Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310028, China.
Bioresour Technol. 2011 Jan;102(2):716-23. doi: 10.1016/j.biortech.2010.08.067. Epub 2010 Sep 21.
Biochar derived from agricultural biomass waste is increasingly recognized as a multifunctional material for agricultural and environmental applications. Three novel magnetic biochars (MOP250, MOP400, MOP700) were prepared by chemical co-precipitation of Fe3+/Fe2+ on orange peel powder and subsequently pyrolyzing under different temperatures (250, 400 and 700 °C), which resulted in iron oxide magnetite formation and biochar preparation in one-step. The MOP400 was comprised of nano-size magnetite particles and amorphous biochar, and thus exhibited hybrid sorption capability to efficiently remove organic pollutants and phosphate from water. For organic pollutants, MOP400 demonstrated the highest sorption capability, and even much larger than the companion non-magnetic biochar (OP400). For phosphate, magnetic biochars, especially MOP250, demonstrated much higher sorption capability than the companion non-magnetic biochars. No significantly competitive effect between organic pollutant and phosphate was observed. These suggest that the magnetic biochar is a potential sorbent to remove organic contaminants and phosphate simultaneously from wastewater.
由农业生物质废物制成的生物炭越来越被认为是一种多功能材料，可用于农业和环境应用。通过在橙皮粉上化学共沉淀 Fe3+/Fe2+，然后在不同温度（250、400 和 700°C）下热解，制备了三种新型磁性生物炭（MOP250、MOP400、MOP700），导致形成氧化铁磁铁矿和一步制备生物炭。MOP400 由纳米尺寸的磁铁矿颗粒和无定形生物炭组成，因此表现出混合吸附能力，可有效去除水中的有机污染物和磷酸盐。对于有机污染物，MOP400 表现出最高的吸附能力，甚至比同伴的非磁性生物炭（OP400）还要大得多。对于磷酸盐，磁性生物炭，特别是 MOP250，表现出比同伴的非磁性生物炭更高的吸附能力。在有机污染物和磷酸盐之间没有观察到明显的竞争效应。这表明磁性生物炭是一种潜在的吸附剂，可以同时从废水中去除有机污染物和磷酸盐。
