New composites based on zeolites (H-Beta, H-ZSM-5) and nanosized titanium(iv) oxide (anatase and η-phase) doped by Ni, Ag, V with photocatalytic, adsorption and bactericidal properties

Abstract

The first prepared nanocomposites with zeolites H-Beta, H-ZSM-5 and anatase and η-phases, doped by V, Ni, Ag, are multifunctional materials for water purification from harmful pollutants and pathogenic bacteria.

Design of MFI Type Aluminum- and Titanium-Containing Zeolites

“…The objects of the study are HZSM-5 zeolites (H (4-n)x )[T n+ x Si 4+ 12−x O 24 ] × wH 2 O (hereinafter as HZSM) with Si/Al and Si/Ti silicate modules, nanocomposites in the systems of HZSM (Si/Al = 12, 25, 40, 300)-nanoscale anatase (NA/HZSM) and HZSM (Si/Al = 40, 300)-nanoscale anatase doped with transition metals (NA:M/HZSM, M = Ag, Ni, V). Methods of HZSM zeolites, NA/HZSM, and NA:M/HZSM nanocomposites synthesis and characterization are systematized based on works [16,33,34,54,[65][66][67][68][69][70][71][72][73][74][75][76] and presented in Supplementary Materials.…”

“…The photoactivity in visible light was obtained using nanocomposites based on HZSM(40) and HZSM(300) with nanosized anatase (NA) doped with transition metal ions (NA:M). NA:M/HZSM(40)-3 and NA:M/HZSM(300)-3 nanocomposites are active in the photooxidation of difenoconazole contaminants, at that, the photocatalytic activity is higher in the presence of NA:Ni/HZSM(40)-3 (Table 7) [65].…”

“…Table 7. Functional properties of NA:M/HZSM(40)-3 and NA:M/HZSM(300)-3 (data from [65]). The presence of photocatalytic processes in the NA:M/HZSM(40)-3 systems rather than adsorption ones was shown in [65] based in the analysis of kinetic curves of the pollutants decomposition in the dark and under visible light.…”

“…-An increase in relative photocatalytic activity of NA under the effect of UV irradiation in an aqueous phase for the decomposition MeO (NA/HZSM-5 (12,40,300) [54], NA/HZSM-5(2.3-2.5 wt.% Al 2 O 3 ) [55], NA:In/HZSM-5 (50)) [56]), Brilliant Red X-3B (NA/HZSM-5(2.3-2.5 wt.% Al 2 O 3 ) [57], NA/HZSM-5 [58]), Acid Green 25 (NA/HZSM-5) [59]), Acid Red 1 (NA/HZSM-5 (Si/Al = 25) [60]), degradation of aqueous phenol and p-chlorophenol (Degussa P25/HZSM-5 (30) [61]), enhancement of photocatalytic properties for (NA/HZSM-5(50) [62]) and NOx in the presence of water vapor (Degussa P25/HZSM-5(500, 200, 25) [63]), as well as photocatalytic properties under the effect of visible light in an aqueous medium with respect to MeO (NA:Fe/HZSM-5(Al 2 O 3 2.3-2.5 wt.%) [64]) and triazole fungicide difenoxazole (NA:M/HZSM-5, M = Ag, Ni, V [65]); -Improvement of adsorption properties when compared with initial HZSM-5 and NA on the recovery (in darkness) of aqueous media of P(V) ions (NA/HZSM-5 (12,40,300) [66], NA:M/HZSM-5 (40) with M = Ag, Ni, V [65]), As(V) (NA/HZSM-5 (12,40,300) [67], NA:M/HZSM-5 (40) with M = Ag, Ni, V [65]), and Se(V) (NA:M/HZSM-5 (40) with M = Ag, Ni, V [65]); -Antimicrobial properties (in darkness) with respect to Staphylococcus epidermidis, Bacillus antracoides, and Escherichia coli (NA:Ag/HZSM-5 (40) [65]); -Enhancement of catalytic properties relative to initial HZSM-5 in epoxidation reaction of allyl alcohol and allyl chloride (NA/HZSM-5 (12,40) [68]) and in the reactions of p...…”

Fabrication and Application of Zeolite/Acanthophora Spicifera Nanoporous Composite for Adsorption of Congo Red Dye from Wastewater

“…More precisely, coagulation, reverse osmosis, membrane separation, electrochemical, dilution, filtration, flotation, softening, and reverse osmosis techniques were used for this suggestion [ 15 , 16 , 17 ]. In comparison to the other methods, adsorption is the most convenient since it is inexpensive, simple, requires less maintenance, is easy to handle, and creates smaller amounts of sediment [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Among the used adsorbents, zeolite is a natural adsorbent with porous architectures.…”