Poly-N-phenylglycine@multi-walled carbon nanotubes composite membrane for improvement of Au(III) adsorption
Poly-N-phenylglycine@multi-walled carbon nanotubes composite membrane for improvement of Au(III) adsorption
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Poly-N-phenylglycine@multi-walled碳纳米管复合膜对Au（III）吸附性能的改善
DOI：
10.1016/j.seppur.2022.122404
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发表时间：
2022-10
影响因子：
8.6
通讯作者：
Tingting Wu;Zhaoxing Lin;Yi Zhang;N. Kanazawa;T. Komiyama;Chunhong Zhu;E. Kikuchi;Jian Shi;Ruilu Liang
中科院分区：
文献类型：
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作者：
Tingting Wu;Zhaoxing Lin;Yi Zhang;N. Kanazawa;T. Komiyama;Chunhong Zhu;E. Kikuchi;Jian Shi;Ruilu Liang
采用超声辅助真空过滤技术，制备了高稳定性的多壁碳纳米管(MWCNT)复合膜修饰的聚-N-苯甘氨酸(PNPG)。结果表明，MWCNT通过非共价作用与PNPG结合。在pH=1的酸性Au(III)溶液中吸附24 h后，PNPG@MWCNT复合膜对Au(III)的吸附效率比纯PNPG膜高约20%。在pH=1的酸性Au(III)溶液中，PNPG@MWCNT复合膜对Au(III)的吸附容量达到1262.6 mg g−1，拟二级动力学模型和朗缪尔等温模型表明吸附过程主要为化学吸附和单层吸附。更重要的是，表征数据证实了复合膜与Au(III)之间的吸附机理包括静电作用和氧化还原反应，从而促进了PNPG向MWCNT的电子转移。此外，PNPG@MWCNT复合膜在废旧电路板浸出液中的竞争吸附、重复性和金回收实验结果表明，PNPG@MWCNT复合膜在回收金的实际应用中具有潜力。
Poly-N-phenylglycine (PNPG) decorated with multi-walled carbon nanotube (MWCNT) composite membranes having high stability was easily prepared using ultrasound-aided vacuum-assisted filtration. The results showed that MWCNT bound to PNPG through non-covalent interactions. The PNPG@MWCNT composite membrane with a mass composition of P3.5M0.5 showed an approximately 20% higher adsorption efficiency than the pure PNPG membrane after 24 h adsorption in acidic Au(III) solution with pH = 1. The Au(III) adsorption capacity reached 1262.6 mg g−1at pH 1, and the well-fitted pseudo-second-order kinetic and Langmuir isothermal models indicated that the adsorption process was mainly chemisorption and monolayer adsorption. More importantly, characterization data confirmed that the adsorption mechanism between the composite membrane and Au(III) included electrostatic interactions and redox reactions, thus electron transfer from PNPG to MWCNT promoted the adsorption capacity. Furthermore, the results of all competitive adsorption, repeatability, and gold recovery experiments in the leaching solution of waste printed circuit boards demonstrated the potential of the PNPG@MWCNT composite membrane in practical applications of gold recovery.