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Sorption of Pb(II), Cd(II), and Ni(II) Toxic Metal Ions by Alginate-Bentonite

Journal of Environmental Protection 2013年第1期4卷 51-55页

作者： teoh wah tzu Takuma Tsuritani Kazunori Sato Department of Environmental Engineering Nagaoka University of Technology Nagaoka Japan

The sorption of Pb(II), Cd(II), and Ni(II) toxic metal ions from aqueous solution by composite alginate-bentonite and alginate was investigated. The affinity and sorption capacity of the toxic metal ions for both type of samples were evaluated. The Langmuir maximum sorption capacity for each toxic metal ion increased for alginate-bentonite as compared to alginate. However, affinity for toxic metal ion remained unchanged for both alginate-bentonite and alginate in the order of Pb(II) > Cd(II) > Ni(II). Alginate-bentonite also shortens the duration required for complete sorption. Elementary mapping analysis depicts the gradient diffusion of toxic metal ions into the centre of alginate-bentonite beads indicated that sorption was contributed by surface adsorption and diffusion.

关键词： Toxic metals Alginate Bentonite Wastewater

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Lead Ion Uptake By Sodium Alginate And Calcium Alginate Film:A Comparison Study

Lead Ion Uptake By Sodium Alginate And Calcium Alginate Film...

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2012 International Congress on Informatics,Environment,Energy and Applications(IEEA 2012)

作者： Armando Gomez Kazimierz Wrobel Katarzyna Wrobel Sato Kazunori teoh wah tzu Department of Chemistry University of GuanajuatoL.de Retana No.5Guanajuato 36000Mexico Department of Environmental Engineering Nagaoka University of TechnologyNagaokaNiigata 9402188Japan

Lead ion (Pb(II)) uptake from aqueous solution by two different alginate compounds was investigated. Sodium alginate (Na-Alg) and calcium alginate (Ca-Alg) films were successfully fabricated from the commercially available sodium alginate powder. The Pb(II) uptake performance by Na-Alg and CaAlg films was evaluated against time in a 10 mM Pb(II) solution’s batch sorption system. Ca-Alg film was consistently showing a better Pb(II) uptake performance as compared to Na-Alg film within the investigated duration. Further evaluation on Ca-Alg film was carried out at lower Pb(II) concentrations, i.e. 1 mM and 0.1 mM, the Ca-Alg film showed the best performance in 0.1 mM Pb(II) solution at a uptake rate higher than 98%. The Pb(II) uptake performance of Ca-Alg film was also compared with that of the conventionally fabricated Ca-Alg beads. This result indicates that with the same amount of Ca-Alg used, the film shows approximately three time better Pb(II) uptake performance compared to the beads. The results reported herein indicates that Ca-Alg compound is an effective and efficient biosorbent, furthermore the Pb(II) uptake performance is influenced by the sample fabrication method as well, i.e. film versus bead, which contributed to the overall surface area.

关键词： alginate films lead uptake sorption

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Awareness and knowledge of hepatitis B infection and prevention and the use of hepatitis B vaccination in the Hong Kong adult Chinese population

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Chinese Medical Journal 2012年第3期125卷 422-427页

作者： wah, Chung Pui Hung, Suen Sik Ka, Chan Oi Hsi, Lao tzu Yeung, Leung Tak Chinese Univ Hong Kong Prince Wales Hosp Dept Obstet & Gynecol Shatin Hong Kong Peoples R China

Background Hepatitis B virus （HBV） infection remains a global public health problem and it is an important cause of acute,chronic and fulminant hepatitis,liver cirrhosis and hepatocellular *** prevalence of HBV infection in Hong Kong over the past decade remained unchanged at 10%,despite the implementation of universal neonatal and availability of adult *** suspect that the current state of affairs is attributable to inadequate awareness and knowledge of HBV transmission and prevention in the general population,resulting in a low rate of uptake of HBV vaccination by the lay ***,we have embarked in this study to evaluate the awareness and knowledge on HBV infection in our local Chinese population,their attitude on the prevention of horizontal transmission of HBV,and the use of HBV vaccination,especially in those who were born before the era of universal neonatal *** The factors associated with HBV screening,vaccination uptake,and knowledge were examined in a face-to-face questionnaire survey on a group of adult Chinese in Hong *** Within this group,14% was considered to have good knowledge for HBV infection,and 26% had HBV ***,occupation,having children,and family monthly income,are independent factors associated with *** This study suggests insufficient public awareness of HBV infection in the Hong Kong Adult Chinese population.

关键词： hepatitis B infection prevention awareness Hong Kong

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