Synthesis of hierarchical MgO based on a cotton template and its adsorption properties for efficient treatment of oilfield wastewater

Tang, Ying; Li, Zhaoyi; Xu, Zhongying; Zhang, Jie; Qu, Chengtun; Zhang, Zhifang

doi:10.1039/d0ra04181e

Cited by 14 publications

(6 citation statements)

References 36 publications

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“…In this work, the value of R L was found to be 0.999, suggesting that the equilibrium parameter was less than 1 but near to 1, which means a favorable linear adsorption. is means that the equilibrium isotherms can be well described by the Langmuir model (Figure 19), and the adsorption process takes place as a monolayer (ML) on a surface with a finite number of identical sites, which are distributed homogeneously over the surface of the adsorbent [30]. e thermodynamic parameters of an adsorption process are necessary to decide whether the process is spontaneous or not.…”

Section: Adsorption Isotherms Studiesmentioning

confidence: 99%

Eco-Friendly Adsorbent from Waste of Mint: Application for the Removal of Hexavalent Chromium

Khammour

Abdoul-Latif

Ainane

et al. 2021

Journal of Chemistry

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A serious environmental disaster is looming on the horizon due to the indiscriminate release of heavy metals into the soil and wastewater from human industrial practices. In this study, waste mint (WM) was used to remove chromium(VI) from aqueous solution using batch experiments. The adsorbent material (WM) was characterized using scanning electron microscopy coupled with energy dispersive analysis of X-ray spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). The adsorption parameters optimized were as follows: pH solution (2–11), initial concentration of Cr(VI) (10–50 mg/L), adsorbent dose (0.1–10 g/L), and temperature conditions (298 K, 308 K, and 318 K). The experimental data fitted well to the fractional power kinetic model (0.97≤R2≤ 0.99) and Langmuir isotherm (R2 = 0.984) with a maximum adsorption capacity Qmax = 172.41 mg/g. The thermodynamic parameters for Cr(VI) sorption were also calculated, confirming that the adsorption process was spontaneous and accompanied by an exothermic adsorption (−4.83 ≤ ΔG ≤ −3.22 kJ/mol and ΔH = −28.93 kJ/mol). The Cr(VI) removal percentage was within the range of 41–98%, and the highest removal was noted at pH = 2. The results of the present study suggest that WM is a potential low-cost adsorbent for the removal of chromium(VI) from aqueous solutions.

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Section: Adsorption Isotherms Studiesmentioning

confidence: 99%

Eco-Friendly Adsorbent from Waste of Mint: Application for the Removal of Hexavalent Chromium

Khammour

Abdoul-Latif

Ainane

et al. 2021

Journal of Chemistry

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“…This was possibly due to agglomeration of the catalyst surface and loss of Mg 2+ species by sublimation or penetration into the subsurface. 18…”

Section: Effect Of Calcination Temperaturementioning

confidence: 99%

Highly active Mg–Al hydrotalcite for efficient O‐methylation of phenol with DMC based on soft colloidal templates

Tang

Slaný

Yang

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Anisole (AN) is an important compound that has been studied in research into antioxidants, plastic stabilizers, pesticides and dyes. One of the technological alternatives to synthesizing them is using a modified solid catalyst with a soft colloidal template. Synthesis of AN has been demonstrated using dimethyl carbonate (DMC) and phenol over a mixed oxide catalyst derived from Mg-Al hydrotalcite, employing cetyl trimethylammonium bromide (CTAB) as a soft colloidal template. RESULTS: When the reaction was performed at atmospheric pressure in the presence of catalyst (in an amount of 4.5 wt% with respect to the reactants, DMC and phenol) at 200 °C, and a DMC:phenol molar ratio of 2:1 for 8 h, good results were seen for both phenol conversion and selectivity of AN (87.66% and 99.38%, respectively). The yield of AN was 87.11%. CONCLUSION:The characterization of the catalyst demonstrated that the calcination temperature has a significant effect on the structure of the obtained Mg-Al hydrotalcite. Its surface properties and pore diameter distribution resulted in an increased concentration of hierarchical basic sites within the material. Weak and moderate basic sites contributed to the high conversion of phenol and good selectivity of AN. In addition, the thermal stability analysis of the as-prepared Mg-Al mixed oxide showed that the hierarchical structures can be preserved up to 500 °C and eventually be transformed into highly dispersed MgO particles.

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“…If they are not handled properly, human health could be harmed by the toxic substances in crude oil. Thus, effective treatment of crude oil and other pollutants from oilfield wastewater is a considerable challenge [ 3 , 4 ]. Generally, oil removal can be divided into physical, chemical and biological methods according to the principle of the treatment methods [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Crude Oil Sorption by Modified Plant Materials in Oilfield Wastewater Treatment

Shi

Ma²,

Hou³

et al. 2022

Molecules

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The treatment of oilfield wastewater with high crude oil content and complex composition is a problem requiring considerable attention. In order to effectively remove crude oil contained in wastewater, in this work, rice straw, as an oil-absorbing material, was modified and used as a sorbent for crude oil. Rice straw was modified with alkali and cetyltrimethylammonium chloride (CTAC) by simple substitution reaction. The adsorption capacity of modified rice straw for oil was evaluated. The results illustrate that the adsorption rate of rice straw for crude oil was increased from 0.83 to 8.49 g/g, with the optimal conditions of 18% NaOH reacted for 90 min at 50 °C and 2% CTAC reacted for 60 min at 20 °C. The proposed modification method could be used for different materials to enhance the adsorption rate. The results of the contact angle test show that the modified straw changed from hydrophilic to hydrophobic, which may be the main reason for the improvement in the oil absorption rate. Finally, the surface structure of rice straw was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and N2 adsorption–desorption isotherms, which further confirmed the hydrophobicity of the modified rice straw.

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Synthesis of hierarchical MgO based on a cotton template and its adsorption properties for efficient treatment of oilfield wastewater

Abstract: A biomorphic MgO nanomaterial was fabricated via a facile and low-cost immersion method using cotton as the template.

Cited by 14 publications

References 36 publications

Eco-Friendly Adsorbent from Waste of Mint: Application for the Removal of Hexavalent Chromium

Eco-Friendly Adsorbent from Waste of Mint: Application for the Removal of Hexavalent Chromium

Highly active Mg–Al hydrotalcite for efficient O‐methylation of phenol with DMC based on soft colloidal templates

Enhanced Crude Oil Sorption by Modified Plant Materials in Oilfield Wastewater Treatment

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