A Novel Insight into the Adsorption Interactions of Arsenate with a Fe–Si Binary Oxide

Din, Salah Ud; Mahmood, Tahira; Akhtar, Naeem; Shah, Noor S.; Hussain, Sajjad; Imran, Muhammad; Sultana, Sabiha; Rehman, Atta Ur

doi:10.1134/s1061933x19040045

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…The Hanes-Woolf linear form ( Eq. (5) ) of the Langmuir model was used to calculate the values of Langmuir model parameters from the respective curves ( Salah Ud Din et al, 2019 ; Imran et al, 2021 ). …”

Section: Methodsmentioning

confidence: 99%

“…(8) ), ( Gunasundari & Senthil Kumar, 2017 ; Shah et al, 2018 ) and pseudo-second order ( Eq. (9) ) ( Matouq et al, 2015 ; Salah Ud Din et al, 2019 ) were used to simulate the experimental kinetic adsorption of RR-2 and OII ono the surface of NiO-NPs, CuO-NPs and NiO/CuO-NC. where q e presents dyes adsorption at equilibrium; q t is dye adsorption with respect to time t and k 1 israte constant of pseudo-first order.…”

Section: Methodsmentioning

confidence: 99%

“… where q e presents dyes adsorption at equilibrium; q t is dye adsorption with respect to time t and k 1 israte constant of pseudo-first order. The slope ( k 1 /2.033) and intercept (log ( q e )) of the curve between log ( q e - q t ) versus t were used to calculate the values of model parameters ( Salah Ud Din et al, 2019 ; Imran et al, 2021 ). Equation (9) shows the pseudo 2nd order kinetic model, where k 2 is pseudo-second-order rate constant.…”

Section: Methodsmentioning

confidence: 99%

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Photocatalysis and adsorption kinetics of azo dyes by nanoparticles of nickel oxide and copper oxide and their nanocomposite in an aqueous medium

Ahsan

Shahid

Imran

et al. 2022

PeerJ

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Background Azo dyes are recalcitrant organic pollutants present in textile industry effluents. Conventional treatment methods to remove them come with a range of disadvantages. Nanoparticles and their nanocomposites offer more efficient, less expensive and easy to handle wastewater treatment alternative. Methods In this study, nanoparticles of nickel oxide (NiO-NPs), copper oxide (CuO-NPs) and their nanocomposite (NiO/CuO-NC) were synthesized using co-precipitation method. The functional groups present on the surface of synthesized nanomaterials were verified using Fourier-transform infrared spectroscopy (FTIR). Surface morphology was assessed using scanning electron microscopy (SEM) whereas purity, shape and size of the crystallite were determined using X-ray diffraction (XRD) technique. The potential of these nanomaterials to degrade three dyes i.e., Reactive Red-2 (RR-2), Reactive Black-5 (RB-5) and Orange II sodium salt (OII) azo dyes, was determined in an aqueous medium under visible light (photocatalysis). The photodegradation effectiveness of all nanomaterials was evaluated under different factors like nanomaterial dose (0.02–0.1 g 10 mL−1), concentration of dyes (20–100 mg L−1), and irradiation time (60–120 min). They were also assessed for their potential to adsorb RR-2 and OII dyes. Results Results revealed that at optimum concentration (60 mgL−1) of RR-2, RB-5, and OII dyes, NiO-NPs degraded 90, 82 and 83%, CuO-NPs degraded 49, 34, and 44%, whereas the nanocomposite NiO/CuO-NC degraded 92, 93, and 96% of the said dyes respectively. The nanomaterials were categorized as the efficient degraders of the dyes in the order: NiO/CuO-NC > NiO-NPs > CuO-NPs. The highest degradation potential shown by the nanocomposite was attributed to its large surface area, small particles size, and quick reactions which were proved by advance analytical techniques. The equilibrium and kinetic adsorption of RR-2 and OII on NiO-NPs, CuO-NPs, and NiO/CuO-NC were well explained with Langmuir and Pseudo second order model, respectively (R2 ≥ 0.96). The maximum RR-2 adsorption (103 mg/g) was obtained with NiO/CuO-NC. It is concluded that nanocomposites are more efficient and promising for the dyes degradation from industrial wastewater as compared with dyes adsorption onto individual NPs. Thus, the nanocomposite NiO/CuO-NC can be an excellent candidate for photodegradation as well as the adsorption of the dyes in aqueous media.

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Section: Methodsmentioning

confidence: 99%