Zwitterionic dye rhodamine B (RhB) uptake on different types of clay minerals

Rao, Wenxiu; Piliouras, Pete; Wang, Xisen; Guido, Anthony; Kugler, Kasey; Sieren, Ben; Wang, Limin; Lv, Guocheng; Li, Zhaohui

doi:10.1016/j.clay.2020.105790

Cited by 43 publications

(10 citation statements)

References 40 publications

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“…As shown in Figure 8 , after sodium chloride (NaCl) was added into the RhB solution, the RhB adsorption capacity of PCAC slightly increased, which may be due to fact that an increase in ionic strength can weaken the electrostatic repulsion between RhB and PCAC [ 63 ]. However, in general, there were no obvious changes in RhB adsorption capacities along with the increment of ion strength, which is in agreement with the results of previous reports on the adsorption of RhB on various adsorbents [ 64 , 65 , 66 ]. This indicates that the electrostatic force between RhB and PCAC was weak [ 67 ].…”

Section: Resultssupporting

confidence: 92%

A Weed-Derived Hierarchical Porous Carbon with a Large Specific Surface Area for Efficient Dye and Antibiotic Removal

Liang

Tian

Zhang

et al. 2022

IJMS

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Adsorption is an economical and efficient method for wastewater treatment, and its advantages are closely related to adsorbents. Herein, the Abutilon theophrasti medicus calyx (AC) was used as the precursor for producing the porous carbon adsorbent (PCAC). PCAC was prepared through carbonization and chemical activation. The product activated by potassium hydroxide exhibited a larger specific surface area, more mesopores, and a higher adsorption capacity than the product activated by sodium hydroxide. PCAC was used for adsorbing rhodamine B (RhB) and chloramphenicol (CAP) from water. Three adsorption kinetic models (the pseudo-first-order, pseudo-second-order, and intra-particle diffusion models), four adsorption isotherm models (the Langmuir, Freundlich, Sips, and Redlich–Peterson models), and thermodynamic equations were used to investigate adsorption processes. The pseudo-second kinetic and Sips isotherm models fit the experimental data well. The adsorption mechanism and the reusability of PCAC were also investigated. PCAC exhibited a large specific surface area. The maximum adsorption capacities (1883.3 mg g−1 for RhB and 1375.3 mg g−1 for CAP) of PCAC are higher than most adsorbents. Additionally, in the fixed bed experiments, PCAC exhibited good performance for the removal of RhB. These results indicated that PCAC was an adsorbent with the advantages of low-cost, a large specific surface area, and high performance.

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Section: Resultssupporting

confidence: 92%

A Weed-Derived Hierarchical Porous Carbon with a Large Specific Surface Area for Efficient Dye and Antibiotic Removal

Liang

Tian

Zhang

et al. 2022

IJMS

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“…However, RhB forms a zwitterion in water with the cationic � N + (CH 3 ) 2 and anionic (−COO − ) groups. 69 Although the cationic −N + site tends to attach to the SnS 2 surface, the −COO − site detaches from the surface. Therefore, RhB shows weaker adsorption over SnS 2 than MB.…”

Section: •−mentioning

confidence: 99%

Self-Assembled p–n Homojunction in SnS₂ Nanosheets for Enhanced Visible Light-Driven Photocatalysis

Nath

Sarma

Chutia

et al. 2023

ACS Appl. Nano Mater.

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Defect engineering and hetero-interfacial bending are standard approaches for enhancing carrier separation and increasing visible light absorption in a semiconductor photocatalyst. Here, we demonstrate the evolution of sulfur vacancies (V S ) and the self-assembly of a p−n homojunction through prolonged aqueous washing of SnS 2 nanosheets. The experimental studies have validated increased hydrophilicity, layer thinning, V S generation, and extended photocarrier lifetime in washed SnS 2 nanosheets. Density functional theory has revealed the changes in the local electronic structure of SnS 2 in the presence of structural defects. An electrochemical impedance spectroscopy study has shown that V S actuates the self-assembly of a pseudo-p-type SnS layer over n-type SnS 2 to generate the p−n homojunction. The ptype carrier densities are increased twice as the number of washings is increased from 3 to 10 times. The photocatalytic efficacy of the SnS 2 homojunction is evaluated in the study of the degradation of several water contaminants under white light and monochromatic excitations. The proposed mechanism shows that the built-in electric field at the p−n junction promotes the separation of the photogenerated electrons and holes. Meanwhile, V S traps the electrons and transfers them to the catalytically reactive centers to participate in photocatalysis. Our findings demonstrate that a simple approach that involves prolonged aqueous washing of as-produced SnS 2 promotes the formation of V S and the self-assembly of a p−n homojunction in SnS 2 nanosheets with improved visible light photocatalytic performances.

