Low-cost novel silica@polyacrylamide composites: fabrication, characterization, and adsorption behavior for cadmium ion in aqueous solution

Hu, Xin‐Sheng; Luo, Xuanping; Xiao, Gongkui; Yu, Qian; Cui, Yuanyuan; Zhang, Gang; Zhang, Rui; Liu, Yang; Zhou, Yefeng; Zeng, Zhaogang

doi:10.1007/s10450-020-00225-4

Cited by 24 publications

(8 citation statements)

References 55 publications

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“…Therefore, it can be proved that AR73 molecule has been adsorbed on the surface of CTS-sep. The Si-O-Si asymmetric stretching vibration band of 980-1190 cm −1 is found in CTS-sep/AR73@SiO2 [22,47]. The TEOS (Figure 11h) shows three absorption bands: at around 1090, 805 and 470 cm -1 [48],…”

Section: Structural Characterisation Of Cts-sep/ar73 and Cts-sep/ar73@sio2 Pigmentsmentioning

confidence: 92%

Preparation of Acid Red73 adsorbed on chitosan-modified sepiolite with SiO2 coating as a highly stable hybrid pigment

Feng

Fei

et al. 2021

Dyes and Pigments

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Section: Structural Characterisation Of Cts-sep/ar73 and Cts-sep/ar73@sio2 Pigmentsmentioning

confidence: 92%

Preparation of Acid Red73 adsorbed on chitosan-modified sepiolite with SiO2 coating as a highly stable hybrid pigment

Feng

Fei

et al. 2021

Dyes and Pigments

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“…Understanding two-phase and multiphase mixing is of great practical significance to effectively improve mixing efficiency and save production costs . There exist a lot of application examples for gas–liquid systems, such as low-cost gas/ion adsorbents. − The main purpose of gas–liquid mixing is to increase the interfacial area between gas and liquid phases, which enhances the mass/heat transfer rate and the chemical reaction rate. , A static mixer as a newly developed reaction equipment with high-efficiency mixing has the characteristics of convenient operation and maintenance, low energy consumption, better sealing, and no mechanical stirring systems. , It can increase the mixing efficiency and reaction uniformity of the gas–liquid two-phase to further improve production techniques and reduce energy consumption costs. However, different flow patterns have different effects on the gas–liquid uniformity.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Turbulence Characteristics of Gas–Liquid Pressure Fluctuations in an Industrial Quatro Static Mixer

Yu,

Li,

Meng

et al. 2024

Ind. Eng. Chem. Res.

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The gas−liquid two-phase flow is of great significance to industrial production. The nonlinear turbulence characteristics of pressure fluctuation in a Quatro static mixer (QSM) are experimentally investigated under different superficial gas/liquid velocities to further study the flow characteristics of the gas−liquid two-phase. It is shown that there is a generalized self-similarity scaling law in the QSM, which is obtained by fitting the structure function of pressure fluctuation signals at different inlet and outlet flow velocities. Through self-similarity scaling law analysis, the scaling exponent parameters of the structure function of two-phase flow pressure fluctuation under apparent liquid velocity (U L ) = 0.028 m/s and different apparent gas velocities (U G ) in QSM are calculated. The calculation results show that the singular scaling exponent (γ) and intermittency parameter (β) are in the ranges of −0.142−0.311 and 0.286−0.966, respectively. This indicates that there exists an extended self-similarity scaling law in QSM under a low Reynolds number (Re). The R/S and autocorrelation analysis reveal that the detailed signals at the inlet and outlet have three similar flow behaviors, which consist of the liquid turbulence at the inlet, the bubble movement, breakup and coalescence, and the liquid swirling flow. The nonlinear analysis shows that flow in QSM presents a pseudohomogeneous flow pattern when the Hurst index (H) = 0.4−0.6, while it presents a heterogeneous flow pattern when H = 0.6−0.72. Support vector machine (SVM) and Random Forest models (RF) are utilized to better predict the flow pattern, with the recognition precision reaching 99.08 and 99.39%, respectively.

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“…Various materials, including layered double hydroxides (LDHs), MgO, CaO, and alkali ceramic-based materials, have been extensively investigated as adsorbents in SEWGS processes (Wang et al, 2014). The adsorption materials of N-functionalized solid adsorbents (Hu et al, 2020a;Hu et al, 2020b) exhibit very high CO 2 adsorption capacities such as 1.65 mmol CO 2 /g at 35 °C with the acid-modified sepiolite with 0.8 g-diethylenetriamine loading (Liu et al, 2018). However, these adsorbents are not suitable for high temperature use due to amine degradation.…”

Section: Introductionmentioning

confidence: 99%

Stability of potassium-promoted hydrotalcites for CO2 capture over numerous repetitive adsorption and desorption cycles

Xin,

Boon,

van Dijk

et al. 2024

Front. Chem. Eng.

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Hydrotalcite-based adsorbents have demonstrated their potential for CO2 capture, particularly in the sorption-enhanced water-gas shift (SEWGS) process. This study aims to investigate the long-term stability of a potassium-promoted hydrotalcite-based adsorbent (KMG30) over many repetitive cycles under various operating conditions. The stability of the adsorbent, both in terms of its structure and sorption capacity, is examined through multiple consecutive adsorption and desorption cycles. However, it is observed that the capacity for CO2 adsorption decreases when subjected to many repeated cycles of CO2 adsorption followed by N2 flushing, or to many repeated cycles of H2O adsorption followed by N2 flushing. In-depth investigations employing various techniques such as thermogravimetric experiments, XRD, BET, and SEM-EDX analyses were conducted to elucidate the underlying phenomena that can explain this observed behavior. The former can be attributed to aggregation of K2CO3 from the sorbent during the CO2 adsorption and N2 flushing cycles (which can be reversed by re-dispersing the K2CO3 either by exposure to air or by processing the sorbent with cycles of CO2/H2O adsorption followed by N2 flushing), whereas the latter is ascribed to the only partial regeneration of the reactive site (referred to site C in earlier work), most likely associated with K2CO3 modification on MG30. In this case, morphological changes were found to be insignificant. Remarkable stability of KMG30, as known from SEWGS process studies, was confirmed during cycles of CO2 adsorption/steam purge. These findings significantly enhance our understanding of the stability of potassium-promoted hydrotalcite-based adsorbents and provide valuable insights for the design of diverse sorption processes.

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Low-cost novel silica@polyacrylamide composites: fabrication, characterization, and adsorption behavior for cadmium ion in aqueous solution

Cited by 24 publications

References 55 publications

Preparation of Acid Red73 adsorbed on chitosan-modified sepiolite with SiO2 coating as a highly stable hybrid pigment

Preparation of Acid Red73 adsorbed on chitosan-modified sepiolite with SiO2 coating as a highly stable hybrid pigment

Multiscale Turbulence Characteristics of Gas–Liquid Pressure Fluctuations in an Industrial Quatro Static Mixer

Stability of potassium-promoted hydrotalcites for CO2 capture over numerous repetitive adsorption and desorption cycles

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