School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, PR China; Environmental Science Academy of Inner Mongolia, Hohhot 010011, PR China.
Emission Trading Management Center of Inner Mongolia, Hohhot 010011, PR China.
Sci Total Environ. 2017 Dec 15;603-604:39-48. doi: 10.1016/j.scitotenv.2017.06.006. Epub 2017 Jun 13.
This study investigated the removal of tetracycline (TC) using multilayered graphene-phase biochar (MGB) derived from waste chicken feather. MGB was produced through a two-stage carbonization and KOH-activation method. MGB was characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared (FT-IR), Raman spectra, Zeta potential and elemental analysis. Various chemical functional groups were demonstrated on the surface of MGB. MGB was featured by a very large BET surface area of 1838m/g. A rapid equilibrium (within 30s) and an ultrahigh removal efficiency (up to 99.65%) were obtained when MGB was used in the adsorption of TCs. The adsorption processes were temperature-dependent and the maximum adsorption capacity of MGB was 388.33mg/g at 30°C. The data of adsorption isotherms and kinetics were represented well by the Langmuir and Elovich models, respectively. The chemical monolayer adsorption could play an important role in this process. Furthermore, the adsorption of MGB was tolerant with wide pH, high ionic strength and even co-existing anions. Regeneration experiments indicated the removal efficiency was still satisfied (96.61%) even after four cycles. These results have important implications for the future application of animal waste-derived adsorbents in the treatment of wastewater containing antibiotic residues.
本研究利用由废鸡毛制备的多层石墨烯相生物炭（MGB）去除四环素（TC）。MGB 是通过两步碳化和 KOH 活化法制备的。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外（FT-IR）、拉曼光谱、Zeta 电位和元素分析对 MGB 进行了表征。MGB 表面展示了各种化学官能团。MGB 的 BET 表面积非常大，达到 1838m/g。当 MGB 用于吸附 TC 时，可在 30s 内达到快速平衡（<30s），去除效率极高（高达 99.65%）。吸附过程取决于温度，在 30°C 时，MGB 的最大吸附容量为 388.33mg/g。吸附等温线和动力学数据分别由 Langmuir 和 Elovich 模型很好地表示。化学单层吸附在此过程中可能起重要作用。此外，MGB 的吸附对宽 pH 值、高离子强度甚至共存阴离子具有耐受性。再生实验表明，即使经过四个循环，去除效率仍令人满意（96.61%）。这些结果对未来利用动物废物衍生的吸附剂处理含有抗生素残留的废水具有重要意义。
