Wastewater treatment generates increasing amounts of unwanted sewage sludges, calling for advanced recycling methods. Here, we transformed sewage sludge into activated carbon by molten salt synthesis with ZnCl₂. We analyzed the structure and specific surface area of sludge-derived activated carbon by Fourier transform infrared spectroscopy and Brunauer–Emmett–Teller analysis. Results show that the mass ratio of ZnCl₂ to sludge had a significant effect on the textural properties and adsorption performance of sludge-derived activated carbon. The maximum specific surface area was 549.72 m²/g, and the carbon utilization potential was 178.56 mg_{(C atom)}/g_(sludge), for a mass ratio of ZnCl₂ to sludge of the total carbon mass in sludge-derived activated carbon adsorbed CO₂ and methylene blue can be achieved to 186.68 and 203.18 mg_{(C atom)}/g_(sludge), respectively.

废水处理会产生越来越多的不需要的污水污泥，需要先进的回收方法。_{在这里，我们通过与 ZnCl 2}的熔盐合成将污水污泥转化为活性炭。我们通过傅里叶变换红外光谱和 Brunauer-Emmett-Teller 分析分析了污泥衍生活性炭的结构和比表面积。结果表明，ZnCl ₂与污泥的质量比对污泥衍生活性炭的结构性质和吸附性能有显着影响。最大比表面积为549.72 m ² /g，碳利用潜力为178.56 mg _{（C原子）} /g _（污泥），质量比为ZnCl ₂污泥衍生活性炭吸附CO ₂和亚甲蓝的总碳质量可分别达到186.68和203.18 mg _{（C原子）} /g _（污泥）。