Recyclable Magnetic Cu/CuFe2O4 Nanocomposites for the Rapid Degradation of 4-NP

Abstract

Magnetic Cu/CuFe2O4 nanocomposites were prepared by the one-pot thermal decomposition of acetylacetone compounds. Adjusting the molar ratios of Fe to Cu was used to control the content of Cu in the synthetic process. XRD, TEM, XPS and UV-Vis were employed to reveal detailed structural and catalytic activities of Cu/CuFe2O4 nanocomposites. Magnetic measurements demonstrated that Cu/CuFe2O4 nanocomposites possessed a considerable magnetic saturation. Cu/CuFe2O4 nanocomposites showed superb efficiency in the degradation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). 4-NP could be reduced by Cu/CuFe2O4 nanocomposites within 40 s in the attendance of NaBH4. Cu nanocrystals played an indispensable rose in the enhancement of catalytic performance. The synergistic effect of Cu and CuFe2O4 nanocrystals achieved the high-efficiency catalytic reduction for 4-NP. After six recycling experiments, the efficiency of Cu/CuFe2O4 nanocomposites was almost stable. Our work advances a straightforward strategy to synthesize efficient and recoverable Cu/CuFe2O4 nanocomposites, which has promising utilizations in the purifying of nitrophenolic contamination.

Band gap and oxygen vacancy engineering of honeycomb‐like CuFe2O4 spinels toward enhanced high infrared emissivity

“…Remarkably, the proportion of OVs in the CNFO‐ X powders increases and then decreases as the Ni doping amount increases from 0% to 20% and reaches a maximum (∼42.7%) at the case of 15% Ni content. The Cu 2p emission spectra of the prepared CNFO‐ X specimen (Figure 3C) can be deconvoluted into two shoulders of ∼933.46 and ∼934.7 eV, which are attributed to Cu(I) and Cu(II), respectively 31 . Similarly, the peaks located at ∼710.6 (i.e., Fe(II)) and ∼712.6 eV (i.e., Fe(III)) in Fe 2p as well as the peaks at ∼854.9 and ∼856.0 eV in Ni 2p can be specifically classified (Figure 3D,E).…”

“…The Cu 2p emission spectra of the prepared CNFO-X specimen (Figure 3C) can be deconvoluted into two shoulders of ∼933.46 and ∼934.7 eV, which are attributed to Cu(I) and Cu(II), respectively. 31 Similarly, the peaks located at ∼710.6 (i.e., Fe(II)) and ∼712.6 eV (i.e., Fe(III)) in Fe 2p as well as the peaks at ∼854.9 and ∼856.0 eV in Ni 2p can be specifically classified (Figure 3D,E). 31,32 Intriguingly, the proportion of low-valent metal ions, including Cu(I), Fe(II), and Ni(II), corresponding to all metal elements in the products gradually decreases as the Ni doping percentage in the system increases from 0% to 15%.…”

A novel Au/electroactive poly(amic acid) composite as an effective catalyst for p-nitrophenol reduction

“…Fig. 5(b) displays the typical UV-spectra at 300 nm, 45 which show the formation of PAP from the reduction of the p -nitrophenolate ion. 46 After the Au/EPAA composite was added, the solution changed from dark yellow to colorless, and the reduction reaction was completed within 270 s without ultrasound or stirring.…”

Magnetic recoverable Cu/CuFe2O4 nanocomposite as an efficient catalyst for 4-nitrophenol reduction and methylene blue degradation

“…Ngoài ra, những phản ứng này có sử dụng các tác chất độc hại, có thể gây ung thư và đột biến 15 . Những kết quả nghiên cứu gần đây nhất cho thấy, phản ứng khử 4-NP trong dung dịch nước khi sử dụng lượng dư natri borohydride (NaBH 4 ) và các chất xúc tác ferrite được xem là tối ưu do phản ứng đơn giản cùng hiệu quả khử 4-NP cao [16][17][18][19] . Riêng đối với MB, đã có rất nhiều phương pháp được đề nghị để xử lý loại phẩm nhuộm hữu cơ này trong nước thải [20][21][22][23][24] .…”