Hydrochar (AAHC) with rich carboxylate groups was prepared by one-step hydrothermal carbonization (HTC) of bamboo and acrylic acid with the presence of ammonium persulphate, and then activated by a sodium hydroxide solution. AAHC was featured by elemental analysis, SEM, XPS, FTIR, Zeta potential analysis and N₂ adsorption–desorption isotherms, and applied to test adsorptive ability of methylene blue (MB) by batch sorption experiments. Despite a small Brunauer-Emmett-Teller (BET) surface area of 5.03 m²·g⁻¹, AAHC has excellent MB adsorbing capacity owing to the richness of carboxylate groups. Compared with hydrochar produced without adding ammonium persulphate, AAHC exhibits larger BET surface, pore volume and carboxylate groups, indicating a small amount of ammonium persulfate plays an important role in HTC in addition to the free radical initiator. This work provides a facile and cheap method combining HTC and polymerization for preparation of carboxylate-rich hydrochar.

在过硫酸铵的存在下，通过竹子和丙烯酸的一步水热碳化 (HTC)，然后用氢氧化钠溶液活化，制备了具有丰富羧酸根基团的 Hydrochar (AAHC)。AAHC通过元素分析、SEM、XPS、FTIR、Zeta电位分析和N ₂吸附-解吸等温线表征，并通过批量吸附实验用于测试亚甲基蓝（MB）的吸附能力。尽管Brunauer-Emmett-Teller (BET) 表面积很小，仅为5.03 m ² ·g ^-1, 由于羧酸酯基团的丰富性，AAHC 具有优异的 MB 吸附能力。与不添加过硫酸铵生产的水炭相比，AAHC 表现出更大的 BET 表面积、孔体积和羧酸根，表明除了自由基引发剂外，少量过硫酸铵在 HTC 中也起着重要作用。这项工作提供了一种简便且廉价的方法，结合 HTC 和聚合制备富含羧酸盐的氢化碳。