Temperature dependence of aggregation behavior and dye adsorption of poly(N-isopropylacrylamide) hydrogel/mesoporous silica composites

Murakami, Kenji; Imai, Akihiko; Nakamura, Ayano

doi:10.1016/j.colsurfa.2023.131944

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…This phenomenon could be attributed to the aggregation of the porous adsorbent at higher temperatures in an aqueous solution. Such aggregation reduces the available surface area for adsorption, thereby decreasing the total amount of adsorbate that can be adsorbed 48 , 49 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of aluminosilicate and zinc silicate from sugarcane bagasse fly ash for adsorption of aflatoxin B1

Niamnuy,

Sungsinchai,

Jarernsamrit

et al. 2024

Sci Rep

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Sugarcane bagasse fly ash, a residual product resulting from the incineration of biomass to generate power and steam, is rich in SiO2. Sodium silicate is a fundamental material for synthesizing highly porous silica-based adsorbents to serve circular practices. Aflatoxin B1 (AFB1), a significant contaminant in animal feeds, necessitates the integration of adsorbents, crucial for reducing aflatoxin concentrations during the digestive process of animals. This research aimed to synthesize aluminosilicate and zinc silicate derived from sodium silicate based on sugarcane bagasse fly ash, each characterized by a varied molar ratio of aluminum (Al) to silicon (Si) and zinc (Zn) to silicon (Si), respectively. The primary focus of this study was to evaluate their respective capacities for adsorbing AFB1. It was revealed that aluminosilicate exhibited notably superior AFB1 adsorption capabilities compared to zinc silicate and silica. Furthermore, the adsorption efficacy increased with higher molar ratios of Al:Si for aluminosilicate and Zn:Si for zinc silicate. The N2 confirmed AFB1 adsorption within the pores of the adsorbent. In particular, the aluminosilicate variant with a molar ratio of 0.08 (Al:Si) showcased the most substantial AFB1 adsorption capacity, registering at 88.25% after an in vitro intestinal phase. The adsorption ability is directly correlated with the presence of surface acidic sites and negatively charged surfaces. Notably, the kinetics of the adsorption process were best elucidated through the application of the pseudo-second-order model, effectively describing the behavior of both aluminosilicate and zinc silicate in adsorbing AFB1.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of aluminosilicate and zinc silicate from sugarcane bagasse fly ash for adsorption of aflatoxin B1

Niamnuy,

Sungsinchai,

Jarernsamrit

et al. 2024

Sci Rep

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“…The effective extraction of toxic dyes 72 and heavy metals 42 from water can be achieved through the use of microgel suspensions as adsorbents, which showed remarkable efficiency in pollutant removal. Some of the most frequently removed dyes from aqueous solutions using microgel adsorbents include rhodamine-B (RB), 72 methylene blue (MBl), 73 Eosin Y (EY), 74 Congo red (CRe), 75 malachite green (MGr), 76 and methyl orange (MOr). 77 Arif et al 78 employed hydrogels composed of poly(styrene)@poly( N -isopropylmethacrylamide) P(St)@P(NIPMe) microgel system as an adsorbent for the extraction of Cu 2+ ions from aqueous solutions.…”

Section: Adsorptive Pollutant Removal By Microgels (Adsorbents)mentioning

confidence: 99%

“…Some of the most frequently removed dyes from aqueous solutions using microgel adsorbents include rhodamine-B (RB), 72 methylene blue (MBl), 73 Eosin Y (EY), 74 Congo red (CRe), 75 malachite green (MGr), 76 and methyl orange (MOr). 77 Arif et al 78 employed hydrogels composed of poly(styrene)@poly( N -isopropylmethacrylamide) P(St)@P(NIPMe) microgel system as an adsorbent for the extraction of Cu 2+ ions from aqueous solutions. They also converted the loaded copper( ii ) ions into copper nanoparticles, and then used the synthesized system as a catalyst for the reduction of different pollutants from water.…”

Section: Adsorptive Pollutant Removal By Microgels (Adsorbents)mentioning

confidence: 99%

Exploring microgel adsorption: synthesis, classification, and pollutant removal dynamics

Arif

2024

RSC Adv.

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Microgel‐Crosslinked Thermo‐Responsive Hydrogel Actuators with High Mechanical Properties and Rapid Response

Yang,

Xiao,

et al. 2024

Macromol. Rapid Commun.

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Smart hydrogels responsive to external stimuli are promising for various applications such as soft robotics and smart devices. High mechanical strength and fast response rate are particularly important for the construction of hydrogel actuators. Herein, tough hydrogels with rapid response rates were synthesized using vinyl‐functionalized poly(N‐isopropylacrylamide) (PNIPAM) microgels as macro‐crosslinkers and N‐isopropylacrylamide as monomers. The compression strength of the obtained PNIPAM hydrogels was up to 7.13 MPa. The response rate of the microgel‐crosslinked hydrogels was significantly enhanced compared with conventional chemically crosslinked PNIPAM hydrogels. The mechanical strength and response rate of hydrogels can be adjusted by varying the proportion of monomers and crosslinkers. The lower critical solution temperature (LCST) of the PNIPAM hydrogels could be tuned by copolymerizing with ionic monomer sodium methacrylate. Thermo‐responsive bilayer hydrogels were fabricated using PINPAM hydrogels with different LCSTs via a layer‐by‐layer method. The thermo‐responsive fast swelling and shrinking properties of the two layers endow the bilayer hydrogel with anisotropic structures and asymmetric response characteristics, allowing the hydrogel to respond rapidly. The bilayer hydrogels have been fabricated into clamps to grab small objects and flowers that mimicked the closure of petals, and it shows great application prospects in the field of actuators.This article is protected by copyright. All rights reserved

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Temperature dependence of aggregation behavior and dye adsorption of poly(N-isopropylacrylamide) hydrogel/mesoporous silica composites

Cited by 6 publications

References 30 publications

Synthesis and characterization of aluminosilicate and zinc silicate from sugarcane bagasse fly ash for adsorption of aflatoxin B1

Synthesis and characterization of aluminosilicate and zinc silicate from sugarcane bagasse fly ash for adsorption of aflatoxin B1

Exploring microgel adsorption: synthesis, classification, and pollutant removal dynamics

Microgel‐Crosslinked Thermo‐Responsive Hydrogel Actuators with High Mechanical Properties and Rapid Response

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