Surface modification of TiO2 with polydopamine and its effect on photocatalytic degradation mechanism

Sun, Xiulan; Yan, Luting; Xu, Runxiang; Xu, Mingyuan; Zhu, Yanyun

doi:10.1016/j.colsurfa.2019.03.018

Cited by 83 publications

(27 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Further, PDA is considered an adaptable platform for further functionalization with the desired functional groups for different purposes because of the presence of abundant functional groups on its surface [21,22]. Because of such unique properties over other amines, PDA has been widely utilized for the functionalization/modification of several nanomaterials like multi-walled carbon nanotubes [23], silver NPs [24], SiO 2 and TiO 2 NPs [25,26]. The amination of GO NPs using PDA was reported in some studies for anticorrosion coatings purposes [27], electrocatalysis applications [28], and sensing applications [29], too.…”

Section: Introductionmentioning

confidence: 99%

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

2021

View full text Add to dashboard Cite

High-degree functionalization of graphene oxide (GO) nanoparticles (NPs) using polydopamine (PDA) was conducted to produce polydopamine functionalized graphene oxide nanoparticles (GO-PDA NPs). Aiming to explore their potential use as nanofiller in membrane separation processes, the spectral and structural properties of GO-PDA NPs were comprehensively analyzed. GO NPs were first prepared by the oxidation of graphite via a modified Hummers method. The obtained GO NPs were then functionalized with PDA using a GO:PDA ratio of 1:2 to obtain highly aminated GO NPs. The structural change was evaluated using XRD, FTIR-UATR, Raman spectroscopy, SEM and TEM. Several bands have emerged in the FTIR spectra of GO-PDA attributed to the amine groups of PDA confirming the high functionalization degree of GO NPs. Raman spectra and XRD patterns showed different crystalline structures and defects and higher interlayer spacing of GO-PDA. The change in elemental compositions was confirmed by XPS and CHNSO elemental analysis and showed an emerging N 1s core-level in the GO-PDA survey spectra corresponding to the amine groups of PDA. GO-PDA NPs showed better dispersibility in polar and nonpolar solvents expanding their potential utilization for different purposes. Furthermore, GO and GO-PDA-coated membranes were prepared via pressure-assisted self-assembly technique (PAS) using low concentrations of NPs (1 wt. %). Contact angle measurements showed excellent hydrophilic properties of GO-PDA with an average contact angle of (27.8°).

show abstract

Section: Introductionmentioning

confidence: 99%

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

2021

View full text Add to dashboard Cite

show abstract

“…In the degradation process of Vc, species at m/z 174, 191, 136, 115 and 113 were detected; these species were attributed to C 6 H 6 O 6 , C 6 H 8 O 7 , C 4 H 6 O 5 , C 4 H 4 O 4 and C 4 H 2 O 4 . Based on these data and references, the potential degradation paths of both RhB and Vc were proposed and shown in (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of CuO Nanosheets and Efficient Degradation of Rhodamine B in a Copper Oxide/Ascorbic Acid/Hydrogen Peroxide System: Kinetics, Fate of Ascorbic Acid, and Mechanism

Xiao

Wang

et al. 2020

ChemistrySelect

View full text Add to dashboard Cite

CuO nanosheet was successfully prepared via a simple, green hydrothermal method. The resulted product was characterized by various technologies. CuO combined with trace ascorbic acid exhibited excellent Fenton-like catalytic activity for Rhodamine B degradation. 80 % of RhB degradation occurred in the first 10 min and ascorbic acid was transformed to dehydroascorbic acid at this stage. When the RhB degradation reaction ended, the mineralization of ascorbic acid commenced and finally the ascorbic acid was mineralized to CO 2 and H 2 O. The role of ascorbic acid was to accelerate the two cycles (�Cu II !�Cu III !�Cu II and �Cu I !�Cu II !�Cu I ) on the surface of CuO particles, which results in the continuous generation of abundant free radicals and rapid degradation of pollutants. The rapid degradation kinetics can be described by Behnajady-Modirshahla-Ghanbery equation. The rate constant of HO * generation was 3.7 × 10 À 2 s À 1 and the most utilization efficiency of H 2 O 2 reached 75 %. The CuO/ascorbic acid catalyst has environmentally friendly features, thereby highlighting its practical utility for wastewater treatment.

