A Novel Thermoresponsive Catalytic Membrane with Multiscale Pores Prepared via Vapor-Induced Phase Separation
A Novel Thermoresponsive Catalytic Membrane with Multiscale Pores Prepared via Vapor-Induced Phase Separation
复制标题
蒸汽诱导相分离制备的新型多尺度孔热响应催化膜
DOI：
10.1002/smll.201703650
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发表时间：
2018
期刊：
影响因子：
13.3
通讯作者：
Chu Liang-Yin
中科院分区：
文献类型：
--
作者：
Xie Rui;Luo Feng;Zhang Lei;Guo Shi-Fei;Liu Zhuang;Ju Xiao-Jie;Wang Wei;Chu Liang-Yin
通过在细胞孔的孔壁上构建负载银纳米颗粒（Ag NPs）的聚（N-异丙基丙烯酰胺）（PNIPAM）纳米凝胶作为热响应门和蒸汽诱导相分离催化剂，开发了一种具有多尺度孔的新型热响应催化聚醚砜膜。基于聚多巴胺的多功能粘附和还原特性，通过原位还原方法将Ag NPs稳定地固定在PNIPAM纳米凝胶上。整个膜上形成了用Ag NPs负载的PNIPAM纳米凝胶装饰的微米级细胞孔，并充当具有大孔表面的众多微反应器。所提出的膜表现出令人满意的热响应特性和稳定的催化性能。系统研究了操作温度和料液反应物浓度对催化性能的影响。结果表明，还原剂硼氢化钠（NaBH4）催化还原水中4-硝基苯酚（4-NP）的表观动力学速率常数在20~45 ℃、NaBH4与4-NP的摩尔比为100:1~500:1的范围内为3.7~37.9 min-1。当料液中反应物浓度波动时，利用膜的热响应特性，简单地调节膜的渗透率或通量，即可实现反应物的高催化转化率。
A novel thermoresponsive catalytic polyethersulfone membrane with multiscale pores is developed by constructing silver nanoparticles (Ag NPs) loaded poly(N‐isopropylacrylamide) (PNIPAM) nanogels on pore walls of cellular pores as thermoresponsive gates and catalysts via vapor‐induced phase separation. The Ag NPs are stably immobilized on the PNIPAM nanogels by an in situ reduction method based on the versatile adhesion and reduction properties of polydopamine. The micrometer cellular pores decorated with Ag NPs loaded PNIPAM nanogels are formed throughout the membrane and act as numerous microreactors with a large pore surface. The proposed membrane exhibits both satisfactory thermoresponsive characteristics and stable catalytic properties. The effects of operation temperature and reactant concentration of feed solution on the catalytic properties are investigated systematically. The results show that the apparent kinetic rate constant of catalytic reduction of 4‐nitrophenol (4‐NP) in water by reductant sodium borohydride (NaBH4), is ranging from 3.7 to 37.9 min‐1at temperatures from 20 to 45 ºC and the molar ratio of NaBH4to 4‐NP from 100:1 to 500:1. When the reactant concentration in feed solution fluctuates, the permeability or throughput of the membrane is simply adjusted by virtue of the thermoresponsive characteristics of membranes to achieve high catalytic conversion of reactant.