本研究主要目的為探討親水化改質陶瓷過濾膜材表面特性對於奈米過濾分離次微米粒子性能之影響。本研究以陶瓷管作為基材，乾/濕式相轉換成型法使陶瓷管表面披附超薄高分子薄膜複合膜，並進一步親水化形成超親水性表層，提升對於微小粒子之分離能力。研究中以對水之接觸角測試，驗證複合膜對於親水特性改質之程度，並應用於奈米過濾分離高嶺土混和水溶液驗證其分離性能。
研究中發現親水化過程中，改質膜隨著浸泡於改質劑中接觸角逐漸朝向低角度改變，以6wt%聚丙烯腈製備之改質膜使用10%氫氧化鈉反應，在24小時後，接觸角會由42度降至10度。而最佳複合膜為4wt%聚丙烯腈、乾成膜時間1小時、改質時間24小時及改質劑NaOH濃度為10%，高嶺土混和液為1000ppm、濁度為950NTU、pH8進行分離次微米粒子試驗，在操作壓力0.2 kg/cm2下可長時間維持在8L/m2hr之透水量而濁度為0NTU
由研究結果顯示複合膜具有次微米顆粒分離性能並有較佳通透量穩定性。複合膜表面電荷斥力會因為操作壓力提高而降低對次微米顆粒排斥，進而降低出水品質，良好複合膜性能須對進料化學性、操作壓力及改質薄膜表面親水特性所形成之電荷排斥力取得平衡。 The purpose of this study is discussed the hydrophilic modification method on the coating polymer layer of composite ceramic membrane and their influence on the separation performance of sub-micro particle in the aqueous solution by membrane filtration. The various pore size of ceramic membrane was used as the support and the polymer coating layer was used the dry/wet phase inversion method to form a micro coating layer on the support. The chemical method was used to improve the hydrophilic properties of composite membrane and expected to improve the separation performance of sub-micro particle filtration. The contact angle of water of modified membranes decreased with increasing the concentration of NaOH. With 6wt% PAN coating, the contact angle of modified membranes is low than 10 degree after 24 hr hydration process.
It was concluded that a permeation flux higher than 8 L/m2 hr and completely particle rejection was obtained with the optimum modified condition under 0.2 kg/cm2 at room temperature. A high particle rejection rate can be achieved by hydration process of modified composite membranes but the loss of polar rejection effect decreased the separation performance due to the increasing in operation pressure. The optimization of hydration modified on membrane surface and operation condition control should be concerned in the sub micro particle separation process.
