In this study, the relationship between morphology, porosity, and photocatalytic activity of anatase phase TiO2 was investigated. The synthesis samples carried out by a modified sol–gel method, using two ionic surfactants (sodium dodecyl sulfate (SDS) cetyltrimethylammonium bromide (CTAB)), polyethylene glycol (PEG) as nonionic surfactant, or no surfactant (NS). addition, activities were investigated through adsorption experiments photodegradation methylene blue. experimental results showed...

Coal is one of the most important sources for energy generation. In order to reach buyer or legislation requirements, and prevent environmental pollution, coal must be washed by processes such as froth flotation remove mineral matter increase quality. Different techniques X-ray diffraction artificial vision are employed monitor flows during washing process; nevertheless, these require high-cost equipment qualified personnel perform analysis; also, data interpretation a time-consuming task....

Titanium oxide (TiO2) is of great interest for the manufacture solar cells, hydrogen production and photodegradation organic compounds. The synthesis variables, as well type method, affect morphology, texture, crystalline structure, phase mixtures TiO2, in turn, these optical catalytic properties TiO2. In this work, role acetic acid a catalyst chelating agent on crystal properties, photocatalytic activiy TiO2 samples obtained by sol gel method assisted with sodium dodecyl sulfate template...

In this study, the effect of martensite volume fraction on mechanical, tribological, and corrosion properties API 5CT dual-phase steel is studied based intercritical heat treatment routes at different temperatures (730, 760, 790 °C). Hardness specimens increased by increasing up to 50%. Further increase in led an wear resistance. Sliding pin-on-disk tests were analyzed following ASTM G99 standard, obtaining rate, lost mass, Archard coefficient as a function time temperature treatment. A...

This work presents the hydrogen evolution produced by flexible graphene composites (FGCs) fabricated a casting method. Ni(OH)2 nanoparticles were also grown on FGCs using wet chemical Those present spherical shapes and are uniformly distributed surface of FGCs. The generation activity in water for with without was UV light excitation. decorated had rate 2.66 times higher than nanoparticles. It observed that is oxidized during photocatalytic process (formation oxide); this turn helped to...

Precipitation hardening aluminum alloys are used in many industries due to their excellent mechanical properties, including good weldability. During a welding process, the tensile strength of joint is critical appropriately exploit original properties material. The processes still under study, and gas metal arc (GMAW) pulsed metal-transfer configuration one best choices join these alloys. In this 6061 alloy by GMAW was performed two heat treatment conditions using filler metals, namely: ER...

Abstract Sulfide minerals are one of the most important sources metal values. On other hand, some sulfides such as pyrite considered major impurities in solid fossil fuels coal. Oxidation these has been route to obtain base metals and remove sulfur by leaching. This work summarizes results obtained regarding use ozone oxidation sulfide ores containing gold, silver, copper. Results show that extraction gold silver is increased at least 15%, with lower cyanide consumption; copper 16% less...

In this work it was possible to synthesize novel CSH-nylon 6/66 nanocomposites using a simple and easy methodology such as the solution mixing method green solvents like water, formic acid ethanol.

The present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted atmospheric-pressure low-pressure reactors, respectively. Leaching precipitation iron was achieved same stage using different reagents like Fe3+, O2, O3, Fe2+ (which is continuously oxidized solution by H2O2 O2). highest percentage extraction (96%) obtained H2SO4, Fe2+, O2. Experimental results compared with those other researchers to provide...

Cellulose nanomaterials are one of the most relevant scientific-technological discoveries in recent years. nanocrystals (CNCs) stand out among them because their extraordinary chemical, mechanical, thermal, and optical properties make an interesting alternative to manufacture advanced materials from abundant biopolymer on Earth. This work presents a critical analysis literature published last years, emphasizing various obtaining processes that have emerged search for greener methods. A...

Jarosites are residues generated during the purification of zinc and composed mainly iron sulfates ((Na, K)Fe3(SO4)2(OH)6). Due to large volume jarosite process, these tend be deposited in land areas not used. In present work, was used without heat treatment (JST) as an adsorbent hexavalent chromium contained a sample wastewater from chrome plating industry under following conditions: C0 = 200 mg/L Cr, T 25 °C, pH 3. It only possible remove 34% Cr (VI). Subsequently, thermal (JTT) carried...

In this work, we reported obtaining mesoporous Bi-doped TiO2 by mechanosynthesis and bismuth loading of 0%, 1%, 3%, 5%, 10% (milled TiO2, Bi 3% 10%, respectively). The effect doping ball milling on the crystal structure, optical properties, photocatalytic performance samples under UV, visible, sun irradiation was investigated. According to results Rietveld refinement, estimated chemical formulas for Bi10% were Ti0.99Bi0.01O2, Ti0.97Bi0.03O2, Ti0.96Bi0.04O2, Ti0.91Bi0.09O2 respectively....

Beige kaolin clays were crushed and sieved. The mineral was characterized by X-ray diffraction chemically analyzed atomic absorption spectrophotometry. material below 37 microns leached with oxalic acid. A study of main variables the leaching process in different ranges realized: time (0 to 120 min), temperature (25 100 °C) acid concentration (0.01 0.5 M). Crystallographic analysis initial sample indicates presence kaolinite, iron oxides form magnetite iron-titanium oxides. By this method it...

Slags, sludges, and dust from steelmaking industries have been probed as adsorbents for Pb(II) removal synthetic water solutions, these residues showed good potential in the treatment of industrial effluents contaminated with this heavy metal. Adsorption precipitation postulated main mechanisms to remove aqueous solutions by using residues. The significant effect pH on has well studied but few studies explicitly address chemical mineralogical composition a better understanding key parameter...

This work reports the synthesis, characterization, and in vitro release studies of pH- temperature-sensitive Fe3O4-SiO2-poly(NVCL-co-MAA) nanocomposite. Fe3O4 nanoparticles were prepared by chemical coprecipitation, coated with SiO2 Stöber method, functionalized vinyl groups. The copolymer poly(N-vinylcaprolactam-co-methacrylic acid) (poly(NVCL-co-MAA)) was grafted onto Fe3O4-SiO2 free radical polymerization. XRD, FTIR, TGA, VSM, TEM techniques performed to characterize behavior Doxorubicin...

Several attempts have been made to optimize the process and reduce operating costs of acid leaching low grade sulphide copper ores. In this study, we conducted acidic low-grade chalcopyrite by using ferric ion ozone as oxidants, at 25°C. particular, used a Taguchi L9 experimental design (four factors, three levels) determine effects particle size, sulphuric concentrations ([Fe+3] [H2SO4]) (O3) mass flow rate, on amount extracted. Statistical analysis showed that [Fe+3] had greatest effect...