Synthesis of CuxO-carbonized MOF materials for the removal of ciprofloxacin and its mechanism

• Main Authors: Huang, Ching-Hsuan, 黃景玄
• Other Authors: Bai, Hsun-Ling
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/sy9338

碩士 === 國立交通大學 === 環境工程系所 === 107 === Ciprofloxacin (CIP) is one of the most extensively used antibiotics which has been widely detected in surface water and wastewater. The searching of technology for the enhanced degradation of CIP and other antibiotics is therefore needed. In this study, we found copper metal organic framework (Cu MOF) which can serve as a great adsorbent due to its highly ordered porous structures with high surface area. In addition, Cu MOF can be excited by visible light. Cu MOF can be one of the potential materials in integrated photocatalytic adsorbent. However, Cu MOF has too narrow band gap to have a lower time in electron-hole recombination. In order to solve this problem, we have synthesized CuxO-carbonized MOF hybrid by preparing the urea doped copper metal organic framework (MOF) first and then calcined at 300 C to convert the urea doped Cu-MOF into CuxO-carbonized MOF nanocomposites for the enhanced visible-light-responsive photocatalyst for the degradation of CIP at 465 nm. The results no matter in SEM or TEM are all shown that there are carbon surrounding the materials. Cu(I) and Cu(II) species exist after calcination at 300C in the XRD results. The X-ray absorption spectroscopic and XPS result depicts that Cu ions inside MOF can be converted into CuxO-carbonized MOF in the presence of urea at calcination, and subsequently results in the enhanced photoactivity toward CIP degradation. The CuxO-carbonized MOF hybrids exhibits superior photoactivity and adsorption ability to remove CIP. The total removal efficiency of CIP would be 93.2% of original CIP can be removed after 120 min of adsorption and visible light irradiation and CuxO-carbonized MOF could be reused for over six times with higher than 85% removal efficiency.These results clearly demonstrate that the CuxO-carbonized MOF is a reliable integrated photocatalytic adsorbent, which can open avenue to prepare visible-light-responsive photocatalyst with great potential of application in the decomposition of antibiotics and other emerging pollutants.