The removal of oxytetracycline (OTC) from aqueous solution on modified molecular sieve via adsorption was investigated in the present work. The copper(II) modified molecular sieve had the much higher adsorbed amount than unmodified one. The bigger pore, the more adsorption sites benefitted for the a …
Direct information at a molecular level about surface products, their structure and surface distribution is vitally important to perform an efficient separation processes for mineral beneficiation.This information is equally important for the modification of surface properties of industrial minerals for various specific applications such as: …
The effects of carbonate minerals (dolomite and siderite) on the flotation of hematite using sodium oleate as a collector were investigated through flotation tests, supplemented by dissolution measurements, solution chemistry calculations, zeta-potential measurements, Fourier transform infrared (FTIR) spectroscopic studies, and X-ray …
Clay minerals are promising adsorbents for PFAS removal from contaminated water, thus it is crucial to understand the interactions between PFAS and clay minerals. This paper performed molecular dynamics simulations to reveal the complex behaviors and fundamental mechanisms of the adsorption of perfluoroalkyl sulfonic …
or molecular percent MINERAL FORMULA CALCULATIONS (cation valence in parentheses) ! SiO 2 TiO 2 (+4) ! Al 2O 3 Cr 2O 3 Fe 2O 3 (+3) ! MgO MnO FeO CaO(+2) ! Na 2O K 2O H ... PROBLEM 5: SOLID SOLUTION WEIGHT PERCENT TO FORMULA ! We are given the following chemical analysis of a pyroxene. Compute its formula: (Hint: …
Chun et al. proposed that the surface modified NPs hold a higher capacity in detaching oil droplets from the oil-wet mineral surface regardless of their abilities of interfacial tension reduction [46]. In our previous work [35], [42], the three-stage mechanism has been proposed and applied to the hybrid hydrophobic and hydrophilic surface.
Producing porous clay material by laterally propping clay mineral layers at the molecular level began in the mid-20th century. It was then demonstrated that smectites …
Depending on the experiment, 0.2 mL of a 11 mmol·L –1 ZnCl 2 solution, or 0.2 or 0.02 mL of a 1.1 mol·L –1 MgCl 2 solution were added into the dispersion tubes. …
In order to explore the adsorption characteristics of phosphorus from molecules with different molecular structures and varying number of phosphate groups on metal-modified biochar, walnut shell biochar was modified with LaCl3 to prepare lanthanum-loaded biochar (BC-La). Adsorption of four polar components, namely phytic …
La-modified CMs remove phosphate through complex interactions, electrostatic interactions, surface chemical precipitation, and electrostatic-ligand …
Molecular dynamics simulations to study the adsorption damage of modified polyacrylamide in sandstone pores. ... Although previous experiments have analyzed the adsorption of polymer solutions on various mineral surfaces. The adsorption amount is mainly analyzed from the macroscopic level, and the research on the microscopic …
Mineral composition has been tackled by considering the montmorillonite and nontronite minerals; pH effect was studied with dGMP 2− and dG + MP − nucleotides at pH = 7 and pH = 3, respectively; and mono−/di-valent cations effects were investigated by adding 0.05 M CaCl 2 salt to the initial 0.5 M NaCl solution. Conclusion
A fundamental understanding of the interactions between mineral surfaces and amphiphilic surface modification agents is needed for better control over the production and uses of mineral fillers. Here, we controlled the carboxylic acid layer formation conditions on calcite surfaces with high precision via vapor deposition. The properties of …
Polyhedral Oligomeric Silsesquioxanes (POSS)-based Hybrid Materials: Molecular Design, Solution Self-Assembly and Biomedical Applications. Linfeng Fan, Linfeng Fan. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics & Chemistry, Institute of Chemistry, Chinese Academy of Sciences, …
Surface charges and hydration are predominant properties of colloidal particles that govern colloidal stability in aqueous suspensions. These properties usually coexist and interact with each other. The correlation between the surface charge and hydration of minerals is summarized on the basis of innovative experimental, …
Clay mineral is an important material available in nature. With an increasing understanding of clay structure, montmorillonite is realized viable for an enhanced …
The adsorption of Acid Blue 80 (AB80) on the chemical modified bentonite from aqueous solutions also can be largely improved by treating the mineral with …
Modification of the surfaces of montmorillonite (Mnt) by organic molecules is an effective method for improving their affinity toward non-aqueous substances, and has …
Compared to the acid modification, the impregnation of clay minerals using base solutions for environmental purpose is seldom used. Sodium hydroxide solution was used to regenerate a spent bleaching earth from an edible oil refinery by Mana et al. . After alkali treatment, the spent bleaching earth was subsequently treated with thermal ...
