Preparation and photocatalytic activity of Mo-modified Ti-doped HAp

Jiraborvornpongsa, Noppasint; Isobe, Toshihiro; Matsushita, Sachiko; Oshikiri, Mitsutake; Wakamura, Masato; Fujii, Kotaro; Yashima, Masatomo; Nakajima, Akira

doi:10.1016/j.apcatb.2018.10.056

Cited by 14 publications

(5 citation statements)

References 49 publications

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“…Furthermore, the introduction of HAp had a negligible influence on the pattern of Ti-BS. The peaks of Ti-BS/HAp became weakened, while there were two added peaks at 20.79° and 28.22°, indicating the existence of hydroxyapatite crystals in Ti-BS/HAp . Meanwhile, the FTIR spectrum showed two characteristic bands at 550–560 and 1000–1100 cm –1 , suggesting the occurrence of PO 4 3– (Figure b) .…”

Section: Results and Discussionmentioning

confidence: 96%

“…The peaks of Ti-BS/ HAp became weakened, while there were two added peaks at 20.79°and 28.22°, indicating the existence of hydroxyapatite crystals in Ti-BS/HAp. 23 Meanwhile, the FTIR spectrum showed two characteristic bands at 550−560 and 1000−1100 cm −1 , suggesting the occurrence of PO 4 3− (Figure 2b). 24 As shown in Figure 2c, the zeta potentials of Ti-BS and Ti-BS/HAp were −7.01 and −1.93 mV, respectively.…”

Section: Resultsmentioning

confidence: 98%

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Photoelectric-Responsive Extracellular Matrix for Bone Engineering

Fu¹,

Liu²,

Cui

et al. 2019

ACS Nano

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Using noninvasive stimulation of cells to control cell fate and improve bone regeneration by optical stimulation can achieve the aim of precisely orchestrating biological activities. In this study, we create a fast and repeatable photoelectric-responsive microenvironment around an implant using a bismuth sulfide/hydroxyapatite (BS/HAp) film. The unexpected increase of photocurrent on the BS/HAp film under near-infrared (NIR) light is mainly due to the depletion of holes through PO 4 3− from HAp and interfacial charge transfer by HAp compared with BS. The electrons activate the Na + channel of mesenchymal stem cells (MSCs) and change the cell adhesion in the intermediate environment. The behavior of MSCs is tuned by changing the photoelectronic microenvironment. RNA sequencing reveals that when photoelectrons transfer to the cell membrane, sodium ions flux and the membrane potential depolarizes to change the cell shape. Meanwhile, calcium ions fluxed and FDE1 was upregulated. Furthermore, the TCF/LEF in the cell nucleus began transcription to regulate the downstream genes involved in osteogenic differentiation, which is performed through the Wnt/Ca 2+ signaling pathway. This research has created a biological therapeutic strategy, which can achieve in vitro remotely, precisely, and noninvasively controlling cell differentiation behaviors by tuning the in vivo photoelectric microenvironment using NIR light.

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Section: Results and Discussionmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 98%

Photoelectric-Responsive Extracellular Matrix for Bone Engineering

Fu¹,

Liu²,

Cui

et al. 2019

ACS Nano

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“…First, it is well-known that HAP has an excellent ion exchange ability for both cations and anions. , Different ions incorporated into HAP impart some special functions. For example, Co-/Ni-containing HAP shows a high catalytic activity, , while Ti substitution makes HAP into a semiconductor. , In this work, we investigate the incorporation of lanthanide ions (Eu 3+ and Tb 3+ ions) into HAPNWs, making the CF paper photoluminescent. The preparation procedures are illustrated in Figure a.…”

Section: Resultsmentioning

confidence: 99%

“…For example, Co-/Ni-containing HAP shows a high catalytic activity, 32,33 while Ti substitution makes HAP into a semiconductor. 56,57 In this work, we investigate the incorporation of lanthanide ions (Eu 3+ and Tb 3+ ions) into HAPNWs, making the CF paper photoluminescent. The preparation procedures are illustrated in Figure 3a.…”

