Cobalt-impregnated biochar produced from CO2-mediated pyrolysis of Co/lignin as an enhanced catalyst for activating peroxymonosulfate to degrade acetaminophen.
Cobalt-impregnated biochar produced from CO2-mediated pyrolysis of Co/lignin as an enhanced catalyst for activating peroxymonosulfate to degrade acetaminophen.
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DOI：
10.1016/j.chemosphere.2019.04.004
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发表时间：
2019-07
期刊：
影响因子：
8.8
通讯作者：
Ming-Tong Yang;Yunchen Du;Wai-Chi Tong;Alex C. K. Yip;K. Lin
中科院分区：
文献类型：
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作者：
Ming-Tong Yang;Yunchen Du;Wai-Chi Tong;Alex C. K. Yip;K. Lin
− 虽然基于硫酸根（SO4 自由基点−）的过程可用于降解对乙酰氨基酚 (ACE)，但使用过一硫酸盐 (PMS) 降解 ACE 的研究相当有限。此外，虽然Co被证实是激活PMS最有效的金属，但很少有Co催化剂被开发和研究用于激活PMS以降解ACE。由于碳是一种很有前景的支撑钴纳米颗粒（NP）以形成钴/碳复合催化剂的基材，因此大多数现有的碳基材需要精密的制造。由于生物炭是一种易于获得但用途广泛的碳材料，Co/木质素的热解提供了一种有利的共浸渍生物炭（CoIB），作为 PMS 活化的有吸引力的催化剂。具体而言，当CO 2 替代N 2 作为Co/木质素热解的反应介质时，可以显着改善热解合成气的产量并提供磁性CoIB。该CoIB由均匀分布的Co纳米粒子（NPs）组成，浸渍在生物炭的碳基质中，具有高孔隙率、大表面积和磁性等多种优异特性，使CoIB成为激活PMS降解ACE的有前途的催化剂。对于降解 ACE，CoIB 还表现出比 CoIB 单键 N2 和 Co3O4 高得多的 PMS 活化催化活性。 CoIB 还可回收用于激活 PMS，从而在多个周期内有效降解 ACE。根据降解产物提出了 CoIB 激活的 PMS 的 ACE 降解途径。这些发现证实CoIB确实是一种有利的多相催化剂，它可以通过Co/木质素在CO2中的热解轻松制备，同时增强合成气产量，从而有效激活PMS以降解ACE。
−While sulfate radical (SO4radical dot−)-based processes are useful to degrade acetaminophen (ACE), studies of using peroxymonosulfate (PMS) to degrade ACE are quite limited. In addition, although Co is validated as the most effective metal for activating PMS, very few Co catalysts have been developed and investigated for activating PMS to degrade ACE. Since carbon is a promising substrate to support Co nanoparticles (NPs) to form Co/carbon composite catalysts, most existing carbon substrates require delicate fabrications. As biochar is an easy-to-obtain but versatile carbon material, pyrolysis of Co/lignin affords an advantageous Co-impregnated biochar (CoIB) as an attractive catalyst for PMS activation. Specifically, as CO2substitutes N2as a reaction medium for pyrolysis of Co/lignin, the syngas production from pyrolysis can be substantially improved and a magnetic CoIB is afforded. This CoIB consists of evenly-distributed Co nanoparticles (NPs) impregnated in carbon matrices of biochar, and possesses several superior characteristics, such as high porosity, large surface area and magnetism, enabling CoIB a promising catalyst for activating PMS to degrade ACE. CoIB also shows a much higher catalytic activity of PMS activation than CoIBsingle bondN2, and Co3O4for degrading ACE. CoIB is also recyclable for activating PMS to effectively degrade ACE for multiple cycles. The ACE degradation pathway by this CoIB-activated PMS is proposed according to the degradation products. These findings validate that CoIB is assuredly an advantageous heterogeneous catalyst, which can be easily prepared from pyrolysis of Co/lignin in CO2with concomitant enhanced syngas production for effectively activating PMS to degrade ACE.