CNT@LDH functionalized poly(lactic acid) membranes with super oil–water separation and real‐time press sensing properties

Abstract

Controlling wettability is crucial to designing separation membrane with high performance. In order to achieve the goal, chain modification method is frequently utilized to optimize surface nature of raw materials. However, the development of the method is of significance but challenging due to the high processing cost and complexity. Herein, we developed a rough surface induction strategy to prepare poly(lactic acid) (PLA) membrane. Layered double hydroxides (LDH) were loaded with carboxylation carbon nanotubes (CNT), and the prepared CNT@LDH was surface modified with aminopropyltriethoxysilane. Then the CNT@LDH was blended with PLA to prepare composites and PLA electrospinning membranes. The morphology of synthesized CNT@LDH mimics "sea urchin" liked structure, which prevented the aggregation of LDH cubes, and induced an efficient conductive network. The combination of CNT@LDH greatly changed the membranes' porous structure, thermal stability, and crystallization properties. The hydrophilicity of PLA membranes increased 112.74%, whereas the pore size and fiber diameter decreased 76.43% and 79.56%, respectively. The oil absorption capacity of the composite membrane was up to 35 g/g with a high absorption speed. Meanwhile, the prepared PLA membrane had a quick response of press-sensing.This research provides a method for designing separation membranes with high separation efficiency, great selectivity, environment friendliness, and realtime pressure monitor function, which is considered as a potential material in intelligent oil-water separation or wearable electronics fields.

The Effects of Nucleating Agents and Processing on the Crystallization and Mechanical Properties of Polylactic Acid: A Review

“…The morphology of the PLA–talc crystals exhibits an epitaxial growth into a lamellar structure. Other mineral-based materials, such as mica [ 85 ], kaolinite [ 86 , 87 ], layered double hydroxides (LDHs) [ 88 , 89 , 90 , 91 ], and vermiculite (VMT) [ 92 , 93 , 94 ], can also serve as nucleating agents for PLA and affect the nucleation density and crystallization rates.…”

Photocatalytic PAN Nanofibrous Membrane through Anchoring a Nanoflower-Branched CoAl-LDH@PANI Heterojunction for Organic Hazards Degradation and Oil-Containing Emulsified Wastewater Separation

“…It is well-accepted that the photocatalytic efficiency is largely determined by the light trapping capacity of the desired photocatalyst, the rate of charge generation and recombination, the efficiency of charge separation and transfer to the catalyst surface, and the oxidation/reduction reaction rate on the catalyst surface. − Unfortunately, the LDHs photocatalysts with finite components including Mg/Fe and Ni/Co are unstable and insufficient in multiphase photocatalytic processes. − In view of this, the design of a heterojunction semiconductor catalyst based on the features of LDHs is expected to improve the carrier transmission and photocatalytic efficiency. Uniquely, the introduction of conductive polymer such as polyaniline (PANI) is one of the effective approaches to enhance the utilization rate of photon and separation rate of carrier. , On the one hand, the delocalized π–π condensed structure promotes the rapid photoinduced charge transfer.…”

Candle soot nanoparticle embedded nanofibrous membrane for separation of miscible and immiscible oil/water mixtures

“…have several demerits, such as generating secondary pollutants, low efficiency, high operating costs, low energy utilization, and poor reusability. [11][12][13][14] Membrane-based oil/water separation with profound absorption capacity is attractive among the numerous oil/water separation techniques due to its excellent removal efficiency. [15][16][17] The ability of membrane materials with adjustable porosity and pore size distribution to separate miscible oil/water mixtures (emulsions) is an advantage over sponges and aerogels that have relatively large pores.…”