Surface modification effects in phase change material-infiltrated attapulgite

Shi, Junbing; Li, Min

doi:10.1016/j.matchemphys.2020.123521

Cited by 38 publications

(12 citation statements)

References 48 publications

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“…A wide peak appeared at 3401 cm –1 for all the samples, which is due to the tensile vibration of O–H. In the FT-IR spectrum of AT, the unsymmetric stretching vibration peak of Si–O–Si appeared at 1032 cm –1 , while the peak at 800 cm –1 is ascribed to the symmetric stretching vibration of Si–O. , In the case of AT–NH 2 , new peaks at 2932 and 2866 cm –1 were recorded, which are attributed to the asymmetric and symmetric stretching vibration of C–H, respectively. , The peak at 1552 cm –1 is assigned to the in-plane bending vibration of N–H . These results indicate that the APTES has successfully grafted onto the attapulgite surface. , In the FT-IR spectrum of GO, there are three main absorption bands observed in the spectrum.…”

Section: Resultsmentioning

confidence: 85%

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Preparation of Graphene Oxide/Attapulgite Composites and Their Demulsification Performance for Oil-in-Water Emulsion

Liu

Zhong

et al. 2021

Energy Fuels

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In this study, attapulgite (AT) and graphene oxide (GO) nanosheets were grafted together via a silane coupling agent to synthesize attapulgite−graphene oxide (AT−GO) composites and apply them to remove the emulsified oil from the oily wastewater. The structure and morphology of the AT−GO composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, zeta potential measurements, and transmission electron microscopy. The amphiphilicity of the AT−GO composites was evaluated by visual observation of their distribution in the oil−water mixture. The results showed that the AT−GO composites have been successively prepared and have good amphiphilic and interfacial activity. The effects of the pH, demulsifier dosage, temperature, and the mass ratio of AT and GO (R A/G ) in the composites on the demulsification performance of AT−GO were studied. It was found that the demulsification process could be completed efficiently and quickly at room temperature. Under optimal demulsification conditions, the demulsification efficiency is above 95%. The demulsification mechanism was studied and discussed. It is believed that the interaction behavior between the AT−GO material and the emulsified molecules of asphaltenes is a key for the demulsification. Once the nanoparticles are combined with the emulsified molecules, the external stirring, vibration, and other mechanical actions provide them enough kinetic energy to destroy the protective film at the oil/water interface and then promote the merging of dispersed oil droplets to realize the oil−water separation.

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Section: Resultsmentioning

confidence: 85%

“…17,31 The peak at 1552 cm −1 is assigned to the in-plane bending vibration of N−H. 32 These results indicate that the APTES has successfully grafted onto the attapulgite surface. 23,33 In the FT-IR spectrum of GO, there are three main absorption bands observed in the spectrum.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

Preparation of Graphene Oxide/Attapulgite Composites and Their Demulsification Performance for Oil-in-Water Emulsion

Liu

Zhong

et al. 2021

Energy Fuels

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“…The pores in natural porous minerals can be used to encapsulate PCMs. Diatomite, , expanded vermiculite, , perlite, , bentonite, attapulgite, and montmorillonite are widely used as porous substrates, and the encapsulation ratio is limited by the pores of the minerals themselves. Some researchers adjusted the pore structures of minerals to encapsulate more PCMs. , For example, Yang et al used acid leaching and organic intercalation to treat expanded vermiculite.…”

Section: Introductionmentioning

confidence: 99%

“…Diatomite, , expanded vermiculite, , perlite, , bentonite, attapulgite, and montmorillonite are widely used as porous substrates, and the encapsulation ratio is limited by the pores of the minerals themselves. Some researchers adjusted the pore structures of minerals to encapsulate more PCMs. , For example, Yang et al used acid leaching and organic intercalation to treat expanded vermiculite. The modified vermiculite encapsulated paraffin was used to increase the latent heat of the ss-CPCMs from 109.3 to 139.4 kJ/kg compared with that of expanded vermiculite.…”

Section: Introductionmentioning

confidence: 99%

“…Some researchers adjusted the pore structures of minerals to encapsulate more PCMs. 30,32 For example, Yang et al 33 used acid leaching and organic intercalation to treat expanded vermiculite. The modified vermiculite encapsulated paraffin was used to increase the latent heat of the ss-CPCMs from 109.3 to 139.4 kJ/kg compared with that of expanded vermiculite.…”

Section: ■ Introductionmentioning

confidence: 99%

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Surface Adsorption in PEG/Hydroxyapatite and PEG/Dickite Composite Phase Change Materials

et al. 2021

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The traditional view is that the pore structure of substrate determines the encapsulation ratio. The work proposed that surface adsorption was also a cause in this method. Polyethylene glycol/hydroxyapatite (PEG/HAP) and polyethylene glycol/dickite (PEG/D) were prepared by encapsulating polyethylene glycol (PEG) with hydroxyapatite (HAP) and dickite as substrates. The pore structures of HAP and dickite were characterized by BET and mercury intrusion porosimetry, respectively. Through SEM, XPS, FT-IR, and XRD, the process of PEG being encapsulated by the two materials was studied. The leakage cycle test was performed on PEG/HAP. The experiments proved that HAP adsorbed PEG through the surface and the surface adsorption played an essential role in the direct impregnation process. According to the distribution of PEG among HAP particles and the adsorption mechanism of HAP, a model was created to describe the encapsulation ratio in the direct impregnation process. The maximum encapsulation ratio of PEG/HAP calculated by this model is 75.98%, which is close to the actual value (74.66%).

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Functionalized Nanocomposite Gel Polymer Electrolyte with Strong Alkaline‐Tolerance and High Zinc Anode Stability for Ultralong‐Life Flexible Zinc–Air Batteries

et al. 2022

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Increasing pursuit of next‐generation wearable electronics has put forward the demand of reliable energy devices with high flexibility, durability, and enhanced electrochemical performances. Flexible aqueous zinc–air batteries (FAZABs) have attracted great interests owing to the high energy density, safety, and environmental benignity, for which quasi‐solid‐state gel polymer electrolytes (QSGPEs) are state‐of‐the‐art electrolytes with high ionic conductivity, flexibility, and resistance to leakage problems of traditional liquid electrolytes. Compared to commonly used PVA–KOH electrolyte with poor electrolyte retention capability and cycling stability, a new type of sulfonate functionalized nanocomposite QSGPE is applied in FAZABs with high ionic conductivity, strong alkaline tolerance, and high zinc anode stability. Notably, the existence of (1) strong anionic sulfonate groups of QSGPEs, contributing to the exposure of preferred Zn (002) plane that is more resistant to zinc dendrite formation, and (2) nano‐attapulgite electrolyte additives, beneficial for the enhancement of ionic conductivity, electrolyte uptake, and retention capability, endows a ultralong cycling life of 450 h for the fabricated FAZAB. Furthermore, flexible energy belts and knittable energy wires fabricated with a series/parallel unit of several FAZABs can be used to power various wearable electronics.

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Surface modification effects in phase change material-infiltrated attapulgite

Cited by 38 publications

References 48 publications

Preparation of Graphene Oxide/Attapulgite Composites and Their Demulsification Performance for Oil-in-Water Emulsion

Preparation of Graphene Oxide/Attapulgite Composites and Their Demulsification Performance for Oil-in-Water Emulsion

Surface Adsorption in PEG/Hydroxyapatite and PEG/Dickite Composite Phase Change Materials

Functionalized Nanocomposite Gel Polymer Electrolyte with Strong Alkaline‐Tolerance and High Zinc Anode Stability for Ultralong‐Life Flexible Zinc–Air Batteries

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