Wastewater from dyestuff production is one of the main water pollutants. Several methods have been applied for remediation contaminated water. Currently, adsorption using a cheap, abundant, and environmental-friendly adsorbent such as natural clay simplest most useful method. This study aimed to determine enthalpies organic cationic dyes, methylene blue (MB) crystal violet (CV), polluted onto mineral. Early on, we performed mineralogical textural analyses sample various techniques, namely...

Encapsulation into nanoemulsion-based delivery systems of bioactive compounds characterized by low solubility in aqueous phase, represents an effective approach to improve the dispersion bioactives food products, protect them against degradation or interaction with other ingredients, reduce impact on organoleptic properties and their bioavailability. The aim present work is fabrication nanoemulsions, based natural be used as two different compounds, resveratrol curcumin, ultimate goal...

Abstract Phenolic compounds can be found in industrial or agricultural waste, such as waste water from olive mills. Because of the environmental problem caused by this residue oil production, aim work was to model effect salts on solubility four phenolic compounds. For purpose, solubilities gallic acid, protocatechuic vanillic acid and vanillin have been measured various chloride solutions at constant temperature. The Clegg–Simonson–Pitzer activity coefficient, together with dissociation...

In this work, our objective was to study the complex permittivity of binary mixtures water-ethanol, water-methanol and methanol-ethanol with various mole fractions at temperature between -35 35 °C.Measurements were made in frequency domain from 300 kHz 1.3 GHz by means an open ended coaxial line technique coupled a network analyzer. Water-ethanol display Kraszewski Law while mixture shows Shivola-Kong Law. The static dielectric constant, εs obtained plateau ε'(ω) curve, water rich or...

The partition coefficient, KOW, of some phenolic compounds, PhC, between water and 1-octanol, was determined at six temperatures from (293.15 to 318.15) K using a slow-stirring method. log KOW values protocatechuic acid, vanillic vanillin range (0.78 0.61), (1.46 1.18), (1.25 0.99), respectively, over the temperature studied. Obtained 298.15 agree well with literature data. van't Hoff plots versus T−1 exhibit linearity increasing by 13 % 21 this range. On basis fluid phase equilibrium...

Abstract The kinetic of the reaction sand with aqueous NaOH corresponding to ratio SiO 2 /Na O = was studied in a pressure vessel at 220°C and 2.7 MPa. Since curves could not be obtained directly from experimental data, new method is proposed plot entire graph data. An analytical expression type α A [1 ‐exp(‐ Bt )] describes system perfectly. constants B were calculated for silica sample having narrow granulometric distribution (range i.e. 300–315 μm). value found almost constant, between...

Congo red (CR), an anionic dye, is very harmful to the environment and should be removed via easy inexpensive technique. The adsorption of CR from aqueous solution onto a mixture illite-kaolinite clay minerals surfactant-modified was investigated at different temperatures. characterization raw organified sample confirmed with X-ray diffraction, FTIR spectroscopy, nitrogen gas 77 K transmission electronic microscopy techniques. Factors influencing such as pH, adsorbent dosage temperature were...

In the present study, porous structure of raw and calcined phosphate ore particles was examined. The specific surface area pore volume were determined by nitrogen adsorption. Raw ores leached using dilute phosphoric acid solution (4% P2O5). all cases, ESEM (Environmental Scanning Electron Microscopy) observations show that grain holds its shape ovoidale. sample heated at 780?C presented lowest 0.6 m2/g each reaction time, unreacted phases analysed XRD, FT-IR, Nitrogen adsorption...

Abstract Van der Sluis et al.'s model was used to determine the rate of partial dissolution a Tunisian phosphate rock with dilute phosphoric acid (1.5 mass% P 2 O 5 ). When temperature rises from 25 90°C, for given particle size, mass‐transfer coefficients, k L °, vary 3 × 10 −3 8 m ·s −1 . The corresponding diffusion D , lies between 6 −7 and 27 Activation energy is equal 14 kJ·mol values at 25°C, are in range 0.28 4 m·s when agitation speed goes 220 1030 rpm, showing that leaching process...

The kinetics of goethite formation from ferrihydrite was studied colorimetrically in the initial pH range 11.00−12.20 and at temperatures varying between 40 80 °C. It shown that rate crystallization is significantly influenced by aging temperature pH. apparent activation energy, calculated Barret law, close to 47.17 (± 2) kJ mol-1. kinetic data fitting performed with a heterogeneous reaction model (shrinking core model). found dependence on can be described expression r = [7.02 × 10-2...

Power ultrasound are known to enhance crystals nucleation, and nucleation times can be reduced by one up three orders of magnitude for several organic or inorganic crystals.The precise mechanism this phenomenon is yet unclear, but various theoretical explanations involve the action inertial cavitation bubbles: cooling effect, pressure segregation effect evaporation effect.All these effects sound reasonable may in fact act a complementary fashion.The mediated high pressures appearing near...

Adsorption technology is one of the most promising technologies to remove heavy metals from water.This paper aims arsenite As(III) contaminated water using a less costly, easier handle and efficient absorbent.Purified natural clay was characterized tested as an adsorbent.Mineralogical textural analysis showed that this adsorbent nonswelling mineral (illite + kaolinite) mesoporous material with specific surface area S BET = 128 m 2 •g -1 .A series batch tests were performed function contact...

Phosphates were largely used to soften process or drinking waters. We have investigated the precipitation of Ca2+ and Mg2+ ions by monosodium phosphate dehydrate. Magnesium starts precipitating at pH0 = 8.6. The obtained solids been identified chemistry analyses, FTIR spectroscopy, X-ray diffraction, thermo gravimetric analysis (TGA) differential thermal (DTA). solid phases vary with pH0. It shows that DCPD (dicalcium dehydrate, ) precipitated within 5 6.6, TCP (tricalcic phosphate) other...