Thi Tran Nguyen Binh, Vietnam
Thi Tran Nguyen Binh, Vietnam

Van Lang Private University is one of the first private universities in Vietnam under the administration of the Ministry of Education of Vietnam. The university is located in Ho Chi Minh City, Viet Nam. Van Lang University was established in 1995. It was named after the ancient Vietnamese kingdom of Văn Lang. Wikipedia.

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Le T.X.H.,Montpellier University | Le T.X.H.,Van Lang University | Flaud V.,Charles Gerhardt Institute | Bechelany M.,Montpellier University | And 2 more authors.
Electrochimica Acta | Year: 2017

We present the effect of thermal treatment of carbon felt by gas flow containing 1% of oxygen at high temperature on the direct electron transfer and electrocatalytic oxygen reduction currents by a bilirubin oxidase (BOD) film directly adsorbed in the presence of carbon nanotubes on to a porous carbon felt (PCF). The upgraded properties (surface area, pore volume and hydrophilicity) of the resulting porous carbon felt (PCF) in comparison to commercial carbon felt (raw CF), creates a suitable support for the entrapment of MWCNTs bearing negative charges at neutral pH and BOD enzymes, all the components being entrapped in chitosan layer reticulated with glutaraldehyde. Since functional MWCNTs are usually used to facilitate DET, we introduce MWCNTs@COOH, bearing negative charges at neutral pH, in the enzyme layer to evaluate their impact on the electron transfer properties with BOD. The enzyme immobilization efficiency is examined by varying the amount of the components and the immobilization procedure. Linear sweep voltammetry (LSV) and chronoamperometry measurements are used to evaluate the electrochemical behavior of the enzymatic biocathodes. Based on the experimental results, we show that the optimized bioelectrode delivers a current density of 3.70 mA cm−2 at 0.15 V vs Ag/AgCl and could retain above 55% of its initial response after 4 months, proving its outstanding performance. This new bioelectrode allows for optimal DET-type bioelectrocatalytic activity toward O2 reduction and is a very promising candidate for the construction of 3-dimensional cathodes in (bio)-electrochemical devices needing high current output. © 2017 Elsevier Ltd


Truong L.M.,Van Lang University | Trang T.T.,Van Lang University | Dieu T.T.M.,Van Lang University
Nature Environment and Pollution Technology | Year: 2017

Solid waste generation rate plays an important role in calculation and design different elements of a municipal solid waste management system of an urban area. The survey was carried out at 644 households living in 6 selected wards of 6 districts in Ho Chi Minh City (HCMC) that have different population densities to determine generation rates and main composition (food refuses and plastic bags) in domestic solid waste. Composition of household solid waste of HCMC determined from this study will help to develop a model to predict solid waste generation rate in the future. It is also found from the study that, in 2015 household solid waste generation rate of HCMC is 0.41 kg/capita/day (SD = 0.313), food refuse generation rate is 0.23 kg/capita/day, plastic bag generation rate is 0.032 kg/capita/day, and percentages of food refuses and plastic bags in domestic solid wastes of HCMC are 61.63% and 7.67%, respectively. Statistical data indicate that generation rates of household solid waste, food refuses, and plastic bags are inversely proportional to the number of people in a family and directly proportional to the household income. The rank correlation shows no significance between the household solid waste generation rates and the urbanization levels as well as between household solid waste generation rates and days of a week. A linear regression model proposed to determine generation rates of household solid waste, household food refuse, and household plastic bags shows that household size and household income explain only 14.2% of solid waste generation rate (R2 = 0.142) and 11.9% of plastic bag generation rate (R2 = 0.119). Generation rate of food refuse (within the scope of this study) can only be estimated based on household size (R2 = 0.08). © 2017, Technoscience Publications. All rights reserved.


Huong Le T.X.,Montpellier University | Huong Le T.X.,Van Lang University | Bechelany M.,Montpellier University | Cretin M.,Montpellier University
Carbon | Year: 2017

Carbonaceous materials are abundantly used for electrochemical applications and especially for energy and environmental purposes. In this review, the carbon felt (CF) based-electrodes are discussed in a holistic manner. First of all, the study centers on the issues relevant to pristine CF materials such as manufacturing method and specific properties. The various methods and equations used to identify physical values of CF material are supplied. As main part of the review, the different modification methods for CF electrodes are described. The novel properties of fabricated materials are characterized by physical as well as electrochemical techniques. The strengths of each method are presented in the comparison with raw CF electrodes. The energy applications of CF based-electrodes are figured out in various fields such as vanadium redox flow batteries (VRFB), microbial fuel cells (MFCs), biofuel cells (BFCs), capacitors, solar cells and lithium ion batteries. For environmental applications, we focus our study on the wastewater treatment containing biorefractory pollutants by electro-Fenton (EF) process. The degradation result by EF technology using CF materials is impressive when most of toxic contaminants are mineralized to non-toxic compounds at the end of the electrolysis. To decrease the cost treatment and upgrade the treatment efficiency, the EF system has been improved by using modified electrodes or new catalyst sources. The CF materials are also investigated to apply in bio-fuel cell-Fenton in which electrons were produced from fuel cell (FC) towards zero-energy depollution. Finally, the sketches about EF pilot open new gates for application of CF materials in industrial areas. © 2017 Elsevier Ltd