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“…According to Figure S3, the isoelectric point of Ag/AgBr/AgVO 3 was 2.5. The pKa of RhB has been reported to be 3.7 . Apparently, Ag/AgBr/AgVO 3 , the CS layer and RhB molecules were positively charged at pH = 1.…”

Section: Resultsmentioning

confidence: 95%

“…The pKa of RhB has been reported to be 3.7. 40 Apparently, Ag/AgBr/AgVO 3 , the CS layer and RhB molecules were positively charged at pH = 1. The electrostatic repulsion between them decreased the adsorption capacity of the membrane, thereby reducing its photocatalytic efficiency.…”

Section: Surface Structure and Chemical Compositionmentioning

confidence: 94%

Ag/AgBr/AgVO₃ Photocatalyst-Embedded Polyacrylonitrile/Polyamide/Chitosan Nanofiltration Membrane for Integrated Filtration and Degradation of RhB

Yue

Hou

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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A nanofiltration (NF) membrane containing a NaOH-treated electrospun polyacrylonitrile (HPAN) substrate, an interfacial polymerization (IP) polyamide (PA) layer, a chitosan (CS) coating layer, and an Ag/AgBr/AgVO 3 photocatalyst loading layer was prepared. The structural evolution of the membranes was investigated, and their performance was estimated in accordance with the water flux and rejection rate. A probable mechanism for the photocatalytic activity of Ag/AgBr/AgVO 3 was proposed. The loading of the Ag/AgBr/AgVO 3 heterojunction on the HPAN/PA/CS NF membrane endowed the membrane with excellent self-cleaning properties owing to the photolytic degradation of the dye. The filtration and degradation processes of the Ag/AgBr/AgVO 3 -loaded membrane constantly promoted each other, and the treatment efficiency achieved with the integrated (filtration + degradation) process was superior to those obtained with the filtration and degradation processes alone. The Ag/AgBr/AgVO 3 -NF membrane exhibited excellent recyclability and stability when subjected to five integrated filtration−degradation processes. In addition, the Ag/AgBr/AgVO 3 -NF membrane exhibited an elastic modulus of 65.75 MPa and a toughness of 38.9 kJ/m 3 along with a good disinfection effect on Escherichia coli in visible light. The as-prepared photocatalyst-loaded NF membrane with excellent antifouling performance, antimicrobial activity, high strength, and recyclability showed potential for continuous water purification operation.

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Zwitterionic dye rhodamine B (RhB) uptake on different types of clay minerals

Cited by 43 publications

References 40 publications

A Weed-Derived Hierarchical Porous Carbon with a Large Specific Surface Area for Efficient Dye and Antibiotic Removal

A Weed-Derived Hierarchical Porous Carbon with a Large Specific Surface Area for Efficient Dye and Antibiotic Removal

Self-Assembled p–n Homojunction in SnS₂ Nanosheets for Enhanced Visible Light-Driven Photocatalysis

Ag/AgBr/AgVO₃ Photocatalyst-Embedded Polyacrylonitrile/Polyamide/Chitosan Nanofiltration Membrane for Integrated Filtration and Degradation of RhB

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Zwitterionic dye rhodamine B (RhB) uptake on different types of clay minerals

Cited by 43 publications

References 40 publications

A Weed-Derived Hierarchical Porous Carbon with a Large Specific Surface Area for Efficient Dye and Antibiotic Removal

A Weed-Derived Hierarchical Porous Carbon with a Large Specific Surface Area for Efficient Dye and Antibiotic Removal

Self-Assembled p–n Homojunction in SnS2 Nanosheets for Enhanced Visible Light-Driven Photocatalysis

Ag/AgBr/AgVO3 Photocatalyst-Embedded Polyacrylonitrile/Polyamide/Chitosan Nanofiltration Membrane for Integrated Filtration and Degradation of RhB

Contact Info

Product

Resources

About

Self-Assembled p–n Homojunction in SnS₂ Nanosheets for Enhanced Visible Light-Driven Photocatalysis

Ag/AgBr/AgVO₃ Photocatalyst-Embedded Polyacrylonitrile/Polyamide/Chitosan Nanofiltration Membrane for Integrated Filtration and Degradation of RhB