Key role of pore size in Cr(VI) removal by the composites of 3-dimentional mesoporous silica nanospheres wrapped with polyaniline

Li, Jiacheng; Li, Miao; Wang, Qianqian; Xu, Yang; Liu, Fang; Liu, Xiang

doi:10.1016/j.scitotenv.2020.139009

Cited by 30 publications

(8 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All the prepared photocatalysts showed a higher pore volume reading ranging from 0.22 to 0.26 cm 3 .g −1 , compared to the pore volume of bare TiO 2 at 0.14 cm 3 .g −1 . Bare TiO 2 was also made up of smaller pore diameters at 9 nm than other photocatalyst composites, ranging from 19.20 to 21.08 nm, and these observations were proven by the type IV isotherm, which belonged to a mesoporous structure with pore size ranging from 2 to 50 nm (Li et al 2020). A decrease in pore diameters with increasing WO 3 amount suggested that at a high WO 3 amount, WO 3 may block the pores of TiO 2 (Ismail et al 2016).…”

Section: Textural Propertiesmentioning

confidence: 82%

Photodegradation assessment of RB5 dye by utilizing WO3/TiO2 nanocomposite: a cytotoxicity study

Chau

Lee

Pang

et al. 2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

Textile dyeing wastewater becomes one of the root causes of environmental pollution. Titanium dioxide (TiO 2 ) is one of the photocatalysts that shows prominent organic dye photodegradation ability. In this study, a porous tungsten oxide (WO 3 )/ TiO 2 composite was prepared through ultrasonic-assisted solvothermal technique with varying amounts of WO 3 ranging from 0.25 to 5 weight % (wt.%). The prepared 0.50 wt.% WO 3 /TiO 2 (0.50WTi) composite exhibited the highest photodegradation activity (4.39 × 10 −2 min −1 ) and complete mineralization in chemical oxygen demand (COD) reading towards 30 mg.L −1 of Reactive Black 5 (RB5) dye under 60 min of light irradiation. Effects of large surface area, small crystallite size, high pore volume and size, and low electron-hole pair recombination rate attributed to the superiority of 0.50WTi. Besides, 0.50WTi could be reused, showing 86.50% of RB5 photodegradation at the fifth cycle. Scavenger study demonstrated that photogenerated hole (h + ) was the main active species of 0.50WTi to initiate the RB5 photodegradation. Cytotoxicity assessment determined the readings of half-maximal inhibitory concentration (IC 50 ) were 1 mg.mL −1 and 0.61 mg.mL −1 (24 and 72 h of incubations) for the 0.50WTi composite.

show abstract

Section: Textural Propertiesmentioning

confidence: 82%

Photodegradation assessment of RB5 dye by utilizing WO3/TiO2 nanocomposite: a cytotoxicity study

Chau

Lee

Pang

et al. 2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

show abstract

“…Ubiquitous ions in the water body usually pose a significant challenge to the removal performance of adsorbent materials. , The effects of various anions (i.e., chloride, nitrate, sulfate, and phosphate) and cations (calcium and magnesium ion) on Cr(VI) removal by EDA@CMPS were explored. Figure S6a illustrates that all of the coexisting anions exhibited a certain inhibitory effect on Cr(VI) removal, and it is positively correlated with their concentrations, implying that the increase of ionic strength inhibited the removal of Cr(VI).…”

Section: Resultsmentioning

confidence: 99%

Simultaneously Sequestrating and Reducing Bichromate by the Built-in Ethylenediamine Group inside Polystyrene Adsorbent

Hong

Liu

et al. 2023

ACS EST Eng.

