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Tran L.,South China University of Technology | Tran L.,QuangBinh University | Wu P.-X.,South China University of Technology | Yang L.,South China University of Technology | Zhu Y.-J.,South China University of Technology
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2015

In this study, raw vermiculite has been modified by 2-aminoethanethiol (MEA) to obtain organo-vermiculite as adsorbent for the removal of silver ions in aqueous solution. The physicochemical properties of the raw and modified vermiculites were analyzed by Fourier transform infrared (FTIR) spectroscopy, thermogravimetry-differential scanning calorimetry (TG-DSC) and BET analysis, which indicated that MEA was successfully grafted onto the vermiculite. Additionally, batch adsorption experiments involving initial pH, adsorbent dosage, time and temperature demonstrated that the adsorption capacity of Ag onto MEA-VER was improved highly compared with that of raw vermiculite. The optimum adsorbent dosage was 2.0 g/L, the adsorbents presented a high removal efficiency of Ag+ in a wide range of initial pH values (6-12). The kinetics studies showed that the adsorption process was described well with pseudo-second-order model and the equilibrium was achieved at about 200 min of contact time. The adsorption isotherm of Ag+ onto vermiculites fitted the Langmuir model well. All these results indicated that the adsorption process onto vermiculites was taken place mainly by coordination and electrostatic adsorption. ©, 2015, Zhongguo Huanjing Kexue/China Environmental Science. All right reserved. Source


Tran L.,South China University of Technology | Tran L.,QuangBinh University | Wu P.,South China University of Technology | Yang L.,South China University of Technology | And 2 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

In this study, 2-aminoethanethiol (MEA) modified vermiculite was prepared as the adsorbent for removal of Hg2+ in aqueous solution. The characteristics of the obtained organo-vermiculite were determined by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, BET analysis and zeta potential analysis. XRD, FTIR, BET and zeta analysis results revealed that MEA was successfully grafted into the vermiculite. Moreover, batch experiments were conducted to examine the adsorption behaviors of Hg2+ onto MEA-VER and VER. The results indicated that the adsorption capacities of Hg2+ significantly increased after modification and adsorption equilibriums were achieved in 2 hours. The uptake of Hg2+ by the MEA-VER maintained high efficiencies in a wide pH range of 5.0~10.0. The adsorption of Hg2+ onto MEA-VER could be well described by Langmuir adsorption isotherm equation and Pseudo-second-order model. The mechanisms of the adsorption of Hg2+ onto organo-vermiculite were mainly coordination and charge adsorption. ©, 2015, Science Press. All right reserved. Source


Hien D.V.,QuangBinh University | Doolgindachbaporn S.,Khon Kaen University
Pakistan Journal of Biological Sciences | Year: 2011

This study aims to justify effects of niacin and folic acid in feed rations on growth and survival rate of the fish under in vitro conditions. A Completely Randomized Design (CRD) with four replications for Experiment I and three replications for Experiment II was used. Niacin (0, 5, 10, 20 and 40 mg kg-1) and folic acid (0, 2, 4, 6 and 8 mg kg-1) were used for Experiments I, and II, respectively. The cement tanks were used for Experiment I and fibre tanks for Experiment II. A static water system was used. Water temperature was maintained at a range from 26 to 30°C with pH values from 7.4 to 7.9. The results showed that niacin at a rate of 10 mg kg-1 feed ration gave significant differences on weight gained %, survival %, protein efficiency ratio, specific growth rate % and feed conversion ratio withmean values of 99.92,100,1.18, 5.77 and 1.35, respectively. Folic acid at a rate of 2 mg kg-1 gave significant differences on weight gained %, survival %, protein efficiency ratio, specific growth rate % and feed conversion ratio with mean values of 108.88, 100, 1.22, 6.13 and 1.43, respectively. Niacin at a rate of 10 and 2 mg kg-1 of folic acid were the best rates for in vitro culture of Green catfish. © Asian Network for Scientific Information. Source


Pham X.H.,QuangBinh University | Nguyen T.T.,Yeungnam University | Jung J.J.,Chung - Ang University | Hwang D.,Yeungnam University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014

The paper focuses on using geotagged resources from the social network service (SNS) for searching the famous places from keyword. We extend the HITS[9] algorithm in order to rank locations which are collected from geotagged resources on SNS. Our approach not only uses the similarity measurement between locations’tags for computing the value of locations but also calculate the term frequency of tags which occur in each location to modify the value of tags for ranking. We implement and show the experimental results with the set of locations from the geotagged resources. © Springer International Publishing Switzerland 2014. Source


Duong T.H.,QuangBinh University | Truong H.B.,University of Information Technology | Nguyen N.T.,Wroclaw University of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

The main aim of this research is to deal with enriching conceptual semantic by expanding local conceptual neighbor. The approach consists of two phases: neighbor enrichment phase and matching phase. The enrichment phase is based on analysis of the extension semantic the ontologies have. The extension we make use of in this work is generated an contextually expanded neighbor of each concept from external knowledge sources such as WordNet, ODP, and Wikimedia. Outputs of the enrichment phase are two sets of contextually expanded neighbors belonging to these two corresponding ontologies, respectively. The matching phase calculates similarities between these contextually expended neighbors, which yields decisions which concepts are to be matched. © 2012 Springer-Verlag. Source

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