Removal of malachite green from aqueous solutions by cuprous iodide–cupric oxide nano-composite loaded on activated carbon as a new sorbent for solid phase extraction: Isotherm, kinetics and thermodynamic studies

Nekouei, Farzin; Noorizadeh, Hossein; Nekouei, Shahram; Asif, Mohammad; Tyagi, Inderjeet; Agarwal, Shilpi; Gupta, Vinod Kumar

doi:10.1016/j.molliq.2015.07.058

Cited by 51 publications

(13 citation statements)

References 78 publications

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“…At pH more than 7, the adsorption decreased slightly owing to reduction according to Eq. (7) It was observed that the solution turned brownish at the end of 12 h with a rise in initial concentration of Mn(VII) and pH; this may be due to reduction of MnO 4 ions to MnO 2 according to Eq. (8) The IR spectrum of CuI before and after adsorption of Mn(VII) ion was scanned between 4000 and 500 cm −1 .…”

Section: Effect Of Initial Concentration and Phmentioning

confidence: 99%

“…One of the reasons for water crisis is also due to the increasing level of heavy metal pollution through rapid industrialization [6]. Several industries release huge amount of toxic effluents containing heavy metals, dyes, organic as well as inorganic impurities into the nearby aquatic streams without any treatment [7]. In recent times heavy metals are found to be one of the major environmental pollutants, which pose a risk to the environment [8].…”

Section: Introductionmentioning

confidence: 99%

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Application of green synthesized nanocrystalline CuI in the removal of aqueous Mn(VII) and Cr(VI) ions

Archana¹,

Yogalakshmi²,

Rajagopal³

2019

SN Appl. Sci.

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Purging of heavy metals like chromium and manganese from water using various adsorbents is the need of the hour for our environment. Copper iodide nanoparticle (CuI NP) has garnered a lot of attention due to its singular physical and chemical properties. The present study reports the of use of green synthesized CuI NP using Hibiscus rosa-sinensis L. flower extract which contains the anthocyanin, cyanidin-3-sophoroside (acts as both reducing and capping agents) in the removal of aqueous Cr(VI) and Mn(VII) ions. The synthesized CuI NP was characterized and was found to be nanocrystalline in nature, showing the presence of some surface crystal defects and having a high surface area making it a good adsorbent with adsorption capacities of 169.5 mg/g for Cr(VI) and 200 mg/g for Mn(VII) ions. The kinetics of metal removal was probed. The removal of metals was also probed using Freundlich and Langmuir adsorption models.

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Section: Effect Of Initial Concentration and Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of green synthesized nanocrystalline CuI in the removal of aqueous Mn(VII) and Cr(VI) ions

Archana¹,

Yogalakshmi²,

Rajagopal³

2019

SN Appl. Sci.

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“…The pH has a crucial impact on the adsorption capacity of adsorbent and removal efficiency via changing the adsorption chemistry of adsorbent-adsorbate (Nekouei et al 2016b). The pH-related experiments were carried out in the various pH values (4-10) with 20 mg of photocatalyst into 100 mL of the dye solution (10 mg L −1 ) at the optimum contact time.…”

Section: Effect Of Phmentioning

confidence: 99%

Synthesis of ZnO nanostructure using activated carbon for photocatalytic degradation of methyl orange from aqueous solutions

et al. 2018

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In this research, zinc oxide (ZnO) nanostructure was prepared by using zinc acetate (as precursor) and carboxylic derivative of activated carbon (as matrix). Activated carbon was modified by oxidation with nitric acid to get carboxylic derivative (AC-COOH). Then, zinc was loaded on the surface of modified activated carbon by an impregnation method. The ZnO nanostructure was characterized by BET, XRD and SEM that confirmed achieving of ZnO nanoparticles with a size of 21-31 nm and surface area of 17.78 m 2 gr −1. The efficiency of the catalyst was evaluated in the photocatalytic decomposition of aqueous solution of azo dye methyl orange (MO). Major parameters such as pH, dose of catalyst, stirring effect, initial concentration of dye and solution oxygen effect were considered. Activity measurements under UV radiation showed acceptable results for the photodegradation of MO. The efficiency of catalyst prepared with non-modified activated carbon for the photodegradation of MO was also evaluated. The results confirmed that ZnO prepared using carboxylic derivative of activated carbon as matrix had better photocatalytic activity than ZnO prepared by non-modified carbon matrix.

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“…24 Copper oxide (CuO), a great p-type semiconductor with a narrow band gap of 1.2 eV, has attracted full attention as a capable photocatalyst under irradiation of sunlight. 25 Several studies have indicated that BC modified with CuO can increase the porosity, 26 enlarge the surface area, 27 reduce the sensitivity of BC to solution pH value, 28 and introduce hydrophilic environment over BC. 29 All these changes could improve the adsorption capacity of BC to different kinds of aqueous contaminants.…”

Section: Introductionmentioning

confidence: 99%

Facile Ball-Milling Synthesis of CuO/Biochar Nanocomposites for Efficient Removal of Reactive Red 120

et al. 2020

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With the goal of improving the removal of anionic contaminants, copper oxide (CuO)-modified biochar (BC) nanocomposites were successfully prepared through simply ball milling CuO particles with BC. The physicochemical properties of the fabricated CuO/BC nanocomposites were systematically characterized by a series of techniques; their adsorption performances were assessed, and the main adsorption mechanism was revealed. X-ray powder diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy analyses of the nanocomposites showed the strong interaction between CuO and BC and confirmed the success of the ball-milling syntheses. Because of strong electrostatic attraction between the embedded CuO nanoparticles and reactive red (RR120), the composited adsorbents exhibited excellent RR120 removal. The 10%-CuO/BC nanocomposite achieved the best RR120 removal efficiency (46%), which is much higher than that of pristine BC (20%). In addition, the adsorption was insensitive to the change of solution initial pH (4−10). The 10%-CuO/BC also showed fast adsorption kinetics (equilibrium time < 3 h) and extremely high adsorption capacity (Langmuir maximum capacity of 1399 mg g −1 ) to RR120 in aqueous solutions. Findings from this study demonstrate not only the strong feasibility of ball-milling synthesis of BC-based nanocomposites but also the promising potential of the CuO/BC nanocomposites to remove aqueous anionic contaminants.

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Removal of malachite green from aqueous solutions by cuprous iodide–cupric oxide nano-composite loaded on activated carbon as a new sorbent for solid phase extraction: Isotherm, kinetics and thermodynamic studies

Cited by 51 publications

References 78 publications

Application of green synthesized nanocrystalline CuI in the removal of aqueous Mn(VII) and Cr(VI) ions

Application of green synthesized nanocrystalline CuI in the removal of aqueous Mn(VII) and Cr(VI) ions

Synthesis of ZnO nanostructure using activated carbon for photocatalytic degradation of methyl orange from aqueous solutions

Facile Ball-Milling Synthesis of CuO/Biochar Nanocomposites for Efficient Removal of Reactive Red 120

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