Zhang Xueyang, Miao Xudong, Xiang Wei, Zhang Jiankun, Cao Chengcheng, Wang Hailong, Hu Xin, Gao Bin
Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse, School of Environmental Engineering, Xuzhou University of Technology, Xuzhou, 221018, China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32611, USA.
Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse, School of Environmental Engineering, Xuzhou University of Technology, Xuzhou, 221018, China.
J Hazard Mater. 2021 Feb 5;403:123540. doi: 10.1016/j.jhazmat.2020.123540. Epub 2020 Jul 26.
Pristine biochar (CN600), ball-milled biochar (CN600-BM), HO modified BM-biochar (CN600-O), and NHOH modified BM-biochar (CN600-N) derived from corn stalk were applied to adsorb phenyl volatile organic compounds (VOCs). HO and NHOH modification of BM-biochar significantly improved its physicochemical characteristics and adsorption abilities. The specific surface area of CN600-O increased 2.05 and 1.23 times compared to CN600 and CN600-BM, respectively; while CN600-N increased 2.41 and 1.45 times, respectively. In addition, the ball milled biochars, especially CN600-O, showed higher acidity and polarity than CN600. The VOC adsorption amount onto biochars was 10.96-130.21 mg/g. CN600-O and CN600-N had high uptake of the VOCs and reached 100.07-111.79 mg/g and 110.49-130.21 mg/g, respectively. CN600-N showed the best performance with P-xylene adsorption up to 130.21 mg/g. VOC adsorption onto the CN600-O and CN600-N were mainly governed by surface adsorption and associated with morphology characteristics of the biochars as well as VOC properties such as boiling point and molecular size. Five cycles of adsorption-desorption experiments showed that CN600-O and CN600-N had good reusability with the reuse efficiencies of 88.01 %-92.21 % and 92.19 %-95.39 %, respectively. The results indicate that O- and N-doped ball-milled biochars are promising in adsorption for effective and sustainable VOC removal.
将源自玉米秸秆的原始生物炭（CN600）、球磨生物炭（CN600-BM）、羟基改性球磨生物炭（CN600-O）和氨基改性球磨生物炭（CN600-N）用于吸附苯基挥发性有机化合物（VOCs）。对球磨生物炭进行羟基和氨基改性显著改善了其物理化学特性和吸附能力。与CN600和CN600-BM相比，CN600-O的比表面积分别增加了2.05倍和1.23倍；而CN600-N分别增加了2.41倍和1.45倍。此外，球磨生物炭，尤其是CN600-O，比CN600表现出更高的酸度和极性。生物炭对VOCs的吸附量为10.96 - 130.21 mg/g。CN600-O和CN600-N对VOCs的吸附量较高，分别达到100.07 - 111.79 mg/g和110.49 - 130.21 mg/g。CN600-N对对二甲苯的吸附表现最佳，高达130.21 mg/g。CN600-O和CN600-N对VOCs的吸附主要受表面吸附控制，并与生物炭的形态特征以及VOC的性质如沸点和分子大小有关。五个循环的吸附 - 解吸实验表明，CN600-O和CN600-N具有良好的可重复使用性，重复使用效率分别为88.01% - 92.21%和92.19% - 95.39%。结果表明，氧掺杂和氮掺杂的球磨生物炭在有效且可持续地去除VOCs的吸附方面具有前景。
