| 改性生物炭吸附焦化废水中苯酚和氨氮的特性及机制 |
| 摘要点击 117 全文点击 7 投稿时间：2024-06-15 修订日期：2024-08-20 |
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| 中文关键词 改性生物炭 焦化废水 苯酚 氨氮 吸附 |
| 英文关键词 modified biochar coking wastewater phenol ammonia nitrogen adsorption |
| DOI 10.13227/j.hjkx.20250729 |
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| 中文摘要 |
| 将玉米秸秆制备成生物炭（CSBC），并通过NaOH处理得到改性生物炭（MCSBC），采用批平衡法研究CSBC和MCSBC对苯酚和氨氮（NH4+-N）的吸附特征，考察了投加量和溶液pH值等因素对MCSBC吸附苯酚和NH4+-N的影响，并结合实验结果与表征数据对MCSBC吸附苯酚和NH4+-N的机制进行了探究.结果表明，CSBC和MCSBC对苯酚的吸附过程是非均相和多种反应协同作用的扩散过程；对NH4+-N的吸附过程以化学吸附为主，且CSBC和MCSBC对二者的吸附过程主要为单分子层吸附.等温吸附数据表明，在双组分系统中，MCSBC对苯酚和NH4+-N的最大吸附量（qm）分别为415.81 mg·g-1和287.73 mg·g-1，相较于单组分系统分别提升了361.55%和11.67%.MCSBC对苯酚的吸附在酸性条件较好，对NH4+-N的吸附在碱性条件较佳，二者共存时可采用焦化废水的平均pH值8；最佳投加量均为4 g·L-1，且MCSBC具有良好的循环再生能力.MCSBC吸附苯酚的机制包括π—π相互作用、氢键作用和孔隙填充作用；吸附NH4+-N的机制包括孔隙填充作用、氢键作用、离子交换作用和静电吸引作用.在双组分系统中，优先被吸附的NH4+-N可通过电荷辅助氢键作用极大促进MCSBC对苯酚的吸附.综上所述，MCSBC对于处理焦化废水中苯酚和NH4+-N具有较高的应用价值. |
| 英文摘要 |
| Corn stalks were prepared into biochar （CSBC）， and modified biochar （MCSBC） was obtained by treatment with NaOH. The adsorption characteristics of phenol and ammonium nitrogen （NH4+-N） on CSBC and MCSBC were studied using a batch equilibrium method. The effects of dosage and solution pH on the adsorption of phenol and NH4+-N by MCSBC were investigated， and the adsorption mechanisms were explored based on the experimental results and characterization data. The results showed that the adsorption of phenol on CSBC and MCSBC was a diffusion process involving heterogeneous and multiple reaction synergistic effects. The adsorption of NH4+-N was mainly governed by chemical adsorption， and the adsorption processes of phenol and NH4+-N on CSBC and MCSBC were primarily monolayer adsorption. Isothermal adsorption data indicated that in the binary component system， the maximum adsorption capacities （qm） of MCSBC for phenol and NH4+-N were 415.81 mg·g-1 and 287.73 mg·g-1， respectively， which increased by 361.55% and 11.67% compared with those in the single-component system. The adsorption of phenol by MCSBC was more effective under acidic conditions， while the adsorption of NH4+-N was more effective under alkaline conditions. When both components coexisted， the average pH value of 8 from coking wastewater could be adopted. The optimal dosage was 4 g·L-1， and MCSBC demonstrated good recycling and regeneration capabilities. The adsorption mechanisms of phenol by MCSBC included π—π interactions， hydrogen bonding， and pore-filling effects. The adsorption mechanisms of NH4+-N included pore filling， hydrogen bonding， ion exchange， and electrostatic attraction. In the binary component system， the preferential adsorption of NH4+-N could significantly enhance the adsorption of phenol on MCSBC through charge-assisted hydrogen bonding. In summary， MCSBC shows high potential for treating phenol and NH4+-N in coking wastewater. |
