Preparation of Ruthenium Incorporated Heterogeneous Catalysts Using Hydroxyapatite as Catalytic Supports for Aerobic Oxidation of Alcohols

Kim, Sohee; Jung, Jong-Hwa; Kim, Dong‐Hee; Woo, Dong Kyun; Park, Joon B.; Choi, Myong Yong; Kwon, Ki‐Young

doi:10.5012/bkcs.2013.34.1.221

Cited by 5 publications

(1 citation statement)

References 23 publications

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“…수산화인회석의 화학적 특징 중의 하나는 다양한 전 이 금속들과 수산화인회석의 칼슘 이온의 양이온 교환 반응을 통하여 수산화인회석 표면에서 다양한 전이금속을 도입할 수 있는 것이다. 이 러한 이온 교환 반응 특징 때문에 수산화인회석은 흡착제, 이종상촉매 의 기질, 조직공학 및 선크림 물질의 성분으로 사용될 수 있다 [13][14][15].…”

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Ultraviolet Blocking Material Based on Silver-doped Hydroxyapatite

Pyo¹,

Kim²,

Kwon³

2016

Applied Chemistry for Engineering

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Hydroxyapatite (HAP) was prepared by a hydrothermal synthesis method and also silver was introduced on the surface of HAP through an ion exchange reaction. The crystal phase and morphology of HAP were then evaluated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). In addition, the absorption property of HAP was characterized by diffuse reflectance UV-Vis spectroscopy. The presence of silver nanoparticles on the surface of HAP was also verified by XRD and TEM analysis. Particularly, the silver doped HAP showed an enhanced absorption property in UV-Vis region compared to that of the pristine HAP. 일반적으로 널리 사용되는 선크림은 280~400 nm의 파장 범위와 관련된 손상을 막아준다. ZnO와 TiO2의 나노 입자는 UV 스펙트럼의 넓은 흡수 범위 때문에 상업적으로 선크림의 무기물의 성분으로 널리 사용되어왔다 [6,7]. 이러한 금속산화물들의 한 가지 단점으로는 자외 선과 가시광선의 복사선에서 광촉매 활성을 보이기 때문에 광독성을 일으킨다 [8]. ZnO와 TiO2은 사람의 피부에 물리적으로 손상시킬 수 † Corresponding

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Ultraviolet Blocking Material Based on Silver-doped Hydroxyapatite

Pyo¹,

Kim²,

Kwon³

2016

Applied Chemistry for Engineering

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Ruthenium‐Incorporated Hydroxyapatites for the Oxidation of Alcohols and Amines Using Molecular Oxygen as an Oxidant

Kim

Jung

et al. 2014

Bulletin Korean Chem Soc

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A Silver‐doped Hydroxyapatite for an Active Sunscreen Material

Pyo

Kim

Park

et al. 2016

Bulletin Korean Chem Soc

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Among the wide spectrum of natural sunlight, exposure to ultraviolet (UV) light is harmful to the skin and causes various dermatologic diseases including skin cancer. 1,2 UV can be generally divided into three parts depending on wavelengths: UVA (315~400 nm), UVB (280~315 nm), and UVC (100~280 nm). It is well known that UVC barely reaches on the earth surface due to strong absorption in the ozone layer, however UVA and UVB radiation on the skin induces reactive oxygen species that result in the destruction of proteins, lipids, and nucleic acids through photooxidation reactions. [3][4][5] Sunscreens are widely utilized for prevention of damage related to UVA and UVB. The nanoparticles of zinc oxide and titanium dioxide are commonly used as inorganic components for commercial sunscreen materials due to the wide range absorbance of UV-spectrum. 6,7 One disadvantage of these materials is phototoxicity originated from their photocatalytic reactivity under the radiation of UV and visible lights. 8 Both compounds can generate reactive oxygen species associated with free radicals, which can potentially damage the human skin. 9 Hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ) 4 , HAP) is considered as a main inorganic material of human bone and teeth. 10 Because of its biocompatibility, HAPs are applied to artificial hard tissue engineering such as bond and dental implants. 11,12 In addition, the cation exchange reaction of the calcium ion in HAP with various transition metals enables incorporation of other metals on the surface of HAP. Because of the ion exchange ability, HAPs have been applied as sorption materials, heterogeneous catalysts, hard tissue engineering materials, and sun blocking materials. [13][14][15] The Amin group recently reported that HAP-ascorbic acid nanocomposite is utilized for the non-toxic constituent of sunscreen. 16 And zinc, manganese, and iron oxide-doped HAPs exhibit excellent UVblocking properties. 17,18 Herein, we report the preparation of silver-doped HAP (AgHAP) and its blocking capability of UV and visible radiation. We found that silver nanoparticles are incorporated on the surface of HAP and AgHAP exhibits an absorption spectra which covers full UV region as well as visible region. Therefore, we expect that AgHAP can be applied for the ingredient of sunscreen with less phototaxicity.HAP was synthesized by a hydrothermal method under a basic aqueous condition in which Na 2 HPO 4 and Ca(NO 3 ) 2 Á 4H 2 O were used as phosphate and calcium precursors, respectively. The details of preparation procedures was previously reported. 19 Silver-incorporated HAP was synthesized by a cation exchange reaction in aqueous solution. HAP (0.5 g) was added to the 50 mL of silver nitrate solution (0.01 M) with 1 min of sonication, followed by 20 min of rocking. The precipitates were collected by centrifugation, and washed three times using distilled water. Finally, AgHAP was obtained by drying under vacuum at ambient temperature for overnight, followed by annealing at 100 C for 3 h.The XRD patterns of HAP and Ag...

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Preparation of Ruthenium Incorporated Heterogeneous Catalysts Using Hydroxyapatite as Catalytic Supports for Aerobic Oxidation of Alcohols

Cited by 5 publications

References 23 publications

Ultraviolet Blocking Material Based on Silver-doped Hydroxyapatite

Ultraviolet Blocking Material Based on Silver-doped Hydroxyapatite

Ruthenium‐Incorporated Hydroxyapatites for the Oxidation of Alcohols and Amines Using Molecular Oxygen as an Oxidant

A Silver‐doped Hydroxyapatite for an Active Sunscreen Material

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