Ha Manh Bui

Saigon University · Environmental Science

Chitosan derived from waste shrimp shells was experimentally evaluated to treat reactive dye (red 24) in aqueous solution. The research was conducted using one-factor-at-a-time experiment design (i.e., pH, reaction time, agitation speeds, initial dye, and chitosan concentration) to investigate dye removal efficiencies by reducing colour and COD par...

5-[(2-Methyl-1H-benzimidazol-1-yl)methyl]-1,3,4-oxadiazole-2-thiol or 5-[(2-methyl-1H-benzimidazol-1-yl)methyl]-4-(4-methyl-phenyl)-1,2,4-triazol-3-thiol which were prepared starting from 2-methylbenzimidazole in the reaction with appropriate N-aryl-2-chloroacetamides aforded two series of N-aryl-2-{5-[(2-methyl-1H-benzimidazol-1-yl)methyl]-1,3,4-o...

This study presents an application of artificial neural networks (ANNs) to predict the dye removal efficiency (color and chemical oxygen demand value) of Electrocoagulation process from Sunfix Red S3B aqueous solution. The Bayesian regulation algorithm was applied to train the networks with experimental data including five factors: pH, current dens...

It remains uncertain whether diatom and nematode assemblages can reflect the same ecological status in eutrophic reservoirs. To address this uncertainty, we collected diatom and nematode assemblages and measured environmental variables in the tropical eutrophic Tri An Reservoir (TAR) in Vietnam. We assessed the ecological status of each community u...

For the conversion of lignocellulosic wastes into biofuels, the use of biochar-modified nanocatalysts offers a promising strategy with the potential to reduce carbon emissions and value waste. The types of nanocatalysts used, catalyst preparation and incorporation with biochar support, choice of appropriate biochar feedstocks, biochar stability at...

This study investigates the variations of microcystins (MCs) in water, cyanobacterial blooms, sediment, and aquatic organisms collected from the Dau Tieng Reservoir (DTR). Vietnam. High-performance liquid chromatography (HPLC) was employed to measure MC concentrations in various target samples. Results indicate that Microcystis spp. dominates as th...

This study introduces an innovative approach, harnessing photobioreactors (PBRs) as algae windows to optimize energy efficiency and environmental protection in building design. The integration of microalgae cultivation systems into windows presents a promising avenue for multifaceted benefits, encompassing energy savings, improved indoor daylight l...

This study evaluates the performance of the Internal Circulation eXperience (ICX) reactor in treating high-strength paper mill wastewater in the south of Vietnam. The ICX reactor effectively managed organic concentrations (sCOD) of up to 11,800 mg/L. Results indicate a volumetric loading rate (VLR) of 26.8 kg/m3 × day, achieving processing efficien...

This study explored the treatment of Leucomalachite Green (LMG) solutions using an electron beam and sodium persulfate (Na2S2O8), employing Box-Behnken design (BBD) to optimize operational variables such as absorbed dose, initial pH and Na2S2O8 concentration. The findings highlighted an optimal absorbed dose of 4.5 kGy, a Na2S2O8 concentration of 1...

Chitosan is a good adsorbent but has poor effectiveness against some dyes. Therefore, in this study, we synthesized composite materials of prepared crab shell chitosan with ZnO and PVA to improve adsorption efficiency. The ZnO/CTS and ZnO/PVA/CTS composites were synthesized by dissolving the components into a solution with the help of ultrasound an...

This study involves an extensive examination of the brewing industry, specifically focusing on Company A in South Vietnam alongside five other Vietnamese beer companies (B, C, D, E, and F). By employing a multifaceted approach that integrates Life Cycle Assessment (LCA), evaluations of emission loads, and the establishment of criteria for a circula...

This study explores the synthesis and characterization of cellulose acetate/zeolite (CA/Ze) fibers as effective adsorbents for the removal of Pb2+ and Cu2+ ions from aqueous solutions. Cellulose acetate was derived from sugarcane bagasse (SCB) and integrated with zeolite to create CA/Ze fibers. Characterization techniques, including FTIR spectrosco...

