Enhanced adsorption performance of CuO‐Al<sub>2</sub>O<sub>3</sub> composite derived from cotton template

Duan, Ningjing; Li, Qiurong; Liu, Jie; Xiao, Haiyan

doi:10.1002/cjce.22288

Cited by 17 publications

(9 citation statements)

References 48 publications

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“…The adsorbed amount and the removal rate of sulfonated lignite remained at a high level (485 mg/g and 97% or more) at a lower pH. We attribute this to the protonation of Mg-Al metal oxides at neutral or acidic pH, and thus the formation of positively charged M-OH 2 + [ 25 ], which in turn causes electrostatic attraction between the positively charged metal oxide surface and the negatively charged adsorbent molecule [ 26 ]. In contrast, in the alkaline range (pH = 9, 11), sulfonated lignite adsorption decreases with higher pH.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Mg-Al Hydrotalcite Clay with High Adsorption Capacity

Zhang

et al. 2021

Materials

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A novel Mg-Al metal oxide has been successfully synthesized by the calcination of hierarchical porous Mg-Al hydrotalcite clay obtained by using filter paper as a template under hydrothermal conditions. Various characterizations of the obtained nanoscale oxide particles verified the uniform dispersion of Mg-Al metal oxides on the filter paper fiber, which had a size of 2–20 nm and a highest specific surface area (SSA) of 178.84 m2/g. Structural characterization revealed that the as-prepared Mg-Al metal oxides preserved the tubular morphology of the filter paper fibers. Further experiments showed that the as-synthesized Mg-Al metal oxides, present at concentrations of 0.3 g/L, could efficiently remove sulfonated lignite from oilfield wastewater (initial concentration of 200 mg/L) in a neutral environment (pH = 7) at a temperature of 298 K. An investigation of the reaction kinetics found that the adsorption process of sulfonated lignite (SL) on biomorphic Mg-Al metal oxides fits a Langmuir adsorption model and pseudo-second-order rate equation. Thermodynamic calculations propose that the adsorption of sulfonated lignite was spontaneous, endothermic, and a thermodynamically feasible process.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Mg-Al Hydrotalcite Clay with High Adsorption Capacity

Zhang

et al. 2021

Materials

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“…Also, it can be perceived that the composite oxide is assembled from nearly uniform particles exhibiting similar shape, and significant porosity, and no big blocks are observed [57]. In such catalysts, CuO dispersed on the surface of the flake-like γ-Al 2 O 3 generate synergy and coupling effects for ammonia adsorption [58].…”

Section: Surface Characterizationmentioning

confidence: 99%

Electro-Oxidation of Ammonia over Copper Oxide Impregnated γ-Al2O3 Nanocatalysts

et al. 2021

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Ammonia electro-oxidation (AEO) is a zero carbon-emitting sustainable means for the generation of hydrogen fuel, but its commercialization is deterred due to sluggish reaction kinetics and the poisoning of expensive metal electrocatalysts. With this perspective, CuO impregnated γ-Al2O3 (CuO/γ-Al2O3) hybrid materials were synthesized as effective and affordable electrocatalysts and investigated for AEO in alkaline media. Structural investigations were performed via different characterization techniques, i.e., X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical impedance spectroscopy (EIS). The morphology of γ-Al2O3 support as interconnected porous structures rendered the CuO/γ-Al2O3 nanocatalysts with robust activity. The additional CuO impregnation resulted in the enhanced electrochemical active surface area (ECSAs) and diffusion coefficient and spiked the electrocatalytic performance for NH3 electrolysis. Owing to good values of diffusion coefficient for AEO, low bandgap, and availability of ample ECSA at higher CuO to γ-Al2O3 ratio, these proposed electrocatalysts were proved to be effective in AEO. Due to good reproducibility, electrochemical stability, and higher activity for ammonia electro-oxidation, CuO/γ-Al2O3 nanomaterials are proposed as efficient promoters, electrode materials, or catalysts in ammonia electrocatalysis.

