Preparation of nitrogen-doped porous carbon by urea-formaldehyde resin for the construction of membrane adsorption reactor to remove refractory pollutant
Preparation of nitrogen-doped porous carbon by urea-formaldehyde resin for the construction of membrane adsorption reactor to remove refractory pollutant
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DOI：
10.1016/j.seppur.2021.120105
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发表时间：
2021-11
影响因子：
8.6
通讯作者：
Qin Wen;Haoming Chen;Jianjian Wei;Yili Chen;Dehua Ma;Jiansheng Li;Yawei Xie;Xiuyun Sun;
中科院分区：
文献类型：
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作者：
Qin Wen;Haoming Chen;Jianjian Wei;Yili Chen;Dehua Ma;Jiansheng Li;Yawei Xie;Xiuyun Sun;
考虑到剧毒副产物的产生和环境友好性，吸附工艺作为焦化废水中难降解有机物的末端处理是合适的解决方案。通过脲醛树脂（UFCA）碳化和KOH活化制备氮掺杂微介孔碳，实现了焦化废水中喹啉、苯酚和吡啶的有效吸附。其中UFCA-900具有较大的比表面积（SBET=1469.94 m2g−1）和优异的吸附性能：16 min左右对喹啉的吸附去除率达到98.40%，318 K时喹啉的最大吸附量为721.90 mg·g−1，298 K时对苯酚和吡啶的吸附量为 分别为 341.59 mg·g−1 和 225.08 mg·g−1。 UFCA-900的吸附动力学服从准二级模型，吸附过程为吸热过程。膜吸附反应器表现出高效的吸附、良好的分离和可忽略的不可逆膜污染。吸附机理包括静电相互作用、π-π相互作用和氢键。再生试验证明，化学再生的UFCA-900经过6次循环后的去除率与新鲜吸附剂相当。综上所述，我们开发了一种简单的原位氮掺杂多孔碳策略，所得复合材料UFCA-900在焦化废水处理中具有广阔的应用前景。
Considering the highly toxic by-products generation and environmental friendliness, the adsorption process is a suitable solution as the end of pipe treatment for refractory organics in coking wastewater. Nitrogen-doped micro-mesoporous carbon prepared by carbonization and KOH activation of urea–formaldehyde resin (UFCA) realized effective adsorption of quinoline, phenol and pyridine in coking wastewater. Among them, UFCA-900 has large specific surface area (SBET= 1469.94 m2g−1) and excellent adsorption properties: the adsorption removal rate of quinoline reached 98.40% about 16 min, and the maximum adsorption capacity of quinoline was 721.90 mg·g−1at 318 K, the adsorption capacity of phenol and pyridine at 298 K were 341.59 mg·g−1and 225.08 mg·g−1, respectively. The adsorption kinetics of UFCA-900 obeyed the pseudo-second-order model, and the adsorption process was endothermic. The membrane adsorption reactor demonstrated efficient adsorption, well separation, and negligibly irreversible membrane fouling. The adsorption mechanism included electrostatic interactions, π-π interactions and hydrogen bonds. Regeneration test proved that the removal rate of the chemically regenerated UFCA-900 was similar to the fresh adsorbent after six cycles. Taken together, a simple strategy forin-situnitrogen-doped porous carbon has been developed and the resultant composite UFCA-900 has promising application prospect in coking wastewater treatment.