用光催化剂纳米氧化锌和纳米二氧化铈改性制备与表征双极膜.docVIP

 Preparation and Characterization of Bipolar Membranes Modified by Photocatalyst Nano-ZnO and Nano-CeO2# 5 10 15 20 25 30 35 40 Ting-jin Zhou, Ri-yao Chen** (College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007) Abstract: Nano-ZnO-CeO2 coupled semiconductor was added into the chitosan(CS) anion exchange membrane layer to prepare the PVA-CMC/nano-ZnO-CeO2-CS (here, PVA: polyvinyl alcohol; CMC: carboxymethyl cellulose) bipolar membrane(BPM), and the prepared BPM was characterized by SEM, J-V characteristics, electronic universal testing machine, contact angle measurement and so on. Experimental results showed that nano-ZnO-CeO2 exhibited better photocatalytic property for water splitting at the interlayer of BPM than nano-ZnO or nano-CeO2, which could greatly reduce the membrane impedance of the BPM. Under the irradiation of high-pressure mercury lamps, the cell voltage of PVA-CMC/ nano-ZnO-CeO2-CS BPM decreased by 0.7V at the current density of 60mA/cm2, and the cell voltages of PVA-CMC/ nano-ZnO-CS BPM and PVA-CMC/ nano-CeO2-CS BPM were only reduced by 0.3V and 0.5V, respectively. Furthermore, the hydrophilicity, and mechanical properties of the modified BPM were increased. Key words: Bipolar membrane; Photocatalysis; Water splitting; nano-ZnO; nano-CeO2 0 Introduction Bipolar membranes (BPMs) comprise an important area of membrane research[1]. Because the thickness of the interlayer, which consists of the area between the cation exchange layer and the anion exchange layer, is in a nano-size, the water at the interlayer should be dissociated to generate H+ and OH? at a high electric field intensity[2] (about 107~109 V/m when 1V voltage is applied). And then, the generated H+ and OH? migrate into the cathode chamber and the anode chamber, respectively[3-4]. Because of its simplicity, high efficiency, and low waste, BPM technology has already been applied in many industrial processes, including pollution control and regeneration of