School of Environmental and Safety Engineering, Changzhou University, Changzhou, 213164, People's Republic of China.
Changzhou Cheff Environmental Protection Technology Co., Ltd, Changzhou, 213164, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Apr;29(18):27595-27605. doi: 10.1007/s11356-021-18285-6. Epub 2022 Jan 4.
In this work, tea waste biochar was prepared and used to activate peroxodisulfate (PDS) for the removal of tetracycline (TC) efficiently. And SEM, XRD, Raman, and FTIR were used to characterize the biochar. The effects of reaction conditions including initial pH, biochar dosage, and PDS concentration on the removal of TC were explored, and the result showed that compared with the biochar prepared at 400 °C and 500 °C, the biochar pyrolyzed at 600 °C (TBC600) had the highest TC removal performance due to its higher sp hybrid carbon content, richer defective structure, and stronger electron deliverability. Under the optimal dosage of PDS (4 mM) and TBC600 (0.8 g L), the removal efficiency of TC (10 mg L) reached 81.65%. After four cycles of TBC600, the removal rate could still reach 75.51%, indicating that TBC600 has excellent stability. In addition, quenching experiments and electron paramagnetic resonance (EPR) verified that the active oxygen including SO·, ·OH, O·, and singlet oxygen (O) was involved, among which O and OH were the main active substance in the TC removal. Therefore, this work provided a green and efficient persulfate activator and a method for recycling tea waste.
在这项工作中，制备了茶废料生物炭，并将其用于有效激活过二硫酸盐（PDS）以去除四环素（TC）。采用 SEM、XRD、拉曼和 FTIR 对生物炭进行了表征。考察了反应条件（包括初始 pH 值、生物炭用量和 PDS 浓度）对 TC 去除的影响，结果表明，与在 400°C 和 500°C 下制备的生物炭相比，在 600°C 下热解得到的生物炭（TBC600）具有最高的 TC 去除性能，这归因于其具有更高的 sp 杂化碳含量、更丰富的缺陷结构和更强的电子传递能力。在最佳 PDS（4 mM）和 TBC600（0.8 g L）用量下，TC（10 mg L）的去除效率达到 81.65%。经过四次 TBC600 循环后，去除率仍可达到 75.51%，表明 TBC600 具有优异的稳定性。此外，猝灭实验和电子顺磁共振（EPR）验证了包括 SO·、·OH、O·和单线态氧（O）在内的活性氧的参与，其中 O 和 OH 是 TC 去除的主要活性物质。因此，这项工作为过硫酸盐提供了一种绿色高效的激活剂，并为茶废料的回收提供了一种方法。
