Pinewood biochar (PBC)-supported metallic silver (Ag^o) was prepared via a one-step carbothermal reduction route (AgH) or a wet-chemistry reduction method (AgW). XRD and SEM confirmed Ag^o was soldered on PBC matrix. Low methylene blue (MB) sorption was observed for unsupported Ag^o nanoparticles (AgNP), AgH and AgW. Under ultraviolet (UV) light irradiation, net MB degradation by AgH (15.88 g kg^-1) was higher than that of AgW (12.50 g kg^-1) and AgNP (10.27 g kg^-1). TOC content after reaction corresponded closely to reduction of MB in solution, indicating MB was dominantly mineralized. Electron paramagnetic resonance (EPR) revealed that MB was degraded by reactive free radicals (ROS) such as hydroxyl radical (OH), superoxide radical (O₂-) and singlet oxygen (¹O₂). The scavenging experiments further suggested that OH scavengers suppressed MB degradation to a greater extent than other quenchers. Compared to AgW, AgH possessed greater abundance of persistent free radicals, which enhance ROS generation. PBC could also improve separation of electron-hole (e--h⁺) pairs and enhance electron transfer ascribing to favorable carbon structure. Besides, PBC-Ag^o maintained good antimicrobial efficacy over E.coli DH5α. This work presented a facile carbothermal route to prepare Ag^o-based photocatalysts for dye removal and microbial inhibition in industrial wastewater.

松木生物炭（PBC）负载的金属银（Ag ^o）是通过一步碳热还原法（AgH）或湿化学还原法（AgW）制备的。XRD和SEM证实Ag ^o已焊接在PBC基质上。对于未负载的Ag ^o纳米颗粒（AgNP），AgH和AgW，观察到低的亚甲基蓝（MB）吸附。在紫外线下，AgH（15.88 g kg ^-1）的净MB降解高于AgW（12.50 g kg ^-1）和AgNP（10.27 g kg ^-1））。反应后的TOC含量与溶液中MB的减少非常接近，表明MB主要被矿化。电子顺磁共振（EPR）表明，MB被羟基自由基（OH），超氧自由基（O _2-）和单线态氧（¹ O ₂）等活性自由基（ROS）降解。清除实验进一步表明，与其他淬灭剂相比，OH清除剂在更大程度上抑制了MB降解。与AgW相比，AgH具有更多的持久性自由基，可增强ROS的生成。PBC还可以改善电子-空穴（e-h ⁺）对的分离，并由于良好的碳结构而增强电子转移。此外，PBC-Ag ^o对大肠杆菌DH5α保持良好的抗菌功效。这项工作提出了一种简便的碳热路线，以制备基于Ag ^o的光催化剂，以去除工业废水中的染料和抑制微生物。