College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China E-mail:
College of Chemistry, Sichuan University, Chengdu 610065, China.
Water Sci Technol. 2022 Jul;86(2):244-260. doi: 10.2166/wst.2022.205.
As a kind of wastewater produced by papermaking industry, bamboo pulp black liquor (BPBL) discharged into water causes serious environmental problems. In this work, BPBL was successfully converted into porous carbon after activation with potassium hydroxide (KOH) through one-step carbonization, and adsorption properties of porous carbon derived from bamboo pulp black liquor (BLPC) for tetracycline hydrochloride (TCH) and malachite green (MG) were studied. The adsorption capacities of BLPC for TCH and MG are 1047 and 1277 mg/g, respectively, due to its large specific surface area of 1859.08 m/g. Kinetics and isotherm data are well fitted to the pseudo-second-order rate model and Langmuir model, respectively. Adsorption experiments and characterizations reveal that the adsorption mechanism involved in TCH and MG adsorption on BLPC mainly depends on the synergistic effect of pore filling, H-bonding, π-π interactions and weak electrostatic interactions. In addition, BLPC shows excellent photothermal properties, and the adsorption capacity of TCH and MG on BLPC can reach 584 and 847 mg/g under the irradiation of near infrared lamp for 50 min, respectively. The synthesized BLPC with high adsorption efficiency, good recovery ability, improved adsorption under near-infrared irradiation can be a promising and effective adsorbent for TCH or MG or other pollutes.
作为造纸工业产生的一种废水，竹浆黑液（BPBL）排入水中会造成严重的环境问题。在这项工作中，通过一步碳化，成功地将 BPBL 与氢氧化钾（KOH）活化转化为多孔碳，研究了竹浆黑液衍生的多孔碳（BLPC）对盐酸四环素（TCH）和孔雀石绿（MG）的吸附性能。由于其比表面积为 1859.08 m²/g，BLPC 对 TCH 和 MG 的吸附容量分别为 1047 和 1277 mg/g。动力学和等温线数据分别很好地拟合了伪二阶速率模型和 Langmuir 模型。吸附实验和表征表明，TCH 和 MG 在 BLPC 上的吸附机制主要取决于孔填充、氢键、π-π相互作用和弱静电相互作用的协同效应。此外，BLPC 具有优异的光热性能，在近红外灯照射 50 分钟后，BLPC 对 TCH 和 MG 的吸附容量分别达到 584 和 847 mg/g。合成的 BLPC 具有高效的吸附能力、良好的回收能力，在近红外光照射下的吸附性能得到改善，有望成为 TCH 或 MG 或其他污染物的一种有前途且有效的吸附剂。
