Electrochemical wastewater treatment with carbon nanotube filters coupled with in situ generated H<sub>2</sub>O<sub>2</sub>

Liu, Yanbiao; Xie, Jianping; Ong, Choon Nam; Vecitis, Chad D.; Zhou, Zhi

doi:10.1039/c5ew00128e

Cited by 78 publications

(49 citation statements)

References 55 publications

(102 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whereas, at the cathode, oxygen is reduced to form hydrogen peroxide, H 2 O 2 , a strong oxidant (E º =1.763 V) to oxidize various organic pollutants and for in-situ membrane cleaning as shown in Equation 7 [40,41]. As reported by Plakas et al [42], H 2 O 2 production is affected by electrode materials, applied potential, pH, and ionic strength.…”

Section: Fundamental Of Embrmentioning

confidence: 92%

An Overview of Electrically-enhanced Membrane Bioreactor (EMBR) for Fouling Suppression

Ho¹,

Teow²,

Ang³

et al. 2017

JESTR

View full text Add to dashboard Cite

Membrane fouling is the major challenges that hinders the widespread application of membrane bioreactor (MBR). Recently, application of electricity in electrically-enhanced MBR (EMBR) to suppress membrane fouling has gained much attention among research communities. This paper presents an overview of developments on EMBR for fouling suppression in wastewater treatment. The flow of electricity has stimulated several electrokinetic processes including electrophoresis/electrochemical process, and electrocoagulation which are the major fouling suppression mechanisms employed in EMBR. In electrophoresis, the membrane fouling is suppressed by the increased electrorepulsive force between negatively-charged foulants and cathode membrane under the influence of an electric field. Besides, electric field also induces simultaneous electrochemical oxidation and reduction which generate chemicals to degrade pollutant in wastewater. On top of that, use of active anode is reminiscent of electrocoagulation which produces cation coagulants in EMBR that capable to neutralize charge of the foulants and promotes flocs formation. This increases flocs size and sedimentation rate thereafter reduces adhesion of foulants on the membrane surface. Lastly, bioelectricity generation of microbial fuel cell (MFC) integrated with MBR to attain self-sustained EMBR has been studied. Self-sustained EMBR combines the advantages of MFC and MBR in treating wastewater and energy recovery simultaneously. Overall, it is evidenced that MBR and electrokinetic processes have a synergetic enhancement effect in EMBR system.

show abstract

Section: Fundamental Of Embrmentioning

confidence: 92%

An Overview of Electrically-enhanced Membrane Bioreactor (EMBR) for Fouling Suppression

Ho¹,

Teow²,

Ang³

et al. 2017

JESTR

View full text Add to dashboard Cite

show abstract

“…The CNTs-based electrode exhibited 1.15 times more permeation flux compared with the electrode without CNTs [136]. The electrochemically activated CNTs filters were developed for wastewater treatment [137]. Thus, the solutions for implementing water reuse, seawater desalination, and water purification more efficiently and cost-effectively are expected to emerge from the use of nanotechnology with CNTs.…”

Section: Wastewater Treatmentmentioning

confidence: 99%

Carbon Nanotubes-Based Nanomaterials and Their Agricultural and Biotechnological Applications

et al. 2020

View full text Add to dashboard Cite

Carbon nanotubes (CNTs) are considered a promising nanomaterial for diverse applications owing to their attractive physicochemical properties such as high surface area, superior mechanical and thermal strength, electrochemical activity, and so on. Different techniques like arc discharge, laser vaporization, chemical vapor deposition (CVD), and vapor phase growth are explored for the synthesis of CNTs. Each technique has advantages and disadvantages. The physicochemical properties of the synthesized CNTs are profoundly affected by the techniques used in the synthesis process. Here, we briefly described the standard methods applied in the synthesis of CNTs and their use in the agricultural and biotechnological fields. Notably, better seed germination or plant growth was noted in the presence of CNTs than the control. However, the exact mechanism of action is still unclear. Significant improvements in the electrochemical performances have been observed in CNTs-doped electrodes than those of pure. CNTs or their derivatives are also utilized in wastewater treatment. The high surface area and the presence of different functional groups in the functionalized CNTs facilitate the better adsorption of toxic metal ions or other chemical moieties. CNTs or their derivatives can be applied for the storage of hydrogen as an energy source. It has been observed that the temperature widely influences the hydrogen storage ability of CNTs. This review paper highlighted some recent development on electrochemical platforms over single-walled CNTs (SWCNTs), multi-walled CNTs (MWCNTs), and nanocomposites as a promising biomaterial in the field of agriculture and biotechnology. It is possible to tune the properties of carbon-based nanomaterials by functionalization of their structure to use as an engineering toolkit for different applications, including agricultural and biotechnological fields.

