Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Bioresour Technol. 2015 Jan;175:269-74. doi: 10.1016/j.biortech.2014.10.103. Epub 2014 Oct 25.
Biochar (BC) supported nanoscale zerovalent iron (nZVI) composite was synthesized and used as an activator for persulfate to enhance the trichloroethylene (TCE) removal in aqueous solutions. The degradation efficiency of TCE (0.15mmolL(-1)) was 99.4% in the presence of nZVI/BC (4.5mmolL(-1), nZVI to BC mass ratio was 1:5) and persulfate (4.5mmolL(-1)) within 5min, which was significantly higher than that (56.6%) in nZVI-persulfate system under the same conditions. Owing to large specific surface area and oxygen-containing functional groups of BC, nZVI/BC enhanced the SO4(-) generation and accelerated TCE degradation. On the basis of the characterization and analysis data, possible activation mechanisms of the Fe(2+)/Fe(3+) (Fe(II)/Fe(III)) redox action and the electron-transfer mediator of the BC oxygen functional groups promoting the generation of SO4(-) in nZVI/BC-persulfate system were clarified.
生物炭（BC）负载纳米零价铁（nZVI）复合材料被合成并用作过硫酸盐的活化剂，以增强水溶液中三氯乙烯（TCE）的去除。在 nZVI/BC（4.5mmolL(-1)，nZVI 与 BC 的质量比为 1:5）和过硫酸盐（4.5mmolL(-1)）存在下，TCE（0.15mmolL(-1)）的降解效率在 5min 内达到 99.4%，明显高于相同条件下 nZVI-过硫酸盐体系（56.6%）。由于 BC 具有较大的比表面积和含氧官能团，nZVI/BC 增强了 SO4(-)的生成并加速了 TCE 的降解。基于表征和分析数据，阐明了 nZVI/BC-过硫酸盐体系中 Fe(II)/Fe(III)（Fe(II)/Fe(III)）氧化还原作用的可能活化机制和 BC 氧官能团作为电子转移介质促进 SO4(-)生成的机制。