Le T.X.H.,Montpellier University | Le T.X.H.,Van Lang University | Esmilaire R.,Montpellier University | Drobek M.,Montpellier University | And 5 more authors.
Journal of Physical Chemistry C | Year: 2017

A novel material was fabricated by deposition of graphitized nitrogen-doped porous carbon layer (NPC) on commercial carbon felt (CF). The NPC was obtained via atomic layer deposition of zinc oxide (ZnO) and its subsequent solvothermal conversion to zeolitic imidazolate framework (ZIF-8) followed by its carbonization under controlled atmosphere. Both physical and electrochemical properties have been evaluated by scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, nitrogen sorption, contact angle, and cyclic voltammetry measurements. The parameters affecting the growth of NPC, such as the amount of ZnO/ZIF-8 material before calcination and thermal treatment temperature, have been investigated in detail. The versatility of the as-prepared NPC/CF material was assessed by studying (i) its adsorption ability and/or (ii) its behavior as cathode in electro-Fenton process (EF) for the elimination of a model refractory pollutant (acid orange 7 (AO7)). Once used as adsorbent, the NPC/CF proved good adsorption capacity with 97% color removal of initial 0.02 mM dye concentration after 30 min. Moreover, the application of such novel cathode could also reduce the cost for EF technology by using lower energy consumption at 0.54 kWh g-1 TOC (total organic carbon). The apparent rate constant (kapp ∼ 0.8 min-1) obtained for NPC/CF was more than 7 times higher compared to pristine CF commercial electrode, thus leading to more than 90% TOC removal in 8 h. In addition, high reaction efficiency and system durability were attributed to continuous regeneration of the NPC/CF sorption capacity upon total mineralization of the pollutants accumulated at the electrode surface. Results confirmed that the new NPC/CF material behaves as a highly active electrode with attractive adsorption efficiency and at the same time it possesses an excellent electrochemical activity in the EF oxidation process for the removal of persistent water pollutants. © 2017 American Chemical Society.


Grant
Agency: European Commission | Branch: FP7 | Program: CSA-CA | Phase: ENV.2007.3.1.3.3. | Award Amount: 1.23M | Year: 2009

The general inadequate, when existing, methods of collection and disposal of solid waste in most Asian cities are causing important environmental and social harms, as human diseases spreading, environmental pollution and ground and water pollution. In order to raise awareness, promote an adequate waste collection and treatment system and the economic growth of this activity sector in a technological efficient and sustainable way, new waste management systems must be established, which also take into account the informal sector. This integrated approach should comprise technical, environmental, legal, socio-economic and financial aspects, involving the key actors at different levels to ensure an effective implementation. The proposed project aims to bring together experts and stakeholders in the field of solid waste management in Asian developing countries and Europe. The project will promote international cooperation between research organisations, universities, and social and governmental stakeholders in a European and Asian context (local waste processors, local municipalities and policy makers, local NGOs representatives, etc). A solid waste management expert and research co-ordination platform, and an expertise network, will be established in order to co-ordinate, assess and guide suitable research and strategic activities with the aim of identifying aspects like cost-effective treatment and sorting technologies, environmental impacts, gaps in technical knowledge and socio-economic and policy barriers to further execution. The network will also propose directions for futures research and for local implementation. The general aim of the proposed network will be to develop a variety of innovative, adaptable and replicable approaches to a more efficient solid waste management, integrating appropriate low-cost and efficient technologies with community-based management and their relevant governance, institutional frameworks and socio-economic constraints.


Le T.X.H.,Montpellier University | Le T.X.H.,Van Lang University | Bechelany M.,Montpellier University | Engel A.B.,Montpellier University | And 2 more authors.
Electrochimica Acta | Year: 2016

In this study, homogeneously dispersed gold particles growth onto carbon felt were fabricated by electrodeposition method followed by a thermal treatment at 1000 °C under nitrogen. The thermal treatment induced the dewetting of gold and the formation of well-crystallized gold particles that exhibited large surface area. The structural properties of the resulted Au@CF material were evaluated by SEM, XRD and TGA. We studied the electrocatalytic properties of this new gold material through the abiotic glucose oxidation in alkaline medium and the enzymatic dioxygen electroreduction by the enzyme bilirubin oxidase. Finally, we showed the potentiality of the resulting Au@CF material to build a 3-dimensional glucose hybrid biofuel cell by assemblying an abiotic anode with an enzymatic cathode. The system exhibited high electrochemical performance with an open circuit voltage of 0.71 V and a maximum power density of 310 μW cm−2 at 352 mV (by taking into account the projected surface area), in spite of a low gold loading (0.2 wt%). The advance presented in this work is the efficiency of the synthesis technique to get a new free-standing material for electrocatalysis based on gold particles with high reactive surface area for electron transfer and macropores for diffusion transport. © 2016 Elsevier Ltd


