http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ultraviolet Fluorescence-Based Quantitative Detection of Polycyclic Aromatic Hydrocarbons
Vien Thi Tran,석주선,윤인준,주형규 한국바이오칩학회 2021 BioChip Journal Vol.15 No.4
Polycyclic aromatic hydrocarbons (PAHs), mainly produced by incomplete combustion of organic materials in ship engines as well as in industry, has been considered one of the major hazardous substances in water-based ecotoxicology. Its realtime quantitative monitoring has thus been becoming increasingly important, particularly that with ultrahigh sensitivity. In this work, we demonstrated an ultraviolet (UV) fluorescence with an optical feedback for the highly sensitive quantitative detection of polycyclic aromatic hydrocarbons (PAHs). A fluorescence sensor is presented owing to its intrinsic fluorescence properties in the UV spectral range. This sensor, where an optical feedback is introduced with an aluminum film coated on a sensor chip, enhances fluorescence via increasing efficiency of both dye excitation and emission collection. The experimental results include the linear response of the UV fluorescent signal-to-concentration over a broad concentration range, with the signal-to-concentration slope representing a threefold enhancement over conventional fluorescence devices. The sensor device features such characteristics as the limit of detection (LOD) of 0.49 part per billion (ppb), signal accuracy > 92.5%, coefficient of variation < 5% (for signal reproducibility), the detection time of 3 s, and temperature error < 5%. Upon miniaturization of the format, the device presented may find an use for ultrasensitive in situ detection of PAHs in water.
Vo, Vien,Nguyen Thi, Xuan Dieu,Jin, Ying-Shi,Ly Thi, Giang,Nguyen, Tien Trung,Duong, Tuan Quang,Kim, Sung-Jin Elsevier 2017 Chemical physics letters Vol.674 No.-
<P>Tin dioxide (SnO2) nanosheets/graphitic carbon nitride (g-C3N4) composite was prepared by a hydrothermal method using mercapto acetic acid as the morphology directing agent in an acidic medium. The as obtained composite was characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscope, and X-ray photoelectron spectroscopy; the results of this study show that in the composite, SnO2 nanosheets with a thickness in the range similar to 20-25 nm dispersed well on the g-C3N4. The lithium storage capability of the composite was investigated. The cycling performance of the composite was improved and is believed to be attributed by the presence of g-C3N4 support. (C) 2017 Elsevier B.V. All rights reserved.</P>
Hoang Van Hung,Chu Thi Hong Huyen,Nguyen Thi Dong,Nguyen Thi Hong Vien,Nguyen Thu Huyen,Luu Thi Cuc,Van Huu Tap,Nguyen Hoang,Duong Dinh Tuan,Nguyen Van Huu Luong 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.5
In this study, heterogeneous catalytic ozonation using fl y ash (FA) modifi ed ZnO nanoparticles to the decolorization of acid orange II (AOII) was studied. The combination of ZnO and fl y ash via an incipient wetness impregnation method to form ZOFA composites created a synergistic eff ect that led to effi cient catalytic ozonation activity towards AOII degradation and decolorization compared with individual ozonation processes. From the experimental results, ZOFA composite with the optimal weight ratio between ZnO NPs and FA was 20 wt% (denoted as ZOFA-20) that exhibited outstanding catalytic ozonation activity. Moreover, through other investigations including initial pH conditions and catalyst dosage, AOII could be eff ectively and optimally eliminated by 0.5 g of ZOFA-20 with an initial pH value of 11. The corresponding k value was measured as 0.248 min −1 with a maximum TOC removal content of 77.27%. Besides, ZOFA-20 could show high catalytic ozonation activity even at highly concentrated AOII concentrations while it could also retain its excellent stability and reusability over 5 continuous AOII removal cycles. From the experimental and electron paramagnetic resonance (EPR) results, hydroxyl radical ( · OH) was the main active species during the catalytic ozonation of AOII. The present study provides a promising approach to prepare novel composite-based fl y ash that would be applicable for removing azo dye and other dye pollutants in water via a catalytic ozonation strategy.
