Increasing HCl Concentration Research Articles

Application of Phosphonium Ionic Liquids as Ion Carriers in Polymer Inclusion Membranes (PIMs) for Separation of Cadmium(II) and Copper(II) from Aqueous Solutions.

Facilitated transport through polymer inclusion membranes (PIMs) is a promising method for simultaneous separation and removal of valuable and toxic metal ions from aqueous solutions. Recently, ionic liquids (ILs) have been used as extracting agents for metal ions due to their unique physicochemical properties. This paper presents research on the facilitated transport of cadmium(II) and copper(II) ions from aqueous chloride solutions through PIMs with phosphonium ILs as new selective ion carriers. Cellulose triacetate membranes containing o-nitrophenyl octyl ether (ONPOE) as a plasticizer and Cyphos IL 101 [trihexyl(tetradecyl)phosphonium chloride] or Cyphos IL 104 [trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate] as the ion carriers have been prepared and applied for investigations. Cd(II) ions were transported preferably from hydrochloric acid solutions containing Cu(II) ions through the PIMs. Higher selectivity coefficient of Cd(II) over Cu(II) (SCd/Cu) from 0.1 mol·dm−3 hydrochloric acid was obtained for PIM with Cyphos IL 104 as the ion carrier. The influence of HCl and NaCl concentrations in the source phase on metal ion transport across PIM doped with Cyphos 104 was studied. It was found that the initial fluxes of Cd(II) and Cu(II) increase with increasing chloride ions concentration in the source phase. The selectivity coefficient for Cd(II) over Cu(II) decreases with increasing HCl concentration in the source phase. The results suggest that the separation system presented in this paper can be useful for the removal of Cd(II) from acidic chloride solutions in the presence of Cu(II).

Novel biological and chemical methods of chitin extraction from crustacean waste using saline water

BACKGROUND Several techniques have been proposed to recover chitin from shrimp waste using large amounts of freshwater and chemicals. The standard chemical recovery of chitin was first compared by replacing fresh water with seawater. In addition, a biotechnological process with Bacillus subtilis (B1) and Bacillus licheniformis (B2) using seawater during all steps of chitin extraction was studied. RESULTS The demineralization rate (DM) was statistically significant when using seawater (P=0.000020) and chemical recovery in comparison with deproteinization (DP). Increasing HCl concentration (from 1 to 1.28 mol L−1) and reaction time (from 60 to 90 min) resulted in DM similar to fresh water (P>0.05). Highest DP rates were obtained with crude protease (B1; DP ≈74%) and (B2: DP ≈84%), when fermentation was carried out for 24 h at an enzyme/substrate ratio of 2. Maximum DP was reached (≈79% for B1 and ≈ 82% for B2) after 15 days, while DM ranged between 55 and 60%. CONCLUSION Combined enzymatic DP (with B2) followed by a chemical DM process was used to produce chitin (DP≈84%, DM≈94%) which, on transformation to chitosan, showed a degree of deacetylation equivalent to ≈ 71%. This combined approach using seawater could transform crustacean waste into chitin products of commercial value. © 2015 Society of Chemical Industry

Extraction of iron (III) from chloride leaching liquor with high acidity using tri-n-butyl phosphate and synergistic extraction combined with methyl isobutyl ketone

Separation of iron (III) from simulated chloride leaching liquor with high acidity by tri-n-butyl phosphate (TBP) and methyl isobutyl ketone (MIBK) extraction was investigated. Synergistic effect in iron extraction was found using TBP and MIBK extractant and evaluated by synergistic enhancement coefficient. Based on the physical properties and extraction ability of organic phase, the suitable composition was 70vol.% TBP and 30vol.% MIBK. Iron extraction increased with an increase in HCl concentration from 4.22mol/L to 7.74mol/L. Under optimal extraction conditions, that is, TBP volume fraction 70%, contact time 2min, temperature of 25°C, and phase ratio (O/A) 1:1, the iron extraction in one stage was above 91.0% with initial HCl concentration 5.1–5.5mol/L and iron concentration 36–39g/L, consistent with the practical chloride leaching liquor. Results showed that negligible metal ions Cr, V, Ca, Mg, Al, Mn, Ti and Si were co-extracted. The loaded organic phase can be effectively stripped by 0.1mol/L ammonia compared with other stripping reagents. Under the optimal stripping conditions: contact time 2min, reaction temperature 25°C, and phase ratio (A/O) 2:1, more than 89.0% of iron was stripped in one stage so the organic phase could be regenerated. The Fe2O3 product with high purity was prepared from the stripping solution by precipitation and calcination processes. The mechanism of iron (III) extraction using synergistic system was discussed according to FT-IR spectra results.

Computational Results Show Gas Phase Reactions Have Great Impact on the Deposition Rate of Silicon in Siemens CVD Reactors

Over 80% of solar grade silicon is produced by using Siemens process. The chemical and physical phenomenon involved in the Siemens CVD reactors is very complex. For the purpose of finding the effect of gas phase reactions on the deposition rate of silicon in Siemens CVD reactors, four different gas phase reaction routes were applied in computational simulations using a commercial software Ansys Fluent. The simulation results show that the gas phase reaction mechanisms have great impact on the predicted Si growth rates. Specifically, the silicon growth rates decrease with an increase in HCl concentration on the rods’ surfaces with a fixed surface temperature. The formation of SiCl4, however, shows insignificant impacts on the growth rate of Si, and the surface concentration of SiCl4 is not directly associated with that of HCl.

