Nguyen Thi Kim Phuong

Institute of Chemical Technology, Vietnam academy of Science and Technology, Ho Chi Minh

A superior heterojunction of HC-ZnBi-LDO was synthesized in two steps, namely hydrothermal carbonization, followed by co-precipitation. The 2% HC-ZnBi-LDO heterojunction photocatalysts could degrade over 90.8% of 30 mg/L 2,4-dichlorophenoxyacetic acid (2,4-D) using 1.0 g/L of the catalyst after 135 min of visible light exposure at pH 4. The activit...

Recently, the development of advanced materials that can respond to the wound environment has attracted great interest in the field of controlled-release formulations. The most important aspect of these advanced materials is to maintain the concentration of the therapeutic agent in the target tissues at a desired value for as long as possible, ther...

Heterojunction structures have attracted considerable attention for enhancing electron migration across interfaces. In this report, ZnBi2O4–ZnS(12%) heterojunction photocatalysts was found to be capable of degrading over 94% of indigo carmine in a 15 mg/L solution within 90 min of visible light irradiation at a catalytic dose of 1.0 g/L and pH 4. F...

The aim of this study was to assess the glycogen content in the muscle and liver tissues of the climbing perch (Anabas testudineus) exposed to sublethal concentrations of Cd and Pb over 28 days of exposure and 14 days of depuration. Muscle and liver glycogen levels in A. testudineus after Pb or Cd treatment were significantly lower (p < 0.05) than...

This study aimed to evaluate the health risks of cadmium (Cd), lead (Pb), inorganic arsenic (As), and nitrate exposure through the consumption of bivalves and vegetables collected from local markets in Ho Chi Minh City. The present study analyzed four favorite bivalve species (Meretrix lyrate; Perna viridis; Anadara subcrenata; Anadara granosa) for...

Herein, a novel colorimeter based on the Beer-Lambert law was designed for detection of environmental pollutants in water with a high precision, simple, and miniaturized device using a tetracycline-Eu³⁺ complex, cadmium reduction, diazotization, 1,10-phenanthroline, and periodate oxidation. The newly developed colorimeter could detect many environm...

Novel highly visible-light active 1.0rGO–ZnBi2O4–Bi2S3 heterostructure photocatalysts with various weight percentages of Bi2S3 were successfully synthesized. First, the 1.0rGO–ZnBi2O4 catalyst was synthesized by a simple two-step oxidation–reduction and co-precipitation methods, followed by heating at 450 °C. Then, 1.0rGO–ZnBi2O4 was hydrothermally...

A new highly efficient rGO/ZnBi2O4 hybrid catalyst has been successfully synthesized through oxidation-reduction and co-precipitation methods, followed by heating at 450 °C. The obtained rGO/ZnBi2O4 catalyst was characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), Fourier-trans...

BACKGROUND Photodegradation through an advanced oxidation process gives promising prospects for environmental protection. Although titanium dioxide (TiO2) is considered as an excellent photonic material candidate, however, the band gap of TiO2 is 3.2 eV which limits its effective applications. Various approaches have been developed for enhancing th...

A novel ZnBi2O4/rGO hybrid catalysts had been synthesized by a simple precipitation method. The crystallinity, structural, and morphological features were studied by XRD, FE-SEM and UV-Vis diffused reflectance techniques. The photocatalytic activity of ZnBi2O4/rGO catalysts were evaluated by degradation of Indigo Carmine dye under visible-light irr...

In order to make long-lived photoexcited charges for efficient catalytic photodegradation, rare earth elements are often incorporated into semiconductors. We studied the doping effect on photodegradation efficiency of Bi2WO6 samples with europium ions which were successfully synthesized by a simple one-step. The prepared catalyst was characterized...

Indigo Carmine in aqueous solution was effectively degraded using ZnO-Bi2O3/Graphitic Carbon Nitride heterojunction structure by visible light/H2O2 system. The mechanism of photocatalytic degradation of Indigo carmine shows the responsible species for the degradation of Indigo carmine in the ZnO-Bi2O3-xC3N4/H2O2/visible light system (x = 0, 1, 2, a...

The influence of ammonia on TiO2‐MgFe2O4 catalysts synthesized via a hydrolysis and co‐precipitation, followed by calcination at 500°C, was studied. Two different catalysts, TiO2‐MgFe2O4 (Am) and TiO2‐MgFe2O4 (W), were prepared using Ti‐precursors, which were synthesized by the hydrolysis of Ti‐butoxide with and without ammonia. The resulting TiO2‐...

Novel highly active visible-light photocatalysts in the form of zinc bismuth oxide (ZnBi2O4) and graphite hybrid composites were prepared by coupling via a co-precipitation method followed by calcination at 450 °C. The as-prepared ZnBi2O4-graphite hybrid composites were tested for the degradation of rhodamine B (RhB) solutions under visible-light i...