This study explores the adsorption of doxycycline (DOX) from aqueous solutions onto biochar derived from banana peel, which was prepared using a potassium hydroxide activation method (KOH-BPB). The biochar properties were characterized based on morphology, surface area (SBET of 710.241 m2 g−1), functional groups, and surface charge (pHPZC = 7.7). P...

In a competitive market, enterprises should strive to offer excellent services and products while implementing robust environmental policies that not only attract customers but also foster loyalty. This study is intended to fill a gap in brand dimensions (including brand identity, brand awareness, brand love and brand loyalty) through the role of p...

This investigation is a review of the potential of aerobic granular sludge membrane bioreactor (AGMBR) in wastewater treatment due to the advantage of combination of membrane and aerobic granules for reducing membrane fouling and enhancing removal performance. The AGMBR is the same as the membrane bioreactor (MBR), but the activated sludge is repla...

This study optimized biodiesel synthesis from Pangasius fat using a Box-Behnken experimental design. The manipulation of key variables included the CoFe2O4 catalyst dosage, the methanol-to-fat molar ratio, and the ultrasonic wave amplitude. We determined optimal conditions for biodiesel synthesis through the central runs, resulting in a remarkable...

Background: As the most widely-used oral anesthetic, benzocaine (BZC), is increasingly detected in municipal wastewater and regarded as an emerging contaminant. Thus, it would be highly imperative to develop useful methods to eliminate BZC from water. However, very few studies have been ever reported, and only photo-catalysis of BZC was attempted....

Although sediments are considered to be a major sink for microplastics (MP), there is still a relative lack of knowledge on the factors that influence the occurrence and abundance of MP in riverine sediments. The present study investigated the occurrence and distribution of MP in riverine sediments collected at twelve sites representative of differ...

Human beings are frequently exposed to a mixture of chemical pollutants through the ingestion of contaminated drinking water. The present study aimed to assess the ecological and human health risks associated with the contamination of cyanotoxins and heavy metals in a drinking water supply reservoir, the Tri An Reservoir (TAR), in Vietnam. Results...

The present study delved into the enhancement of essential oil (EO) extraction process from Chlorella sp. through the implementation of ultrasound-assisted extraction. The Taguchi method was instrumental in determining the ideal parameters for the extraction process, which encompassed ultrasonic amplitude, reaction duration, hexane/ethanol (HE/EtOH...

Vietnam has pledged to reduce methane emissions by 30%, increase renewable energy utilization, and decrease coal-based electrical power, with a goal of achieving net-zero carbon dioxide emissions by 2050. Among renewable energy sources, solar energy has gained attention due to Vietnam’s favorable location near the equator. This study aims to evalua...

2-Methylquinazolin-4(3H)-one was prepared by the reaction of anthranilic acid, acetic anhydride, and ammonium acetate. The reaction of 2-methylquinazolin-4(3H)-one with N-aryl-2-chloroacetamides in acetone in the presence of potassium carbonate gave nine N-aryl-2-(2-methyl-4-oxoquinazolin-3(4H)-yl)acetamide compounds. The structures of these compou...

This study developed an antifouling coating for polyethersulfone (PES) membranes by tuning the bandgap of TiO2 with Cu nanoparticles (NPs) via a polyacrylic acid (PAA)-plasma-grafted intermediate layer. Cu NPs were synthesized at different molar ratios and precipitated onto TiO2 using the sol-gel method. The resulting Cu@TiO2 photocatalysts were ch...

Ciprofloxacin (CIP) represents the most typical fluoroquinolone antibiotic and is increasingly detected in water environments. For eliminating CIP from water, a hollow-engineered nanostructured cobalt embedded nitrogen-doped carbon (H-Co@NC) is developed...

This literature review addresses the presence of plastic in domestic wastewater, an increasingly important facet of the widespread use of plastic and its detrimental effects on the environment, with a focus on microplastics (MPs) in sewage sludge and their implications for a circular economy. Extensive research has been conducted on the occurrence...

