Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Zhejiang, Provincial Key Laboratory of Agricultural Resources and Environment, Hangzhou 310058, China.
Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Zhejiang, Provincial Key Laboratory of Agricultural Resources and Environment, Hangzhou 310058, China.
Sci Total Environ. 2017 Feb 1;578:399-407. doi: 10.1016/j.scitotenv.2016.10.196. Epub 2016 Nov 8.
This study investigated the characteristics of nanoscale bamboo charcoal (NBC), and made a comparison with microscale bamboo charcoal (MBC) on how they impact on the sorption abilities of different soils. The two charcoals contained similar elemental contents (e.g., high C, low H and low N) and various functional groups on their surfaces (e.g., aromatic structure, carboxyl, and hydroxyl). However, NBC had a larger total pore volume than that of MBC and was more likely to generate multi-layer sorption of phenanthrene. Controlled by van der Waals forces and electrostatic forces, NBC formed meso-and macropores (intra-particle porosity) and a more intricate pore structure. The performance of NBC in aqueous and soil-water systems was conspicuous and impressing. In aqueous system, by virtue of its larger pore volume, surface area and nonprotonated aromatic carbon, the K (sorption coefficient) of NBC reached up to 1.24×10, almost 10 times higher than that of MBC. In soil-water systems, although it could aggregate and react with compounds in soil, the performance of NBC was not weakened by the complicated soil properties, and was still more capable of phenanthrene sorption than MBC, even at an extremely low addition rate 0.2% in soils. Additionally, in comparison with some other common biochars, NBC still showed a promising capacity for phenanthrene sorption in two systems. This finding increases our knowledge of NBC for the remediation of organic pollutants in soil and indicates that the addition rate of charcoals in soils could be reduced by lessening the particle size. Therefore, NBC provides a new possibility for soil pollutant remediation and deserves further research.
本研究考察了纳米竹炭（NBC）的特性，并将其与微米竹炭（MBC）进行了比较，研究它们对不同土壤吸附能力的影响。两种炭都含有相似的元素含量（例如，高 C、低 H 和低 N）和表面的各种官能团（例如，芳香结构、羧基和羟基）。然而，NBC 的总孔体积大于 MBC，更有可能对菲产生多层吸附。NBC 通过范德华力和静电力控制，形成中孔和大孔（颗粒内孔隙）和更复杂的孔隙结构。NBC 在水相和土壤-水系统中的性能引人注目。在水相系统中，由于 NBC 具有较大的孔体积、表面积和非质子化芳香碳，其 K（吸附系数）高达 1.24×10，几乎是 MBC 的 10 倍。在土壤-水系统中，尽管 NBC 可能会聚集并与土壤中的化合物发生反应，但 NBC 的性能并没有被复杂的土壤性质所削弱，其对菲的吸附能力仍然比 MBC 更强，即使在土壤中的添加率极低（0.2%）的情况下也是如此。此外，与其他一些常见的生物炭相比，NBC 在两种系统中对菲的吸附能力仍然表现出很大的潜力。这一发现增加了我们对 NBC 修复土壤中有机污染物的认识，并表明可以通过减小炭的粒径来降低土壤中炭的添加率。因此，NBC 为土壤污染物修复提供了新的可能性，值得进一步研究。
