Magnetically Separable Nanospherical g-C₃N₄@Fe₃O₄ as a Recyclable Material for Chromium Adsorption and Visible-Light-Driven Catalytic Reduction of Aromatic Nitro Compounds

Abstract

Graphite-like graphitic carbon nitride (g-C 3 N 4 ) has gained considerable interest in the past few years. However, merely a few studies have been undertaken regarding the application of g-C 3 N 4 for metal adsorption and visible-lightdriven reduction of aromatic nitro compounds. Here, we describe a versatile method for the preparation of g-C 3 N 4 nanocomposite decorated with magnetite nanoparticles (g-C 3 N 4 @Fe 3 O 4 NPs) that subsequently showed their efficiency in sequestration of Cr(VI)/Cr(III) and NaBH 4 -mediated conversion of 2-nitroaniline (2-NA) and 4-nitroaniline (4-NA) under visible-light exposure. The as-synthesized g-C 3 N 4 @Fe 3 O 4 NPs adsorbent revealed excellent water dispersibility, superior magnetic property, and porous structure. Numerous surface hydroxyls (−OH) and amino groups (−N, −NH, −NH 2 ) enabled g-C 3 N 4 @Fe 3 O 4 NPs to rapidly isolate Cr(VI) from aqueous solution through applying an outer magnetic field. The adsorbed Cr(VI) on the g-C 3 N 4 @Fe 3 O 4 NPs surface offered a maximum equilibrium adsorption capacity of 555 mg g −1 , and their absorption behavior followed the Langmuir isotherm and pseudo-second-order kinetics model. The morphology, surface properties, crystalline structure, and chemical compositions of g-C 3 N 4 @Fe 3 O 4 NPs were thoroughly investigated. In real-world applications, g-C 3 N 4 @Fe 3 O 4 NPs was implemented for the determination of total chromium in industrial soil sludge samples. Additionally, NaBH 4 -induced reduction of 2-NA to 2-aminoaniline and 4-NA to 4-aminoaniline catalyzed by g-C 3 N 4 @ Fe 3 O 4 NPs (catalyst loading as low as 20 mg) was achieved within 8 min.

Superior Adsorption and Photocatalytic Degradation Capability of Mesoporous LaFeO3/g-C3N4 for Removal of Oxytetracycline

“…So the combination of adsorption with photocatalysis should fabricate a class of materials with higher efficiency. Many reports have been devoted to the development of the heterojunction photocatalysts based on g-C 3 N 4 with the synergetic effect of adsorption and photocatalytic degradation capability [44][45][46][47][48]. The construction of these heterojunction boosted the separation efficiency of photoinduced carriers under visible-light illumination and enhanced the adsorption capability.…”

Highly Efficient S‐g‐CN/Mo‐368 Catalyst for Synergistically NADH Regeneration Under Solar Light

“…After that, 2, 2′‐bipyridyl (2 equiv., 25.24 mg) was added to the resultant solution and stirred at room temperature. The resulting, yellow‐colored precipitation was produced by adding excess amounts of diethyl ether (19,33,34). The final product was filtered at room temperature and dried.…”

Magnetically recoverable catalysts for the preparation of pyridine derivatives: an overview

“…In 2019, Edrisi et al synthesized g-C 3 N 4 94 according to the reported method. 61 g-C 3 N 4 94 was functionalized with Fe 3 O 4 nanoparticles 62 to give Fe 3 O 4 @g-C 3 N 4 95. Finally, Fe 3 O 4 @g-C 3 N 4 –SO 3 H 96 was washed with methanol and ethyl acetate and afterward dried under vacuum at 60 °C ( Scheme 34 ).…”