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Your search keyword '"Hongrui Ma"' showing total 4 results
Start Over Author "Hongrui Ma" Publisher elsevier b.v.
4 results on '"Hongrui Ma"'

1. Reduction of oxygen to H2O2 at carbon felt cathode in undivided cells. Effect of the ratio between the anode and the cathode surfaces and of other operative parameters

Author

Alessandro Galia, Onofrio Scialdone, Hongrui Ma, Pengfei Ma, Simona Sabatino, Ma P., Ma H., Galia A., Sabatino S., and Scialdone O.

Subjects
Materials science, Electrochemical reduction of oxygen, chemistry.chemical_element, Filtration and Separation, 02 engineering and technology, Electrochemistry, Oxygen, Analytical Chemistry, Cathodic protection, law.invention, chemistry.chemical_compound, 020401 chemical engineering, law, Undivided cell, 0204 chemical engineering, Hydrogen peroxide, Carbon felt, Separator (electricity), Ratio between anode and cathode surface, Settore ING-IND/27 - Chimica Industriale E Tecnologica, 021001 nanoscience & nanotechnology, Cathode, Anode, chemistry, Chemical engineering, Effect of operating parameter, Electro-Fenton, 0210 nano-technology, Current density
Abstract

In the last years, the electrochemical conversion of oxygen to hydrogen peroxide at carbon felt has been largely studied in order to define a new route for the production of H2O2 and to optimize the electro-Fenton process, which is based on the cathodic generation of H2O2. In particular, many studies regarding electro-Fenton process were carried out in undivided cells in order to avoid the costs of the separator and to reduce the cell potentials. Hence, in order to optimize the cathodic conversion of oxygen to H2O2 in undivided cells, the effect of many parameters linked to the anodic process were here evaluated. In particular, it was demonstrated that the performances of the process strongly depends on the ratio between the cathode and the anode surfaces, the nature of the anode, the mixing rate and the current density.

Published
2019

2. Electrochemical treatment of real wastewater. Part 1: Effluents with low conductivity

Author

Hongrui Ma, Pengfei Ma, Simona Sabatino, Onofrio Scialdone, Alessandro Galia, Ma, Pengfei, Ma, Hongrui, Sabatino, Simona, Galia, Alessandro, and Scialdone, Onofrio

Subjects
Materials science, Supporting electrolyte, General Chemical Engineering, Sodium, chemistry.chemical_element, 02 engineering and technology, Wastewater treatment, 010501 environmental sciences, Conductivity, Electrochemistry, 01 natural sciences, Industrial and Manufacturing Engineering, Low conductivity, Environmental Chemistry, Chemical Engineering (all), Micro reactor, Effluent, 0105 earth and related environmental sciences, Boron doped diamond, Waste management, Anodic oxidation, Chemistry (all), General Chemistry, 021001 nanoscience & nanotechnology, Real wastewater, Electrochemical oxidation, Wastewater, Chemical engineering, chemistry, 0210 nano-technology
Abstract

The treatment of a real wastewater characterized by low conductivity was performed by anodic oxidation at boron doped diamond (BDD) in both conventional and microfluidic cells. The electrolyses carried out in conventional cells without supporting electrolyte were characterized by very high TOC removals but excessively high energetic consumptions and operating costs. The addition of sodium sulphate, as supporting electrolyte, allowed to strongly reduce the cell potentials and consequently the energetic consumptions and the operating costs. However, under various operating conditions, the addition of Na2SO4 caused a lower removal of the TOC. The best results in terms of both TOC removal, energetic consumptions and operating costs (about 1 €/m3) were obtained using a cell with a very low inter-electrode distance (50 µm) with no addition of a supporting electrolyte.

Published
2018

3. Three-dimensional interconnected porous tablet ceramic: Synthesis and Pb(II) adsorption.

Author

Hongrui Ma, Yani Hei, Ting Wei, and Huan Li

Subjects
*CERAMIC materials synthesis, *POROUS materials, *ZIRCONIUM, *LEAD, *METAL absorption & adsorption, *MONTMORILLONITE
Abstract

A novel porous tablet material (PTM) was developed from zirconium pillared montmorillonite (Zr-MMT) by dry pressing technique combined with sacrificial template (polymethylmethacrylate). The developed PTM can be effectively separated from water. The layered structure of montmorillonite was still intact and the three-dimensional interconnected porosity of PTM was evenly distributed, which means that PTM has good permeability. The specific surface area and total pore volume of PTM were 80.04 m²/g and 0.28 m³/g, respectively, indicating that the PTM can provide a large number of vacant surface active sites. The saturated adsorption capacity to Pb(II) was 215.52 mg/g, which was much higher than that of montmorillonite type clay adsorbents. These findings demonstrate that PTM could be used as separable adsorbent for Pb(II) removal from aqueous solution. [ABSTRACT FROM AUTHOR]

Published
2017
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4. Facile approach for nanoconfinement of multilayer graphene oxide with polyether polyurethane sponge as biological carrier for the establishment of microalgal-bacterial bioreactor.

Author

Chao, Zhu, Jingru, Xu, Ahmad, Momina, Khan, Bushra Zia, Yongyong, Hao, Hongrui, Ma, and Mahmood, Zarak

Subjects
*SPONGE (Material), *GRAPHENE oxide, *SEWAGE disposal plants, *MICROBIAL growth, *CARBON metabolism, *ACTIVATED sludge process
Abstract

[Display omitted] • A facile approach for nano-confinement of PP sponge with multilayer GO. • Improved interfacial interaction of GO and PP promoting bio-compatibility. • Tailored GO-PP improved biofilm growth and carbon metabolism. • Significant trace amount antibiotic removal (>85 %) over 20 cycles. Physically precise and mechanically robust biocarrier is basic and urgent requirement of algal-bacterial wastewater treatment plants for homogenously biofilm growth. Herein, a highly efficient graphene oxide (GO) coordinated polyether polyurethane (PP) sponge was synthesized through GO incorporation into PP sponge to improve the GO coating, followed by UV-light treatment for industrial application. The resulted sponge showed remarkable physiochemical characteristics, excellent thermal (>0.02 Wm−1 K−1) and mechanical (>363.3 KPa) stability. To test the potential of sponge in real world scenarios, the activated sludge from real wastewater treatment plant was utilized. Interestingly, the GO-PP sponge enhanced the electron transfer between microorganisms and promoted the standardized microorganism's growth and biofilm formation (22.7 mg/d per gram sponge, 172.1 mg/g), providing the feasibility to accomplish a symbiotic system within specifically design upgraded algal-bacterial reactor. Furthermore, the continuous flow process by utilizing GO-PP sponge in algal-bacterial reactor demonstrated the effectiveness in treating low concentration antibiotic wastewater, presenting 86.7 % removal rate and >85 % after 20 cycles. Overall, this work illustrates an applicable strategy to develop a sophisticated modified pathway for the next-generation biological-based applications. [ABSTRACT FROM AUTHOR]

Published
2023
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