show abstract

“…Another TiO 2 preparation coated with PDA was made by stirring mixtures of TiO 2 and dopamine (2 h, rt) . The sample prepared with a 0.4 mg mL −1 suspension of TiO 2 with dopamine (1 nm layer) showing the lowest fluorescence intensity was used in the decomposition of RhB achieving 99.28 % and 77.40 % degradation in 90 min under irradiation with UV‐vis and visible light, respectively.…”

Section: Removal Of Toxic Materialsmentioning

confidence: 99%

Polydopamine – its Prolific Use as Catalyst and Support Material

Molnár

2020

ChemCatChem

View full text Add to dashboard Cite

Polydopamine is a mussel-inspired functional material with a unique ability to form surface coatings. It is a green, environmentally benign product available very easily for a multitude of varied applications. This review attempts to collect useful information with respect to polydopamine-based catalytic studies with the use of polydopamine and modified polydopamine preparations loaded with varied catalytically active species including metal ions and metal particles. Major sections are about the use of polydopamine as catalyst material, utilization of immobilized enzymes, removal of toxic materials, results in organic synthesis, and fuel cell applications. A few examples of chiral catalysis and results of recycling studies are also treated. Data collected and analyzed indicate the importance and high potential of polydopamine-based catalysts in sustainable chemistry. of subunits attacked by an immobilized cyclohexeneamine (5) was suggested to be the transition state of CÀ C bond formation.Edouard et al. prepared catalyst 0.29 % PDA/PU by depositing PDA onto polyurethane foam (PU, 180 � 20 mg, 8 cm 3 ) and used it for the reduction of methylene blue (MB) with NaBH 4 . [48] Activities decreased gradually with repeated uses from 100 % to 35 % in run 11 but partial reactivation was achieved upon keeping the sample at 67°C for 8 h (55 % dropping below 10 % in run 13). Exposure to air at room temperature for six days proved to be somewhat more beneficial (90 % conversion in run 14 decreasing to 48 % in run 18). In a recent study they fabricated two oxidized PDA/PU samples and then loaded them with NaBH 4 . [49] One made by the usual method (dopamine/Tris, rt, 12 h, in air; sample PDA O2 PU), whereas the other was made by treating PU in a mixture of dopamine, NaOAc, and NaIO 4 (pH 5, rt, 24 h). The sample was dried (67°C) and washed thoroughly with water (PDA NaIO4 PU). Both products were dipped into an aqueous solution of NaBH 4 (0.1 M, 10 min) to afford boron contents of 2.37 and 2.11 wt%. The catalysts tested in the degradation of MB showed high activities with efficiencies of 97 % and 98 %, respectively (NaBH 4 /MB molar ratio 40, 177 mg and 209 mg catalysts, 25 min). During five reuses, the pH of the reaction medium increased because of boron loss (0.78 wt% and 0.81 wt%). The activity of PDA NaIO4 PU decreased to 89 % in run five. However, dipping the used sample into a 0.1 M NaBH 4 solution restored the original efficiency of 98 %. This, however, was only a temporary remedy, since a low efficiency of 60 % was measured in run 10. PDA was suggested by the authors to act as a redox mediator to prevent the hydrolysis/oxidation of immobilized borohydride.This formula (5) should be moved up and placed before the paragraph starting with "Edouard et al…"The Zuo group used PDA particles (avg. diameter 240 nm) to induce the reduction of MB and rhodamine B (RhB) with NaBH 4 . [50] Quinone moieties of PDA were assumed to channel electrons from NaBH 4 to the dyes. Indeed, PDA oxidized with NaIO 4 exhibited increased degradatio...

show abstract

Surface modification of TiO2 with polydopamine and its effect on photocatalytic degradation mechanism

Cited by 83 publications

References 25 publications

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

Facile Synthesis of CuO Nanosheets and Efficient Degradation of Rhodamine B in a Copper Oxide/Ascorbic Acid/Hydrogen Peroxide System: Kinetics, Fate of Ascorbic Acid, and Mechanism

Polydopamine – its Prolific Use as Catalyst and Support Material

Contact Info

Product

Resources

About