Simple wet-chemical synthesis of superparamagnetic CTAB-modified magnetite nanoparticles using as adsorbents for anionic dye Congo red removal

Saksornchai, Eksuree; Kavinchan, Jutarat; Thongtem, Somchai; Thongtem, Titipun

doi:10.1016/j.matlet.2017.11.015

Cited by 32 publications

(8 citation statements)

References 20 publications

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“…For instance, the BET surface area of Co 3 O 4 /ZnO heterostructure reached to the largest level of 60.23 m 2 /g at the zinc acetate concentration of 35.0 mM. Larger surface area with more adsorption centers is more beneficial for the degradation of organic dyes [ 54 ].…”

Section: Resultsmentioning

confidence: 99%

“…The second way of improvement of photo-catalytic activity is caused by the high-specific surface area of the p -Co 3 O 4 / n -ZnO heterostructures. The molecules’ absorption-desorption on the surface of catalyst is the first step in degradation process [ 54 , 62 ]. Consequently, higher surface-to-volume ratio in the developed morphology of p -Co 3 O 4 / n -ZnO heterostructures provides more unsaturated surface coordination sites, as shown in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

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Effect of Zinc Acetate Concentration on Optimization of Photocatalytic Activity of p-Co3O4/n-ZnO Heterostructures

Shi

Liang

et al. 2018

Nanoscale Res Lett

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In this work, p-Co3O4/n-ZnO heterostructures were fabricated on Ni substrate by hydrothermal-decomposition method using cobaltous nitrate hexahydrate (Co(NO3)2·6H2O) and zinc acetate dihydrate (Zn(CH3COO)2·2H2O) as precursors with zinc acetate concentration varying from 5.0 to 55.0 mM. Structure and morphology of the developed samples were characterized by X-ray diffraction (XRD), Raman spectroscopy, and scanning electron microscopy (SEM). Effect of zinc acetate concentration on the photocatalytic activity of p-Co3O4/n-ZnO heterostructures was investigated by degradation of methyl orange (MO) under the UV light irradiation. The fabricated p-Co3O4/n-ZnO heterostructures exhibited higher photocatalytic activity than pure Co3O4 particles. In order to obtain the maximum photocatalytic activity, zinc acetate concentration was optimized. Specifically, at 35 mM of zinc acetate, the p-Co3O4/n-ZnO showed the highest photocatalytic activity with the degradation efficiency of MO reaching 89.38% after 72 h irradiation. The improvement of photocatalytic performance of p-Co3O4/n-ZnO heterostructures is due to the increased concentration of photo-generated holes on Co3O4 surface and the higher surface-to-volume ratio in the hierarchical structure formed by nano-lamellas.Graphical abstract Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2604-4) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of Zinc Acetate Concentration on Optimization of Photocatalytic Activity of p-Co3O4/n-ZnO Heterostructures

Shi

Liang

et al. 2018

Nanoscale Res Lett

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“…In recent times, porous metal oxides have been recognized as excellent solid adsorbents for wastewater treatment owing to their high surface area and the presence of sufficient active surface sites [25][26][27][28] . Among various metal oxides, Fe 3 O 4 nanoparticles (NPs) are drawing considerable attention due to their unique properties such as excellent biocompatibility, low synthetic cost, ease of functionalization, and high magnetic susceptibility leading to easy magnetic recovery [29][30][31][32][33][34] . Owing to the negatively charged surface, bare Fe 3 O 4 NPs have been shown as dye absorbents in many reports [35][36][37] ; however, its applicability is limited due to low adsorption capacity and poor selectivity and recyclability.…”

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confidence: 99%

Selective and Recyclable Congo Red Dye Adsorption by Spherical Fe3O4 Nanoparticles Functionalized with 1,2,4,5-Benzenetetracarboxylic Acid

Chatterjee

Guha

Krishnan

et al. 2020

Sci Rep

120

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In this study, the new material Fe 3 o 4 @BTCA has been synthesized by immobilization of 1,2,4,5-Benzenetetracarboxylic acid (BTCA) on the surface of Fe 3 o 4 NPs, obtained by co-precipitation of FeCl 3 .6H 2 o and fecl 2 .4H 2 O in the basic conditions. Characterization by P-XRD, FE-SEM, and TEM confirm Fe 3 o 4 has a spherical crystalline structure with an average diameter of 15 nm, which after functionalization with BTCA, increases to 20 nm. Functionalization also enhances the surface area and surface charge of the material, confirmed by BET and zeta potential analyses, respectively. The dye adsorption capacity of Fe 3 o 4 @BTCA has been investigated for three common dyes; Congo red (C.R), Methylene blue (M.B), and Crystal violet (C.V). The adsorption studies show that the material rapidly and selectively adsorbs C.R dye with very high adsorption capacity (630 mg/g), which is attributed to strong H-bonding ability of BTCA with C.R dye as indicated by adsorption mechanism study. The material also shows excellent recyclability without any considerable loss of adsorption capacity. Adsorption isotherm and kinetic studies suggest that the adsorption occurs by the Langmuir adsorption model following pseudo-second-order adsorption kinetics.

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“…Moreover, the higher-specific surface area fabricated after annealing may additionally improve the overall photocatalytic activity of 2D TiO 2 -Ga 2 O 3 n-p heterostructures. The absorption and desorption of molecules on the surface of the catalyst is the first step in the degradation process [46, 47]. Thus, higher surface-to-volume ratio in the surface morphology of the TiO 2 -Ga 2 O 3 n-p heterostructures provides more unsaturated surface coordination sites.…”

Section: Resultsmentioning

confidence: 99%

Wafer-Scale Fabrication of Sub-10 nm TiO2-Ga2O3 n-p Heterojunctions with Efficient Photocatalytic Activity by Atomic Layer Deposition

Han

Xia

et al. 2019

Nanoscale Res Lett

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Wafer-scale, conformal, two-dimensional (2D) TiO 2 -Ga 2 O 3 n-p heterostructures with a thickness of less than 10 nm were fabricated on the Si/SiO 2 substrates by the atomic layer deposition (ALD) technique for the first time with subsequent post-deposition annealing at a temperature of 250 °C. The best deposition parameters were established. The structure and morphology of 2D TiO 2 -Ga 2 O 3 n-p heterostructures were characterized by the scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), etc. 2D TiO 2 -Ga 2 O 3 n-p heterostructures demonstrated efficient photocatalytic activity towards methyl orange (MO) degradation at the UV light ( λ = 254 nm) irradiation. The improvement of TiO 2 -Ga 2 O 3 n-p heterostructure capabilities is due to the development of the defects on Ga 2 O 3 -TiO 2 interface, which were able to trap electrons faster. Graphical Abstract

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Simple wet-chemical synthesis of superparamagnetic CTAB-modified magnetite nanoparticles using as adsorbents for anionic dye Congo red removal

Cited by 32 publications

References 20 publications

Effect of Zinc Acetate Concentration on Optimization of Photocatalytic Activity of p-Co3O4/n-ZnO Heterostructures

Effect of Zinc Acetate Concentration on Optimization of Photocatalytic Activity of p-Co3O4/n-ZnO Heterostructures

Selective and Recyclable Congo Red Dye Adsorption by Spherical Fe3O4 Nanoparticles Functionalized with 1,2,4,5-Benzenetetracarboxylic Acid

Wafer-Scale Fabrication of Sub-10 nm TiO2-Ga2O3 n-p Heterojunctions with Efficient Photocatalytic Activity by Atomic Layer Deposition

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