Adsorptive Removal of Low-Concentration Cr(VI) in Aqueous Solution by Mg–Al Layered Double Oxides

Fan, Lin; Zhou, Bo; Zhang, Sheng; Hu, Shixue; Mi, Xiaohui; Sun, Ran; Wu, Yaoguo

doi:10.1007/s00128-020-03053-y

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…Both also have an the antisymmetric stretching vibration band of C O C in CO 3 2− at about 1354 cm −1 , whichtogether with the bending vibrations of surface CO 3 2− at about 800 and 670 cm −1form the characteristic bands of Mg-Al hydrotalcite. 19,20 A similar O H stretching band has also been observed in calcined Mg-Al oxides in previous reports, 21 which indicates that the use of a template causes no change to the surface composition of the catalyst, but only affects the morphology and pore structure properties.…”

Section: Structural Characterization Mg-al Oxidessupporting

confidence: 81%

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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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Section: Structural Characterization Mg-al Oxidessupporting

confidence: 81%

“…25 It can also that the characteristic absorption bands of the planar bending vibrations of CO 3 2− appeared at 800 and 670 cm −1 . 20 The increase in carbonate content might be associated with an increased amount of HCO 3− , which is strongly dependent on the Mg content. 26…”

Section: The Catalytic Activity Data Displayed Inmentioning

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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“…Excessive or long-term dichromate exposure can bring out chronic chromium poisoning, and cause severe damage to human health [10][11][12]. Hereby, the World Health Organization (WHO) have recommended the allowable limit contaminant level of dichromate in natural water as 0.05 mg/L [13,14]. In this sense, several methods such as chemical precipitation, reverse osmosis, ion exchanger, bio/physisorption [15], adsorption, electrodialysis etc.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Two Calix[4]arene-Functionalized Biopolymers and Evaluations of Their Extraction Abilities Against Cr(VI)/As(V) Anions

Sayın

2022

Türk Doğa Ve Fen Dergisi

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İki kaliksarene-fonksiyonlu biyopolimerler (kaliksaren-fonksiyonlu kitosan ve kaliksaren-fonksiyonlu selüloz) sentezlenmiş ve FTIR, TGA ve element analiz gibi teknikler kullanılarak uygun bir şekilde karakterize edilmişlerdir. Ayrıca, çeşitli pH lardaki anyon ekstraksiyon davranışları dikromat ve arsenat anyonlarına karşı incelenmiştir. Sonuçlar dikromat iyonuna karşı kaliksaren-fonksiyonlu kitosanın kaliksaren-fonksiyonlu selüloza göre daha büyük ekstraksiyon kabiliyetinin olduğunu gösterdi. İlginç bir şekilde, dikromat anyonuna karşı daha düşük bir ekstraksiyon verimliliği kaliksaren-fonksiyonlu selüloz ile elde edilmesine rağmen, arsenat anyon ektraksiyon sonuçları kaliksaren-fonksiyonlu selülozun kaliksaren-fonksiyonlu kitosana göre daha etkin iyonofor olduğunu gösterdi.

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Selective and efficient removal of phosphate from aqueous solution using activated carbon‐supported Mg–Fe layered double oxide nanocomposites

Bezza,

Brink,

Chirwa

2024

Can J Chem Eng

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In the face of the continuous development of novel adsorbents, developing robust adsorbents with high efficiency, strong phosphate selectivity, high regenerability, and cost effectiveness is a scientific challenge. In the present study, an activated carbon‐supported MgFe2O4‐layered double hydroxide (AC@ MgFe2O4‐LDH) derived Mg–Fe layered double oxide (AC@ MgFe2O4‐LDO) nanocomposite was synthesized at various temperatures and its potential application for phosphate adsorption was investigated. The nanocomposite exhibited a hierarchical mesoporous structure with a Brunauer–Emmett–Teller (BET) specific surface area of 193 m2/g and a narrow per‐size distribution of ~2 nm. AC@MgFe2O4‐LDO exhibited a high point of zero charge (pHpzc) value of 9.8 and robust phosphate adsorption potential over a wide pH range of 4–9 due to its high pH buffering capacity. The effects of adsorbent dose, layered double hydroxides (LDH) calcination temperature, initial phosphate concentration, contact time, and temperature on the phosphate adsorption capacity of the adsorbent were investigated. In the present study, up to 99.0% removal of phosphate was achieved at a 4 g/L adsorbent dosage in 4 h at pH 7 and 30°C. An adsorption kinetics study revealed that the adsorption of phosphate by AC@MgFe2O4‐LDO reached equilibrium within 240 min, with the kinetic experimental data fitting well with pseudo‐first‐order kinetics (r2 >0.99). The Langmuir adsorption isotherm model fit the experimental data well, with a maximum adsorption capacity of 25.81 mg/g. The adsorbent displayed strong phosphate selectivity in the presence of competing anions, and the study demonstrated that AC@MgFe2O4‐LDO has promising potential for efficient phosphate adsorption over a wide pH range.

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Adsorptive Removal of Low-Concentration Cr(VI) in Aqueous Solution by Mg–Al Layered Double Oxides

Cited by 10 publications

References 23 publications

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

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

Preparation of Two Calix[4]arene-Functionalized Biopolymers and Evaluations of Their Extraction Abilities Against Cr(VI)/As(V) Anions

Selective and efficient removal of phosphate from aqueous solution using activated carbon‐supported Mg–Fe layered double oxide nanocomposites

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