Oh Seok-Young, Seo Tae-Cheol
Department of Civil and Environmental Engineering, University of Ulsan 93 Daehak-ro, Nam-gu Ulsan 44610 South Korea
RSC Adv. 2019 Sep 9;9(48):28284-28290. doi: 10.1039/c9ra05518e. eCollection 2019 Sep 3.
Spent polyethylene terephthalate (PETE) bottles were collected and co-pyrolyzed with rice straw (RS) to examine the characteristics and performance of biochar as a sorbent for various types of U.S. EPA priority pollutants, including 2,4-dinitrotoluene (DNT), 2,4-dichlorophenol (DCP), Pb, chromate (CrO ), and selenate (SeO ). During sorption of contaminants to PETE/RS-derived biochar, PETE residues from pyrolysis, pH, and pyrolysis temperature greatly affected the sorption process. Depending on the types of contaminants and experimental conditions, co-pyrolysis of PETE and RS may enhance the sorption of contaminants through different sorption mechanisms, including hydrophobicity, electrostatic force, ion exchange, surface complexation, and surface precipitation. Unlike other contaminants, selenate was reductively transformed by delocalized electrons from the graphitic structure in biochar. Our results strongly suggest that co-pyrolysis of PETE and agricultural wastes may be favorable to enhance the properties of biochar. In addition to syn-gas and bio-oil from co-pyrolysis, biochar may be a valuable by-product for commercial use.
收集用过的聚对苯二甲酸乙二酯（PETE）瓶，并将其与稻草（RS）共同热解，以研究生物炭作为吸附剂对包括2,4-二硝基甲苯（DNT）、2,4-二氯苯酚（DCP）、铅、铬酸盐（CrO）和硒酸盐（SeO）在内的各类美国环保署优先污染物的吸附特性和性能。在污染物吸附到PETE/RS衍生生物炭的过程中，热解产生的PETE残渣、pH值和热解温度对吸附过程有很大影响。根据污染物类型和实验条件，PETE与RS的共同热解可能通过不同的吸附机制增强污染物的吸附，这些机制包括疏水性、静电力、离子交换、表面络合和表面沉淀。与其他污染物不同，硒酸盐会被生物炭石墨结构中的离域电子进行还原转化。我们的结果有力地表明，PETE与农业废弃物的共同热解可能有利于增强生物炭的性能。除了共同热解产生的合成气和生物油外，生物炭可能是一种有商业价值的副产品。
