Green iron nanoparticles supported on amino-functionalized silica for removal of the dye methyl orange

Combined Action of Adsorption and Catalytic Oxidation in Aluminum Dye Removal by Groundwater Treatment Waste

“…Iron compounds can be supported on other solid materials (Thomas et al, 2021;Garrido-Ramírez et al, 2010). Iron-containing catalysts loaded on activated carbon (Rubeena et al, 2018) or silica (Perrotti et al, 2019) enhanced the dye degradation.…”

“…Adsorption and catalysis using activated carbons and H 2 O 2 were combined for the decoloration of dye solutions (Santos et al, 2009). The impact of adsorption and catalytic activation on removing of Methyl Orange dye by iron oxyhydroxides supported on aminofunctionalized silica was determined (Perrotti et al, 2019).…”

Green Synthesis of Iron Oxides and Phosphates via Thermal Treatment of Iron Polyphenols Synthesized by a Camellia sinensis Extract

“…TPs are biorenewable, biodegradable, nontoxic, and water soluble at room temperature and can act as biotemplates for the formation of FeONPs, avoiding the thermodynamically favorable agglomeration . The interaction of iron ions with TPs makes it difficult to form repeating lattice structures required for crystallinity; thus usually amorphous materials are produced, as reported for green tea, black tea, white tea, Yerba Mate, and eucalyptus leaf extracts. − Moreover, the TP alcoholic functional groups form metal complexes through chelation that can help to stabilize the NPs . Finally, TPs also act as reducing agents, whose reduction potentials range between +0.3 and +0.8 V, while the redox potentials of Fe 3+ /Fe 2+ and Fe 2+ /Fe 0 are +0.77 and −0.44 V, respectively. , This indicates that Fe 3+ can be reduced to Fe 2+ by TP, but it is difficult to further reduce Fe 2+ to Fe 0 .…”

“…Nanoparticles derived from green tea were comprehensively characterized, and the Mössbauer data also revealed the formation of an iron­(II/III) polyphenol . FeONPs prepared with black tea and Yerba Mate have been investigated by Mössbauer spectroscopy and were assigned to akaganeite (β-FeOOH) or ferrihydrite (5Fe 2 O 3 ·9H 2 O), in addition to a smaller amount of Fe 2+ compounds formed from TP reduction . The green synthesis of FeONPs prepared with four plant species has shown that the reduction of iron salts is unlikely to generate vast quantities of stable nZVIs but rather favors the formation of FeONPs with different sizes, agglomeration tendencies, and shapes and with similar amorphous natures .…”

A hybrid design of Ag-decorated ZnO on layered nanomaterials (MgAC) with photocatalytic and antibacterial dual-functional abilities

“…[19][20][21][22][23] In such cases, MgAC with amine functional groups, which acted as interaction sites with other nanomaterials, signicantly increased loading efficiency, a homogeneous dispersion, and created many individual active sites, avoiding agglomeration, and ensuring long-term structural stability. 24,25 In this work, a simple two-step electrochemical method using MgAC as a great stabilizer and reductant is introduced for the rst time, facilitating the better uniform formation and long-term stability of Ag@ZnO nanoparticles (NPs) on the MgAC matrix without using any chemical additives. The inuence of the appearance of both Ag and MgAC on the photocatalytic performance toward methylene blue (MB) degradation and antibacterial activity via the strong interaction among ZnO and metallic Ag for both Salmonella (Sal) and Staphylococcus aureus (S. aureus) bacterial strains was investigated.…”