Synthesis and Characterisation of Penta‐Bismuth Hepta‐Oxide Nitrate, Bi₅O₇NO₃, as a New Adsorbent for Methyl Orange Removal from an Aqueous Solution

Abstract

This paper presents the synthesis of penta-bismuth hepta-oxide nitrate, Bi5O7NO3, via the chemical precipitation method. After calcination, the precipitate was characterised by several methods, which included X-ray powder diffraction, X-ray photoelectron spectroscopy, scanning and transmission electron microscopy, Fourier transform infrared, thermogravimetric analysis, BET surface area and pH drift method to determine the pH of point of zero charge (pHpzc). The study results revealed that Bi5O7NO3had an orthorhombic crystal structure, a surface area of 1.6 m2 g-1 and a point of zero charge at pH 9.7. The chemical state of Bi5O7NO3indicated the presence of three oxidation states of bismuth centre. Furthermore, the decolourization ability of Bi5O7NO3to remove the azo dye was also evaluated. Although it had lower surface area, the removal efficiency was extremely good. This finding suggests that Bi5O7NO3could be used as a promising adsorbent for azo dye removal. The XPS spectra showed that the accumulation of dye onto Bi5O7NO3could be due to the anion exchange process, suggesting the birth of a new anion exchanger for azo dye removal.

Insight into the relationship between redox ability and separation efficiency via the case of α-Bi2O3/Bi5NO3O7

“…16 Among Bi-based catalysts, Bi 5 O 7 NO 3 is formed by a 2 1 ½Bio þ layer and a 1 1 ½Bi 4 O 8 4À layer that form a framework, which is embedded with nitrate groups. 17 The unique structure of Bi 5 O 7 NO 3 has attracted research attention. Kodama et al 18 synthesized Bi 5 O 7 NO 3 by thermolysis of Bi(NO 3 ) 3 •5H 2 O in an alkaline environment.…”

“…16 Among Bi-based catalysts, Bi 5 O 7 NO 3 is formed by a layer and a layer that form a framework, which is embedded with nitrate groups. 17…”

Single-Step Topochemical Synthesis of NiFe Layered Double Hydroxides for Superior Anion Removal from Aquatic Systems

“…The high-resolution XPS spectra of O 1s, Ni 2p, and Fe 2p are given in Figures c, d, and e, respectively. For the O 1s region, the curve was fitted with four components, including O 2– of metal oxides (denoted as M–O, 530.8 eV), interlayer carbonate groups (denoted as CO 3 2– , 531.4 eV), metal hydroxides and hydroxyl groups (denoted as OH – , 531.5 eV), and physical and chemical absorbed water molecules (denoted as H 2 O, 532.5 eV). , The additional peaks corresponding to phosphate (PO 4 3– ) and nitrate (NO 3 – ) ions were found at 531.0 and 531.6 eV, respectively. , The percentage of each component calculated by using the fitting area and the values are listed in Table S8. After anionic adsorption, the peak areas of M–O and CO 3 2– significantly decreased, suggesting that the interaction occurred via these components.…”

Electronic band structure of Bi5O7NO3 and its methyl orange removal mechanism

“…Therefore, the structural features of Bi5O7NO3 were the center of the previous experimental investigations. In detail, Abdullah et al successfully synthesized Bi5O7NO3 using a chemical precipitation method [3]. Characterization techniques revealed that the point of zero charge of Bi5O7NO3 in the orthorhombic crystal structure was found to be 9.7 implying that the positively charged surface of Bi5O7NO3 occupied a wide range of pH [3].…”

“…In detail, Abdullah et al successfully synthesized Bi5O7NO3 using a chemical precipitation method [3]. Characterization techniques revealed that the point of zero charge of Bi5O7NO3 in the orthorhombic crystal structure was found to be 9.7 implying that the positively charged surface of Bi5O7NO3 occupied a wide range of pH [3]. Bi5O7NO3 has a narrow band gap in the energy range of 2.7-2.9 eV with high charge carrier mobility, so it is a good photocatalyst for utilizing visible light [4].…”