Cui Ce, Yang Mengyuan, Zhai Jianyu, Bai Wenhao, Dai Lanling, Liu Li, Jiang Shan, Wang Weijie, Ren Erhui, Cheng Cheng, Guo Ronghui
College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China.
Yibin Industrial Technology Research Institute of Sichuan University, Yibin, Sichuan, China.
Environ Sci Pollut Res Int. 2023 Jan;30(5):12558-12570. doi: 10.1007/s11356-022-22926-9. Epub 2022 Sep 16.
Activated carbon has been widespread applied in the removal of pollutants in wastewater. However, many biomass-derived activated carbon suffer from the challenge of controllable pore size regulation, hindering their efficient adsorption of pollutants. Herein, bamboo-derived activated carbon aerogel (BACA) has been successfully prepared through KOH high-temperature activation of cellulose aerogel which was prepared using cellulose extracted from bamboo. Bamboo cellulose aerogel provides sufficient reaction sites for KOH, which is conducive to the formation of a mass of mesoporous structures on the pore walls of the activated carbon aerogel. The optimal BACA adsorbent shows high specific surface area (2503.80 m/g), and maximum adsorption capability for tetracycline hydrochloride (TCH) reaches 863.8 mg/g at 30 ℃. The removal efficiencies of TCH are 100% and 98.4% at 40 ℃ when the initial concentrations are 500 and 700 mg/L, respectively. Adsorption kinetics and isotherm indicate that the adsorption of BACA for TCH is monolayer adsorption based on chemical adsorption. Spontaneous and endothermic adsorption processes are proved by adsorption thermodynamic studies. Additionally, coexisting ions have insignificant effect on TCH adsorption, and the BACA sample displays excellent adsorption property for five reuse cycles with a removal efficiency of 80.95%, indicating the outstanding adsorption capacity of BACA in practical application. The excellent adsorption performance provides BACA with a promising perspective to remove TCH from wastewater, and the prepared method of BACA can be widely extended to other biomass materials.
活性炭已广泛应用于废水中污染物的去除。然而，许多生物质衍生的活性炭面临着孔径可控调节的挑战，这阻碍了它们对污染物的高效吸附。在此，通过对从竹子中提取的纤维素制备的纤维素气凝胶进行KOH高温活化，成功制备了竹基活性炭气凝胶（BACA）。竹纤维素气凝胶为KOH提供了足够的反应位点，有利于在活性炭气凝胶的孔壁上形成大量介孔结构。最佳的BACA吸附剂具有较高的比表面积（2503.80 m/g），在30℃下对盐酸四环素（TCH）的最大吸附能力达到863.8 mg/g。当初始浓度分别为500和700 mg/L时，在40℃下TCH的去除效率分别为100%和98.4%。吸附动力学和等温线表明，BACA对TCH的吸附是基于化学吸附的单层吸附。吸附热力学研究证明吸附过程是自发的吸热过程。此外，共存离子对TCH吸附的影响不显著，BACA样品在五个重复使用周期内表现出优异的吸附性能，去除效率为80.95%，表明BACA在实际应用中具有出色的吸附能力。优异的吸附性能为BACA从废水中去除TCH提供了广阔的前景，且BACA的制备方法可广泛推广到其他生物质材料。
