Chromium (VI) removal using microbial cellulose/ nano-Fe3O4 @polypyrrole: Isotherm, kinetic and thermodynamic studies

Efficient Photodegradation of Eriochrome Black-T by a Trimetallic Magnetic Self-Synthesized Nanophotocatalyst Based on Zn/Au/Fe-Embedded Poly(vinyl alcohol)

“…As can be seen in Figure b­(i), the main and well-defined diffraction peaks of Fe 3 O 4 emerged at 2θ = 30.09, 35.62, 42.98, 54.79, 57.49, and 62.38° based on JCPDS No. 00-003-0863 . The PVA structure with several OH groups along the main chain provides inter- and intramolecular hydrogen bonding.…”

“…These peaks confirmed the presence of CTAB as the stabilizing agent of the noble Au NPs. 51 The XRD patterns of the prepared Fe 3 O 4 @PVA, ZnO NRs, Fe 3 O 4 @PVA-Au, and the Fe 3 O 4 @PVA−Au/ZnO magnetic photocatalytic system were analyzed for crystalline phase and 52 The PVA structure with several OH groups along the main chain provides inter-and intramolecular hydrogen bonding. The featured peaks at 2θ = 18 and 40.7°are assigned to the semicrystalline structure of pure PVA and amorphous phases in the PVA structure, respectively.…”

Magnetic Core@Shell Fe3O4@Polypyrrole@Sodium Dodecyl Sulfate Composite for Enhanced Selective Removal of Dyestuffs and Heavy Metal Ions from Complex Wastewater

“…The adsorption method has become one of the most effective means for the treatment of sewage because of its simple operation, high removal efficiency, no secondary pollution, and low cost. , The adsorption method based on magnetic separation technology has attracted extensive attention in water treatment applications. − Fe 3 O 4 microspheres have a large specific surface area, high surface activity, and most importantly, high magnetism, so they can play an important role in water treatment as an adsorbent. In addition, of particular attention is that the magnetism stemming from Fe 3 O 4 microspheres can ensure the rapid separation of the adsorbent from the solution. − However, the lack of specific interactions between Fe 3 O 4 microspheres and the adsorbates often leads to inferior adsorption performances. , Therefore, the combination of Fe 3 O 4 microspheres and conducting polymers − having abundant functional groups is considered to overcome this shortcoming. Polypyrrole (PPy) has many advantages due to its good electrical conductivity, redox properties, environmental stability, and low price, and, notably, the presence of positively charged nitrogen atoms that can adsorb dyestuffs and reduce heavy metal ions. − For instance, Liu et al fabricated a Fe 3 O 4 @PPy composite and tested trace vitamin D 3 in aquatic products by extraction-high performance liquid chromatography and achieved remarkable results.…”

“…Adsorption Experiment. First, 100 mg L −1 solutions of MB, MG, RhB, CR, and AR1 were separately prepared and then diluted into different concentrations (10,20,30,40 copy, and the effects of concentration, temperature, and types of adsorbents on adsorption performances were explored. The adsorption capacity Q (mg g −1 ) and the removal efficiency q (%)…”

3D Fe3O4-decorated Nitrogen-doped Graphene Aerogel as a Highly Durable Electrocatalyst for Oxygen Reduction Reactions

“…Fe is one of the earth-abundant transition metals. Fe3O4, an oxide of Fe, is characterized by good electrical conductivity (>100 S cm -1 ), high specific surface area, and chemical stability in an alkaline medium [11][12][13]. Nanostructured Fe3O4 species are considered one of the most promising catalysts for ORR as they exhibit outstanding electrolytic activity [14,15].…”