Removal of pollutants via synergy of adsorption and photocatalysis over MXene-based nanocomposites

Zhang, Li; Ma, Pingping; Dai, Li; Bu, Zhen; Li, Xueying; Yu, Wei; Cao, Yiran; Guan, Jie

doi:10.1016/j.ceja.2022.100285

Cited by 28 publications

(4 citation statements)

References 66 publications

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“…The inset Figure 3f shows the Barrett-Joyner-Halenda (BJH) pore size and pore volume distribution of the Pd-MXene nanocatalysts. The Pd-MXene nanocatalysts exhibited pore sizes and total pore volumes between 8-20 nm, and 0.289 cm 3 g −1 , respectively, suggesting a superiority over the various MXene-based nanocomposites [25,26]. The higher SSA and pore channels in Pd-MXene nanocatalysts could enhance their electrocatalytic activities, which could improve CO2 adsorption and electro redox behavior for reducing CO2 into fuels.…”

Section: Co 2 Rr Performancementioning

confidence: 98%

Pd-Decorated 2D MXene (2D Ti3C2Tix) as a High-Performance Electrocatalyst for Reduction of Carbon Dioxide into Fuels toward Climate Change Mitigation

Govindan

Madhu²,

Haija³

et al. 2022

Catalysts

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Palladium nanoparticles (Pd NPs) have attracted considerable attention recently for their excellent catalytic properties in various catalysis reactions. However, Pd NPs have some drawbacks, including their high cost, susceptibility to deactivation, and the possibility of poisoning by intermediate products. Herein, Pd nanoparticles with an average diameter of 6.5 nm were successfully incorporated on electronically transparent 2D MXene (Ti3C2Tix) nanosheets (Pd-MXene) by microwave irradiation. Considering the synergetic effects of ultra-fine Pd NPs, together with the intrinsic properties of 2D MXene, the obtained Pd-MXene showed a specific surface area of 97.5 m2g−1 and multiple pore channels that enabled excellent electrocatalytic activity for the reduction of CO2. Further, the 2D Pd-MXene hybrid nanocatalyst enables selective electroreduction of CO2 into selective production of CH3OH in ambient conditions by multiple electron transfer. A detailed explanation of the CO2RR mechanism is presented, and the faradic efficiency (FE) of CH3OH is tuned by varying the cell potential. Recyclability studies were conducted to demonstrate the practical application of CO2 reduction into selective production of CH3OH. In this study, metal and MXene interfaces were created to achieve a highly selective electroreduction of CO2 into fuels and other value-added chemical products.

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Section: Co 2 Rr Performancementioning

confidence: 98%

Pd-Decorated 2D MXene (2D Ti3C2Tix) as a High-Performance Electrocatalyst for Reduction of Carbon Dioxide into Fuels toward Climate Change Mitigation

Govindan

Madhu²,

Haija³

et al. 2022

Catalysts

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“…There is a growing effort to explore novel materials, enhance the efficacy of current biosorbents, and develop hybrid technologies that target multicomponent biosorption, incorporating methods such as electrocoagulation [88], ozonation [89], and photocatalysis [90] as a second phase for degrading the pollutants. Research efforts are also underway to explore the potential of hybrid biosorbents derived from a variety of agricultural waste materials.…”

Section: Future Approach and Practical Applicationsmentioning

confidence: 99%

Statistical Modelling of Biosorptive Removal of Hexavalent Chromium Using Dry Raw Biomasses of Dioscorea rotundata, Elaeis guineensis, Manihot esculenta, Theobroma cacao and Zea mays

2023

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Hexavalent chromium [Cr (VI)] is a highly toxic and hazardous contaminant that poses serious health risks to both humans and the environment. Its presence in water sources can lead to severe health issues, including various types of cancer and respiratory ailments. Therefore, developing efficient and effective methods for Cr (VI) removal is crucial in ensuring safe and clean water supplies. The aim of this research is the environmentally responsible elimination of hexavalent chromium by bioadsorption using corn residues (CR), palm fiber (PF), and the peels of yam (YP), cassava (CP), and cocoa (CH). The study was conducted with varying levels of pH, bioadsorbent quantity, temperature, and adsorbent particle size at 200 rpm, with an initial concentration of 100 mg/L and 24 h of contact time to improve the adsorption efficiency. The process variables were evaluated and optimized using the statistical technique response surface methodology (RSM). The SEM-EDS analysis revealed that the predominant elements in the structure of the bioadsorbents were carbon and oxygen. Furthermore, the adsorption process led to the incorporation of Cr (VI) into the structure of the biomaterials, as indicated by their EDS spectra. The maximal adsorption efficiency of 99.11% was obtained at pH 2, bioadsorbent dose of 0.03 mg, 30 °C, and 0.5 mm of particle size. Various equilibrium isotherms were utilized to fit and analyze the adsorption data. The assessed maximum adsorption capacities were 38.84, 56.88, 52.82, 138.94, and 240,948.7 mg/g for YP, PF, CP, CH, and CR, respectively. The adsorption data exhibited conformity with the Freundlich and Redlich–Peterson isotherm models (R2 = 0.95), indicating that the phenomenon occurs in a multilayer. Pseudo-second order and Elovich kinetic models adjusted the kinetics of chromium (VI), suggesting that the mechanism could be controlled by chemisorption. Therefore, the residual biomasses evaluated can serve as a cost-effective adsorbent for Cr (VI) removal, and the use of RSM enables efficient modeling and prediction of the adsorption process.

