Development of New Adsorbents for Removal and Recovery of Heavy Metals

2015 Fiscal Year Final Research Report

• Project/Area Number: 25340083
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Modeling and technologies for environmental conservation and remediation
• Research Institution: Niigata University
• Principal Investigator: KANO NAOKI 新潟大学, 自然科学系, 准教授 (00272857)
• Co-Investigator(Kenkyū-buntansha): IMAIZUMI Hiroshi 新潟大学, 自然科学系, 教授 (80126391)
• Co-Investigator(Renkei-kenkyūsha): KIM Hee-Joon 新潟大学, 自然科学系, 教授 (50242045) ; YAMAUCHI Takeshi 新潟大学, 自然科学系, 教授 (90262477)
• Research Collaborator: ZHENG Yong-jie チチハル大学, 化学&化学工程学院, 教授
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: バイオマス / 木炭 / キトサン / 有機-無機ハイブリッド材料 / 重金属 / 吸着剤

Outline of Final Research Achievements

Adsorption of heavy metals from aqueous solution onto natural materials based on some biomass was investigated to evaluate the efficiency of biomass as sorbent for heavy metals. Natural materials used in this work are Yukitsubaki carbon modified with nitric acid (10% and 30%) and chitosan. Furthermore, zeolite/chitosan hybrid composite (ZCHC) was prepared with sol-gel method by mixing zeolite and chitosan. The surface properties of these materials were characterized by using SEM and FT-IR. Furthermore, the sorption mechanism of heavy metals by these materials was investigated by applying some adsorption isotherms or kinetic models.
Consequently, the following matters have been mainly obtained: (1) Adsorption capacity of heavy metals by carbon was increased after the modification with HNO3. (2) Langmuir isotherm model better fits the experimental data than the Freundlich isotherm. (3) The rates of adsorption were found to conform to pseudo-second order kinetics.

Free Research Field

環境分析，環境浄化