成果報告書詳細
管理番号20120000001100
タイトル*平成23年度中間年報 省水型・環境調和型水循環プロジェクト 水循環要素技術研究開発 革新的膜分離技術の開発 「RO膜の開発」(H21-H24)
公開日2013/4/27
報告書年度2009 - 2012
委託先名東レ株式会社
プロジェクト番号P09011
部署名環境部
和文要約(1)有機無機ハイブリッド水処理分離膜の研究開発
モジュール試作に必要な自動ラボ製膜機での膜形成技術の確立と小型50cmモジュールの試作、さらなる性能向上に向けた分子設計を実施した。
(2)精密なサブナノ空孔を有するポリマーを利用した水処理分離膜の研究開発
昨年度の分析結果を元に溶質透過機構の解明および分離選択性向上のための分子設計を進めた。
価数の低いアニオンほど細孔部位との相互作用しやすく、膜中での拡散速度が低いこと、すなわち除去率が高くなることが示唆された。この結果を元に、細孔部位を形成する分子構造に着目した分子設計を行い、新たな複合膜を作製したところ、分離選択性の変化が確認された。
(3)ナノ多孔粒子/高分子複合水処理分離膜の研究開発
さらなる性能向上へ向け、ポリマーとナノ微粒子との親和性に着目した構造設計を進めた。
ポリマーとして酢酸セルロースを用い、表面修飾したナノ微粒子を添加して非溶媒誘起相分離法により複合平膜を作製した。膜構造をSEMで分析したところ、表面修飾したナノ微粒子は分散性およびポリマーとの親和性が高いために、表面修飾しないナノ微粒子を用いた膜と比べて微粒子の凝集抑制およびポリマー/微粒子間の空隙縮小に効果があることが確認された。
英文要約Title: Project on Water-saving Recycling Systems. Research and Development of Elemental Technology for Water-Recycling. Advanced Material RO Membrane on Innovative Membrane Separation Technology. (FY2009 - FY2012) FY2011 Annual Report: 1)
Organic-inorganic hybrid membranes: The results are follows: a) A proto-type spiral module was successfully fabricated through the investigation for the establishment of winding method. b) As a result of a trial run of the equipment for long-term operation test, good controllability of chlorine concentration, temperature and pH was confirmed. We are going to evaluate the practicality of the membrane in the next fiscal year. c) We also got the clue to further performance enhancement by achieving the acceleration of the polymerization reaction between hydrophilic monomers and hydrophobic monomers. The development of this new method for large scale membrane and module is under way.: 2) Membranes based on polymers with sub-nanometer pores: a) Solute transport mechanism through thin-film composite membranes were analyzed, and it was found separation selectivity was related to interactions between ions and pore structure. b) A new RO membrane with another molecule designed on the basis of the analysis was prepared, and the reliability of the proposed mechanism was confirmed.: 3) Porous nano-particles/polymer composite membranes for water treatment: The investigation on the design of membrane structure whjch is focused on the affinity between polymer and nano-particles was carried out in order to improve salt rejection performance. Various polymer membranes with surface-modified nano-particles were prepared. The analysis of cross section structure by SEM showed that the modified membranes had narrower gap between polymer and nano-particles than that of the polymer membrane with non-modified nano-particles as well as inhibition of aggregation of the nano-particles. Consequently, the performance of water productivity and salt rejection were improved by the modified membranes, however, they have not been satisfied as a RO membrane yet. In the next fiscal year, the further adjustment of the affinity will be conducted to obtain appropriate membrane structure.
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