Synthesis of 12-tungestophosphoric acid supported on Zr/MCM-41 composite with excellent heterogeneous catalyst and promising adsorbent of methylene blue
“…Meanwhile, there is a correlation between the AuSe QDs content and the surface area value, which was observed. It is clear from Figure 6 , the adsorption capacity of x wt.% AuSe QDs/Cs 2 Fe 2 O 4 NCs was decreased with increasing of the AuSe QDs content, which could be related to the deposition of AuSe QDs on both the surface and pores of Cs 2 Fe 2 O 4 NC [ 60 , 61 , 62 ]. Figure 6 Nitrogen adsorption/desorption isotherms of pure Cs 2 Fe 2 O 4 NC and x wt.% AuSe QDs/Cs 2 Fe 2 O 4 NCs.…”
“…Meanwhile, there is a correlation between the AuSe QDs content and the surface area value, which was observed. It is clear from Figure 6 , the adsorption capacity of x wt.% AuSe QDs/Cs 2 Fe 2 O 4 NCs was decreased with increasing of the AuSe QDs content, which could be related to the deposition of AuSe QDs on both the surface and pores of Cs 2 Fe 2 O 4 NC [ 60 , 61 , 62 ]. Figure 6 Nitrogen adsorption/desorption isotherms of pure Cs 2 Fe 2 O 4 NC and x wt.% AuSe QDs/Cs 2 Fe 2 O 4 NCs.…”
“…A number of treatment methods have been reported for removing azo dyes, for instance, biological [ 6 ], nanofiltration [ 7 ], photocatalytic [ 8 , 9 ], catalytic ozonation [ 10 ], adsorption [ 11 , 12 , 13 ], coagulation–flocculation [ 14 ], and Fenton [ 15 ] methods. Among these methods, the coagulation–flocculation method is well-established due to its low capital cost, ease of operation, and effective performance that is adaptable for high-concentration wastewater treatment [ 16 , 17 ].…”
The ability of poly-ferric-silicate-sulphate (PFSS) synthesized via a co-polymerization process has been applied for the removal of diazo Congo red dye. A novel degradation pathway of diazo Congo red dye by using PFSS is proposed based on LC–MS analysis. Diazo Congo red dye was successfully removed using synthesized PFSS at lower coagulant dosages and a wider pH range, i.e., 9 mg/L from pH 5 to 7, 11 mg/L at pH 9, and 50 mg/L at pH 11. The azo bond cleavage was verified by the UV–Vis spectra of diazo Congo red-loaded PFSS and FTIR spectra which showed disappearance of the peak at 1584 cm−1 for –N=N– stretching vibrations. The synchronized results of UV–Vis spectra, FTIR, and the LC–MS analysis in this study confirmed the significance of the Si and Fe bond in PFSS towards the degradation of diazo Congo red dye. The successfully synthesized PFSS coagulant was characterized by FTIR, SEM, TEM, and HRTEM analysis. From this analysis, it was proven that PFSS is a polycrystalline material which is favorable for the coagulation–flocculation process. Based on all these findings, it was established that synthesized PFSS can be employed as a highly efficient polymeric coagulant for the removal of dye from wastewater.
“…Adsorption is expected to be the most suitable method for recovering indium due to its simple concept, high safety and ecological process [ 14 , 31 , 32 , 33 , 34 , 35 ]. In particular, different research studies were carried out in order to find a proper adsorbent material, with higher selectivity for indium ions.…”
Indium and its compounds have many industrial applications and are widely used in the manufacture of liquid crystal displays, semiconductors, low temperature soldering, and infrared photodetectors. Indium does not have its own minerals in the Earth’s crust, and most commonly, indium is associated with the ores of zinc, lead, copper and tin. Therefore, it must be recovered as a by-product from other metallurgical processes or from secondary raw materials. The aim of this study is to investigate the adsorption properties for recovering indium from aqueous solutions using iron–magnesium composite (MgFe2O4). In addition, the results show that the material offers very efficient desorption in 15% HCl solution, being used for 10 adsorption–desorption cycle test. These results provide a simple and effective process for recovering indium. Present study was focuses on the synthesis and characterization of the material by physico-chemical methods such as: X-ray diffraction, FT-IR spectroscopy, followed by the adsorption tests. The XRD indicates that the MgFe2O4 phase was obtained, and the crystallite size was about 8 nm. New prepared adsorbent materials have a point of zero charge of 9.2. Studies have been performed to determine the influence of pH, initial indium solution concentration, material/solution contact time and temperature on the adsorption capacity of the material. Adsorption mechanism was established by kinetic, thermodynamic and equilibrium studies. At equilibrium a maximum adsorption capacity of 46.4 mg/g has been obtained. From kinetic and thermodynamic studies was proved that the studied adsorption process is homogeneous, spontaneous, endothermic and temperature dependent. Based on Weber and Morris model, we can conclude that the In (III) ions takes place at the MgFe2O4/In (III) solution–material interface.
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