SG-TETA2 had higher overall adsorption capacities compared to silica-gel-based hyperbranched polymers functionalized by diethylenetriamine and is a practical adsorbent in removing Au(III) ion from e-wastes and industrial effluents with much prospect. To further increase the quantity and density of functional groups on adsorbent, terminal …
This paper describes a process for improving the gold(I) adsorption capacity of mercapto-functionalized silica gel (MP-SG) by using ethylenediamine (en) as an additive to mask …
Both the silica gel and silica gel with attached organo-silanes (e.g., 3-aminopropyl silica gel) are available commercially under various brands and have been functionalized further for adsorption ...
Semantic Scholar extracted view of "One-pot synthesis of silica-gel-based adsorbent with Schiff base group for the recovery of palladium ions from simulated high-level liquid waste" by Hao Wu et al. ... Covalent organic frameworks constructed by flexible alkyl amines for efficient gold recovery from leaching solution of e-waste. Li Zhang …
Bis(3-aminopropyl)amine bonded silica gel (BAPA-SG) was synthesized and characterized by elemental analysis and FT-IR spectroscopy, and tested for adsorption, preconcentration, and recovery of Pd(II) ions. The effective parameters on the preconcentration of Pd(II) ions such as pH, volume, and flow rate of the Pd(II) solution, …
Silica gel formation is one of the most common problems in hydrometallurgical processing of silica containing resources such as BR with 7 wt. % Si content which deteriorates sample handling and ...
Activated carbon is crucial in recovering gold from cyanide leach solutions in gold mining operations. This process, known as carbon-in-leach (CIL) or carbon-in-pulp (CIP), relies on the adsorption properties of activated carbon to …
A novel, one-pot sol–gel preparation scheme leading to reproducible incorporation of 20–40 nm sized gold nanoparticles (AuNPs) in SiO2 gels is developed based on in situ reduction during gelation using chloroauric acid and ascorbic acid. Variation in the preparation conditions affects the chemical composition, optical properties and …
Silica-gel (Figure 1A) shows some characteristic bands at 3,441 cm −1 ... Mechanisms of gold recovery from aqueous solutions using a novel tannin gel adsorbent synthesized from natural condensed tannin. Water Res. 39, 4281–4286. 10.1016/j.watres.2005.06.036 ...
This temperature-dependence resulted in composites ranging from highly oxygenated polymerised bio-oil composites at 300 C to aromatic carbonaceous materials covering …
Silica gel (SG) was modified using 3-mercaptopropyl trimethoxysilane (MPTMS) and used as an adsorbent for the recovery of gold(I) from a thiosulfate solution, based on the hard and soft acids and bases theory. The interfacial properties of the mercaptopropyl-functionalised silica gel (MP-SG) and its performance for the adsorption of gold(I) from …
What is Silica Gel. Silica Gel is an inert, amorphous form of silica, synthetically manufactured from the chemical reaction between sulfuric acid and sodium silicate. The internal structure of silica gel is composed of a vast network of inter-connected microscopic pores. Standard silica gels can adsorb more than 40% of their own weight of water.
Do not heat Indicating Silica Gel to more than 125-150° C because it will lose its indicating ability. Do not heat any Silica Gel to more than 200° C as its fine internal structures will be destroyed. The Silica …
Fabrication of Triethylenetetramine Terminal Hyperbranched Dendrimer-Like Polymer Modified Silica Gel and Its Prominent Recovery Toward Au (III) ... of bio-adsorbents for gold recovery from acidic.
The recovery of silica gel from blast furnace slag has been attempted by leaching with H 2 SO 4, separation of gypsum, precipitation of silica gel at pH 3.2, followed by the washing of the raw ...
Sui et al., investigated the removal and recovery of o-xylene using silica gel and a vacuum swing adsorption (VSA) process. Experiments showed that, at 5:1 for height to diameter ratio (H/D), ...
Semantic Scholar extracted view of "Recovery of silica gel from blast furnace slag" by M. Seggiani et al. ... Utilisation of steel slags as neutralising agents in biooxidation of a refractory gold concentrate and their influence on the subsequent cyanidation. C. Gahan J. Sundkvist F. Engström Å. Sandström. Environmental Science, Materials ...
A new method has been developed for the determination of gold based on separation and preconcentration using silica gel modified with benzoylthiourea. The optimum experimental parameters for preconcentration of gold, such as acid concentration, sample flow rate, eluent and matrix ions, have been investigated. Gold could be …
Gold recovery from aqueous solution was studied in the present work. Two synthetic materials composed of immobilized chelating agent on silica gel, and the …
The modified silica gel could adsorb Pd(II) ions quantitatively from the solutions up to 400 mL at pH 1.0 by the flow rate of 5 mL/min. The retained Pd(II) ions could be easily eluted by using 5 mL of 1% (m/v) thiourea in 1.0 M HCl solution. The recovery of Pd(II) ions was 95 ± 2% at 95% confidence level.
Two syntheticmaterials composed of silica gel joint to a strong chelating agent were used as reducing agents to induce gold colloid nanoparticle formation: ethylene …
Abstract A new adsorbent was synthesized via functionalizing nano-silica with 4-(aminomethyl) pyridine for selective recovery of gold. The adsorbent was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy and transmission electron microscopy, and BET (surface …
Two synthetic materials composed of silica gel joint to a strong chelating agent were used as reducing agents to induce gold colloid nanoparticle formation: ethylene diamine tetraacetic acid and diethylene triamine pentaacetic acid, together with brown …
The silica gel was synthesized using the acidification of sodium silicate solution.Silica recovery was promising based on the comparison of the silica content before and after the process, with ...
Recovery of gold from various waste materials is mostly achieved through hydrometallurgical methods, which generate a large amount of secondary chemical waste. Therefore, there is a need to develop an environmentally friendly process for gold recovery. ... (Ferro-Garcia et al. 1988), silica-gel (Kocjan 1992), fly-ash (Yadava et al. …
Silica gel (SG) was modified using 3-mercaptopropyl trimethoxysilane (MPTMS) and used as an adsorbent for the recovery of gold(I) from a thiosulfate solution, based on the hard and soft acids and ...
Two new adsorbents were synthesized by covalently grafting 2,3-Bis(2-formylphenoxy)-propan-1-ol (BH) onto the surface of silica-coated magnetic nanoparticles and silica gel by a conventional ...
Silica Gold is a bioavailable potassium and silicon formula. It provides soluble silicon in a form that plants can immediately uptake and transport to the outer layers of the cell walls, where it is needed the most. The core …
This paper presents an up-to-date overview of the various advanced materials as adsorbent used in the recovery of precious metals from wastewater. The precious metals concentrated here include gold, silver, palladium and platinum, whose recovery is interesting mainly due to their vast industrial applications and high market prices. Among …
The thermodynamic parameters free Gibbs energy (ΔG0), enthalpy (ΔH0), and entropy (ΔS0) were evaluated on the basis of the van't Hoff equation. On the basis …