科研之友
微信
新浪微博
Facebook
分享链接
摘要
In this study, a porous biochar was prepared by using one-step carbonization activation, with common agricultural waste corn straw as raw material, and with NaHCO3 and melamine as activator. The adsorption of simulated tetracycline (TC) by biochar in wastewater was studied. The Characteristics of the modified porous biochar were performed by using scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman, Fourier transform infrared spectroscopy (FTIR), Brunner-Emmet-Teller (BET) and elemental analysis. The effects of pyrolysis temperature, melamine addition, adsorbent dosage, reaction time, initial concentration, ambient temperature and pH on the removal of TC from aqueous solution by modified porous biochar were investigated. It was found that the modified porous biochar (MPC800-10) has better adsorption capacity for TC, compared with the original biochar (C800), and can quickly and efficiently remove TC. The characterization results show that the modified porous biochar (MPC800-10) obtained by adding NaHCO3 and melamine has larger specific surface area, more porous structure and enhanced aromaticity than the pristine biochar (C800). The hydrophilicity is also increased, with more abundant surface functional groups and the oxygen-containing functional groups. The adsorption of TC by MPC800-10 was fitted well with the Pseudo-second-order kinetic model and the Freundlich isotherm adsorption model, and the maximum adsorption capacity reaches 347 mg?g-1. Thermodynamic analysis results show that the adsorption of TC by MPC800-10 was a spontaneous and endothermic process. MPC800-10 had a good adsorption capacity for TC under both acidic and neutral conditions, and had a good selectivity against ions and regeneration performance. This study will lay a solid foundation for the resource utilization of farmland waste and the pollution control of antibiotics in wastewater. ? 2019, Science Press. All right reserved.
- 单位
