Comparative Adsorption of Methylene Blue from Aqueous Solution onto Activated CarbonBased on Different Modifiers

• Main Authors: Jargalmaa Lkhagvajav, 李佳格
• Other Authors: KAO, CHAO-LANG
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/buat5u

碩士 === 國立勤益科技大學 === 化工與材料工程系 === 107 === In a world where demands for freshwater are ever growing, and where limited water resources are increasingly stressed by over-abstraction, pollution and climate change, neglecting the opportunities arising from improved wastewater management is nothing less than unthinkable. It is estimated that well over 80 percent of wastewater worldwide (over 95 per cent in some developing countries) is released into the environment without treatment. With rising water scarcity in many regions, this is changing, and we see increasing recognition of the importance of wastewater collection, treatment and reuse. The 2017 World Water Development Report shows that improved wastewater management is as much about reducing pollution at the source, as removing contaminants from wastewater flows, reusing reclaimed water and recovering useful by-products. Waste water recycling is one of the most sensible and winning options for promoting water sufficiency and it can range from simple home methods to sophisticated industrial wastewater filtration systems. The aim of the present research is to removal of methylene blue by one of the physical treatment method of adsorption from industrial wastewater. In this research, a carbon adsorbent material had been obtained by carbonization and activation of the waste cation-exchange resin. Activated carbon (AC) is a very well known material for adsorption of dye products from wastewater. However one of the disadvantage of AC adsorbent material is high cost. Therefore, In this study used waste ion-exchange resin to produce carbon adsorbent material. Chemical activation of the carbon adsorbent material, using nitric acid as dehydrating agent, is adopted for activated carbon preparation and main process parameters (such as acid concentration, and impregnation ratio) are varied to optimize the best conditions. The activated carbon prepared under the optimal conditions is then fully characterized considering its adsorption properties as well as its chemical structure and morphology. The results show that the most efficient adsorbent is that obtained under the following optimal conditions: an acid concentration equal to 5M HNO3, and carbonization temperature of 500 ℃. 0.5 g of AC modified with 5M concentration of HNO3 showed 99.6% MB removal efficiency after 1h treatment process. And concentration of MB was 30 ppm. Langmuir and Freundlich isotherm regression constant R2=0.87 and R2=0.88 proved that adsorption of MB by AC modified by 5M concentration of HNO3 was favorable sorption process.