Characterization of collagen from haddock skin and wound healing properties of its hydrolysates

Collagen, one of the most abundant structural proteins found in vertebrates, has been extensively used for biomedical applications. The objectives of this study were to isolate and characterize acid-soluble collagen (ASC) from haddock (Melanogrammus aeglefinus) skins and to investigate the biological function of ASC hydrolysates in wound healing. Amino acid composition, SDS-PAGE and FTIR suggested that the ASC is most likely type I collagen with well-maintained helical structures. Both the denaturation and shrinkage temperatures of ASC isolated from haddock skins were lower than those of mammalian collagens. The average molecular weights of hydrolysates decreased with the increase in HCl concentration as well as hydrolysis times. ASC and hydrolysates with more molecules (53.8 kDa) decreased the bleeding and clotting times and promoted order 2 vessel formation effectively. All the experimental groups, including the ASC group and its hydrolysate groups, could accelerate epithelialization and shorten the wound healing time of mice. The ASC from haddock skin could therefore serve as an alternative collagen for skin wound healing.

Synthesis of octahydro-2H-chromen-4-ol from vanillin and isopulegol over acid modified montmorillonite clays: Effect of acidity on the Prins cyclization

Two calcium-rich natural layered aluminosilicates containing 90–95wt.% montmorillonite were chemically activated using 0.125–3.0M HCl solutions. Structural and textural properties were characterized by X-ray diffraction, elemental analysis and N2-adsorption/desorption analyses. According to infrared spectroscopy using pyridine as probe molecule, the amount of Brønsted acid sites increased when increasing HCl concentration. The catalytic performance of these materials was investigated in the Prins cyclization of (−)-isopulegol with vanillin to form octahydro-2H-chromen-4-ol, carried out in toluene at 35°C. It was found that the amount of Brønsted acid sites and the microporosity of the catalysts are key factors for the control of the reaction rate and the selectivity towards octahydro-2H-chromen-4-ol.

Colloidal stability and dilatational rheology at the air–water interface of peptides derived from thermal-acidic treated wheat gluten

Defatted wheat gluten proteins were subjected to a thermal process under mildly acidic conditions using 50–250 mM HCl. The degree of deamidation and hydrolysis reached in gluten proteins produced variable water-soluble fractions at neutral pH. When pH shifted from alkaline to acidic ranges, these fractions, in buffered aqueous media, developed different zeta potentials and different association/aggregation states. Interfacial rheological properties of water-soluble peptides were characterized by dilatational rheology at the air–water interface. A pendant drop tensiometer was used to produce harmonic perturbations to obtain the elastic component of the interfacial viscoelasticity modulus. Gluten proteins with the lowest degree of hydrolysis and deamidation, produced peptides with the highest interfacial elastic moduli of adsorbed films at the air–water interface. The mildly acidic treatment produced water-soluble peptides at neutral pH with different molecular weight profiles; a peptide fraction with molecular weight lower than 10 kDa increased with the increasing HCl concentration.

Extraction of Ruthenium using Both Tertiary and Quaternary Amine from Chloride Media

Ruthenium extraction from a solution bearing 0.1 g/l Ru and 0.0358 M HCl was independently carried out with Alamine 336 and Aliquat 336 in kerosene with tri-n-butyl phosphate as the phase modifier. The effect of various parameters such as concentrations of extractant, hydrochloric acid, sodium chloride and TBP on extraction of ruthenium(III) was investigated. Ruthenium extraction increased with increasing extractant concentration up to 25% beyond which it decreased. With Alamine 336, the percentage extraction increased with increasing HCl concentration up to 6 M and then it decreased, but that with Aliquat 336 increased up to 4 M, and decreased beyond that. Ruthenium extraction from 4.5 M NaCl solution using 25% Aliquat 336 and 20% TBP in kerosene was maximum and that from a 2 M NaCl solution using Alamine 336 was maximum. The extracted species for Alamine 336 and Aliquat 336 were R 3 NH + RuCl . and R 3 NCH RuCl , respectively. The effect of various diluents such as kerosene, benzene, toluene, xylene, hexane, and cyclohexane on extraction of ruthenium was studied. The extraction isotherm with 25% Aliquat 336 indicated quantitative extraction in two stages both at O:A ratio of 1:1 and 2:1. The thermodynamic parameters such as ΔH, ΔG, and ΔS were also determined.

Can pure gold be dissolved in seawater mixed with aqueous nitric acid?

