Development of phosphorus and nitrogen simultaneous removal material by compositing zeolite and hydrotalcite

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K00601
• 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: Kyoto Institute of Technology
• Principal Investigator: Shiomi Haruhisa 京都工芸繊維大学, 材料化学系, 准教授 (60215952)
• Co-Investigator(Kenkyū-buntansha): 塩野 剛司 京都工芸繊維大学, 材料化学系, 准教授 (30178850)
• Research Collaborator: Agario Azusa ; Anegawa Rio ; Fujii Yuugo
• Project Period (FY): 2016-10-21 – 2019-03-31
• Keywords: ゼオライト / ハイドロタルサイト / リン除去 / 重金属イオン除去 / 水質浄化材

Outline of Final Research Achievements

We prepared composites of zeolite-hydrotalcite and studied simultaneous removal of cation and anion. In this study, silica fume, sodium aluminate and hydrotalcite were used to prepare a composite solidified body with a zeolite/hydrotalcite volume ratio of 5/5, 6/4, 7/3, 1/0. The resulting composites were classified into 3.0-2.0 mm, 2.0-1.0 mm and 1.0-0.5 mm, and their removal ability of phosphate ion and lead ion was examined. The removal experiment was performed with 50 ppm and 40 ppm of phosphorus concentration and lead ion concentration of the test solu-tion. The phosphate ion was removed by 60-70% after soaking for 24 hours. On the other hand, with lead ion, it was found that 60-80% of lead ion can be removed only by ion exchange of zeolite. Moreover, the smaller the particle size of the composite, the higher the removal rate of phosphate ion and lead ion.

Free Research Field

無機材料化学

Academic Significance and Societal Importance of the Research Achievements

ゼオライトの合成とハイドロタルサイトとの複合化を同時に行う固化法においては，イオン交換能を阻害するような夾雑物を含まないため高いイオン交換能が期待できる.また，水酸化アルミニウムあるいはメタカオリンおよび水ガラスを用いたゼオライト固化体の合成方法は，水質浄化材の作製だけではなく，調湿用建材，シックハウス症候群の原因物質等の各種吸着材の開発にも有効な手法である．なお，本申請では排水中のリン酸イオンおよび窒素の除去を対象にしているが，ハイドロタルサイトを用いた枯渇危惧資源であるリンの回収，ゼオライトによる有害重金属イオンの除去に対しても効果が期待できるなど，本研究の波及効果と意義は大きい．