show abstract

“…A electrochemical CNT filter could bring this concept one step further by not only physically adsorb the pollutants but also electrochemically oxide the pollutants in situ [19]. However, most of the reported CNT filters are generally <10 cm in diameter and further upscaling of these CNT filters is challenging [20]. Another approach to utilize CNTs is to construct 3D macrostructures.…”

Section: Introductionmentioning

confidence: 99%

Conductive Cotton Filters for Affordable and Efficient Water Purification

Xia

Cheng

et al. 2017

Catalysts

Self Cite

View full text Add to dashboard Cite

It is highly desirable to develop affordable, energy-saving, and highly-effective technologies to alleviate the current water crisis. In this work, we reported a low-cost electrochemical filtration device composing of a conductive cotton filter anode and a Ti foil cathode. The device was operated by gravity feed. The conductive cotton filter anodes were fabricated by a facile dying method to incorporate carbon nanotubes (CNTs) as fillers. The CNTs could serve as adsorbents for pollutants adsorption, as electrocatalysts for pollutants electrooxidation, and as conductive additives to render the cotton filters highly conductive. Cellulose-based cotton could serve as low-cost support to 'host' these CNTs. Upon application of external potential, the developed filtration device could not only achieve physically adsorption of organic compounds, but also chemically oxide these compounds on site. Three model organic compounds were employed to evaluate the oxidative capability of the device, i.e., ferrocyanide (a model single-electron-transfer electron donor), methyl orange (MO, a common recalcitrant azo-dye found in aqueous environments), and antibiotic tetracycline (TC, a common antibiotic released from the wastewater treatment plants). The devices exhibited a maximum electrooxidation flux of 0.37 mol/h/m 2 for 5.0 mmol/L ferrocyanide, of 0.26 mol/h/m 2 for 0.06 mmol/L MO, and of 0.9 mol/h/m 2 for 0.2 mmol/L TC under given experimental conditions. The effects of several key operational parameters (e.g., total cell potential, CNT amount, and compound concentration) on the device performance were also studied. This study could shed some light on the good design of effective and affordable water purification devices for point-of-use applications.

show abstract

Electrochemical wastewater treatment with carbon nanotube filters coupled with in situ generated H₂O₂

Cited by 78 publications

References 55 publications

An Overview of Electrically-enhanced Membrane Bioreactor (EMBR) for Fouling Suppression

An Overview of Electrically-enhanced Membrane Bioreactor (EMBR) for Fouling Suppression

Carbon Nanotubes-Based Nanomaterials and Their Agricultural and Biotechnological Applications

Conductive Cotton Filters for Affordable and Efficient Water Purification

Contact Info

Product

Resources

About

Electrochemical wastewater treatment with carbon nanotube filters coupled with in situ generated H2O2

Cited by 78 publications

References 55 publications

An Overview of Electrically-enhanced Membrane Bioreactor (EMBR) for Fouling Suppression

An Overview of Electrically-enhanced Membrane Bioreactor (EMBR) for Fouling Suppression

Carbon Nanotubes-Based Nanomaterials and Their Agricultural and Biotechnological Applications

Conductive Cotton Filters for Affordable and Efficient Water Purification

Contact Info

Product

Resources

About

Electrochemical wastewater treatment with carbon nanotube filters coupled with in situ generated H₂O₂