI) ion concentration at equilibrium (mg/L) C t Ion concentration of Cr(VI) at time t (mg/L) D e Absorbate's effective diffusion coefficient in the absorbent phase (m 2 /s) E Adsorption free energy (KJ/mol) ΔG 0 Gibbs free energy change (kJ/mol) ΔH 0 Enthalpy change (kJ/mol) K Fractional power model constant (mg/g) k 1 Rate constant of Lagergren model (min −1) k 2 Rate constant of pseudo-second-order model (g/ mg min) K ad Rate constant of Natarajan and Khalaf model (min −1) K f Constant of Freundlich model (mg/g)/(mg/L) 1/n k i Rate constant of intraparticle diffusion model (mg/(g min 0.5)) K 0 c Thermodynamic equilibrium constant K ∕ c Apparent equilibrium constant

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“…These waste materials prior to their application as adsorbents are subjected to various processes like chemical treatment, conversion to powder form, and decomposition. 60,[121][122][123] In view of this, different waste materials to adsorb toxic dyes from contaminated water are described below.…”

Section: Non-conventional Adsorbentsmentioning

confidence: 99%

“…Agricultural waste materials, like raw maize cob, exhausted coffee ground powder, saw-dust, black cumin, neem leaf, pineapple leaf, and pine tree leaves, have been used by many researchers in the dye remediation from contaminated water. 60,[121][122][123][124][125] Abubakar and Ibrahim (2019) used raw maize 21 cob for the adsorption of bromophenol blue (96.5%) and bromothymol blue (94.4%) present in the wastewater at the equilibrium time of 125 and 110 minutes, respectively. The effect of increasing initial dye concentration on dye adsorption showed positive effects, and dye adsorption followed the Temkin isotherm model.…”

Section: Agricultural Waste Materialsmentioning

confidence: 99%

Recent advances on the removal of dyes from wastewater using various adsorbents: a critical review

et al. 2021

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Nigella sativa seed based nanocomposite-MnO2/BC: An antibacterial material for photocatalytic degradation, and adsorptive removal of Methylene blue from water

Cited by 136 publications

References 65 publications

Magnetite Functionalized Nigella Sativa Seeds for the Uptake of Chromium(VI) and Lead(II) Ions from Synthetic Wastewater

Magnetite Functionalized Nigella Sativa Seeds for the Uptake of Chromium(VI) and Lead(II) Ions from Synthetic Wastewater

Adsorptive removal of Cr(VI) from aqueous solution: kinetic, isotherm, thermodynamics, toxicity, scale-up design, and GA modeling

Recent advances on the removal of dyes from wastewater using various adsorbents: a critical review

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