Superseded toner cartridges in printers often contain abundant residual toner during the replacement. These toners contain resins, Fe₃O₄, and SiO₂ particles_. Waste toner disposal results in resource wastage and solid waste accumulation. Thus, several methods have been proposed for the high-value-added conversion of waste toners. However, the photothermal conversion ability of toners and its application in solar-driven interfacial evaporation have not yet been explored. Herein, waste toner was recycled via high-temperature calcination and acid etching, which yielded two novel photothermal materials, namely HTC-T and HA-T. The light absorption capacity of HA-T reached 96.84%, and the evaporation rates of methanol, ethanol, isopropanol, water, N,N-dimethylformamide, and N-methyl pyrrolidone under 1 sun irradiation of HA-T membranes were 6.07, 5.95, 6.71, 2.15, 3.74, and 1.49 kg·m^–2·h^–1, respectively. Moreover, HCT-T and HA-T were able to degrade up to 99.99% of methyl orange, methylene blue, and rhodamine B solutions at a concentration of 20 ppm. This study thus provided a recovery technique for waste toner that realized the recycling of solid waste resources with environmental and economic benefits.

中文翻译：

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回收废碳粉构建的光热膜，用于高效的太阳能驱动界面蒸发


打印机中被取代的墨粉盒在更换过程中通常含有大量残留墨粉。这些碳粉含有树脂、Fe₃、O₄ 和 SiO₂ 颗粒，废碳粉处理会导致资源浪费和固体废物积累。因此，已经提出了几种方法来实现废碳粉的高附加值转化。然而，碳粉的光热转换能力及其在太阳能驱动界面蒸发中的应用尚未得到探索。本文通过高温煅烧和酸蚀回收废碳粉，制得了两种新型光热材料，即 HTC-T 和 HA-T。HA-T 的光吸收量达到 96.84%，在 HA-T 膜 1 次阳光照射下，甲醇、乙醇、异丙醇、水、N，N-二甲基甲酰胺和 N-甲基吡咯烷酮的蒸发速率分别为 6.07、5.95、6.71、2.15、3.74 和 1.49 kg·m^–2·h^–1。此外，HCT-T 和 HA-T 能够在 20 ppm 的浓度下降解高达 99.99% 的甲基橙、亚甲蓝和罗丹明 B 溶液。本研究为废碳粉回收技术提供了一种实现固体废弃物资源的循环利用，具有环境和经济效益。