Facile Synthesis and Integration of Poly(vinyl alcohol) Sponge-Supported Metal Nanocatalysts on a Microfluidic Chip Enable a New Continuous Flow Multireactor Nanocatalysis Platform for High Efficiency and Reusability Catalysis
Facile Synthesis and Integration of Poly(vinyl alcohol) Sponge-Supported Metal Nanocatalysts on a Microfluidic Chip Enable a New Continuous Flow Multireactor Nanocatalysis Platform for High Efficiency and Reusability Catalysis
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DOI：
10.1021/acssuschemeng.2c02060
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发表时间：
2022-07-29
影响因子：
8.4
通讯作者：
Li, XiuJun
中科院分区：
文献类型：
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作者：
Hu, Kaiqiang;Ma, Lei;Li, XiuJun
在连续流微流控多反应器装置上构建了一种新型聚乙烯醇（PVA）海绵负载纳米催化平台，用于高效、高重复使用的环境污染物催化降解。采用简单的改进浸渍自组装方法制备了PVA海绵负载金属纳米颗粒催化剂（MNPs/PVA），无需进行复杂的表面修饰。将MNPs/PVA催化剂进一步集成在多反应器微流控装置上，形成连续流反应器平台（MNPs/PVA/芯片），实现两种不同纳米催化剂对污染物的同时催化降解。在连续流微流控多反应器平台上，以对硝基酚（4-NP）为模型有机污染物，对AuNPs/PVA和CoNPs/PVA的催化活性进行了评价。两种催化剂都表现出了出色的催化效率（例如，新鲜催化剂的催化效率为100%），MNPs和PVA之间的强相互作用确保了高的可重复使用性（例如，bbb20循环）。经过20次循环催化后，最优催化剂AuNPs/PVA仍保持97.6%的高催化效率。与AuNPs/PVA-5相比，性价比高的CoNPs/PVA催化剂在前10个循环中表现出相似的催化性能，而AuNPs/PVA在长期使用中表现出更好的稳定性。因此，这种结合多孔材料支撑的纳米催化剂和微流控装置优点的连续流催化平台在各种具有成本效益的环境研究和实际应用方面具有巨大的潜力。
A new poly(vinyl alcohol) (PVA) sponge-supported nanocatalysis platform on a continuous-flow microfluidic multi reactor device was constructed for high-efficiency and high reusability catalytic degradation of environmental pollutants. PVA sponge-supported metal nanoparticle catalysts (MNPs/PVA) were prepared by a simple improved impregnation self-assembly method, without any complicated surface modification. The MNPs/PVA catalysts were further integrated on a multireactor microfluidic device to form a continuous flow (CF) reactor platform (MNPs/PVA/chip) for simultaneous catalytic degradation of pollutants with two different nanocatalysts. After condition and catalyst optimizations, the catalytic activities of AuNPs/PVA and CoNPs/PVA were evaluated on this continuous flow microfluidic multireactor platform, by using p-nitrophenol (4-NP) as a model organic pollutant. Both catalysts exhibited outstanding catalytic efficiency (e.g., 100% for fresh catalysts), and the strong interactions between MNPs and PVA ensured high reusability (e.g., >20 cycles). After 20 cycles of catalysis, the optimal catalyst AuNPs/PVA still maintained a high catalytic efficiency of 97.6%. Compared to AuNPs/PVA-5, the cost-effective CoNPs/PVA catalyst exhibited similar catalytic performance within the first 10 cycles, while AuNPs/PVA showed better stability for long-term use. Hence, this continuous flow catalytic platform that combines the advantages of porous material-supported nanocatalysts with microfluidic devices has tremendous potential for various cost-effective environmental research and practical applications.