Development efficient adsorption sites for removal of ionic pollutants from aqueous solution

2016 Fiscal Year Final Research Report

• Project/Area Number: 26340058
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental engineering and reduction of environmental burden
• Research Institution: Chiba University
• Principal Investigator: MACHIDA Motoi 千葉大学, 総合安全衛生管理機構, 教授 (30344964)
• Co-Investigator(Renkei-kenkyūsha): AMANO Yoshimasa 千葉大学, 大学院工学研究院, 助教 (40517976)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 炭素 / 吸着 / 水質浄化 / 重金属イオン / 陰イオン / 表面 / 4級窒素 / ヘテロ元素

Outline of Final Research Achievements

Modificaton of activated carbons (ACs) was carried out by oxidation and reduction to increase adsorption capacities of ionic pollutants from aqueous solutions. Sufficient amount of carboxyl groups could be efficiently intorduced to AC and ACF surface by the oxidation using ammomium persulfate solution at moderate temperature. Not only carboxyl groups but sulfo groups was present on AC surface. Much amount of Pb(II) and Cd(II) cationic ions can be successfully removed from water by the oxidized ACs. For anions, melamine sponge was employed as AC precursor and carbonized melamie AC (MAC) could adsorb nitrate about 2 times better than non-treated ACs. Furthermore, MAC was further treated with methyliodide to convert pyridine type N to quartenary N on the carbon surface and resultant AC (MAC-Q) exhibited better performance than before. Adsorption amount of nitrate was 0.6 mmol/g and changed by only 0.1 mmol/g when pH varied from 2 to 5, although it was declined by 0.3 mmol/g for MAC.

Free Research Field

環境化学，物理化学