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“…The hybrid composites exhibited good degradation efficiency for pollutants in successive cycles [ 77 ]. In addition, MXene-based composites comprising multi-layered MXene (Ti 3 C 2 ) nanosheets and transition metal oxide nanomaterials, i.e., zinc oxide, bismuth molybdate and tin dioxide, were introduced for the catalytic removal of pollutants with high adsorption capacity towards methylene blue [ 78 ]. Accordingly, 150 mg L −1 of high concentration methylene blue solution and 20 mg L −1 of 4-chlorophenol solution were totally eliminated by adsorption and photocatalysis using these MXene-based photocatalysts for 4 h under visible light irradiation.…”

Section: Photocatalytic Degradation Of Organic and Pharmaceutical Pol...mentioning

confidence: 99%

“…Accordingly, 150 mg L −1 of high concentration methylene blue solution and 20 mg L −1 of 4-chlorophenol solution were totally eliminated by adsorption and photocatalysis using these MXene-based photocatalysts for 4 h under visible light irradiation. Studies on mechanisms revealed that hydroxyl and superoxide free radicals were reactive species in the degradation procedure; coupling transition metal oxide and MXene inhibited the recombination of photogenerated electron–hole pairs [ 78 ]. These MXene-based nanocomposites with synergistic removal of pollutants and strong adsorption thus offer themselves as promising photocatalysts for environmental pollution control.…”

Section: Photocatalytic Degradation Of Organic and Pharmaceutical Pol...mentioning

confidence: 99%

MXene-Based Photocatalysts in Degradation of Organic and Pharmaceutical Pollutants

Iravani

Varma

2022

Molecules

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These days, explorations have focused on designing two-dimensional (2D) nanomaterials with useful (photo)catalytic and environmental applications. Among them, MXene-based composites have garnered great attention owing to their unique optical, mechanical, thermal, chemical, and electronic properties. Various MXene-based photocatalysts have been inventively constructed for a variety of photocatalytic applications ranging from pollutant degradation to hydrogen evolution. They can be applied as co-catalysts in combination with assorted common photocatalysts such as metal sulfide, metal oxides, metal–organic frameworks, graphene, and graphitic carbon nitride to enhance the function of photocatalytic removal of organic/pharmaceutical pollutants, nitrogen fixation, photocatalytic hydrogen evolution, and carbon dioxide conversion, among others. High electrical conductivity, robust photothermal effects, large surface area, hydrophilicity, and abundant surface functional groups of MXenes render them as attractive candidates for photocatalytic removal of pollutants as well as improvement of photocatalytic performance of semiconductor catalysts. Herein, the most recent developments in photocatalytic degradation of organic and pharmaceutical pollutants using MXene-based composites are deliberated, with a focus on important challenges and future perspectives; techniques for fabrication of these photocatalysts are also covered.

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Removal of pollutants via synergy of adsorption and photocatalysis over MXene-based nanocomposites

Cited by 28 publications

References 66 publications

Pd-Decorated 2D MXene (2D Ti3C2Tix) as a High-Performance Electrocatalyst for Reduction of Carbon Dioxide into Fuels toward Climate Change Mitigation

Pd-Decorated 2D MXene (2D Ti3C2Tix) as a High-Performance Electrocatalyst for Reduction of Carbon Dioxide into Fuels toward Climate Change Mitigation

Statistical Modelling of Biosorptive Removal of Hexavalent Chromium Using Dry Raw Biomasses of Dioscorea rotundata, Elaeis guineensis, Manihot esculenta, Theobroma cacao and Zea mays

MXene-Based Photocatalysts in Degradation of Organic and Pharmaceutical Pollutants

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