Microplastics are a growing concern due to their potential negative environmental and human health impacts. This study investigated the physiochemical changes in polyethylene terephthalate (PET) microplastics upon aging in air, seawater, and freshwater through exposure to Xenon light (artificial aging) and sun (natural aging). We used SEM to examin...

The sustainable development of enterprises, which has economic, commercial, ethical, social, and environmental dimensions, is increasingly attracting attention. Focusing on the dimensions of sustainable development is essential in the present day. This study adds to the literature by examining the role of the dimensions of corporate social responsi...

Fire accidents cause damage and injuries; hence, fire protection is imperative for building construction. Smoke control reduces smoke concentrations as well as the temperature to enable evacuation of building residents. Moreover, firefighters easily extinguish fire with low smoke concentrations and temperatures. In this study, the Fire Research Sta...

Acknowledging that resource efficiency as well as ecosystem protection are crucial goals to tackle has led to a deep rethinking in the way wastewater has been dealt with up to the 20th century. Indeed, pollution reduction to harmless levels has been the main focus of conventional wastewater treatment plants which have deployed effective and reliabl...

As cobalt (Co) has been the most useful element for activating Oxone to generate SO4•−, this study aims to develop a hierarchical catalyst with nanoscale functionality and macroscale convenience by decorating nanoscale Co-based oxides on macroscale supports. Specifically, a facile protocol is proposed by utilizing Cu mesh itself as a Cu source for...

Anthracnose caused by Colletotrichum truncatum (C. truncatum) fungus, a seriously damaged in many soybean growing areas, has almost no effective control strategy. Recently, biostimulants for disease prevention of plants have been considered a feasible solution. In this study, the chitinase-induced effect on soybean plants of various oligochitosan-Z...

In this study, a panel autoregressive distributed lag (ARDL) approach was employed to investigate the nexus between N2O emissions and economic growth in Vietnam with respect to six parameters, i.e., gross domestic product (GDP), foreign direct investment (FDI), gross fixed capital formation (GDI), industry (IND), services (SEV), and trade openness...

Bis(4-hydroxyphenyl)methanone (BHPM), a common ultraviolet stabilizer and filter (USF), is extensively added in sunscreens; however, BHPM is proven as an endocrine disruptor, posing a serious threat to aquatic ecology, and BHPM should be then removed. As sulfate radical (SO4•−) could be useful for eliminating emerging contaminants, oxone appears as...

As the extensively-employed UV stabilizer, 2,4-dihydroxybenzophenone (benzophenone-1 (BP1)) has been proven an endocrine disruptor, developing of useful technologies for eliminating BP1 is highly desired. Because SO4•−-based oxidation technologies are promising for eliminating emerging pollutants, cobalt (Co) is an extremely useful catalyst for per...

The incorporation of biofilm process in activated sludge process is beneficial in enhancing treatment performance. In this study, biologically recovered polyhydroxyalkanoates (PHA) were explored as an eco-friendly alternative to conventional materials as the biofilm carrier. The PHA was shaped in a pellet form, melt-fused and added as a biofilm car...

This study aimed to design hollow rhombic cobalt sulfide (HRCS) via a single-step sulfidation of cobaltic metal organic framework (CoMOF) as a template. The obtained HRCS with abundance of defects and sulfur vacancy (SV) was then employed for degradation of Novantisol (NVT), a sunscreen agent, through Oxone activation. The superior catalytic perfor...

Because of the small size effect leading to the high bandgap of TiO2 P25, the photocatalytic membrane using this photocatalyst has low antifouling efficiency. This study prepared CuO@TiO2 composite photocatalyst with a lower bandgap than TiO2 P25 and used it as antifouling coatings on the PES membrane with PAA intermediate adhesive layer. PAA was g...

In this study, the highly stable ZrO2 was bandgap-tuned with copper nanoparticles and it was used as the coating on PAA/PES membranes. The photocatalyst was synthesized by chemical reduction of Cu2+ and precipitation of Cu nanoparticles on the surface of ZrO2. Photocatalyst characterizations were used such as FTIR, SEM-EDS, XRD, BET, UV-Vis DRS, XP...