Anh P.T.,Wageningen University | My Dieu T.T.,Van Lang University | Mol A.P.J.,Wageningen University | Kroeze C.,Wageningen University | Bush S.R.,Wageningen University
Journal of Cleaner Production | Year: 2011

The concept of industrial ecology has been applied in this research to study possibilities to develop an eco-industrial cluster model for fishery production industry in Vietnam. By learning from experiments of other developed countries, we apply the principles of Industrial Ecology and of Ecological Modernization in the context of Vietnam. We design a physical-technological conceptual model for minimizing waste in agro-industries, with a case study of frozen shrimp production. The results indicate that it is possible and feasible to develop an eco-industrial cluster including aquaculture, fishery processing companies, by-product plants, and wastewater treatment units. By doing so, aquaculture and industry can cooperate for environmentally sound development. Actors and institutions that may govern the proposed eco-industrial cluster of shrimp processing industry are also analysed in this paper. The economic feasibility of the designed eco-agro industrial cluster for fish production in Vietnam depends on the energy savings and effective revenues gained from selling the produced valuable materials, such as Chitosan and animal feed. © 2011 Elsevier Ltd. All rights reserved.


Bosma R.,Wageningen University | Anh P.T.,Van Lang University | Potting J.,Wageningen University
International Journal of Life Cycle Assessment | Year: 2011

Purpose: Intensive striped catfish production in the Mekong Delta has, in recent years, raised environmental concerns. We conducted a stakeholder-based screening life cycle assessment (LCA) of the intensive farming system to determine the critical environmental impact and their causative processes in producing striped catfish. Additional to the LCA, we assessed water use and flooding hazards in the Mekong Delta. Materials and methods: The goal and scope of the LCA were defined in a stakeholder workshop. It was decided there to include all processes up to the exit-gate of the fish farm in the inventory and to focus life cycle impact assessment on global warming, acidification, eutrophication, human toxicity, and marine (MAET) and freshwater aquatic ecotoxicity (FWET). A survey was used to collect primary inventory data from 28 farms on fish grow-out, and from seven feed mills. Hatching and nursing of striped catfish fingerlings were not included in the assessment due to limited data availability and low estimated impact. Average feed composition for all farms had to be applied due to limitation of budget and data availability. Results and discussion: Feed ingredient production, transport and milling dominated most of the impact categories in the LCA except for eutrophication and FWET. Most feed ingredients were produced outside Vietnam, and the impact of transport was important. Because of the screening character of this LCA, generic instead of specific inventory data were used for modelling feed ingredient production. However, the use of generic data is unlikely to have affected the main findings, given the dominance of feed production in all impact categories. Of the feed ingredients, rice bran contributed the most to global warming and acidification, while wheat bran contributed the most to eutrophication. The dominance of both was mainly due to the amounts used. Fishmeal production, transport and energy contributed the most to MAET. The biggest impacts of grow-out farming in Vietnam are on eutrophication and FWET. Water nutrient discharge from grow-out farming was high but negligible compared with the natural nutrient content of the Mekong River. The discharge from all grow-out farms together hardly modified river water quality compared with that before sector expansion. Conclusions: Feed production, i.e. ingredient production and transport and milling, remains the main contributor to most impact categories. It contributes indirectly to eutrophication and FWET through the pond effluents. The environmental impact of Pangasius grow-out farming can be reduced by effectively managing sludge and by using feeds with lower feed conversion ratio and lower content of fishery products in the feed. To consider farm variability, a next LCA of aquaculture should enlist closer collaboration from several feed-milling companies and sample farms using their feeds. Future LCAs should also preferably collect specific instead of generic inventory data for feed ingredient production, and include biodiversity and primary production as impact categories. © The Author(s) 2011.


PubMed | Van Lang University and Wageningen University
Type: Journal Article | Journal: Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA | Year: 2015

Ho Chi Minh City is a large city that will become a mega-city in the near future. The city struggles with a rapidly increasing flow of municipal solid waste and a foreseeable scarcity of land to continue landfilling, the main treatment of municipal solid waste up to now. Therefore, additional municipal solid waste treatment technologies are needed. The objective of this article is to support decision-making towards more sustainable and cost-effective municipal solid waste strategies in developing countries, in particular Vietnam. A quantitative decision support model is developed to optimise the distribution of municipal solid waste from population areas to treatment plants, the treatment technologies and their capacities for the near future given available infrastructure and cost factors.


PubMed | Van Lang University and Montpellier University
Type: | Journal: Chemosphere | Year: 2017

The evolution of the degradation by-products of an acetaminophen (ACE) solution was monitored by HPLC-UV/MS and IC in parallel with its ecotoxicity (Vibrio fischeri 81.9%, Microtox

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