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“…A very strong advantage of cotton is its high stability in aqueous solutions . Many scholars prepared adsorbents derived from cotton as a biotemplate and obtained excellent research results. , For example, Duan et al fabricated biomorphic CuO–Al 2 O 3 nanomaterials using cotton as a template; the materials not only retained the tubular morphology but also possessed excellent adsorption capacity toward methyl blue (equal to 97.04 mg g –1 ), which was higher than CuO–Al 2 O 3 obtained without the usage of a cotton template . Li et al fabricated MoS 2 /CoAl-LDH hybrids using kapok as a biotemplate, and upon comparing the equilibrium absorption capacity toward CR between the hybrids synthesized with and without the biotemplate, they found that the capacity of the former was much higher than that of the latter (the difference value was 145 mg g –1 ) …”

Section: Introductionmentioning

confidence: 99%

Biotemplated Fabrication of 3D Hierarchically Porous MgAl-LDH/CF Composites with Effective Adsorption of Organic Dyes from Wastewater

Sun

Chen

2020

Ind. Eng. Chem. Res.

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The serious pollution of water resources has brought great challenges to human existence; it is urgent to develop adsorbents for removing toxic dyes from wastewater. In this work, we synthesized hierarchically porous MgAl-layered double hydroxide (LDH)/carbon fiber (CF) composites with excellent adsorption of Congo red (CR) by combining the biotemplating and hydrothermal method. The effects of various Mg/Al molar ratios on the X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Brunauer− Emmett−Teller (BET), and Fourier transform infrared (FT-IR) spectroscopy characterizations and the dye adsorption capacity of composites were investigated. Three-dimensionally stackable MgAl-LDH nanosheets with a Mg/Al molar ratio of 4 were attached uniformly on the surface of hollow carbon fibers calcined from cotton, generating higher crystallization and specific area. The maximum adsorption capacity of Mg 4 Al-LDH/CF was equal to 271.00 mg g −1 (linear Langmuir model, at 200 mg g −1 CR in 72 h), which was significantly higher than the adsorption capacity of MgAl-LDH synthesized without the use of a biotemplate (linear Langmuir model, 170.35 mg g −1 at 200 mg g −1 CR in 72 h). The adsorption reaction followed the linear pseudo-second-order kinetics as well as the linear Langmuir model. Anion exchange and electrostatic attraction were considered as the main adsorption mechanisms. Mg 4 Al-LDH/CF still maintained 85.33% of the maximum adsorption capacity after four adsorption−desorption cycles. The adsorbent synthesized by flexible and simple methods might be a competitive candidate to purify nondegradable substances from wastewater.

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Enhanced adsorption performance of CuO‐Al₂O₃ composite derived from cotton template

Cited by 17 publications

References 48 publications

Synthesis of Mg-Al Hydrotalcite Clay with High Adsorption Capacity

Synthesis of Mg-Al Hydrotalcite Clay with High Adsorption Capacity

Electro-Oxidation of Ammonia over Copper Oxide Impregnated γ-Al2O3 Nanocatalysts

Biotemplated Fabrication of 3D Hierarchically Porous MgAl-LDH/CF Composites with Effective Adsorption of Organic Dyes from Wastewater

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Enhanced adsorption performance of CuO‐Al2O3 composite derived from cotton template

Cited by 17 publications

References 48 publications

Synthesis of Mg-Al Hydrotalcite Clay with High Adsorption Capacity

Synthesis of Mg-Al Hydrotalcite Clay with High Adsorption Capacity

Electro-Oxidation of Ammonia over Copper Oxide Impregnated γ-Al2O3 Nanocatalysts

Biotemplated Fabrication of 3D Hierarchically Porous MgAl-LDH/CF Composites with Effective Adsorption of Organic Dyes from Wastewater

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Enhanced adsorption performance of CuO‐Al₂O₃ composite derived from cotton template