This study explores the nexus between greenhouse gases (GHG) with economic growth (GDP), fossil fuel consumption (FEC), renewable energy (REC) and trade openness (TRO) in Vietnam by using the panel ARDL approach from 1980 to 2018 through the data set retrieved from the World Bank (2022). The results show that all four factors impact GHG emissions,...

Membrane bioreactor (MBR) process has been recognized as the promising technology for wastewater treatment/reuse in the 21st century. Thus this chapter is introduced to provide a comprehensive review of the MBR process, covering not only the principle of MBR but also the aspect of the practice of wastewater treatment, fouling, economic of MBR. Here...

In this study, Vietnam's refined pangasius fat (RPF) was used to produce biodiesel fuel. A Taguchi design was used to optimize the transesterification process, which included four variables: molar ratios of MeOH and extracted oil (MeOH/ RPF), catalyst concentration (KOH), reaction time, and ultrasonic amplitude. The best conversion efficiency was 9...

The present work examines the decolorization of reactive red 24 (RR24) from an aqueous solution via the electron beam (EB) and aeration method. Response surface methodology (RSM) with central composite design (CCD) was used to optimize the treatment with the four selected variables, i.e., absorbed dose, H 2 O 2 concentration, initial pH (in EB syst...

Plasticizers such as di(2-ethylhexyl) phthalate (DEHP) and tris (2-butoxyethyl) phosphate (TBOEP) are manufactured chemicals produced in high volumes. These chemicals are frequently detected in the aquatic environment and cause toxic effects on organisms. In this study, we assessed the chronic impacts of DEHP and TBOEP, respectively, at the concent...

Gamma irradiation has received increasing attention due to its high potential in the degradation of recalcitrant pollutants. Thus, in the present study, gamma irradiation was used for the degradation of bromuconazole with the presence of hydrogen peroxide (H2O2) as a source of •OH and humic acid as natural organic matter. The effects of initial con...

While H2 gas is conventionally purged during hydrogenation of bromate in the presence of catalysts, the low solubility of H2 gas leads to wasteful consumption of H2 gas. Reductants in solid forms, which act as storage media of H2, would be preferable, and borohydrides, including NaBH4, and NH3BH3 are promising candidates. Although ruthenium (Ru) is...

This paper analyzes the impact of country disclosure on the firm value of listed companies in Viet Nam. As the sharp increase in population and urbanization has led to the depletion of water resources, the issue of water management is having an impact on the sustainable development of businesses. These days stakeholders and investors are taking thi...

Because of certain limitations in the use of conventional hydrophobic membranes in membrane distillation (MD), many studies have attempted to find alternatives to these membranes. There are many criteria for replacement membranes but the main criteria such as stability, cost, and environmental friendliness are the most important properties. When th...

The most extensively used sunscreen protecting agent, Ensulizole, has been proven to exhibit hormone disrupting effects. To establish efficient processes to destruct Ensulizole in water, SO4•−-involved advanced oxidation processes using monopersulfate (MPS) seem useful. Since cobalt (Co) is the most capable of metal for activating MPS, Co3O4 appear...

Electron-beam (EB) irradiation was employed to degrade enrofloxacin (ENR) in an aqueous solution. The algal growth inhibition test revealed that ENR exhibited low toxicity against the cyanobacterium Arthrospira sp., with an EC 50-96 h value of 5.17 mg/L. The Taguchi design also involved finding the best optimum for ENR treatment using EB. Results r...

The occurrence of cyanobacterial blooms (CYBs) associated with cyanotoxins has been reported worldwide. While planktonic cyanobacteria and the contamination of microcystin (MC) in the water column have been the subject of many investigations, little attention is paid to the benthic cyanobacterial communities and MC concentration in the benthic envi...

Besides photocatalysts, novel catalytic wet-air oxidation (CWAO) catalysts capable of operating under mild conditions are a potential candidate to fabricate antifouling filtration membranes. This study optimized the CWAO catalyst consisting of three metal oxide components (ZnO, CuO, and Fe3O4) and used it to fabricate composite membranes with PES (...

