PANI grafted onto waste poros polyurethane for co-adsorption of multiple pollutants in industrial wastewater
PANI grafted onto waste poros polyurethane for co-adsorption of multiple pollutants in industrial wastewater
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DOI：
10.1016/j.jwpe.2023.104195
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发表时间：
2023-10
影响因子：
7
通讯作者：
Ning Wang;Yirui Guo;Yi Song;Wei Yan;Xuesong Gong;Yunfeng Li;Rui hua Mu;Yonghong Liu
中科院分区：
文献类型：
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作者：
Ning Wang;Yirui Guo;Yi Song;Wei Yan;Xuesong Gong;Yunfeng Li;Rui hua Mu;Yonghong Liu
同时从工业废水中吸收多种污染物是吸附技术领域面临的一个紧迫挑战。本研究设计了一种以废旧聚氨酯(PU)为载体的聚苯胺(PANI)基吸附剂，并考察了其同时吸附各种污染物的能力。结果表明，在模拟多污染物废水中，该吸附剂对酸性红G、亚甲基蓝、铬(VI)、磷(TP)、氨氮、硝酸盐氮、化学需氧量的同步去除效率分别为88%、40%、90%、58%、42%、30%、63%。相应的吸附容量分别为255.81、22.57、105.32、10.04、7.98、23.03和236.31 mg/gP/T。连续流柱吸附1800min(144柱)后达到饱和，再生5次后吸附效率仍未见明显下降。X射线光电子能谱和激发发射矩阵谱分析表明，Arg、Cr(VI)、NO3−-N和Tp竞争相同的吸附位置，其中Arg的亲和力最强，其次是Cr(VI)、Tp和NO3−-N。在吸附过程中，PANI链上的铬(VI)与N-发生氧化还原反应，生成铬(III)和-NH+-物种，进一步增强了对H_2PO_4-−等阴离子污染物的吸附。吸附前污染物之间的相互作用直接影响后续的吸附过程。总体而言，这些发现证明了PU-P/T吸附剂作为一种潜在的工程吸附剂对多种污染物进行共吸附的可行性和有效性。
Simultaneously up-taking multiple pollutants from industrial wastewater is an urgent challenge in the field of adsorption technology. In this study, a polyaniline (PANI)-based adsorbent supported by waste polyurethane (PU) was designed, and its capability for simultaneous adsorption of various pollutants was investigated. The results revealed that in a simulated multi-pollutant wastewater, the adsorbent demonstrated synchronous removal efficiencies of 88% for acid red G (ARG), 40% for methylene blue (MB), 90% for Cr(VI), 58% for phosphorus (TP), 42% for NH4+-N, 30% for NO3−-N, and 63% for chemical oxygen demand (COD). The corresponding adsorption capacities were 255.81, 22.57, 105.32, 10.04, 7.98, 23.03 and 236.31 mg/gP/T, respectively. The continuous flow column adsorption lasted for 1800 min (144 columns) before reaching saturation, and no significant decrease in adsorption efficiency was observed even after 5 cycles of regeneration. X-ray photoelectron spectroscopy (XPS) and excitation-emission matrix spectroscopy (EEM) analysis revealed that ARG, Cr(VI), NO3−-N, and TP competed for the same adsorption sites, with ARG exhibiting the highest affinity, followed by Cr(VI), TP, and NO3−-N. During the adsorption process, redox reactions occurred between Cr(VI) and =N- in the PANI chain, resulting in the formation of Cr(III) and -NH+- species, which further enhanced the adsorption of anionic pollutants such as H2PO4−. The interaction between pollutants before adsorption directly affected the subsequent adsorption process. Overall, these findings demonstrate the feasibility and effectiveness of the PU-P/T adsorbent as a potential engineering adsorbent for co-adsorption of a variety of pollutants.