This investigation identified that ion-exchange chromatography can efficiently remove iron from the leaching of ilmenite by HCl. The strong basic anionic-exchange resin IRA 410 Cl is capable of retaining the negatively charged iron chloro complex from 20% HCl leachate of ilmenite. Oxidative conversion of Fe 2+ to Fe 3+ facilitates the iron exchange to the resin, resulting in an iron-free solution of titanium oxychloride (TiOCl 2 ). This can be directly used to produce synthetic rutile. The procedure is relatively simple and generates little acid waste.
Nitrocellulose with silver nanoparticle (AgNP/NC) composite was prepared in situ using Ag(CH3CO2) and nitrocellulose without any reducing agent. The composite materials synthesized were spray coated onto glass substrates to obtain thin films. The AgNPs/NC composites were characterized by ultraviolet-visible, Fourier transform infrared, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The antimicrobial activity of AgNPs/NC composite was investigated by tube method and time-kill kinetic studies against three microbial species, including Pseudomonas aeruginosa (ATCC 27853), Staphylococcus aureus (ATCC 25923), and Candida albicans (ATCC 10231). The antibiofilm activities were qualitatively determined against all three organisms. Prepared AgNPs/NC films exhibited good antimicrobial activity and significant inhibition of biofilm development against all three microbial species. The effective dispersion of AgNPs/NC in biofilm was responsible for the significant antibiofilm activity of the prepared material. The reported AgNPs/NC composite can be used as coating additive in bacteriocidal paint which can be applied onto surfaces such as in healthcare environments.
A simple hydrothermal method was developed for the synthesis
of
Ag supported on α-titanium bismonohydrogen orthophosphate monohydrate,
Ag@α-Ti(HPO4)2·H2O (Ag@α-TiP),
using ilmenite (FeTiO3) mineral sand. The prepared nanoparticles
(NPs) were characterized using powder X-ray diffraction, high-resolution
transmission electron microscopy, energy-dispersive spectroscopy,
X-ray photoelectron spectroscopy, and diffuse-reflectance spectroscopy.
The catalytic efficiency of Ag@α-TiP NPs in the reduction of
4-nitrophenol (4-NP) to 4-aminophenol with sodium borohydride (NaBH4) in the presence/absence of ultraviolet–visible (UV–vis)
radiation was examined. The reduction rate increased when Ag@α-TiP
was present in the reaction mixture. The catalytic efficiency was
further enhanced when the reaction mixture was exposed to UV–vis
light. An ab initio molecular dynamic approach, coupled with slab
model density functional theory (DFT) calculations, was used to find
the optimal geometry for the model catalyst Ag4@α-TiP.
The formation enthalpies and binding geometries for 4-NP and 4-nitrophenolate
ion (4-NP–) on Ag4@α-TiP were calculated
using DFT.
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