Designing hierarchical nanoporous membranes for highly efficient gas adsorption and storage

Mao, Haiyan; Tang, Jing; Wan, Jiayu; Hou, Kaipeng; Peng, Yucan; Halat, David M.; Xiao, Liangang; Wei, Fei; Lv, Xudong; Yang, Ankun; Cui, Yi; Reimer, Jeffrey A.

doi:10.1126/sciadv.abb0694

Cited by 45 publications

(34 citation statements)

References 37 publications

(46 reference statements)

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“…Ultimately, the absorption coefficient decreased with the increase of the sample thickness. At the same time, the degree of crystallinity was proportional to the terahertz absorption coefficient of cellulose, and five movement models of cellulose molecules corresponded to the five absorption peak positions of cellulose studied [26,27].…”

Section: Introductionmentioning

confidence: 91%

Novel Terahertz Spectroscopy Technology for Crystallinity and Crystal Structure Analysis of Cellulose

et al. 2020

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Crystallinity is an essential indicator for evaluating the quality of fiber materials. Terahertz spectroscopy technology has excellent penetrability, no harmful substances, and commendable detection capability of absorption characteristics. The terahertz spectroscopy technology has great application potential in the field of fiber material research, especially for the characterization of the crystallinity of cellulose. In this work, the absorption peak of wood cellulose, microcrystalline cellulose, wood nano cellulose, and cotton nano cellulose were probed in the terahertz band to calculate the crystallinity, and the result compared with XRD and FT-IR analysis. The vibration model of cellulose molecular motion was obtained by density functional theory. The results showed that the average length of wood cellulose (WC) single fiber was 300 μm. The microcrystalline cellulose (MCC) was bar-like, and the average length was 20 μm. The cotton cellulose nanofiber (C-CNF) was a single fibrous substance with a length of 50 μm, while the wood cellulose nanofiber (W-CNF) was with a length of 250 μm. The crystallinity of cellulose samples in THz was calculated as follows: 73% for WC, 78% for MCC, 85% for W-CNF, and 90% for C-CNF. The crystallinity values were obtained by the three methods which were different to some extent. The absorption peak of the terahertz spectra was most obvious when the samples thickness was 1 mm and mixed mass ratio of the polyethylene and cellulose was 1:1. The degree of crystallinity was proportional to the terahertz absorption coefficients of cellulose, the five-movement models of cellulose molecules corresponded to the five absorption peak positions of cellulose.

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Section: Introductionmentioning

confidence: 91%

Novel Terahertz Spectroscopy Technology for Crystallinity and Crystal Structure Analysis of Cellulose

et al. 2020

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“…Monomer (AM) reacts with the activated starch to form side chains attached via strong hydrogen bonding. Additionally, the presence of the –OH and C=O groups on the carbon spheres was confirmed, which may improve the hydrophilicity of CSs in water systems [ 45 , 46 ]. Therefore, during the reaction, the –OH groups can be activated and hydrogen bonded with PAM.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Novel Hybrid Flocculants Based on Potato Starch Copolymers with Hollow Carbon Spheres

2021

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Novel carbon nanofiller-based starch-g-polyacrylamide hybrid flocculation materials (St-PAM-CS) were in situ prepared using potato starch (St), acrylamide (AM), and hollow mesoporous carbon spheres (CSs; diameters of 300–400 nm). Structures of different St-PAM-CS systems were characterized by Fourier transform infrared (FTIR) spectroscopy, X-Ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), laser scanning microscopy (LSM), and particle size analysis. The flocculation tests were evaluated by removing high turbidity kaolin suspension—initial absorbance 1.84. The effect of the St to AM molar ratio, doses, and content of CSs in hybrids on flocculation efficiency were examined. Satisfactory flocculation efficiency was obtained for all hybrids with 1 wt.% of the CS component. The highest reduction of the kaolin suspension absorbance (to 0.06) was observed for a 3 mL dose of the starch hybrid with the highest AM content. Additionally, St-PAM-CS showed a reduction in the sludge volume in time. The hybrids reached better flocculation efficiency in relation to the reference systems without CSs. The proposed flocculation mechanism (considering bridging, patching, and formation of hydrogen bonds) has been confirmed by the recorded results.

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“…The microwave‐assisted method was successfully implemented for the preparation of carbon spheres. [ 113–119 ] Recently, Staciwa et al. [ 118 ] presented the synthesis of microporous carbon spheres that involved heat treatment of carbon sources and activators in a microwave‐assisted solvothermal reactor, followed by carbonization at 700 °C in a furnace.…”

Section: Microwave Synthesis Of Nanoporous Materials and Their Applicationsmentioning

confidence: 99%

“…Mao et al. [ 119 ] obtained micro–mesoporous spheres via a chemical‐microwave activation that involved impregnation with KOH and microwave heating. Carbon samples were firstly prepared by hydrothermal carbonization of cellulose (carbon source).…”

Section: Microwave Synthesis Of Nanoporous Materials and Their Applicationsmentioning

confidence: 99%

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Advances in Microwave Synthesis of Nanoporous Materials

et al. 2021

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Usually, porous materials are synthesized by using conventional electric heating, which can be energy‐ and time‐consuming. Microwave heating is commonly used in many households to quickly heat food. Microwave ovens can also be used as powerful devices in the synthesis of various porous materials. The microwave‐assisted synthesis offers a simple, fast, efficient, and economic way to obtain many of the advanced nanomaterials. This review summarizes the recent achievements in the microwave‐assisted synthesis of diverse groups of nanoporous materials including silicas, carbons, metal–organic frameworks, and metal oxides. Microwave‐assisted methods afford highly porous materials with high specific surface areas (SSAs), e.g., activated carbons with SSA ≈3100 m2 g−1, metal–organic frameworks with SSA ≈4200 m2 g−1, covalent organic frameworks with SSA ≈2900 m2 g−1, and metal oxides with relatively small SSA ≈300 m2 g−1. These methods are also successfully implemented for the preparation of ordered mesoporous silicas and carbons as well as spherically shaped nanomaterials. Most of the nanoporous materials obtained under microwave irradiation show potential applications in gas adsorption, water treatment, catalysis, energy storage, and drug delivery, among others.

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Designing hierarchical nanoporous membranes for highly efficient gas adsorption and storage

Cited by 45 publications

References 37 publications

Novel Terahertz Spectroscopy Technology for Crystallinity and Crystal Structure Analysis of Cellulose

Novel Terahertz Spectroscopy Technology for Crystallinity and Crystal Structure Analysis of Cellulose

Synthesis and Characterization of Novel Hybrid Flocculants Based on Potato Starch Copolymers with Hollow Carbon Spheres

Advances in Microwave Synthesis of Nanoporous Materials

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