Iranian Journal of Materials Science and Engineering

en Catalytic Oxidation of Nitrite to Nitrate in Aquas Solution by Carbonate-Activated Charcoal گروه بایومواد Biomaterials Research Paper Research Paper Activated charcoals were prepared by activation with 600 W microwave irradiation in combination with pretreatments of tamarind wood derived charcoal in boiling mixtures with NaOH (1 g : 0 g - 1 g: 0.12 g). The samples were characterized by FTIR, XRD, SEM-EDS, and BET, and used for catalytic nitrite c oxidation under air atmosphere in the absence of light at 30°C, pH 6.5, and 120 rpm shanking for improved efficiency. The results show that the percent yields of tamarind wood derived activated charcoals (ACCs) were 88.51% - 94.66 %. The main carbonate compounds of ACCs are present in the materials after activation. Na+ ions and water molecules could be inserted into the graphitic layers during pretreatment and efficiently effected surface cracking of ACCs by 600 W microwave irradiation. The surface cracklings and porosities of ACCs increased with increasing concentration of NaOH from 1 M to 3 M with optimum at 2 M NaOH. The final products are mesopore materials containing macro and meso hole channels. It was found that the nitrite conversions exhibit high reaction rates and are completed within 20 min. The reactions proceed via catalytic oxidations and their rates increase with increasing concentrations of NaOH activation, while nitrite conversions via the disproportionation reaction were inhibited.   Microwave irradiation,Sodium hydroxide,Activated charcoal,Catalytic oxidation,Nitrite 0 0 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-5283-4&slc_lang=en&sid=1 Sumrit Mopoung sumritm@nu.ac.th 1800319475328460022151 1800319475328460022151 Yes Chemistry department, Faculty of Science, Naresuan University, Thailand. Rinlaphat Thanakulwaranon rinlaphatt63@nu.ac.th 1800319475328460022152 1800319475328460022152 No Chemistry department, Faculty of Science, Naresuan University, Thailand.