Fan Shi-Suo, Liu Wen-Pu, Wang Jing-Tao, Hu Hong-Mei, Yang Yi-Ning, Zhou Na
School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
Huan Jing Ke Xue. 2020 Mar 8;41(3):1308-1318. doi: 10.13227/j.hjkx.201908179.
Tea waste biochar (TWBC) was prepared at 300℃, 500℃, and 700℃ under oxygen-limited atmosphere, and was characterized by elemental analysis, Brunauer-Emmett-Teller measurement, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. TWBC was then used to remove tetracycline from aqueous solution. The influences of solid-to-liquid ratio, pH, ionic types, and strength were investigated. The potential mechanism between tetracycline and TWBC was also explored. The results showed that the proper solid-to-liquid ratio was 4 g·L. The pH of the solution had little influence on the removal of tetracycline. The inhibition effects of cation ions on tetracycline follows Mg > Ca > K > Na. The NH in the solution can slightly promote the adsorption of tetracycline by TWBC700. However, the existence of Cu can decrease the adsorption effect of tetracycline by TWBC700. Increasing temperature can improve the adsorption effect of tetracycline by TWBC700. The pseudo-second-order and Langmuir model can well fit the adsorption process of tetracycline onto TWBC. The adsorption capacity of tetracycline by TWBC was TWBC700 > TWBC500 > TWBC300. The mechanisms of tetracycline by TWBC referred to the pore-filling effect, hydrogen binding, and π-π interaction. Therefore, high-temperature TWBC has the potential to act as an adsorbent for removing tetracycline from wastewater.
茶渣生物炭（TWBC）在限氧气氛下于300℃、500℃和700℃制备，并通过元素分析、布鲁诺尔-埃米特-泰勒测量、傅里叶变换红外光谱和X射线光电子能谱进行表征。然后将TWBC用于从水溶液中去除四环素。研究了固液比、pH值、离子类型和强度的影响。还探讨了四环素与TWBC之间的潜在作用机制。结果表明，合适的固液比为4 g·L。溶液的pH值对四环素的去除影响不大。阳离子对四环素的抑制作用顺序为Mg＞Ca＞K＞Na。溶液中的NH可略微促进TWBC700对四环素的吸附。然而，Cu的存在会降低TWBC700对四环素的吸附效果。升高温度可提高TWBC700对四环素的吸附效果。准二级动力学模型和朗缪尔模型能很好地拟合四环素在TWBC上的吸附过程。TWBC对四环素的吸附容量为TWBC700＞TWBC500＞TWBC300。TWBC对四环素的作用机制涉及孔隙填充效应、氢键作用和π-π相互作用。因此，高温TWBC有潜力作为吸附剂用于去除废水中的四环素。
