A hydroxyapatite–Fe₂O₃ based material of natural origin as an active sunscreen filter

Abstract

A hydroxyapatite–Fe2O3 based material of marine origin – fish bones treated in Fe(ii)-containing solution – shows potential as a sunscreen filter, absorbing in UVA/UVB intervals, with no free radical formation under irradiation.

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

“…Also, HA is added to some brands of toothpaste as a gentle polishing agent instead of calcium carbonate (Niwa et al 2001;Kim et al 2006). Non-biomedical applications of HA include its using as an environmentalfriendly filler for elastomers (Pietrasik et al 2008), a lowtemperature sorbent (Bailliez et al 2004;Corami et al 2008) and/or stabilizer (Wang et al 2014b) of poisonous chemical elements, a high-temperature sorbent for carbon dioxide (Landi et al 2014), both a catalyst Rodrigues et al 2014) and a carrier for other catalysts (Domínguez et al 2009;Sun et al 2009;Vukomanović et al 2012), a material for ultraviolet light protection (Holzmann et al 2009) and sunscreen filter (Piccirillo et al 2014), as well as a component of various sensors (Nagai et al 1988;Petrucelli et al 1996;Tagaya et al 2010;Khairnar et al 2011). Finally, highly flexible and nonflammable inorganic paper could be prepared from HA (Lu et al 2014a).…”

Increased UV absorption properties of natural hydroxyapatite‐based sunscreen through laser ablation modification in liquid

“…The FeHAp powder was prepared as previously reported; the protocol is briefly described again for clarity. The cod fish bones were placed into a solution containing FeCl 2 in excess (about five times the HAp content in the bones) at a basic pH; the solution was stirred at 75‐80°C for 5 hours.…”

“…The Rietveld data analysis was performed using the GSAS package and its graphical interface EXPGUI . The starting atomic parameters for HAp, FeHAp, and α‐Fe 2 O 3 were taken from the literature; the following parameters were refined: scale‐factors, 0‐point, 10 coefficients of the shifted Chebyshev function to fit the background, unit cell parameters and profile coefficients—two Lorentzian terms, L X and L Y , while the G W angle‐independent term was constrained to that obtained from the refinement of LaB 6 (standard NIST 660b)—peak correction for asymmetry and sample displacement effects.…”

“…In a previous work, a HAp‐based Fe‐containing sunscreen derived from cod fish bones was developed . The powders were made by treating the bones with a basic FeCl 2 solution and successively calcining them at 700°C; the composition of the material was HAp, a mixed phosphate of calcium and iron Ca 9 FeH(PO 4 ) 7 and α‐Fe 2 O 3 .…”

Facile synthesis of Fe3O4/SiO2/molecularly imprinted hydroxyapatite nanocomposite and its enhanced photocatalytic degradation of target contaminant

“…Magnetic separation provides a simple and effective method for removing and recycling magnetic particles from the treated water by external magnetic field. The accommodation of magnetic nanocrystallites into HAP matrix has been reported by several researchers and used as a high-performance heterogeneous catalyst [4][5][6]. The core-shell Fe 3 O 4 /HAP nanoparticles have been successfully prepared and used as photocatalysts for photocatalytic degradation of organics in our previous report [7,8].…”