Novel highly visible‐light active ZnBi2O4‐Bi2S3 photocatalysts with various weight percentages of Bi2S3 have been synthesized by a simple two‐step co‐precipitation and hydrothermal method. The efficacy of the as‐prepared ZnBi2O4‐Bi2S3 composites was evaluated for the degradation of Indigo carmine in aqueous solutions under visible light irradiation...

The accumulation, elimination and effect of heavy metals on plasma cortisol levels in Oreochromis sp. were studied in the exposure and recovery phases. In the exposure phase, the mean rate of accumulation in the tissues was in the order gill > liver > muscle for Pb exposure and muscle > liver > gill for As exposure. In the recovery phase, the order...

The herbicide glyphosate (GLY) or 2,4-dichlorophenoxyacetic acids (2,4D) was intercalated in the interlayer region of a Zn-Al-layered double hydroxide (LDH) to obtain LDH-GLY or the LDH-2,4D hybrid composite because of its controlled release. Compared to the physically mixed herbicides, the LDH-herbicide hybrid composite displayed slow-release prop...

A novel TiO2@MgO-Fe2O3 core-shell structure has been synthesized via a hydrolysis and co-precipitation method followed by calcination at 500 °C and has proven to be an efficient photocatalyst. The obtained TiO2@MgO-Fe2O3 core-shell was characterized by scanning electron microscopy, X-ray diffraction, and UV-Vis diffused reflectance techniques. Its...

Novel mixed-metal oxides/graphitic carbon nitride composites that are coupled using co-precipitation are described by Nguyen Thi Kim Phuong, Yong-Ill Lee, and co-workers in article number 1700128. The electronic coupling between zinc oxide-zinc bismuth oxide and graphitic carbon nitride exhibits an excellent photocatalytic activity under visible li...

The accumulation, elimination and effect of heavy metals on plasma cortisol levels in Oreochromis sp. were studied in the exposure and recovery phases. In the exposure phase, the mean rate of accumulation in the tissues was in the order gill > liver > muscle for Pb exposure and muscle > liver > gill for As exposure. In the recovery phase, the order...

Novel photocatalysts in the form of zinc oxide-zinc bismuth oxide (mixed-metal oxide [MMO]) and graphitic carbon nitride (CN) hybrid composites are developed via a co-precipitation method followed by calcination at 520 °C. The as-prepared MMO-CN hybrid composites are evaluated on the basis of their photocatalytic activities for Rhodamine B (RhB) in...

The accumulation and elimination of Cd on Oreochromis sp. tissues were studied in exposure phase and recovery phase. In the exposure phase, the mean rate of Cd accumulation in the Oreochromis sp. tissues was in the order liver >> gill >> muscle. Cd accumulation in these tissues increased with increases in Cd concentrations in the water or as time p...

The size-dependent properties, such as broad excitation spectra, narrow, tunable and symmetric emission spectra and high resistance to photo-bleaching of optical quantum dots lead them to be a promising candidate for optosensing a diverse targets including metal ions, drugs, biochemical compounds, and pathogenic bacteria etc.. Here, we report the r...

The calcined layered double hydroxides (cLDHs) Ti-doped and undoped MgFe for this study were prepared by co-precipitation method followed by calcination at 500 °C. The as-prepared samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer Emmett Teller (BET) and UV-Vis diffuse reflectance spectrum (DRS) tech...

In the water treatment field, powder form of layered double hydroxides (LDHs) has wide applications in adsorptions. However, its applications are limited because of low hydraulic conductivity. Here, LDH-alginate/polyvinyl alcohol (PVA) beads were fabricated by entrapment of the Mg-Al LDH powder into alginate/PVA beads. The obtained Mg-Al LDH-algina...

Mg−Al LDH-alginate/PVA beads were fabricated by entrapment of the Mg−Al LDH powder into alginate/PVA beads. This study has demonstrated the potential use of this technique in environmental remediation using nitrate as a model contaminant. The obtained Mg−Al LDH-alginate/PVA beads were characterized by X-ray diffraction and scan electron microscopy....

This study was undertaken to determine levels of contamination of toxic metals consumed shellfish products from Can Gio coastline located in southeast of Ho Chi Minh City, Vietnam. Concentrations of As, Cd, Pb, Cr and Mn were determined in edible tissues of Mud Clam (Geloina coaxans), Clam (Meretrix lyrata), Subcrenata (Anadara subcrenata), Blood c...

In the water treatment field, activated carbons (ACs) have wide applications in adsorptions. However, the applications are limited by difficulties encountered in separation and regeneration processes. Here, activated carbon/Fe(3)O(4) nanoparticle composites, which combine the adsorption features of powdered activated carbon (PAC) with the magnetic...

This study was conducted to assess the potential of river sediment for amendment of agricultural land with respect to heavy metal mobilization. The mobility and concentration of bioavailable heavy metal containing in the sediment were evaluated with the use of DTPA (diethylenetriamine pentaacetic acid) extraction techniques. Sum of metals in exchan...