Heavy metal removal using structured sorbents 3D printed from carbon nanotube-enriched polymer solutions
Heavy metal removal using structured sorbents 3D printed from carbon nanotube-enriched polymer solutions
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DOI：
10.1016/j.matt.2022.07.012
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发表时间：
2022-08
期刊：
影响因子：
18.9
通讯作者：
Jialing Xu;Cheryl Slykas;Adam S. Braegelman;Kevin Gabriel Alvarez;Thomas Kasl;B. Boudouris;M. Webber;V. Sharma;W. Phillip
中科院分区：
文献类型：
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作者：
Jialing Xu;Cheryl Slykas;Adam S. Braegelman;Kevin Gabriel Alvarez;Thomas Kasl;B. Boudouris;M. Webber;V. Sharma;W. Phillip
吸附剂的结构在分子通过设备规模定制，以满足分离的需求，可以从复杂的混合物中分离痕量分析物。在这里，直接墨水写入三维（3D）打印与表面偏析和蒸汽诱导相分离（SVIPS）过程相结合，以创建满足此标准的分层结构吸附剂。复合油墨含有聚砜，聚苯乙烯-嵌段-聚（丙烯酸）（PS-PAA），和碳纳米管（CNT）的配制，使这些过程同时进行。用碳纳米管富集油墨可以调节其流变特性，从而可以打印渗透率为105L m-2h-1bar-1的微结构吸附剂。SVIPS工艺产生了PAA内衬纳米孔的互连网络，其化学性质被定制为生产吸附剂，该吸附剂从Co2+和Li+的混合物中选择性地回收Co2+，并在动态流动条件下有效地处理了百万分之几的进料溶液。3D打印和SVIPS的多功能组合为制造下一代吸附剂提供了新的策略，这些吸附剂具有跨多个长度尺度控制的结构。
Sorbents with structures tailored at the molecular through device scales are needed to meet the demand for separations that can isolate trace analytes from complex mixtures. Here, direct-ink-writing three-dimensional (3D) printing is combined with a surface-segregation and vapor-induced phase separation (SVIPS) process to create hierarchically structured sorbents that satisfy this criterion. Composite inks containing polysulfone, polystyrene-block-poly(acrylic acid) (PS-PAA), and carbon nanotubes (CNTs) were formulated to allow these processes to proceed simultaneously. Enriching the inks with CNTs modulated their rheological characteristics such that microstructured sorbents with permeabilities of ∼105L m−2h−1bar−1could be printed. The SVIPS process generated an interconnected network of PAA-lined nanopores whose chemistry was tailored to produce sorbents that recovered Co2+selectively from mixtures of Co2+and Li+and efficiently treated sub-parts per million feed solutions under dynamic flow conditions. The versatile combination of 3D printing and SVIPS provides new strategies for manufacturing next-generation sorbents with structures controlled across multiple length scales.