Magnetic modification of acid-activated kaolin: Synthesis, characterization, and adsorptive properties

Gao, Zhan; Li, X.; Wu, Haixia; Zhao, S.; Deligeer, W.; Asuha, S.

doi:10.1016/j.micromeso.2014.09.029

Cited by 47 publications

(25 citation statements)

References 36 publications

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“…The structural iron content can be used to examine the extent of reduction and oxidation of Fe-bearing mineral clay [7]). The interlayer space, surface and edges of clay minerals provide sites to accommodate and stabilize Fe 2 O 3 nanoparticles, thereby leading to the formation of a class of functional nanoparticle/clay minerals such as γ-Fe 2 O 3 /montmorillonite [8], α-Fe 2 O 3 /Na-montmorillonite [9]), Fe 2 O 3 /Fe 3 O 4 /vermiculite [10] and γ-Fe 2 O 3 /kaolinite [11]. The two-dimensional expandable layers of clay minerals provide useful hosts, which facilitate the introduction of catalytically active metal complexes [12].…”

Section: Introductionmentioning

confidence: 99%

α-Fe2O3 Nanoparticles/Vermiculite Clay Material: Structural, Optical and Photocatalytic Properties

et al. 2019

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Photocatalysis is increasingly becoming a center of interest due to its wide use in environmental remediation. Hematite (α-Fe2O3) is one promising candidate for photocatalytic applications. Clay materials as vermiculite (Ver) can be used as a carrier to accommodate and stabilize photocatalysts. Two different temperatures (500 °C and 700 °C) were used for preparation of α-Fe2O3 nanoparticles/vermiculite clay materials. The experimental methods used for determination of structural, optical and photocatalytic properties were X-ray fluorescence (ED-XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray spectrometry (EDS), N2 adsorption method (BET), diffuse reflectance UV-Vis spectroscopy (DRS), photoluminescence spectroscopy (PL) and photocatalytic reduction of CO2, respectively. The data from XRD were confronted with molecular modeling of the material arrangement in the interlayer space of vermiculite structure and the possibility of anchoring the α-Fe2O3 nanoparticles to the surface and edge of vermiculite. Correlations between structural, textural, optical and electrical properties and photocatalytic activity have been studied in detail. The α-Fe2O3 and α-Fe2O3/Ver materials with higher specific surface areas, a smaller crystallite size and structural defects (oxygen vacancies) that a play crucial role in photocatalytic activity, were prepared at a lower calcination temperature of 500 °C.

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Section: Introductionmentioning

confidence: 99%

α-Fe2O3 Nanoparticles/Vermiculite Clay Material: Structural, Optical and Photocatalytic Properties

et al. 2019

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“…Meanwhile, there is no formation Fe based precipitates or oxides and Fe(III) in PHFe(III)/KC is likely attached to the KC surface. If iron was present as iron oxide in the PHFe(III)/KC composite, the corresponding diffraction peaks would be observed in the XRD pattern …”

Section: Resultsmentioning

confidence: 99%

“…Additional treatment of the adsorbent is necessary to improve the adsorption performance. Practically, various treatment methods such as mechanical milling, calcination, and alkali or acid treatment have been reported which are means to increase the sample specific surface area. Milling and calcination methods are considered intense energy‐consuming techniques while acid/alkali treatment further imposes liquid waste disposal issues.…”

Section: Introductionmentioning

confidence: 99%

Environmentally Friendly Treatment of Coal‐Bearing Kaolin by Polyhydroxy‐Iron for Anionic Dye Removal

et al. 2019

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Clay material such as kaolin is considered great candidate in industrial water treatment due to its structural properties and abundancy. However, material treatment procedures aimed for adsorption efficiency improvement are generally energy consuming and causes secondary environment contaminations. In the present study, a cost‐effective kaolin modification technique based on polyhydroxy‐iron (PHFe(III)) treatment is applied to coal‐bearing kaolin clay (KC). The modified adsorbent (PHFe(III)/KC) shows a two fold increase in specific surface area and renders a 75 mg/g Congo Red (CR) dye uptake amount which significantly outperforms that of the raw KC (∼12 mg/g). Importantly, the modification process involves mild heating and gentle chemical reaction which is environmental benign, especially under large scale adsorbent treatment. The effect of the PHFe(III)/KC preparation conditions, adsorption time, the initial solution pH and the initial concentration of CR on the adsorption capacity of the adsorbents was investigated. Adsorbent characterization shows successful grafting of PHFe(III) which likely changes the surface property and increases the affinity between the adsorbent and organic dyes. The comparatively high dye adsorption capability and good regeneration shows promising application of PHFe(III)/KC in industrial waste water treatment.

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“…Basically, kaolin is mainly composed of kaolinite minerals with the chemical formula Al consists of two-layered of silicate (SiO Although theoretically, kaolin has no net surface charge, in the natural condition, it has a slight negative charge due to the defect on the edge of the crystalline structure papers have been reported that the kaolin or kaolinite minerals had been widely us purposed such as fabrication of rubber, paper, plastic, cosmetics, coating, paints, and ceramics, the catalyst for the diverse chemical reaction, and adsorbent. These broad applications of kaolin are owing to its nifty nature, such as high c thermal stability [17,18].…”

Section: Introductionmentioning

confidence: 99%

TiO2/Kaolin composite as low-cost adsorbent for procion red removal from aqueous solution: kinetics, equilibrium, and thermodynamic studies

Taher¹,

Wulandari²,

Mohadi³

et al. 2019

Bull. Chem. Soc. Eth.

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Procion red is one of the most utilized textile dyes by numerous textile factories worldwide. Unfortunately, it has a detrimental effect on the ecosystem whenever it was released into the environment as textile wastewater. In this work, the removal of procion red from aqueous solution has been conducted by adsorption with modified natural kaolin as a low-cost adsorbent. Kaolin was systematically modified by thermal activation then followed by acid activation in different acid concentration. Activated kaolin sample was then mixed with TiO2 to produce TiO2/Kaolin composite. Activated kaolin and TiO2/Kaolin composite were characterized using X-ray diffraction (XRD) and Fourier transform infrared (FT-IR). Various operational variables that affect the adsorption process were taken into consideration, including the effect of initial pH, contact time, initial dye concentration, and temperature. The adsorption parameters of kinetics, isotherm, and thermodynamics were also studied according to the most common model established. The results showed that the procion red adsorption was pH-dependent and reached equilibrium at 90 min. The kinetics study was revealed that the adsorption process was better demonstrated by the pseudo-first-order rather than the pseudo-second-order model. The adsorption isotherm investigation showed that the adsorption process was followed both Langmuir and Freundlich model with qe reached 158 mg/g, and the adsorption process was predicted in favorable condition. The thermodynamic study revealed that the adsorption process is spontaneous with endothermic nature. According to the results, it can be considered that the TiO2/Kaolin composite adsorbent has better adsorption capability to the procion red.

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Magnetic modification of acid-activated kaolin: Synthesis, characterization, and adsorptive properties

Cited by 47 publications

References 36 publications

α-Fe2O3 Nanoparticles/Vermiculite Clay Material: Structural, Optical and Photocatalytic Properties

α-Fe2O3 Nanoparticles/Vermiculite Clay Material: Structural, Optical and Photocatalytic Properties

Environmentally Friendly Treatment of Coal‐Bearing Kaolin by Polyhydroxy‐Iron for Anionic Dye Removal

TiO2/Kaolin composite as low-cost adsorbent for procion red removal from aqueous solution: kinetics, equilibrium, and thermodynamic studies

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