Fluorescent chitosan-based hydrogel incorporating titanate and cellulose nanofibers modified with carbon dots for adsorption and detection of Cr(VI)

Luo, Qiu‐Yan; Huang, Xiaohui; Luo, Yonghong; Yuan, Hanmeng; Ren, Tingting; Li, Xianjun; Xü, Dong; Guo, Xin; Wu, Yiqiang

doi:10.1016/j.cej.2020.127050

Cited by 124 publications

(33 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, an obvious characteristic band (1048 cm −1 ) closely related to cellulose species was found in both CN and CNCD[24]. The appearance of an absorption band at 1649 cm -1 associated with -CO-NH-stretching vibrations confirmed that CD was grafted onto the CN[19]. Furthermore, the FTIR spectrum of CS/CNCD composite hydrogel contained several bands that differed from those of CS and CNCD.…”

mentioning

confidence: 85%

“…This hydrogel had a 3D porous structure, which improved swelling ability (swelling ratio of 129 g/g for deionized water at 25 • C). Using the crosslinking reaction, a 3D porous structure was required, and CD was wrapped [19]. Pore characteristics of the CS/CNCD composite hydrogel were evaluated in Figure S4, and the BET surface area and average pore width were 16.76 m 2 /g and 6.375 nm, respectively.…”

Section: Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Effective Adsorption and Sensitive Detection of Cr(VI) by Chitosan/Cellulose Nanocrystals Grafted with Carbon Dots Composite Hydrogel

Zeng

Peng

et al. 2021

Polymers

View full text Add to dashboard Cite

Due to its lethal effect on the human body and other creatures, Cr(VI) ions have attained widespread public attention, and an effective adsorbent for removing Cr(VI) ions is vital. Chitosan (CS)/cellulose nanocrystals grafted with carbon dots (CNCD) composite hydrogel with strong sorption ability and sensitive detection ability for Cr(VI) was formed. The cellulose nanocrystals (CN) offered a natural skeleton for assembling 3D porous structures, and then improved the sorption ability for Cr(VI); moreover, carbon dots (CD) acted as a fluorescent probe for Cr(VI) and provided Cr(VI) adsorption sites. With a maximum adsorption capacity of 217.8 mg/g, the CS/CNCD composite hydrogel exhibited efficient adsorption properties. Meanwhile, with a detection limit of 0.04 μg/L, this hydrogel was used for selective and quantitative detection of Cr(VI). The determination of Cr(VI) was based on the inner filter effect (IFE) and static quenching. This hydrogel retained its effective adsorption ability even after four repeated regenerations. Furthermore, the economic feasibility of the CS/CNCD composite hydrogel over activated carbon was confirmed using cost analysis. This study provided one new method for producing low-cost adsorbents with effective sorption and sensitive detection for Cr(VI).

show abstract

mentioning

confidence: 85%

Section: Characterizationmentioning

confidence: 99%

Effective Adsorption and Sensitive Detection of Cr(VI) by Chitosan/Cellulose Nanocrystals Grafted with Carbon Dots Composite Hydrogel

Zeng

Peng

et al. 2021

Polymers

View full text Add to dashboard Cite

show abstract

“…In order to purify wastewater, the research on efficient adsorbents for various pollutants has attracted the attention of researchers [1][2][3][4][5]. Bentonite, a non-metallic mineral with montmorillonite as the main mineral component, is a layered aluminosilicate clay mineral.…”

Section: Introductionmentioning

confidence: 99%

Phenol Adsorption Mechanism of Organically Modified Bentonite and Its Microstructural Changes

Qiu

et al. 2022

Sustainability

View full text Add to dashboard Cite

Bentonite was modified with cetyltrimethylammonium bromide (CTAB). The organically modified bentonite (OMB) was used to remove phenol from aqueous solution, the microstructural changes were characterized by X-ray diffraction (XRD) and scanning electronic microscopy (SEM), and phenol adsorption kinetic was obtained using batch adsorption test results. The results indicated that the rate of adsorption of phenol onto the OMB was positively correlated with the initial concentration, and the maximum adsorption capacity was found to be 10.1 mg/g at the initial concentration of 150 mg/L at 25 °C and pH 10. The investigations of adsorption kinetics models showed that the adsorption kinetic was better reflected by the pseudo-second-order kinetic model. Furthermore, the properties of the OMB samples with different adsorption times were obtained by SEM and XRD. The statistic analysis revealed that the pore diameter of the OMB samples decreased with the increasing adsorption time and gradually reached equilibrium.

show abstract

“…In addition, their potential to incorporate various nanomaterials into the matrix could further enrich their functions [26][27][28]. Recently, some research groups embedded QDs into hydrogel matrices to produce fluorescent hydrogels and explored their applications in analytical sensing [29][30][31]. Truskewycz incorporated carbon quantum dots into a ZnO/PVP hydrogel matrix.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Quantum Dot-Embedded Photonic Crystal Hydrogel and Its Application as Fluorescence Sensor for the Detection of Nitrite

Wang

et al. 2021

Nanomaterials

View full text Add to dashboard Cite

The development of fluorescence sensing platforms with excellent photoluminescence capabilities is of great importance for their further application. In this work, a photonic crystal structure was successfully applied to enhance the luminescence performance of fluorescent hydrogel, and the application of the obtained hydrogel as a fluorescence sensor was explored. A polystyrene photonic crystal template was constructed via vertical deposition self-assembly; then, the precursor solution containing polyethylenimine-capped CdS quantum dots (PEI-CdS QDs) and monomers filled in the gap of the template. After the polymerization process, the desired hydrogel was obtained. PEI-CdS QDs endowed the hydrogel with its fluorescence property, while interestingly, the photonic crystal structure showed a significant enhancement effect on the fluorescence-emission capability. The mechanism of this phenomenon was revealed. Moreover, this hydrogel could be used as a reusable fluorescence sensor for the detection of nitrite in water with good selectivity. The limit of detection was determined to be 0.25 μmol/L, which is much lower than the maximum limit for nitrite in drinking water.

show abstract

Fluorescent chitosan-based hydrogel incorporating titanate and cellulose nanofibers modified with carbon dots for adsorption and detection of Cr(VI)

Cited by 124 publications

References 39 publications

Effective Adsorption and Sensitive Detection of Cr(VI) by Chitosan/Cellulose Nanocrystals Grafted with Carbon Dots Composite Hydrogel

Effective Adsorption and Sensitive Detection of Cr(VI) by Chitosan/Cellulose Nanocrystals Grafted with Carbon Dots Composite Hydrogel

Phenol Adsorption Mechanism of Organically Modified Bentonite and Its Microstructural Changes

Preparation of Quantum Dot-Embedded Photonic Crystal Hydrogel and Its Application as Fluorescence Sensor for the Detection of Nitrite

Contact Info

Product

Resources

About