Preparation of clay/alumina and clay/alumina/Ag nanoparticle composites for chemical and bacterial treatment of waste water

Yahyaei, Bahareh; Azizian, Saeid; Mohammadzadeh, Abdolmajid; Pajohi‐Alamoti, Mohammadreza

doi:10.1016/j.cej.2014.02.088

Cited by 32 publications

(13 citation statements)

References 27 publications

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“…In addition to the commonly used pseudo first-order and pseudo second-order models, Elovich model and Ritchie nthorder model were also used, and the governing equations are (Ma et al 2009;Yahyaei et al 2014;Yao et al 2011b) where q e (mg/g) and q t (mg/g) are the adsorption capacities of the sample at equilibrium and at time t (min), respectively; k 1 (min −1 ), k 2 (g/(mg·min)), and k n (g n−1 / (mg n−1 ·min)) are the equilibrium rate constants for the pseudo first-order, the pseudo second-order, and nthorder kinetic models; and α (mg/(g·min)) and β (g/mg) are the Elovich constants. Three common types of isotherms, Langmuir isotherm, Freundlich isotherm, and Langmuir-Freundlich isotherm, were applied to describe the equilibrium adsorption.…”

Section: Kinetics and Isothermsmentioning

confidence: 99%

Phosphate Adsorption onto Granular-Acid-Activated-Neutralized Red Mud: Parameter Optimization, Kinetics, Isotherms, and Mechanism Analysis

Cong

Zhang

et al. 2015

Water Air Soil Pollut

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Powdered-acid-activated-neutralized red mud (Aan-RM), the chemico-physically modified product of red mud, was for the first time employed with hydroxypropyl methylcellulose and powdered straw as the main ingredients for granular Aan-RM production for phosphate removal. In order to better understand the phosphate adsorption characteristics of granular Aan-RM, the influence of operational parameters on the performance of granular Aan-RM and the possible adsorption mechanisms involved were investigated. The results demonstrated that the adsorbent dosage, adsorption temperature, and initial solution pH influenced the adsorption performance of granular Aan-RM significantly. The maximum phosphate adsorption capacity of granular Aan-RM reached 153.227 mg/g with the granular Aan-RM dosage of 3.0 g/L, adsorption temperature of 40°C, and initial solution pH of 6.0. The whole adsorption process was well described by nth-order kinetic model and Langmuir-Freundlich isotherm. Meanwhile, X-ray photoelectron spectroscopy (XPS) analysis of P 2p peak on granular Aan-RM after phosphate adsorption demonstrated that 79.01 % of the phosphate was adsorbed through precipitation and ion exchange mechanisms with strong chemical bonds, and 20.99 % of the phosphate was adsorbed through surface deposition mechanism with weak chemical bonds.

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Section: Kinetics and Isothermsmentioning

confidence: 99%

Phosphate Adsorption onto Granular-Acid-Activated-Neutralized Red Mud: Parameter Optimization, Kinetics, Isotherms, and Mechanism Analysis

Cong

Zhang

et al. 2015

Water Air Soil Pollut

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“…Since the Sips isotherm is the improvement of Freundlich model, its behavior is the same as that of the Freundlich equation except that the Sips equation possesses a finite saturation limit when the concentration is sufficiently high . Sips isotherm has been used by several researchers to interpret their adsorption experimental data Yahyaei et al 2014;. 4.7.…”

Section: Sips Isothermmentioning

confidence: 99%

Clay Materials for Environmental Remediation

Ismadji

Soetaredjo

Ayucitra

2015

SpringerBriefs in Molecular Science

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“…Percentage of ZnO and CuO on ZnO/scoria and CuO/ZnO/scoria were obtained 4.2% and 0.5% respectively (Table 1). X-ray energies equal to 1.43 and 1.64 KeV at both samples, are related to Al 2 O 3 and SiO 2, respectively which are the main constituents of scoria 22 . The XRD patterns of scoria, ZnO/scoria and CuO/ZnO/scoria samples have been depicted in Fig.…”

Section: Characteristics Of Cuo/zno/scoria Samplesmentioning

confidence: 94%

Treatment of textile wastewater under visible LED lamps using CuO/ZnO nanoparticles immobilized on scoria rocks

Mahdizadeh

Aber

2015

RSC Adv.

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ZnO thin film was synthesized by sol-gel method and dip-coated on granular porous natural scoria. CuO nanoparticles were synthesized on ZnO/scoria using a direct crystallization approach in the presence of sodium borohydride. Structure and characterization of ZnO/scoria and CuO/ZnO/scoria nanophotocatalysts were studied by X-ray diffraction (XRD) analysis, energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM) and diffuse reflectance spectroscopy (DRS). Photocatalytic decolorization of acid blue 113 and a textile wastewater were performed using the CuO/ZnO/scoria nanophotocatalyst under LED visible lamps in a continuous open channel reactor. Effect of pH, flow rate, initial dye concentration and coexisting anions were investigated. The higher acid blue 113 decolorization efficiency was obtained equal to 62.45% at pH=5, initial dye concentration of 20 mgL -1 and flow rate of 15 ml min -1 . For a textile wastewater with initial chemical oxygen demand (COD) of 700 mg L -1 , 72% COD removal was obtained at pH= 4 and flow rate of 2 ml min -1 . Experimental MaterialsGranular scoria was obtained from Qorveh mine in Kordestan, west of Iran. AB113 was purchased from Sabet Alvand Company, Hamedan, Iran. Zink acetate dihydrate, oxalic acid, ethanol, CuSO 4 , HNO 3 , NaNO 3 , NaOH, H 2 SO 4 , K 2 Cr 2 O 7 , HgSO 4 , Ag 2 SO 4 , and HCl all were obtained from Merck Company in analytical grade. The textile wastewater containing AB113 with blue color, pH 4.8 ± 0.2, conductivity 3.59 mS cm -1 , and chemical oxygen demand (COD) 700 mg L -1 was obtained from Farsh & Patu factory in Tabriz, Iran. Measurement of AB113An AB113 aqueous solution (20 mg L -1 ) was used to plot its absorbance versus wave length in the range of 200-800 nm and 566 nm was found as the maximum absorbance wavelength. At this wave length the absorbance values of different known solutions of

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Preparation of clay/alumina and clay/alumina/Ag nanoparticle composites for chemical and bacterial treatment of waste water

Cited by 32 publications

References 27 publications

Phosphate Adsorption onto Granular-Acid-Activated-Neutralized Red Mud: Parameter Optimization, Kinetics, Isotherms, and Mechanism Analysis

Phosphate Adsorption onto Granular-Acid-Activated-Neutralized Red Mud: Parameter Optimization, Kinetics, Isotherms, and Mechanism Analysis

Clay Materials for Environmental Remediation

Treatment of textile wastewater under visible LED lamps using CuO/ZnO nanoparticles immobilized on scoria rocks

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