Sequentially photocatalytic degradation of mussel-inspired polydopamine: From nanoscale disassembly to effective mineralization

• Published in: Journal of colloid and interface science Vol. 672; pp. 329 - 337
• Main Authors: Liu, Xinghuan, Li, Danya, Tabassum, Mehwish, Huang, Chao, Yi, Ke, Fang, Tianwen, Jia, Xin
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 15.10.2024
• Subjects: Mineralization; Mussel-inspired polydopamine; Photocatalytic degradation; Surface patterning; Mussel-inspired polydopamine; Photocatalytic degradation; Surface patterning; Mineralization
• ISSN: 0021-9797; 1095-7103; 1095-7103
• DOI: 10.1016/j.jcis.2024.06.008

The photodegradation and deadhesion of mussel-inspired polydopamine was reported from nanoscale disassembly to effective mineralization. Various PDA coated templates and PDA hollow structures can be photodegraded by this strategy. The patterned and gradient surfaces were prepared by the “top-down” method under the control of light scope and intensity, respectively. [Display omitted] Mussel-inspired polydopamine (PDA) coating has been utilized extensively as versatile deposition strategies that can functionalize surfaces of virtually all substrates. However, the strong adhesion, stability and intermolecular interaction of PDA make it inefficient in certain applications. Herein, a green and efficient photocatalytic method was reported to remove adhesion and degrade PDA by using TiO2-H2O2 as photocatalyst. The photodegradation process of the PDA spheres was first undergone nanoscale disassembly to form soluble PDA oligomers or well-dispersed nanoparticles. Most of the disassembled PDA can be photodegraded and finally mineralized to CO2 and H2O. Various PDA coated templates and PDA hollow structures can be photodegraded by this strategy. Such process provides a practical strategy for constructing the patterned and gradient surfaces by the “top-down” method under the control of light scope and intensity. This sequential degradation strategy is beneficial to achieve the decomposition of highly crosslinked polymers.