中文摘要：

为了寻求蚯蚓粪的资源化途径,采用慢速热解制备蚓粪生物炭（VMBC）,在探讨热解温度对生物炭（VMBC）基本理化性质影响的基础上,深入研究VMBC吸附甲基橙的性能。结果表明,提高热解温度,炭产率与C、H、O、N含量下降,灰分和比表面积则增大。高温有利于生物炭芳香性和疏水性形成。提高热解温度可以改善VMBC对甲基橙的吸附能力。此外,较高的甲基橙初始浓度可促进VMBC对甲基橙的吸附。较低的p H和较高的吸附温度有利于甲基橙的吸附。Freundlich模型可以较好的拟合VMBC对甲基橙的吸附,表明VMBC对甲基橙的吸附为多层非均相吸附,且较容易进行。二级动力学模型能够较好的拟合吸附过程,表明VMBC对甲基橙的吸附受化学作用的主导,且VMBC表面官能团在吸附过程中起到重要的作用。

英文摘要：

To determine a novel path for utilizing vermicompost, slow pyrolysis was employed to prepare vermicompost bioehar （VMBC）. The effect of pyrolytic temperature on the physicochemical characteristics of VMBC were investigated, and the VMBC adsorption performance with methyl orange （MO） was discussed. Bio- char yield and the C, H, O, and N contents of the VMBCs decreased upon increasing pyrolytic temperature, whereas the ash content and specific surface area increased. Examination of the H/C and O/C ratios revealed that VMBC exhibited higher aromaticity and hydrophobicity at the higher pyrolytic temperatures. In addition, MO adsorption by the VMBCs was positively related to the pyrolytic temperature, and the adsorption capacity was im- proved by increasing the initial MO concentration. A lower solution pH and higher adsorption temperature also resulted in improved MO adsorption. Furthermore, the Freundlich isotherm model well simulated MO adsorption, suggesting that this process was a relatively straightforward heterogeneous process. Finally, the adsorption kinet- ics were well described using the second order model, implying that chemical adsorption was dominant, and that the surface functional groups played an important role in MO adsorption, as confirmed by Fourier transform infra- red spectroscopy （FTIR）.