Study on material structure design, selective adsorption mechanism, and application for adsorption recovery of oil substances in coal chemical wastewater.
Study on material structure design, selective adsorption mechanism, and application for adsorption recovery of oil substances in coal chemical wastewater.
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DOI：
10.1016/j.chemosphere.2023.140943
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发表时间：
2023-12
期刊：
影响因子：
8.8
通讯作者：
Zhuangzhuang Yang;Yongjun Liu;Pan Liu;Lu Yang;Aining Zhang;Zhe Liu;Xiaowei Li;Zhihua Li
中科院分区：
文献类型：
--
作者：
Zhuangzhuang Yang;Yongjun Liu;Pan Liu;Lu Yang;Aining Zhang;Zhe Liu;Xiaowei Li;Zhihua Li
针对煤化工废水中高乳化、高溶解油难以回收的问题，本研究针对这两种油的主要成分（芳烃类和酚类）构建了一种非极性、大孔、疏水性的吸附材料（pSt-X），用于选择性回收。结果表明，pSt-X的吸附容量为215.52 mg/g，在多次循环中吸附容量保持稳定，始终保持在95%以上。pSt-X具有明显更大的粒径（0.7 mm-1.2 mm），这简化了吸附再生的过程，并有效防止了吸附剂粉末的损失问题。pSt-X吸附剂对溶解油和乳化油表现出显著的选择性，分别表现出90.2%和81.7%的去除率。此外，pSt-X在去除芳烃（AHs）和酚类方面表现出显着的选择性，分别具有77.8%和85.9%的令人印象深刻的去除率。进一步分析了pSt-X对油类物质的选择性吸附机理，指出pSt-X对油类物质的选择性吸附主要是由疏水、π-π和氢键相互作用驱动的，这是由于pSt-X的非极性和大孔结构以及疏水特性造成的。该研究结果为水煤浆中油类物质的绿色低碳回收提供了坚实的理论支撑，对煤化工行业的清洁生产具有积极的现实意义。
In response to the problem of high emulsified and dissolved oils being difficult to recovery from coal chemical wastewater (CCW), this study specifically constructed a non-polar, macropore, and hydrophobic adsorption material (pSt-X) based on the main components of these two oils (aromatics and phenols) for selective recovery. The results revealed that pSt-X had an adsorption capacity of 215.52 mg/g, which had remained stable for multiple recycling sessions, with an adsorption capacity constantly above 95 %. The pSt-X has significantly larger particle size (0.7 mm–1.2 mm), which simplifies the process of adsorption regeneration and effectively prevents the loss of the adsorbent powder problem. The pSt-X adsorbent demonstrated remarkable selectivity towards dissolved and emulsified oils, exhibiting removal rates of 90.2 % and 81.7 %, respectively. Moreover, pSt-X proved remarkable selectivity in removing aromatic hydrocarbons (AHs) and phenols, with impressive removal rates of 77.8 % and 85.9 %, respectively. The selective separation mechanism of pSt-X for oil substances was further analyzed, indicating that its selective adsorption of oils was primarily driven by hydrophobic, π-π, and hydrogen bonding interactions owing to its non-polar and macropore structure and hydrophobic properties. The results of this study provide solid theoretical support for green and low-carbon recovery of oil substances in CCW and are of positive practical importance for clean production in the coal chemical industry.