View full text Add to dashboard Cite

Simultaneous sequestration and reduction of bichromate [Cr(VI)] poses an attractive and practical fashion for treating Cr(VI)-contaminated wastewater, for it not only immobilizes the pollutant but also reduces its toxicity. To this end, an EDA-functionalized adsorbent (EDA@CMPS) was developed with a simple one-step method by integrating ethylenediamine (EDA, a reversible redox unit) onto the skeleton of chloromethylated polystyrene adsorbent (CMPS), and it can sequestrate Cr(VI) and in situ reduce Cr(VI) to Cr(III), which was then immediately locked inside the adsorbent phase. Batch experiments confirmed that EDA@CMPS had a high removal capacity toward Cr(VI) (419 mg/g, at 25 °C), a large proportion of which was reduced to Cr(III) without leaking into the aqueous phase at pH ≥ 2. Ubiquitous anions (Cl–, NO3 –, SO4 2–, and H2PO4 –) and cations (Mg2+ and Ca2+) have a certain effect on the removal efficiencies, but EDA@CMPS still demonstrated satisfied Cr(VI) removal even with the competing ions at 100-times higher concentration. FT-IR and XPS analyses revealed that the amine group of EDA was responsible for sequestrating and reducing Cr(VI), where the amine group was oxidized into an imine group, which then played a key role in immobilizing the generated Cr(III) via chelation. Attractively, even under neutral conditions, EDA@CMPS also demonstrated decent removal and reduction performance toward Cr(VI). Furthermore, the yielded imine group can be perfectly restored to an amine group by simple alkali-acid treatment. Repeated removal–regeneration cycles verified the reusability of EDA@CMPS in treating Cr(VI) solution. Fixed-bed column experiments and treatment of a real electroplating wastewater further validated the potential of EDA@CMPS in treating Cr(VI) wastewater for practical application.

show abstract

“…Under the irradiation of light, freemoving carriers can be formed on the polyaniline's own molecular chain, and when polyaniline is compounded with other semiconductor materials for photocatalysis, the charge transfer is promoted, resulting in less electron-hole complexation and thus improved photocatalytic activity. 24,25 Chen et al prepared PANI/MIL-88A(Fe) (Px@M88) composites and the photocatalytic reduction efficiency of P9@M88 for Cr(VI) was proposed and verified to be 3.5 times higher than that of MIL-88A(Fe). 26 In this study, a-Fe 2 O 3 was first prepared from b-FeOOH precursors at different annealing treatment temperatures, and the effect of annealing temperature on the methylene blue (MB) removal of a-Fe 2 O 3 under visible light Fenton conditions was studied.…”

Section: Fe(ii) + H 2 O 2 -Fe(iii) + Oh + Oh àmentioning

confidence: 99%

“…Under the irradiation of light, free-moving carriers can be formed on the polyaniline's own molecular chain, and when polyaniline is compounded with other semiconductor materials for photocatalysis, the charge transfer is promoted, resulting in less electron–hole complexation and thus improved photocatalytic activity. 24,25 Chen et al prepared PANI/MIL-88A(Fe) (Px@M88) composites and the photocatalytic reduction efficiency of P9@M88 for Cr( vi ) was proposed and verified to be 3.5 times higher than that of MIL-88A(Fe). 26…”

Section: Introductionmentioning

confidence: 99%

Synthesis of rod-like PANI/α-Fe₂O₃composite catalysts with excellent photo-Fenton catalytic performance

et al. 2023

View full text Add to dashboard Cite

show abstract

Key role of pore size in Cr(VI) removal by the composites of 3-dimentional mesoporous silica nanospheres wrapped with polyaniline

Cited by 30 publications

References 69 publications

Photodegradation assessment of RB5 dye by utilizing WO3/TiO2 nanocomposite: a cytotoxicity study

Photodegradation assessment of RB5 dye by utilizing WO3/TiO2 nanocomposite: a cytotoxicity study

Simultaneously Sequestrating and Reducing Bichromate by the Built-in Ethylenediamine Group inside Polystyrene Adsorbent

Synthesis of rod-like PANI/α-Fe₂O₃composite catalysts with excellent photo-Fenton catalytic performance

Contact Info

Product

Resources

About

Key role of pore size in Cr(VI) removal by the composites of 3-dimentional mesoporous silica nanospheres wrapped with polyaniline

Cited by 30 publications

References 69 publications

Photodegradation assessment of RB5 dye by utilizing WO3/TiO2 nanocomposite: a cytotoxicity study

Photodegradation assessment of RB5 dye by utilizing WO3/TiO2 nanocomposite: a cytotoxicity study

Simultaneously Sequestrating and Reducing Bichromate by the Built-in Ethylenediamine Group inside Polystyrene Adsorbent

Synthesis of rod-like PANI/α-Fe2O3composite catalysts with excellent photo-Fenton catalytic performance

Contact Info

Product

Resources

About

Synthesis of rod-like PANI/α-Fe₂O₃composite catalysts with excellent photo-Fenton catalytic performance