Section: Resultsmentioning

confidence: 99%

Customized Cellulose Fiber Paper Enabled by an In Situ Growth of Ultralong Hydroxyapatite Nanowires

et al. 2021

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Cellulose fiber (CF) paper is a low-cost, sustainable, and flexible substrate, which has gained increasing interest recently. Before practical usage, the functionalization of the pristine CF paper is indispensable to meet requirements of specific applications. Different from conventional surface modification or physical mixing methods, we report in situ growth of ultralong hydroxyapatite nanowires (HAPNWs) with lengths larger than 10 μm on the CF paper. HAPNWs are radially aligned on the surface of CFs, creating a micro/nanoscale hierarchical structure. By means of the excellent ion exchange ability of HAP and the hierarchical structure, the functions of the CF paper can be easily customized. As a proof-of-concept, we demonstrate two kinds of functional CF paper: (1) the photoluminescent CF paper by doping Eu3+ and Tb3+ ions into the crystal lattice of HAPNWs and (2) the superhydrophobic CF paper by coating poly(dimethylsiloxane) on the HAPNW hierarchical structure, which can be applied for self-cleaning and oil/water separation. It is expected that an in situ growth of ultralong HAPNWs will provide an instructive guideline for designing a CF paper with specific functions.

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“…In contrast, HAp-T1 shows an intense signal even at 300 °C. Besides, there are no signals attributed by trapped electrons (g = 1.988) and crystalline defects (g = 1.999) from Ti-HAp [43] as well as by oxygen radical in TiO 2 (g=2.003) [44]. Moreover, the typical signal caused by anatase Ti 3+ defects (g = 1.992) [45] does not appear in our synthesized HAp/TiO 2 composites and the synthesized TiO 2 particles without HAp (figure 8(c)).…”

Section: Esr Analysismentioning

confidence: 97%

HAp/TiO₂ heterojunction catalyst towards low-temperature thermal oxidation of VOC

Kato¹,

Kobayashi²,

Xin³

et al. 2022

Mater. Res. Express

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Ceramic catalyst without precious metals and rare-earth elements is a promising technology for removing volatile organic compounds (VOC) produced in the manufacturing process to feasibly solve worldwide health and environmental problems. We first investigate the influence of hydroxyapatite (HAp)/TiO2 heterojunction formation on the temperature dependence of VOC catalytic performance. The comprehensive evaluation by XRD, FT-IR, UV-vis, and in-situ ESR clarifies that the anisotropic crystal distortion along the c-axis of HAp lattice is caused by hydrolysis and hetero-condensation TiO2 precursor accompanying with the defective structure in HAp. The structural modified HAp (m-HAp) provides the notable alteration of optical bandgap with the visible-light coloration and the preferential generation of oxygen radical. Furthermore, we propose a new model that the m-HAp/TiO2 heterojunction should be a possible main factor affecting the more than twice higher catalytic performance in thermal oxidation of ethyl acetate at a lower temperature, as typically shown in HAp-T1.

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Preparation and photocatalytic activity of Mo-modified Ti-doped HAp

Cited by 14 publications

References 49 publications

Photoelectric-Responsive Extracellular Matrix for Bone Engineering

Photoelectric-Responsive Extracellular Matrix for Bone Engineering

Customized Cellulose Fiber Paper Enabled by an In Situ Growth of Ultralong Hydroxyapatite Nanowires

HAp/TiO₂ heterojunction catalyst towards low-temperature thermal oxidation of VOC

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Preparation and photocatalytic activity of Mo-modified Ti-doped HAp

Cited by 14 publications

References 49 publications

Photoelectric-Responsive Extracellular Matrix for Bone Engineering

Photoelectric-Responsive Extracellular Matrix for Bone Engineering

Customized Cellulose Fiber Paper Enabled by an In Situ Growth of Ultralong Hydroxyapatite Nanowires

HAp/TiO2 heterojunction catalyst towards low-temperature thermal oxidation of VOC

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Product

Resources

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HAp/TiO₂ heterojunction catalyst towards low-temperature thermal oxidation of VOC