Water desalination using graphene oxide-embedded paper microfluidics

Ige, Ebenezer Olubunmi; Arun, Ravi Kumar; Singh, Preeti; Gope, Manash; Saha, Rajnarayan; Chanda, Nripen; Chakraborty, Suman

doi:10.1007/s10404-019-2247-5

Cited by 10 publications

(9 citation statements)

References 31 publications

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“…The in situ change of GO to rGO is confirmed by Raman spectroscopy studies, which is widely used to characterize the structural disorder, and defects in chemically synthesized graphene-based materials. It is reported that the I D / I G ratio increases from graphite to graphene oxide (GO) and again decreases after conversion of GO to rGO Figure S2 demonstrates the intensity of the D band at ∼1356 cm –1 corresponding to the disorder in the sp 2 carbon network decreases in Fe–Cu–rGO.…”

Section: Resultsmentioning

confidence: 99%

“…It is reported that the I D /I G ratio increases from graphite to graphene oxide (GO) and again decreases after conversion of GO to rGO. 48 Figure S2 demonstrates the intensity of the D band at ∼1356 cm −1 corresponding to the disorder in the sp 2 carbon network decreases in Fe−Cu−rGO. On the other hand, the G band at ∼1575 cm −1 for the tangential vibrations of the sp 2 carbon atoms in the hexagonal planes increases in comparison to the GO.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Facile Detection of Blood Creatinine Using Binary Copper–Iron Oxide and rGO-Based Nanocomposite on 3D Printed Ag-Electrode under POC Settings

Singh

Mandal

Roy

et al. 2021

ACS Biomater. Sci. Eng.

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Metal nanoparticles have been helpful in creatinine sensing technology under point-of-care (POC) settings because of their excellent electrocatalyst properties. However, the behavior of monometallic nanoparticles as electrochemical creatinine sensors showed limitations concerning the current density in the mA/cm2 range and wide detection window, which are essential parameters for the development of a sensor for POC applications. Herein, we report a new sensor, a reduced graphene oxide stabilized binary copper–iron oxide-based nanocomposite on a 3D printed Ag-electrode (Fe–Cu–rGO@Ag) for detecting a wide range of blood creatinine (0.01 to 1000 μM; detection limit 10 nM) in an electrochemical chip with a current density ranging between 0.185 and 1.371 mA/cm2 and sensitivity limit of 1.1 μA μM–1 cm–2 at physiological pH. Interference studies confirmed that the sensor exhibited no interference from analytes like uric acid, urea, dopamine, and glutathione. The sensor response was also evaluated to detect creatinine in human blood samples with high accuracy in less than a minute. The sensing mechanism suggested that the synergistic effects of Cu and iron oxide nanoparticles played an essential role in the efficient sensing where Fe atoms act as active sites for creatinine oxidation through the secondary amine nitrogen, and Cu nanoparticles acted as an excellent electron-transfer mediator through rGO. The rapid sensor fabrication procedure, mA/cm2 peak current density, a wide range of detection limits, low contact resistance including high selectivity, excellent linear response (R 2 = 0.991), and reusability ensured the application of advanced electrochemical sensor toward the POC creatinine detection.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Facile Detection of Blood Creatinine Using Binary Copper–Iron Oxide and rGO-Based Nanocomposite on 3D Printed Ag-Electrode under POC Settings

Singh

Mandal

Roy

et al. 2021

ACS Biomater. Sci. Eng.

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“…Inspired by biological nanochannels, synthetic nanochannels have attracted increasing interest due to their unique transmission behaviors and promising prospects in various fields, such as biomedicine [ 1 , 2 , 3 ], nanofiltration [ 4 , 5 ], water desalination [ 6 , 7 , 8 , 9 ], and energy storage [ 10 , 11 , 12 ]. The hydration interactions, van der Waal interactions, and electrostatic interactions are the main factors that confine the transition behaviors of aqueous solutions down to nanoscale [ 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Atomistic Simulations of the Permeability and Dynamic Transportation Characteristics of Diamond Nanochannels

Dong

Shi

et al. 2022

Nanomaterials

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Through atomistic simulations, this work investigated the permeability of hexagonal diamond nanochannels for NaCl solution. Compared with the multilayer graphene nanochannel (with a nominal channel height of 6.8 Å), the diamond nanochannel exhibited better permeability. The whole transportation process can be divided into three stages: the diffusion stage, the transition stage and the flow stage. Increasing the channel height reduced the transition nominal pressure that distinguishes the diffusion and flow stages, and improved water permeability (with increased water flux but reduced ion retention rate). In comparison, channel length and solution concentration exerted ignorable influence on water permeability of the channel. Further simulations revealed that temperature between 300 and 350 K remarkably increased water permeability, accompanied by continuously decreasing transition nominal pressure. Additional investigations showed that the permeability of the nanochannel could be effectively tailored by surface functionalization. This work provides a comprehensive atomic insight into the transportation process of NaCl solution in a diamond nanochannel, and the established understanding could be beneficial for the design of advanced nanofluidic devices.

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“…The research in this field focuses on developing new technologies or the improvement of existing ones. Directional solvent extraction [ 35 ] or absorption into a graphene oxide-embedded paper matrix [ 36 ] are examples of new desalination processes. Integrating IEMs into capacitive deionization units is an example of improving the existing technologies.…”

Section: Introductionmentioning

confidence: 99%

Semi-Continuous Desalination and Concentration of Small-Volume Samples

Tichý

Slouka

2021

IJMS

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Electrodialysis is an electric-field-mediated process separating ions exploiting selective properties of ion-exchange membranes. The ion-exchange membranes create an ion-depleted zone in an electrolyte solution adjacent to the membrane under DC polarization. We constructed a microfluidic system that uses the ion-depleted zone to separate ions from the processed water solution. We tested the separation performance by desalting a model KCl solution spiked with fluorescein for direct observation. We showed both visually and by measuring the conductivity of the output solutions that the system can work in three modes of operation referred to as continuous desalination, desalination by accumulation, and unsuccessful desalination. The mode of operation can easily be set by changing the control parameters. The desalination factors for the model KCl solution reached values from 80 to 100%, depending on the mode of operation. The concentration factor, given as a ratio of concentrate-to-feed concentrations, reached zero for desalination by accumulation when only diluate was produced. The water recovery, therefore, was infinite at these conditions. Independent control of the diluate and concentrate flow rates and the DC voltage turned our system into a versatile platform, enabling us to set proper conditions to process various samples.

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Water desalination using graphene oxide-embedded paper microfluidics

Cited by 10 publications

References 31 publications

Facile Detection of Blood Creatinine Using Binary Copper–Iron Oxide and rGO-Based Nanocomposite on 3D Printed Ag-Electrode under POC Settings

Facile Detection of Blood Creatinine Using Binary Copper–Iron Oxide and rGO-Based Nanocomposite on 3D Printed Ag-Electrode under POC Settings

Atomistic Simulations of the Permeability and Dynamic Transportation Characteristics of Diamond Nanochannels

Semi-Continuous Desalination and Concentration of Small-Volume Samples

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