School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
Bioresour Technol. 2021 Apr;325:124732. doi: 10.1016/j.biortech.2021.124732. Epub 2021 Jan 18.
Tetracycline (TC) adsorption capacity on pristine biochar was limited. Biochar modification can greatly improve its adsorption amount. In this study, rice straw was mixed with FeCl·6HO and urea to prepare a Fe-N modified biochar via a one-pot pyrolysis method at 700 °C. Meanwhile, pristine biochar (RSBC), urea modified biochar (N-RSBC), FeCl·6HO-modified biochar (Fe-RSBC) were produced as control. More functional groups, more graphited carbon structure, and magnetic components were observed in Fe-N-RSBC. Compared with RSBC, the surface area, total pore and micropore volume of Fe-N-RSBC increased 3.4-fold, 3.0-fold and 2.3-fold, respectively. The maximum capacity of TC adsorption on Fe-N-RSBC reached 156 mg·g, which was 5.4 - fold, 8.2 - fold and 1.9 - fold increase to that of RSBC, N-RSBC, Fe-RSBC, respectively. The mechanism of TC adsorption on Fe-N-RSBC involved pore filling, hydrogen-bondinteraction, surface complexation, and π-π interaction. Therefore, Fe-N-RSBC can be used as an effective adsorbent for TC removal from aqueous solution.
四环素（TC）在原始生物炭上的吸附容量有限。生物炭改性可以大大提高其吸附量。在本研究中，稻草与六水合氯化铁和尿素混合，通过在 700°C 下的一步热解法制备了一种 Fe-N 改性生物炭。同时，制备了原始生物炭（RSBC）、尿素改性生物炭（N-RSBC）和六水合氯化铁改性生物炭（Fe-RSBC）作为对照。在 Fe-N-RSBC 中观察到更多的官能团、更多石墨化碳结构和磁性成分。与 RSBC 相比，Fe-N-RSBC 的表面积、总孔和微孔体积分别增加了 3.4 倍、3.0 倍和 2.3 倍。Fe-N-RSBC 对 TC 的最大吸附容量达到 156mg·g，分别是 RSBC、N-RSBC 和 Fe-RSBC 的 5.4 倍、8.2 倍和 1.9 倍。TC 在 Fe-N-RSBC 上的吸附机制涉及孔填充、氢键相互作用、表面络合和 π-π 相互作用。因此，Fe-N-RSBC 可用作从水溶液中去除 TC 的有效吸附剂。
