Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan.
Department of Civil and Environmental Engineering, University of Delaware, Newark, USA.
Environ Pollut. 2020 Oct;265(Pt B):114914. doi: 10.1016/j.envpol.2020.114914. Epub 2020 Jun 27.
Sludge from a groundwater treatment plant was used to prepare biochar by pyrolysis. The Fe-Mn rich biochar was used to activate percarbonate for the remediation of polycyclic aromatic hydrocarbons (PAHs) contaminated aquatic sediments. Results showed that the sludge-derived biochar (SBC) produced at a pyrolysis temperature of 700 °C was the most effective in activating percarbonate, which exhibited significant oxidative removal of PAHs. PAHs degradation took place via a Fenton-like oxidation manners, contributed from the Fe/Fe and Mn/Mn redox pairs, and achieved the highest degradation efficiency of 87% at pH 6.0. Reactions between oxygenated functional groups of biochar and HO generated of O and HO• radicals in abundance under neutral and alkaline pH was responsible for the catalytic degradation of PAHs. Our results provided new insights into the environmental applications of SBC for the green sustainable remediation of organics-contaminated sediments and aided in reduction of associated environmental and health risk.
地下水处理厂的污泥经热解制备生物炭。富铁锰生物炭用于活化过碳酸盐，以修复多环芳烃（PAHs）污染的水下水体沉积物。结果表明，在 700°C 热解温度下制备的污泥衍生生物炭（SBC）在活化过碳酸盐方面最为有效，对 PAHs 的氧化去除具有显著效果。PAHs 的降解通过类芬顿氧化方式进行，这归因于 Fe/Fe 和 Mn/Mn 氧化还原对，在 pH 值为 6.0 时，达到了最高的 87%的降解效率。在中性和碱性 pH 条件下，生物炭的含氧官能团与大量生成的 O 和 HO•自由基之间的反应，负责 PAHs 的催化降解。我们的研究结果为 SBC 在绿色可持续修复有机污染沉积物中的环境应用提供了新的见解，并有助于降低相关的环境和健康风险。
