Metal recovery based magnetite near-infrared photocatalyst with broadband spectrum utilization property

Environmental implications and applications of engineered nanoscale magnetite and its hybrid nanocomposites: A review of recent literature

“…In another study, mixed-ferrites produced from electroplating wastewater for metal recovery is used as the magnetic agents. With the addition of lanthanides and F − ions, a novel magnetite near infrared photocatalyst of Er 3+ /Tm 3+ /Yb 3+ -(CaF2/ZnFe2O4/ZnO) (ETY-FCZ) is further synthesized, which results in higher removal rates of methyl orange and salicylic acid compared to those of Ca-Zn magnetite precursor [23]. Hybrid Fe3O4-graphite composites [24] and hollow Fe3O4-Fe NPs with graphene sheets [25] have been prepared by in-situ chemical precipitation as high-performance electromagnetic wave absorbing materials.…”

Enhanced core–shell CeO2:Er,Yb@W18O49 heterojunction H2 generation by multiband emissions of Er ions

“…Much effort has been undertaken toward combining plasmonic W 18 O 49 with UC materials to improve the photocatalysis efficiency under NIR irradiation by reabsorbing the visible UC emissions, including blue, green, and red emissions. Meanwhile, these visible emissions overlap with the weak absorption position of plasmonic W 18 O 49 [16,21,22]. The realization of enhanced NIR emissions in the octahedral CeO 2 :Er,Yb nanoparticles which match the more intense LSPR absorption in the NIR region can drive the LSPR effect more efficiently.…”

“…These converted UV, visible, and/or NIR emissions can be reabsorbed by W 18 O 49 which has a broad and intense LSPR absorption, and further used for photocatalysis. Appropriately combining UC materials with plasmonic semiconductors as the new photocatalyst can exploit the lower frequency incident NIR photons (occupying about 44% of solar irradiation) with high effectivity, which provides a novel way to solve the problem of limited photocatalytic solar-fuel conversion efficiency [21][22][23][24][25]. LSPR-induced photocatalysts, based on the sensitization of UC materials to plasmon nanomaterials, can maintain the high reactivity of photoelectrons and holes [26].…”

UCNPs@Zn0.5Cd0.5S Core-Shell and Yolk-Shell Nanostructures: Selective Synthesis, Characterization, and Near-Infrared-Mediated Photocatalytic Reduction of Cr(VI)

“…However, lanthanide ions doped upconversion nanoparticles (UCNPs), which can convert infrared energy to UV-Vis energy and excite semiconductors to broaden the scope of the spectral response and raise the utilization ratio of solar energy. Up to date, much effort has been devoted to fabricate NIR-light-mediated UCNP-based nanocomposites to fully utilize solar energy [20][21][22][23][24][25][26], including UCNPs@CuS [27][28][29][30], UCNPs@ZnO [31][32][33], UCNPs@TiO 2 [34][35][36][37], UCNPs@Bi 2 WO 6 [38,39], and UCNPs@Bi 2 MoO 6 [40][41][42]. As for the UCNP/semiconductor composites, the fluorescence energy can be passed from UCNPs (donors) to semiconductors (acceptors) to broaden the scope of the spectral response of the semiconductor effectively.…”