The residual waste during the separation of carbon dots (C-dots) solution derived from natural resources was usually discarded without further use. In this study, the simultaneous production of C-dots and hydrochar (HC) from straw mushroom through hydrothermal carbonization treatment was carried out to increase the utilities of sustainable resources. The obtained C-dots exhibited good physicochemical and optical properties. The residual waste was retrieved as the HC for the removal of organic dyes. The HC had the BET surface of 11.68 m²/g with an average pore size and pore volume of 15.42 nm and 0.045 m³/g, respectively. The HC showed excellent removal efficiencies for crystal violet (CV) and methylene blue (MB) from aqueous solutions of more than 90%. Under Langmuir's isotherm, the maximum adsorption capacity (q_max) of the HC was 1.88 mg/g and 3.11 mg/g for MB and CV, respectively. The adsorption capacities at time (q_t) of MB and CV were in the range of 1.85–1.94 mg/g and 2.46–2.65 mg/g, respectively. The equilibrium stage happened above 30 min with a mixing time of 2 min. The HC could completely adsorb 2.5 × 10¹⁶ molecules of 25 μM MB and 3.0 × 10¹⁶ molecules of 50 μM CV. The original colors of MB and CV were almost completely removed after introducing the HC to the dye solutions, which demonstrates the possibility of overcoming the environmental pollution problems by sustainably residual waste materials.

来自自然资源的碳点（C-dots）溶液分离过程中的残留废物通常被丢弃而不进一步使用。在这项研究中，通过水热碳化处理从草菇中同时生产碳点和水碳 (HC)，以增加可持续资源的效用。获得的碳点表现出良好的物理化学和光学性能。残余废物作为 HC 回收，用于去除有机染料。HC 的 BET 表面积为 11.68 m ² /g，平均孔径和孔体积分别为 15.42 nm 和 0.045 m ³/g，分别。HC 对水溶液中结晶紫 (CV) 和亚甲蓝 (MB) 的去除效率超过 90%。在朗缪尔等温线下，对于 MB 和 CV，HC的最大吸附容量 ( q _max ) 分别为 1.88 mg/g 和 3.11 mg/g。MB 和 CV在时间 ( q _t )的吸附容量分别在 1.85-1.94 mg/g 和 2.46-2.65 mg/g 的范围内。平衡阶段发生在 30 分钟以上，混合时间为 2 分钟。HC 可以完全吸附 2.5 × 10 ¹⁶分子的 25 μM MB 和 3.0 × 10 ¹⁶50 μM C​​V 的分子。将 HC 引入染料溶液后，MB 和 CV 的原始颜色几乎完全去除，这表明通过可持续的残留废物材料克服环境污染问题的可能性。