| 茶渣生物炭制备及其对溶液中四环素的去除特性 |
| 摘要点击 1763 全文点击 685 投稿时间：2019-08-22 修订日期：2019-10-22 |
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| 中文关键词 茶渣生物炭(TWBC) 四环素(TC) 吸附动力学 吸附等温线 机制 |
| 英文关键词 tea waste biochar (TWBC) tetracycline (TC) adsorption kinetics adsorption isotherm mechanism |
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| 中文摘要 |
| 以茶渣（tea waste）为对象，在300、500和700℃限氧条件下热解制备成生物炭（TWBC300、TWBC500和TWBC700），研究其对溶液中四环素（tetracycline，TC）的去除特性.采用元素分析、比表面积分析仪、傅里叶红外光谱（FTIR）和X射线光电子能谱（XPS）对TWBC300、TWBC500及TWBC700进行表征；考察生物炭添加量、溶液初始pH、离子类型及强度等因素对四环素去除效果的影响；结合吸附动力学、吸附等温线和仪器表征结果探究生物炭对溶液中四环素的作用机制.结果表明，适合的生物炭投加量为4.0g·L-1.溶液初始pH对生物炭去除四环素的影响较小.溶液中阳离子类型对生物炭吸附四环素的抑制作用依次是Mg2+ > Ca2+ > K+ > Na+.NH4+能略微促进生物炭对四环素的吸附，而铜离子却显著抑制生物炭对四环素的去除.环境温度增加能提升生物炭对四环素的去除效果.拟二级动力学方程和Langmuir模型可以较好地拟合茶渣生物炭吸附四环素的过程.茶渣生物炭对四环素的吸附量依次是TWBC700 > TWBC500 > TWBC300.孔隙扩散、氢键和π-π作用是茶渣生物炭去除四环素的主要机制.因此，高温制备的茶渣生物炭可作为废水中四环素去除的良好吸附剂. |
| 英文摘要 |
| 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-1. The pH of the solution had little influence on the removal of tetracycline. The inhibition effects of cation ions on tetracycline follows Mg2+ > Ca2+ > K+ > Na+. The NH4+ 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. |
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