Although in a critical position in the economy, the paper industry releases a lot of wastewater that requires adequate treatment for sustainable development. This study presents an application of Life cycle assessment (LCA) with the ReCiPe tool on the wastewater treatment plant (WWTP) of a paper factory in Vietnam to evaluate the environmental effe...

In this study, biochar derived from spent coffee grounds (SCGB) was used to adsorb norfloxacin (NOR) in water. The biochar properties were interpreted by analysis of the specific surface area, morphology, structure, thermal stability, and functional groups. The impacts of pH, NOR, and ion's present on SCGB performance were examined. The NOR adsorpt...

Microplastics (MPs) are small (< 5 mm) plastic particles that are widely found in marine, freshwater, terrestrial and atmospheric environments. Due to their prevalence and persistence, MPs are considered an emerging contaminant of environmental concern. The separation and quantitation of MPs from freshwater sediments is a challenging and critical i...

Groundwater is an important source of freshwater worldwide; however, it could include severe contaminants such as lead, arsenic, and nitrate threatening human health. This study examined the practicability of a pilot-scale integrated electrodialysis (ED) and electrolysis (EL) system for groundwater treatment in Ho Chi Minh City, Vietnam. Under circ...

One of the advanced oxidative processes is gamma irradiation, an efficient technique for removing pesticides and pharmaceutical products. Radiolytic degradation leads to free radical's formation, which facilitates molecular lesion and breaks the chemical bonds. The use of pharmaceutical compounds, such as hydroxychloroquine (HCQ), is increasing now...

In this study, electro-Fenton (EF) was employed for the removal of tricyclazole (TC) and total organic carbon (TOC) in real pesticide wastewater (RPW). The central composite design (CCD) with three parameters, that is, current density, Fe2+ concentration, and electrolysis time, has been conducted to predict the TOC and TC removal efficiency. The hi...

In this paper, a cold plasma process was employed for the removal of amoxicillin (AM) and total organic carbon (TOC) from real hospital wastewater in Vietnam via the statistical design of a central composite design (CCD), with three factors of initial pH, applied voltage, and reaction time, respectively. Under optimal treatment conditions of a reac...

In this study, the life trait responses of a model toxicity zooplankton, Daphnia magna, to single di-2-ethylhexyl phthalate (DEHP) and its mixture with Pb and Cd at environmentally relevant concentrations (50 µg L–1 for DEHP, 4.2 µg L–1 for Pb, and 5.4 µg L–1 for Cd) were investigated. The DEHP did not impact the survival rate, maturation and repro...

A study on the α-glucosidase inhibitory activity of 40 kinds of vegetables, tubers, and fruits found in the An Giang province was conducted. The results indicated that all 40 extracted samples displayed α-glucosidase inhibitory activity at a concentration of 250 μg ml-1, 36 extracted samples showed an inhibition rate greater than 50% at 250 μg ml-1...

In this study, Vietnamese spent cofee ground (SCG) were subjected to produce biodiesel for fuel application. The extraction processes were conducted with three organic solvents, i.e., hexane, petroleum ether and dimethyl ether. The extraction oil seems to be favored in hexane solvent (17.06%) as compared with petroleum ether (16.62%) and dimethyl e...

This study investigated the removal of atrazine from an aqueous solution upon electron beam irradiation from an electron accelerator. Electron beam irradiation could be considered an advanced oxidation process (AOP); these techniques have been recently applied to remove a lot of contaminants in wastewater streams. Atrazine concentrations in aqueous...

The present study focused on investigating the contamination and risk assessment for 16 met- als in street dust fromHa Noi highway, Ho Chi Minh City. The results indicated that the concentrations of metals (mg/kg) were found, in decreasing order, to be Ti (676.3 ± 155.4) > Zn (519.2 ± 318.9) >Mn (426.6 ±113.1) > Cu (144.7 ± 61.5) > Cr (81.4 ± 22.6)...