Chrysotile is also a 1:1 layered silicate mineral, which is composed of Mg 6 [Si 4 O 10](OH) 8 layers formed by the combination of Si–O tetrahedron and Mg-OH octahedron 43, as shown in Fig. 2c ...
On the other hand, the chemical composition, mineral surface anisotropy, and surface modification of the aggregate phase (retouched by hydrolyzed silane coupling agent, SCA) [93,99,103,111] are ...
The research conducted by Owabor et al. also indicates that sodium hydroxide modified clay showed relatively good adsorption performance on the removal of naphthalene from the bulk solution, while ammonium hydroxide modified clay showed a slow rate of adsorption of naphthalene from the bulk solution. Corrosion of minerals in …
Importance and micronutrient requirements through the life cycle. Food and nutrients are the chemical fuel utilized by the human body for metabolic activities, growth and development ().Macronutrients including carbohydrates, proteins and lipids contribute greatly as the main sources of energy to the human body (24, 25).In contrast, …
We present a detailed investigation of the molecular structure of montmorillonite, an aluminosilicate clay with important applications in materials …
where q (mg g-1) is the amount of trichlorphon adsorbed per unit mass, q m (mg g-1) is the maximum amount of trichlorphon that can be adsorbed, K L (L mg-1) is the affinity constant of the adsorption between trichlorphon and phyllosilicate minerals, and C (mg L-1) is the equilibrium concentration of trichlorphon (Vermeer et al., 1998).The …
The engineering of crops promises a long-term sustainable solution and avoids some of the infrastructure problems that hamper the use of supplements and processing techniques (9, 10). Using breeding or molecular approaches to develop crops with higher nutrient concentrations is termed biofortification .
The molecular chain of chitosan was rigid or semi-rigid. In the solution, the molecular chain has a rod-like or nearly rod-like conformation. The molecular chain has polar groups such as hydrogen bonds, and also has optical activity, such as containing asymmetric carbon atoms. The molecule had greater anisotropy.
Dramatic changes in molecular structure, degradation pathway, and porosity of biochar are observed at pyrolysis temperatures ranging from 250 to 550 °C when bamboo biomass is pretreated by iron-sulfate-clay slurries (iron–clay biochar), as compared to untreated bamboo biochar. Electron microscopy analysis of the biochar reveals the …
Solutions of Molecular Substances in Liquids. The London dispersion forces, dipole–dipole interactions, and hydrogen bonds that hold molecules to other molecules are generally weak. Even so, energy is required to disrupt these interactions. As described in Section 13.1, unless some of that energy is recovered in the formation of new ...
Montmorillonite (MMT) and rectorite (REC) are clay minerals that consist of hydrated aluminum silicate with Si–O tetrahedrons on the bottom of the layer, Al–O(OH)2 octahedrons on the top, and various exchangeable ions such as Na+ and Ca2+ in interlayer. However, the driving force for intercalation of double-stranded DNA is not …
Evaporites are a type of sedimentary rock that forms through the evaporation of water, leaving behind dissolved minerals and salts. These rocks typically consist of minerals such as halite (rock salt), gypsum, anhydrite, and various potassium salts. Evaporites are often associated with arid or semi-arid environments where the rate …
Thallium is a highly toxic heavy metal element that can penetrate the human skin and still cause harm to the humans and the environment at low concentrations. …
Mineralized microfibril model. We apply an in silico mineralization scheme based on a Monte Carlo approach, and identify molecular structures of nascent bone for different mineral densities, from ...