Highly Efficient, Low-Cost, and Magnetically Recoverable FePt–Ag Nanocatalysts: Towards Green Reduction of Organic Dyes

Abstract

Nowadays, synthetic organic dyes and pigments discharged from numerous industries are causing unprecedentedly severe water environmental pollution, and conventional water treatment processes are hindered due to the corresponding sophisticated aromatic structures, hydrophilic nature, and high stability against light, temperature, etc. Herein, we report an efficient fabrication strategy to develop a new type of highly efficient, low-cost, and magnetically recoverable nanocatalyst, i.e., FePt–Ag nanocomposites, for the reduction of methyl orange (MO) and rhodamine B (RhB), by a facile seed deposition process. X-ray diffraction results elaborate that the as-synthesized FePt–Ag nanocomposites are pure disordered face-centered cubic phase. Transmission electron microscopy studies demonstrate that the amount of Ag seeds deposited onto the surfaces of FePt nanocrystals increases when increasing the additive amount of silver colloids. The linear correlation of the MO and RhB concentration versus reaction time catalyzed by FePt–Ag nanocatalysts is in line with pseudo-first-order kinetics. The reduction rate constants of MO and RhB increase with the increase of the amount of Ag seeds. FePt–Ag nanocomposites show good separation ability and reusability, and could be repeatedly applied for nearly complete reduction of MO and RhB for at least six successive cycles. Such cost-effective and recyclable nanocatalysts provide a new material family for use in environmental protection applications.

A Novel Au@Cu2O-Ag Ternary Nanocomposite with Highly Efficient Catalytic Performance: Towards Rapid Reduction of Methyl Orange Under Dark Condition

“…Recently, Au, Ag, Pt, and other noble metal nanocatalysts are recognized as promising catalysts for the removal of azo dyes by the virtue of high efficiency [18][19][20]. Among these noble metal nanomaterials, Au nanocrystals have been proven to be the optimal catalysts due to the excellent chemical and physical stability, tunable optical properties, high catalytic performances, and the surface plasmon resonance (SPR) properties [21][22][23][24].…”

Enhanced Catalytic Reduction of 4-Nitrophenol Driven by Fe3O4-Au Magnetic Nanocomposite Interface Engineering: From Facile Preparation to Recyclable Application

“…Several excellent reviews discussed that the stability of Au NPs could be significantly improved through solid supporting materials , such as carbon, silica, magnetic materials, and so on [ 29 , 30 , 31 ]. Among the various above-mentioned supports, iron oxides have received much more attention because they can be readily separated with a magnet and thereby possess the advantage of being magnetically recoverable and recyclable [ 32 , 33 , 34 , 35 , 36 ].…”

Recent advances in thermally activated delayed fluorescence for white OLEDs applications

“…In the design of device structure, exciton distribution should be precisely regulated, and the appropriate energy-level matching between each layer [169][170][171] and optical coupling technology [172][173][174] could help to increase the efficiency of devices. Many previous reports have claimed with suffering severe efficiency roll-off, which may be related to charge bal- ance, interlayer barriers, and slower RISC rate of TADF materials [175][176][177][178][179][180][181][182]. To loosen this bottleneck, the most important thing is to suppress the concentration quenching effect caused by triplet excitons.…”