Covalent Functionalization of Graphene for the Enhancement of Thermophysical Properties in Nanofluids

Selvaraj, Vishnuprasad; Kumar, K. Senthil; Haribabu, K.

doi:10.1002/ceat.202000477

Cited by 7 publications

(7 citation statements)

References 32 publications

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“…40 Furthermore, the electrolyte concentrations in the phosphate buffer were optimized to ensure the most suitable ratio for the experiment. 41 For EIS, we employed a frequency response analyzer to measure the system's impedance across a range of frequencies, specifically from 100 kHz to 10 MHz.…”

Section: Synthesis Of Catalystsmentioning

confidence: 99%

Laser-Induced Graphene as a Cathode Catalyst for Microbial Fuel Cell

Senthilkumar,

Wanjari,

Kanwar

et al. 2024

ACS Appl. Nano Mater.

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Cathode catalysts are vital components in microbial fuel cells (MFCs) for power generation. However, the high cost of platinum (Pt), the preferred catalyst material, limits its scalability. Several efforts have been made to improve the catalytic performance of MFCs in order to replace the existing catalysts. Graphene exhibits excellent catalytic activity due to its unique physicochemical properties. However, conventional graphene fabrication methods are complex and expensive. In contrast, laser-induced graphene (LIG) offers a single-step, cost-effective approach with high conductivity and catalytic activity. This study investigates the performance of LIG derived from poly(ether sulfone) (PES)-modified carbon cloth (CC) as a cathode catalyst for wastewater treatment in MFCs. X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and Raman spectroscopy were used to characterize the prepared catalyst, demonstrating its unique nature and purity. Additionally, cyclic voltammetry (CV) and electron impedance spectroscopy (EIS) analysis evaluate the PES-LIG-CC's charge-transfer capacity and electrocatalytic activity. MFC with PES-LIG-CC has given a potential value (0.740 V) that was 2.1 times higher than bare CC (0.360 V) but lesser than Pt/C catalyst (1.050 V). The PES-LIG-CC cathode achieves a maximum chemical oxygen demand (COD) removal of 84% after three cycles. The finding suggests that the PES-LIG-CC catalyst for power output offers an affordable substitute for the expensive Pt/C catalysts used in MFC for wastewater treatment.

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Section: Synthesis Of Catalystsmentioning

confidence: 99%

Laser-Induced Graphene as a Cathode Catalyst for Microbial Fuel Cell

Senthilkumar,

Wanjari,

Kanwar

et al. 2024

ACS Appl. Nano Mater.

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“…Acidic functionalization has great promise for GO nanoparticles since it enhances the nanofluid's dispersion stability and thermal conductivity. 19 Irani et al 20 reported amine-functionalized GO and methyldiethylamine nanofluid for improving the CO 2 and H 2 S adsorption efficiencies of amine solution. They reported a high adsorption capacity of 16.2 and 17.7% of CO 2 and H 2 S, respectively.…”

Section: ■ Introductionmentioning

confidence: 99%

“…There are several methods for the chemical functionalization of GO, but the most common is a combination of acids and alkalis. Acidic functionalization has great promise for GO nanoparticles since it enhances the nanofluid’s dispersion stability and thermal conductivity . Irani et al reported amine-functionalized GO and methyldiethylamine nanofluid for improving the CO 2 and H 2 S adsorption efficiencies of amine solution.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Thermophysical Properties and Thermal Performance of Amine-Functionalized Graphene Oxide/Deep Eutectic Solvent Nanofluids as Heat-Transfer Media for Desalination Systems

Das

Santra

Naik

et al. 2023

ACS Sustainable Chem. Eng.

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The study mainly focuses on the synthesis and characterization of amine-functionalized graphene oxide (GO-NH 2 ) nanoparticles. It also reports the thermal properties and stability analysis of deep eutectic solvent (DES)-and GO-NH 2 -based nanofluids. DES is composed of diphenyl ether as the hydrogen bond acceptor and DL-menthol as the hydrogen bond donor in the molar ratio 1:1. The nanofluid was prepared by a two-step method where two different concentrations of functionalized graphene nanofluids, namely, 0.0033 volume fraction (NF1) and 0.0101 volume fraction (NF2), were reported. XRD and FTIR analyses were used to validate the nanoparticle's identity. Additionally, the morphology and composition of GO-NH 2 nanoparticles were investigated using FESEM, FETEM, EDS, and Raman analyses. After that, the stability of the nanofluids was assessed using ζ potential measurements. The ζ potential measurements revealed increased stability, indicating that no agglomeration occurred in the DES-based nanofluid. Excellent thermal conductivity enhancement was observed at a higher temperature for the GO-NH 2 nanofluid. The density and viscosity of the base fluid and nanofluid decreased with an increase in temperature from 25 to 85 °C. Further, the specific heat capacity of the nanofluids also increased with the increase in temperature and volume fractions of the nanofluid. Thermogravimetric analysis was also performed to evaluate the thermal degradation of the nanofluid under a nitrogen atmosphere. The nanofluid was used in brine recirculation multistage flash desalination where the gained output ratio of less than 10 was obtained through ASPEN simulation.

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“…Many of these varieties of nanoparticles were integrated into fluids which include water and oil in ethylene glycol. Gold (Au), silver (Ag), and other nanoparticles were investigated due to their superior chemical, electrical, and optical properties in nanoscale 25–34. Eastman et al 35 found that copper oxide nanoparticles will give up to 65 % improvement in thermal conductivity of nanofluids for several industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Water Desalination Using Solar Thermal Collectors Enhanced by Nanofluids

et al. 2021

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The absorption efficiency of a solar collector using different types of nanofluids was improved. Experimental work was carried out to investigate the flat‐plate and evacuated‐tube collectors under outdoor conditions to produce distilled water. A pilot plant was designed and installed. The yield of distilled water at different seawater flow rates and the physical properties of nanofluids were determined. Solar intensity, water mass flow rate, and temperature were measured. The performance of the desalination unit was evaluated in the presence of carbon nanotubes in paraffin wax and ethylene glycol nanofluids. The evaporation efficiency of the flat‐plate collector was improved up to 36 % in the presence of ethylene glycol nanofluid at 80–100 °C.

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Covalent Functionalization of Graphene for the Enhancement of Thermophysical Properties in Nanofluids

Cited by 7 publications

References 32 publications

Laser-Induced Graphene as a Cathode Catalyst for Microbial Fuel Cell

Laser-Induced Graphene as a Cathode Catalyst for Microbial Fuel Cell

Evaluation of Thermophysical Properties and Thermal Performance of Amine-Functionalized Graphene Oxide/Deep Eutectic Solvent Nanofluids as Heat-Transfer Media for Desalination Systems

Water Desalination Using Solar Thermal Collectors Enhanced by Nanofluids

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