GREEN AND RAPID SYNTHESIS OF BIOCOMPATIBLE GOLD AND SILVER NANOPARTICLES USING FRUIT JUICES, GREEN TEA AND COFFEE A COMPARATIVE AND SYSTEMATIC STUDY
Published In: 2ND INTERNATIONAL CONFERENCE ON ADVANCES IN BIO-INFORMATICS AND ENVIRONMENTAL ENGINEERING
Author(s): ALEJANDRO ZUNIGA , ARYANE TOFANELLO , CARLOS E. DE CASTRO , ERICA G. A. MIRANDA , FERNANDO C. GIACOMELLI , ISELI L. NANTES , JULIANA C. ARAUJO-CHAVES
Abstract: A facile, rapid and green synthesis of gold and silver nanoparticles (GNPs and SNPs) using juice of different fruits as reducing and stabilizing agent is reported. Seven different fruits were used in the comparative study with green tea and coffee: lemon, melon, pineapple, banana, orange and tomato. The efficiency of the fruits for the synthesis and stabilization of metallic nanoparticles was compared at pH 3, 7 and 10. The effect of the buffer agent, phosphate and HEPES, was also studied. The early analysis of NP formation was done by observing the color change of the samples. Alkaline pH was favorable for the synthesis of metallic NPs at all the tested conditions. Green tea and coffee were the most efficient agents for the synthesis of GNPs and SNPs. The formation of the GNPs was evident only few seconds after the addition of gold salt solution in the extracts. The most efficient fruits for GNP synthesis were lemon, banana and orange. In the presence of these fruits the formation of
- Publication Date: 19-Apr-2015
- DOI: 10.15224/978-1-63248-043-9-103
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REGENERATION PERFORMANCE AND CARBON CONSUMPTION OF SEMI-COKE AND ACTIVATED COKE FOR SO2 AND NO REMOVAL
Published In: 2ND INTERNATIONAL CONFERENCE ON ADVANCES IN BIO-INFORMATICS AND ENVIRONMENTAL ENGINEERING
Author(s): FENG QI , SONG DING , TINGYU ZHU , YANGYANG GUO
Abstract: To decrease the operating cost of flue gas purification technologies based on carbon-based materials, the adsorption and desorption performances of low-price semi-coke and activated coke were compared for SO2 and NO removal in a simulated flue gas. The functional groups of two adsorbents before and after regeneration were determined by a Fourier transform infrared (FTIR) spectrometer, and were quantitatively tested using temperature programmed desorption (TPD) coupled with FTIR and acid-base titration. The results show that semicoke has higher adsorption amounts (16.2% for SO2 and 38.6% for NO) than activated coke because of its richer basic functional groups and lactone. After regeneration, the adsorption performances of semi-coke decrease because the active functional groups decreased and the micropores increased. Semi-coke has a better regeneration performance than activated coke. Semi-coke has a larger SO2 recovery of 7.2% and a smaller carbon consumption of 12% than activated coke
- Publication Date: 19-Apr-2015
- DOI: 10.15224/978-1-63248-043-9-104
- Views: 0
- Downloads: 0