Synthesis and Characterization of Yellow Pigments of Bi_1.7RE_0.3W_0.7Mo_0.3O₆ (RE = Y, Yb, Gd, Lu) with High NIR Reflectance

Abstract

Brilliant yellow-orange pigments based on the formula Bi1.7RE0.3W0.7Mo0.3O6 (RE = Y, Yb, Gd, Lu) are developed by the traditional solid-state reaction method. Relevant techniques are used for characterization of the crystal structure, morphology feature, reflectance property, and color performance of the prepared pigment. The doping of RE/Mo in Bi2WO6 results in the colors of pigments varying from faint yellow to brilliant yellow-orange. Compared with Bi2WO6 pigment, the typical pigment of Bi1.7Lu0.3W0.7Mo0.3O6 greatly improves the yellow hue component (b*) value to be 72.03. Moreover, the NIR reflectances of all of the samples are higher than 95% , and their NIR solar reflectances are above 94%. The typical pigment of Bi1.7Lu0.3W0.7Mo0.3O6 coated on galvanized sheet exhibits excellent coloring performance with a high NIR solar reflectance (83.32%). The acid/alkali resistance studies reveal that the pigments are chemically stable under the atrocious weather conditions. Thus, the superior performances of synthesized pigments have exhibited potential for energy savings.

Improvement of near-infrared (NIR) reflectivity and black color tone by doping Zn2+ into the Ca2Mn0.85Ti0.15O4 structure

“…Many studies have been reported on several colored pigments that can reect NIR light. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] The NIR-reectance properties of variously colored pigments (e.g. white, yellow, and blue) are generally better than those of black pigments, because these pigments tend to reect not only visible but also NIR light.…”

Facet, Junction and Electric Field Engineering of Bismuth‐Based Materials for Photocatalysis

“…Hence, the separation and transfer of photoinduced charges are highly facilitated, consequently giving rise to the improved photocatalytic activities. [115] Another typical bismuth-based p-n junction is BiOX/g-C 3 N 4 heterojunction. [116117] Many pentavalent bismuthates exhibit excellent visible-light driven photocatalytic performances.…”

“…[159] This prominent enhancement of photocatalytic performance and efficient separation of photoinduced electron-hole pairs are attributed to the construction of a Z-scheme structure and reliable interfacial interaction of BiVO 4 /g-C 3 N 4 . A series of techniques, [115] nÀBi 12 O 17 Cl 2 / pÀBiOI photocatalytic oxidation of 2,4-DCP, RhB, phenol, BPA, and tetracycline hydrochloride [119] nÀSr 2 TiO 4 / pÀBi 5 O 7 I photocatalytic oxidation of MO [120] pÀBiOI/ nÀBiPO 4 photocatalytic oxidation of MO and phenol [121] pÀBiOBr/ nÀLa 2 Ti 2 O 7 photocatalytic oxidation of RhB and phenol [122] pÀBiOI/ nÀBi 2 O 2 CO 3 photocatalytic oxidation of RhB [123] pÀBiOI/ nÀgÀC 3 N 4 photocatalytic oxidation of BPA [124] nÀBiPO 4 / pÀBiOBr Photocatalytic activity for formaldehyde Oxidation; photocatalytic oxidation of RhB [125126] pÀBiOCl/ nÀBiVO 4 photocatalytic oxidation of RhB [127] pÀBiOI/ nÀBiOIO 3 photocatalytic oxidation of MB [30] pÀCuBi 2 O 4 / nÀBiWO 6 photocatalytic oxidation of MB and photocatalytic reduction of Cr 2 O 7 2À [128] pÀBiOCl/ nÀBiVO 4 photocatalytic oxidation of MO [129] pÀBi 2 O 3 / nÀBi 2 WO 6-x F 2x photocatalytic oxidation of RhB [130] pÀBiOCl/ nÀBi 2 O 2 CO 3 photocatalytic oxidation of RhB [131] pÀBi 2 O 3 / nÀBi 2 WO 6 photocatalytic oxidation of RhB and phenol [114] pÀBiOI/ nÀMnNb 2 O 6 degradation of antibiotics (TC, oxytetracycline, ciprofloxacin and doxycycline) [132] pÀBiOBr/ nÀCeO 2 photocatalytic oxidation of RhB, MB and phenol [133] pÀBiOBr/ nÀBi(C 2 O 4 ) OH photocatalytic oxidation of RhB [134] pÀBi 2 O 3 / nÀBi 2 MoO 6 photocatalytic oxidation of RhB and 2,4-DNP [135] pÀBiOBr/ nÀZnO photocatalytic oxidation of phenol [136] pÀBiOBr/ nÀBiOIO 3 photocatalytic oxidation of RhB, MB, MO and crystal violet [137] pÀBiOBr/ nÀTiO 2 photocatalytic oxidation of RhB and photocatalytic H 2 generation [138] pÀBiOI/ nÀBrÀBi 2 O 2 CO 3 photocatalytic oxidation of MO [139] pÀBiOI/ nÀBi 2 Sn 2 O 7 photocatalytic oxidation of RhB [140] pÀBiOI/ nÀSnS 2 photocatalytic oxidation of RhB [141] nÀFe 2 O 3 / pÀBiOI photocatalytic oxidation of RhB…”

Thermal Insulation Performance of Novel Coated Fabrics Based on Fe-Doped BaSnO3 Near-Infrared Reflectance Pigments

“…To the best of our knowledge, heat build-up in the environment is mainly due to radiation of sunlight in the near-infrared band (750–2500 nm), especially in extremely hot weather . The use of high near-infrared reflective materials helps in maintaining the material surface at a lower temperature, minimizing the human bodyʼs absorption of solar thermal energy, and improving the thermal comfort of urban living . Recently, plenty of inorganic pigments, such as Mo-doped Bi 2 WO 6 , Tb-doped A 2 CeO 4 (A = Sr and Ba), Cr-doped BaTiO 3 , and BiVO 4 –ZnO, have been reported as near-infrared reflective pigments. − However, most near-infrared reflective pigments are used as cold coatings in the construction industry but rarely on fabric surfaces .…”