Adsorption of phenol from aqueous solution by four types of modified attapulgites

Guo, Xiao; He, Chaohui; Sun, Xiao; Liang, Xia; Chen, Xi; Liu, X. Y.

doi:10.1007/s13762-018-1699-6

Cited by 13 publications

(9 citation statements)

References 34 publications

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“…As supporting materials, bentonite has good adsorbability and hence can absorb a number of nZVI to load on its own surface. In addition, bentonite also has suspension and dispersion 27 , which can boost nZVI particles dispersion and reduce agglomeration, these properties simultaneously make the newly prepared composite nZVI have good adsorption properties. According to these characteristics, bentonite can be used as a supporting material to load nZVI to improve the ability of nZVI to remove pollutants.…”

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confidence: 99%

Study on influencing factors and mechanism of removal of Cr(VI) from soil suspended liquid by bentonite-supported nanoscale zero-valent iron

Liu

Gao

Cheng

et al. 2020

Sci Rep

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In order to clarify the mechanism and effect of bentonite-supported nanoscale zero-valent iron (nZVI@Bent) on Cr(VI) removal in soil suspended liquid, nZVI@Bent was prepared by liquid-phase reduction method in this research. A number of factors, including the mass ratio of Fe 2+ to bentonite during preparation of nZVI@Bent, nZVI@Bent dosage, soil suspended liquid pH value and reaction temperature were assessed to determine their impact on the reduction of Cr(VI) in soil suspended liquid. The nZVI@Bent was characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) to analyze the mechanism of removal of Cr(VI) from the soil. The results showed that the temperature of soil suspended liquid had a significant effect on the removal efficiency. Calculated by the Arrhenius formula, nZVI@Bent removes Cr(VI) from the soil suspended liquid as an endothermic reaction with a reaction activation energy of 47.02 kJ/mol, showed that the reaction occurred easily. The removal of mechanism Cr(VI) from the soil by nZVI@Bent included adsorption and reduction, moreover, the reduction process can be divided into direct reduction and indirect reduction. According to XPS spectrogram analysis, the content of Cr(III) in the reaction product was 2.1 times of Cr(VI), indicated that the reduction effect was greater than the adsorption effect in the process of Cr(VI) removal. The experiment proved that nZVI@Bent can effectively remove Cr(VI) from soil suspension, and can provide technical support for repairing Cr(VI)-polluted paddy fields. Chromium (Cr) is a heavy metal element that exists on the earth, mostly in the two valence states of Cr(III) and Cr(VI). Under certain conditions, Cr(VI) will be reduced to Cr(III) by reducing substances in the soil. Different environmental pollution effects of chromium in different valence states. Cr(VI) can be inhaled with dust to cause respiratory diseases. Oral administration can also cause digestive tract corrosion. After long-term exposure to the high concentration of Cr(VI), gene expression may be changed by destroying DNA, protein and lipid, which can cause cancer in severe cases 1,2. However, the toxicity of Cr(III) is much lower than that of Cr(VI), moreover, Cr(III) was an essential trace element in biological activities, and low concentration of Cr(III) was beneficial to organisms 3-6. Compared with Cr(VI), Cr(III) is more stable in the environment and difficult to migrate. Many industries containing chromium pollution such as metallurgy, tannery and electroplating and so on had sprung up in recent years. The discharge of wastewater in these industries lead to increasing the concentration of chromium in the cultivated soil environment, meanwhile, the land near factories was also polluted by a large accumulation of chromium slag and chromium dust 7-9. It is almost impossible to remove Cr from the soil, so it is the

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confidence: 99%

Study on influencing factors and mechanism of removal of Cr(VI) from soil suspended liquid by bentonite-supported nanoscale zero-valent iron

Liu

Gao

Cheng

et al. 2020

Sci Rep

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“…Meanwhile, a comparison between ATP and AATP shows that the intensity of the peak gradually decreases at 1196 cm –1 , which proves that HCl breaks part of the Si–O bond and activates the ATP surface. Because carbonate impurities were greatly reduced following acid treatment, AATP lost its absorption peak at 1450 cm –1 , which is the vibrational absorption peak of carbonate. , The FTIR spectrum of OATP reveals that the compound generated additional absorption peaks at 1489, 1558, and 2923 cm –1 . The absorption peaks produced at 2923 and 1489 cm –1 are the bending and stretching vibrational peaks of the C–H bond on the KH-550 carbon chain, which indicates the grafting of organic groups on the surface of ATP; the absorption peak at 1558 cm –1 is from the bending vibrational peak of −NH 2 .…”

Section: Resultsmentioning

confidence: 99%

Preparation of an Attapulgite-Modified Composite Hydrogel and Application in an Environmentally Responsive Green Fertilizer

Wu,

Yang,

Hou

et al. 2023

ACS Appl. Polym. Mater.

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“…The mechanisms of TA adsorption onto ATP/CoFe 2 O 4 may be mainly attributed to intermolecular hydrogen bond formation and surface complexation [34,35], as shown in the FTIR spectra of ATP/CoFe 2 O 4 before and after TA adsorption (Figure 11). The adsorption mechanisms of TA by ATP and CoFe 2 O 4 are as follows.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Attapulgite/CoFe2O4 Magnetic Composites for Efficient Adsorption of Tannic Acid from Aqueous Solution

Liu

Yao

Song

et al. 2019

IJERPH

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The use of attapulgite (ATP)-based materials for adsorption of pollutants from water and wastewater has received growing attention. However, recovering ATP-based adsorbents remains a challenge. In this study, a magnetic adsorbent ATP/CoFe2O4 with high tannic acid (TA) adsorptive capacity was fabricated via a facile co-precipitation approach and was well characterized. The loaded CoFe2O4 particles were embedded into the adsorbent surfaces to allow magnetic separability. For this material, its TA adsorption kinetics, isotherm behavior, and magnetic separation efficiency are reported. The developed magnetic composites had rapid sorption kinetics of 3 h, high sorption capacity of 109.36 mg/g, and good magnetic separation efficiency of 80%. The used ATP/CoFe2O4 was successfully regenerated by NaOH and reused five times without a substantial reduction in TA removal and magnetic performance. Intermolecular hydrogen bonding formation and surface complexation were identified as the sorption mechanisms of TA by ATP/CoFe2O4.

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Adsorption of phenol from aqueous solution by four types of modified attapulgites

Cited by 13 publications

References 34 publications

Study on influencing factors and mechanism of removal of Cr(VI) from soil suspended liquid by bentonite-supported nanoscale zero-valent iron

Study on influencing factors and mechanism of removal of Cr(VI) from soil suspended liquid by bentonite-supported nanoscale zero-valent iron

Preparation of an Attapulgite-Modified Composite Hydrogel and Application in an Environmentally Responsive Green Fertilizer

Preparation of Attapulgite/CoFe2O4 Magnetic Composites for Efficient Adsorption of Tannic Acid from Aqueous Solution

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