Wang Renjun, Hu Lijun, Wang Mengjiao, Wei Yushan, Xu Yuling, Zhang Xinyi, Chen Junfeng
School of Life Sciences, Qufu Normal University, Qufu, 273165, PR China.
School of Life Sciences, Qufu Normal University, Qufu, 273165, PR China.
Chemosphere. 2023 Dec;343:140276. doi: 10.1016/j.chemosphere.2023.140276. Epub 2023 Sep 25.
Photocatalytic technology for inactivating harmful algae has shown great research potential, in previous work, a kind of non-noble metal modified TiO loading onto copper metal organic framework (SNP-TiO@Cu-MOF) was proved to show high removal efficiency against Karenia mikimotoi (K. mikimotoi). However, the recovery problem of powdered photocatalysts and its potential ecological hazards were still existed. In order to solve this, this study selected four macro-floating carriers and loaded photocatalyst on their surface. The floating photocatalyst with luffa sponge and expanded perlite as carriers were prepared by hydrothermal synthesis, and the floating photocatalyst with melamine sponge and polyurethane sponge as carriers were prepared by sodium alginate fixation method. The photocatalyst was firmly supported on the carriers, and the octahedral structure of SNP-TiO@Cu-MOF photocatalyst could be well retained by hydrothermal synthesis. The advantages of sodium alginate fixation method were simple preparation process and low cost. The specific surface area of melamine foam photocatalyst (MF-P) was the highest, 28.47 m/g, and the algae inactivation rate was also the best, which was 98.68% in 6 h. The MF-P group showed a decrease of 81.8% in soluble protein content and 81.4% in chlorophyll-a content of K. mikimotoi after 1 h of photocatalysis, respectively. The four photocatalysts showed good recyclability, and especially in MF-P group. The inactivation efficiency was still as high as 94.12% after four experiments. The floating photocatalyst would lay the foundation for further application of photocatalytic materials for algae removal.
光催化技术用于灭活有害藻类已显示出巨大的研究潜力，在先前的工作中，一种负载在铜金属有机框架上的非贵金属改性TiO（SNP-TiO@Cu-MOF）被证明对米氏凯伦藻（K. mikimotoi）具有高去除效率。然而，粉末状光催化剂的回收问题及其潜在的生态危害仍然存在。为了解决这个问题，本研究选择了四种宏观漂浮载体并将光催化剂负载在其表面。以丝瓜海绵和膨胀珍珠岩为载体的漂浮光催化剂通过水热合成制备，以三聚氰胺海绵和聚氨酯海绵为载体的漂浮光催化剂通过海藻酸钠固定法制备。光催化剂被牢固地负载在载体上，通过水热合成可以很好地保留SNP-TiO@Cu-MOF光催化剂的八面体结构。海藻酸钠固定法的优点是制备过程简单且成本低。三聚氰胺泡沫光催化剂（MF-P）的比表面积最高，为28.47 m²/g，藻类灭活率也最好，在6小时内为98.68%。光催化1小时后，MF-P组米氏凯伦藻的可溶性蛋白含量下降了81.8%，叶绿素a含量下降了81.4%。这四种光催化剂均表现出良好的可回收性，尤其是在MF-P组中。经过四次实验后，灭活效率仍高达94.12%。漂浮光催化剂将为光催化材料在藻类去除方面的进一步应用奠定基础。