Chemical components from the leaves of Ardisia insularis and their cytotoxic activity
Nguyen Thi Hong Van,김승현,Trinh Anh Vien,Phan Van Kiem,Chau Van Minh,Nguyen Xuan Nhiem,Pham Quoc Long,Luu Tuan Anh,김난영,박선주 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.11
One new oleanane triterpene glycoside, ardinsuloside(1), and twelve known compounds, demethoxybergenin(2), norbergenin (3), bergenin (4), 4-O-galloylbergenin(5), quercitrin (6), myricitrin (7), myricetin 3-O-(300-O-galloyl)-a-L-rhamnopyranoside (8), desmanthine-2 (9), epicatechin3-O-galloyl ester (10), 30-methoxyepicatechin 3-Ogalloylester (11), gallic acid (12), and methyl galloate (13)were isolated from the leaves of Ardisia insularis. Theirstructures were established on the basis of spectral and chemicalevidence, which were in agreement with those reportedin literature. The cytotoxic activities of these compounds wereevaluated on three cancer cell lines namely A-549 (humanlung cancer), HT-29 (Human colon adenocarcinoma), andOVCAR (human ovarian carcinoma). The results revealedthat compound 1 inhibited A-549, HT-29, and OVCAR celllines with IC50 values of 8.5 ± 1.2, 16.4 ± 3.1, and13.6 ± 2.4 lM, respectively. The remaining compoundshowed weak cytotoxic activity. This result indicated thatcompound 1 could be useful in the treatment of cancer disease.
Doan, An Tran,Thi, Xuan Dieu Nguyen,Nguyen, Phi Hung,Thi, Viet Nga Nguyen,Kim, Sung Jin,Vo, Vien Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.6
Graphitic g-$C_3N_4-WO_3$ composite was synthesized simply by decomposing melamine in the presence of $WO_3$ at $500^{\circ}C$. The obtained material was characterized by XRD, SEM, IR and XPS. The results showed that the as-prepared composite exhibits orthorhombic $WO_3$ phase coated by g-$C_3N_4$ and the g-$C_3N_4$ decomposed completely with N-doped $WO_3$ remaining at elevated calcination temperatures. The photocatalytic activity of the composite was evaluated by the photodegradation of methylene blue under visible light. An enhancement in photocatalytic activity for the graphitic g-$C_3N_4-WO_3$ composite compared to the conventional nitrogen-doped $WO_3$ was observed, which can be attributed to the presence of g-$C_3N_4$ in the material.
Graphitic g-C3N4-WO3 Composite: Synthesis and Photocatalytic Properties
An Tran Doan,Xuan Dieu Nguyen Thi,Phi Hung Nguyen,Viet Nga Nguyen Thi,김성진,Vien Vo 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.6
Graphitic g-C3N4-WO3 composite was synthesized simply by decomposing melamine in the presence of WO3 at 500 oC. The obtained material was characterized by XRD, SEM, IR and XPS. The results showed that the as-prepared composite exhibits orthorhombic WO3 phase coated by g-C3N4 and the g-C3N4 decomposed completely with N-doped WO3 remaining at elevated calcination temperatures. The photocatalytic activity of the composite was evaluated by the photodegradation of methylene blue under visible light. An enhancement in photocatalytic activity for the graphitic g-C3N4-WO3 composite compared to the conventional nitrogendoped WO3 was observed, which can be attributed to the presence of g-C3N4 in the material.
A Facile Synthesis of WS2/g-C3N4 Composites with Improved Photocatalytic Activity
Huu Ha Tran,Duy Huong Truong,Thanh Tam Truong,Thi Xuan Dieu Nguyen,Ying-Shi Jin,김성진,Vien Vo 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.8
Visible-light-driven photocatalysis has received considerable attention in the environmental treatment in recent years. In this paper, WS2/g-C3N4 composite photocatalysts with various contents of WS2 and g-C3N4 were synthesized by a facile method via heating the mixtures of tungstic acid and thiourea, and denoted as nWCN, where n is weight ratio of thiourea to tungstic acid. The composites were characterized by XRD, SEM, EDS, TEM, IR, Raman spectroscopy, XPS, TGA, and UV?vis DRS. The characterizations reveal that the composites contain WS2 nanosheets coated by g-C3N4 and the relative content of WS2 in the composites decreases with increasing amount of thiourea in the reaction mixtures. All the composites exhibited the better photocatalytic activity in degradation of methylene blue in aqueous solution than the single components, WS2, and g-C3N4. Among them, 7WCN sample performed the highest activity. A synergistic effect between WS2 and g-C3N4 in photocatalytic activity for the composites was observed.