Palliyaguru Lalinda, Kulathunga M Ushan S, Kumarasinghe K G Upul R, Jayaweera Champa D, Jayaweera Pradeep M
Department of Chemistry, University of Sri Jayewardenepura, Nugegoda, Sri Lanka (L.P., M.U.S.K., K.G.U.R.K., C.D.J., P.M.J.).
J Cosmet Sci. 2019 May/Jun;70(3):149-159.
Ilmenite mineral sand was used to synthesize titanium bismonohydrogen orthophosphate monohydrate, Ti(HPO)·HO, and titanium phosphate, TiPO, two white pigments suitable in cosmetic applications. Ti(HPO)·HO was obtained after digesting ilmenite in 85% phosphoric acid at 150 °C for 5 hours. On standing, unreacted ilmenite and white Ti(HPO)·HO solid separated into two layers and Ti(HPO)·HO was calcined at 900 °C to obtain the crystalline TiPO. Chemical and morphological characteristics were investigated using X-ray diffraction, transmission electron microscopy, scanning electron microscopy coupled with energy dispersive X-ray analysis, Fourier-transform infrared, and X-ray photoelectron spectroscopic techniques. The water retention (WR) capacities were measured at a relative humidity of 57% and indicate that Ti(HPO)·HO and TiPO have increased WR ability when compared with the pigment grade (PG) TiO. The optical properties of Ti(HPO)·HO, TiPO, and PG-TiO were compared using Ultraviolet-visible diffuse reflectance spectroscopy. The relative photoactivity of Ti(HPO)·HO and TiPO was determined using a chemical method based on the photobleaching behavior of a stable radical, 1,1-diphenyl 2-picrylhydrazyl. The photoactivities of Ti(HPO)·HO and TiPO are lower than that of PG-TiO.
钛铁矿砂被用于合成一水合磷酸氢铋钛（Ti(HPO₄)₂·H₂O）和磷酸钛（TiPO₄），这两种白色颜料适用于化妆品应用。在150℃下将钛铁矿在85%的磷酸中消化5小时后得到Ti(HPO₄)₂·H₂O。静置后，未反应的钛铁矿和白色的Ti(HPO₄)₂·H₂O固体分层，然后将Ti(HPO₄)₂·H₂O在900℃下煅烧以获得结晶的TiPO₄。使用X射线衍射、透射电子显微镜、扫描电子显微镜结合能量色散X射线分析、傅里叶变换红外光谱和X射线光电子能谱技术研究了其化学和形态特征。在相对湿度为57%的条件下测量了保水（WR）能力，结果表明与颜料级（PG）TiO₂相比，Ti(HPO₄)₂·H₂O和TiPO₄具有增强的保水能力。使用紫外可见漫反射光谱比较了Ti(HPO₄)₂·H₂O、TiPO₄和PG-TiO₂的光学性质。基于稳定自由基1,1-二苯基-2-苦基肼的光漂白行为，采用化学方法测定了Ti(HPO₄)₂·H₂O和TiPO₄的相对光活性。Ti(HPO₄)₂·H₂O和TiPO₄的光活性低于PG-TiO₂。
