Improvement of water softening efficiency in capacitive deionization by ultra purification process of reduced graphene oxide

Tuan, Trinh Ngoc; Chung, Sang K.; Lee, Jae Kwang; Lee, Jae-Young

doi:10.1016/j.cap.2015.08.001

Cited by 32 publications

(13 citation statements)

References 11 publications

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“…Minerals 2021, 11, x FOR PEER REVIEW 3 of 17 reduction degree, are also assessed. Membranes morphological and micro-structural characterization is discussed in order to demonstrate their applicability as filters for metalpolluted wastewater and water softening [25,26]. Aqueous solutions with composition similar to real mining wastewater, containing Cu 2+ , Fe 3+ , Ni 2+ , and Mn 2+ , or close to drinkable water, containing Ca 2+ and Mg 2+ , have been used to prove the effectiveness of the proposed membranes.…”

Section: Methodsmentioning

confidence: 99%

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Reduced Graphene Oxide Membranes as Potential Self-Assembling Filter for Wastewater Treatment

et al. 2020

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This work focuses on the investigation of the capability of reduced graphene oxide (rGO) filters to remove metals from various wastewater. The process to produce rGO membranes is reported and discussed, as well as their ability to capture ions in complex solutions, such as tap or industrial wastewater. Multi-ion solutions, containing Cu2+, Fe3+, Ni2+, and Mn2+ to simulate mine wastewater, or Ca2+ and Mg2+ to mimic drinkable water, were used as models. In mono-ionic solutions, the best capture efficiency values were proved for Ca2+, Fe3+, and Ni2+ ions, while a matrix effect was found for multi-ion solutions. However, interesting capture efficiencies were measured in the range of 30–90%, depending on the specific ion, for both single and multi-ion solutions. An attempt is proposed to correlate ions capture efficiency with ions characteristics, such as ionic radius or charge. Combining a satisfactory capture efficiency with low costs and ease of treatment unit operations, the approach here proposed is considered promising to replace other more complex and expensive filtration techniques.

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Section: Methodsmentioning

confidence: 99%

“…Parameters optimization to obtain the membranes via vacuum filtration, as well as to achieve a proper reduction degree, are also assessed. Membranes morphological and micro-structural characterization is discussed in order to demonstrate their applicability as filters for metalpolluted wastewater and water softening [25,26].…”

Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide Membranes as Potential Self-Assembling Filter for Wastewater Treatment

et al. 2020

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“…Capacitive deionization (CDI), on the other hand, is a promising technology that uses electrophoretic driving forces to remove charged ions from an aqueous solution (Pekala et al, 1998). It was shown to have great application potential for seawater and brackish water desalinations (Biesheuvel et al, 2017;Dorji et al, 2018), water softening (Tuan et al, 2015), selective removal of specific ions (Choi et al, 2016), resources removal and recovery (Huang et al, 2017;Kim et al, 2018), and water reclamation (Anderson et al, 2010). CDI operates at a low voltage, generally less than 1.23 V, to avoid faradaic reactions that can result in water electrolysis (Liang et al, 2017;Shanbhag et al, 2017;Zhang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Phosphorus removal mechanisms from domestic wastewater by membrane capacitive deionization and system optimization for enhanced phosphate removal

Jiang

Kim

Dorji

et al. 2019

Process Safety and Environmental Protection

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Membrane capacitive deionization (MCDI) is an emerging technology for effective removal of charged pollutants from the water sources including domestic wastewater. In this work, a lab-scale MCDI system was employed to investigate its feasibility for effective phosphorus removal from domestic wastewater. The effect of phosphate equilibrium reactions on the ion sorption behaviour was studied in sodium phosphate buffer solution at typical pH range maintained in a real domestic raw wastewater effluent (between 6.5 and 8.5). The results demonstrated that phosphate equilibrium system has positive impact on the degree of inorganic phosphorus (P) adsorption capacity in aqueous solution. In addition, the ion selectivity of P over other co-existing anions (Cl ,SO ) were experimentally studied using a synthetic wastewater solution. And it was found that the preferential electrosorption sequence of the competitive anions is: Cl SO P, while the initial ion concentration order in the synthetic feed solution is: Cl 1.90 mM P 0.40 mM SO 0.32 mM .The experiments with diverse operating conditions revealed that the optimal adsorption of inorganic phosphorus over chloride and sulphate can be achieved in some extent with slower flow rates and higher applied potentials (less than 1.23 V).

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“…Magnetic-based nanomaterials are used to remove impurities and the extraction of nanomaterials from treated water is achieved by using external magnets. Tuan et al [134] showed that capacitive deionization can be used for water purification to reduce the harshness of water by using an electrochemical double layer. There is extensive ongoing research on the use of reduced graphene oxide as a catalyst as compared to all other carbon-based materials.…”

Section: Recent Research Papers On Water Purification Using Carbon Mamentioning

confidence: 99%

Carbon Nanoparticles as Sources for a Cost-Effective Water Purification Method: A Comprehensive Review

Kotia

Yadav

Raj

et al. 2020

Fluids

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As the global population grows, the demand for cost-effective and eco-friendly water purification methods is increasing, which presently is at its peak due to the increase of impurities in water and the increasing awareness of waterborne disease. Carbon-based materials, which includes activated carbon, carbon nanotubes (CNTs), graphene, graphene oxide (GO), reduced graphene oxide (rGO), fullerene, and carbon dots, are observed as potential candidates for water treatment. In the present review, developments related to water purification methods using carbon nanomaterials over the last decade are critically summarized, with an emphasis on their thermophysical properties. The fabrication techniques for activated carbon, CNTs, graphene, and graphene oxide are presented, with an emphasis on the properties of carbon materials that allow their usage for water purification. Then, an extensive review of 71 patents dedicated to water purification using carbon materials such as activated carbon and cotton fibers is performed. Subsequently, the more important research studies on water purification using carbon nanomaterials are discussed, showing that CNTs, GO, and rGO are widely used in water treatment processes. The present review critically discusses the recent developments and provides important information on water purification using carbon materials.

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Improvement of water softening efficiency in capacitive deionization by ultra purification process of reduced graphene oxide

Cited by 32 publications

References 11 publications

Reduced Graphene Oxide Membranes as Potential Self-Assembling Filter for Wastewater Treatment

Reduced Graphene Oxide Membranes as Potential Self-Assembling Filter for Wastewater Treatment

Phosphorus removal mechanisms from domestic wastewater by membrane capacitive deionization and system optimization for enhanced phosphate removal

Carbon Nanoparticles as Sources for a Cost-Effective Water Purification Method: A Comprehensive Review

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