The production of macroalgae-derived adsorbent is of great importance to realize the idea of treating pollutants with invaluable renewable materials. Herein, a novel meso-micro porous nano-activated carbon was prepared from green alga Ulava lactuca in a facile way via chemical activation with zinc chloride. The resultant activated carbon possesses a significant specific surface area 1486.3 m²/g. The resulting activated carbon was characterized and investigated for the adsorption of Direct Red 23 (DR23) dye from an aqueous environment. Batch method was conducted to study the effects of different adsorption processes on the DR23 dye adsorption from water. Isotherms and kinetics models were investigated for the adsorption process of DR23 dye. It was found that the adsorption data were well fitted by Langmuir model showing a monolayer adsorption capacity 149.26 mg/g. Kinetic experiments revealed that the adsorptions of DR23 dye can be described with pseudo-second-order model showing a good correlation (R² > 0.997). The prepared activated carbon from Ulava lactuca was exposed to a total of six regeneration experiments. The regeneration result proved that the fabricated activated carbon only loses 19% of its adsorption capacity after six cycles. These results clearly demonstrated the high ability of the obtained active carbon to absorb anionic dyes from the aqueous environment.

大型藻类吸附剂的生产对于实现用宝贵的可再生材料处理污染物的想法具有重要意义。在此，通过氯化锌的化学活化，以绿藻紫菜为原料，以简便的方式制备了一种新型的中微孔纳米活性炭。所得活性炭具有显着的比表面积 1486.3 m ²/G。对所得活性炭进行表征并研究其从水性环境中吸附 Direct Red 23 (DR23) 染料。采用分批法研究不同吸附工艺对水中DR23染料吸附的影响。研究了 DR23 染料吸附过程的等温线和动力学模型。发现吸附数据很好地拟合了朗缪尔模型，显示单层吸附容量为 149.26 mg/g。动力学实验表明，DR23 染料的吸附可以用伪二级模型描述，显示出良好的相关性（R ²  > 0.997）。紫菜制备的活性炭总共进行了六次再生实验。再生结果证明，制备的活性炭在六个循环后仅损失 19% 的吸附容量。这些结果清楚地证明了所获得的活性炭从水性环境中吸收阴离子染料的高能力。