Graphene oxide-Ag 2 CO 3 (GO-Ag 2 CO 3 ) composites have been prepared by a simple and effective precipitation method, and found to exhibit a higher photocatalytic activity toward degradation of organic dyes, including rhodamine B, methylene blue and methyl orange, in aqueous solution, than pure Ag 2 CO 3 crystal under visible light. The Ag 2 CO 3 crystal with 0.9 wt% GO content exhibited the highest photodegradation efficiency for organic dyes, which was 2 times that of pure Ag 2 CO 3 crystal. The improved photocatalytic activity of GO-Ag 2 CO 3 composites was attributed to the corporative effects of high-surfacearea of GO sheets, enhanced absorption of organic dyes, small band gap, more efficient separation of photogenerated electron-hole pairs, and good electron acceptor properties of GO. The photocorrosion of Ag 2 CO 3 crystal can be efficiently inhibited by GO, since the transfer of photogenerated electrons from the surface of Ag 2 CO 3 crystal to GO sheets can reduce the possibility of decomposing Ag + to Ag 0 , which resulted in an improved stability and recyclability of the GO-Ag 2 CO 3 composite in the photocatalytic reaction. This facile and straightforward method has promising applications in the fabrication of different graphene oxide-based heterostructure photocatalysts.

Highly ordered noncrystalline boron-doped nickel nanotube arrays are rapidly synthesized within 150 s by template-based electroless deposition. The as-prepared nanotubes have tunable magnetic properties and exhibit super efficient catalytic activity (∼70 s) for the reduction of 4-nitrophenol.

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Bio‐therapeutics, such as stem cells, nucleic acids, and growth factors, represent the frontier of regenerative medicines. The excessive accumulation of reactive oxygen species (ROS) is an essential mechanism in tissue degeneration or injury, which stimulates deleterious oxidative damage to the administered bio‐therapeutics. Likewise, a high level of ROS provokes critical damage to vital endogenous biomacromolecules, such as proteins, lipids, and nucleic acids, which restricts the innate regeneration. Recently, ROS‐scavenging nanozymes gain increasing attention from the field of regenerative medicine, which are able to protect bio‐therapeutics and endogenous actives from oxidative damage and facilitate innate regeneration. ROS‐scavenging nanozyme becomes a novel bioactive platform technology that enables the development of tailored materials for regenerative therapies. Herein, we provide a review on the chemical mechanism of ROS‐scavenging nanozymes, and summarize their applications within the scope of tissue repair and regeneration. We also discuss the current limitations and future directions of ROS‐scavenging nanozymes in the field of regenerative medicine from a perspective of clinical translation. Hopefully, our work may inspire further innovation of advanced ROS‐modulating biomaterials, which will accelerate the evolution of regenerative medicine.