In order to demonstrate further the oxidation ability of diluted aqueous nitric acid containing abundant amounts of salts, the dissolution of precious metals (Au, Pt, and Pd), especially, of gold has been examined in 0.1–2moldm−3 HNO3 accompanied by alkali metal, alkaline earth metal, and aluminum chlorides. The complete dissolution time of pure gold plate (20±2mg, 0.1mm thickness) in 2.0moldm−3 HNO3 accompanied by 1.0moldm−3 AlCl3 was shortened remarkably with a temperature increase from 15 to 80°C. The dissolution rate constants, log (k/s−1), of a piece of gold wire (19.7±0.5mg) in 20mL of 2.0moldm−3 HNO3 accompanied by the metal chlorides, in general, increase with increasing salt concentrations at 40 and 60°C. For instance, the log (k/s−1) values linearly increase from −4.15 via −3.77, −3.45 to −3.14 by the addition of 1.0., 2.0, 3.0, and 4.0moldm−3 LiCl in a 2.0moldm−3 HNO3 solution at 60°C. The gold can be dissolved in the solution of 1.0moldm−3 HNO3 and 1.0moldm−3 HCl, i.e. a “dilute aqua regia.” We have achieved a total dissolution of five pieces (0.10g) of the gold wire in 100mL of the 1:1 mixture between seawater and 2.0moldm−3 HNO3 at ca. 100°C, with a complete dissolution time of within 17h and log (k/s−1)=−4.52. At 60°C, the complete dissolution experiments of the gold wire in much lower HNO3 concentrations (down to 0.1moldm−3) with the chloride salts have been also successfully performed. The distortion of bulk water and alternation of water properties are discussed based on the Raman spectra with increasing HCl concentrations.

Ionic Conductivity and Dielectric Properties of LiBF4 Doped PMMA/ENR 50 Filled Acid Modified SiO2 Electrolytes

Abstract Incorporation of silicon dioxide (SiO 2 ) filler was proven to improve phase separation and ionic conductivity of polymethyl methacrylate/50% epoxidized natural rubber (PMMA/ENR 50) electrolytes. Unfortunately, SiO 2 was found agglomerated in PMMA/ENR 50 electrolytes thus restricting surface contact between polymer electrolytes and electrodes. Therefore, in this study, SiO 2 was chemically modified using hydrochloric acid (HCl) in order to improve dispersion of SiO 2 in PMMA/ENR 50 electrolytes matrix. SiO 2 was reacted with HCl in different acid concentrations for an hour at ambient temperature then dried in an oven for 24 hours at 120 o C. The acid modified SiO 2 (HCl-SiO 2 ) was then blended with PMMA/ENR 50-tetrahydrofuran (THF) solutions and doped with lithium tetrafluoroborate (LiBF 4 ). Polymer electrolytes were obtained by solvent casting in a Teflon dish under nitrogen gas flow then further dried in an oven. The ionic conductivity of PMMA/ENR 50 filled HCl-SiO 2 electrolytes was analyzed using electrochemical impedance spectroscopy (EIS). Activation energy ( E a ) was calculated from log ionic conductivity (log σ) versus 1000/T plot using Arrhenius equation. It was found that the ionic conductivity (σ) was slightly decreased due to the acid modification SiO 2 . However, further increase in HCl concentration lead to steady increase in the σ. The activation energy ( E a ) was found inversely proportion to the σ. Dielectric constant (ɛʹ) and dielectric loss and (ɛʺ) were found to initially decrease upon the acid modification SiO 2 . However, the ɛʹ and ɛʺ observed increases as HCl concentration increased. Real part modulus ( Mʹ ) was lower at lower frequency but increases as frequency increased. The Mʹ peaks were observed at higher frequency. The peaks shifted to higher frequency as concentration HCl increased but still at lower frequency compared to polymer electrolytes filled with unmodified SiO 2 . Nevertheless, no peak was recorded in imaginary part Modulus ( Mʺ ).

Fabrication of bionic superhydrophobic surface on X52 pipeline steel

A superhydrophobic surface was prepared successfully on X52 pipeline steel surface using the sandblasting roughening treatment, chemical etching and fluorination treatment composite methods. The pipeline steel surface was modified with(heptadecafluoro-1,1,2, 2-tetradecyl)trimethoxysilane(HFTTMS). The effects of HCl concentration and the chemical etching time on the morphology of the pipeline steel surface and the wettability of the surface with distilled water were researched. The results show that at certain HCl concentration, with the increase of the chemical etching time, the contact angles increased and had a maximum value. When the chemical etching time was too long, the pipeline steel surface reacted with HCl for too long, and the complexity of surface microstructure decreased, resulting in the decrease of the contact angle. With the increase of HCl concentration, the reaction between the pipeline steel surface and HCl became severe, the surface morphology became more complex, and the fractal dimension increased. When HCl concentration was too high, the surface fine projection structures were etched off, resulting in the decreases in the complexity and the fractal dimension of the surface structures. Therefore, the contact angle decreased. The sample sandblasted for 1.5 min and etched chemically for 1.5 h at 7 mol/L HCl can obtain the best surface fine structure. After the fluorination treatment, the biggest contact angle is 156.4°.

One Step Effective Separation of Platinum and Palladium in an Acidic Chloride Solution by Using Undiluted Ionic Liquids

Imidazolium-based ionic liquids (ILs) with Tf2N as anions were studied as extractants without dilution for the extractive separation of platinum and palladium in an acidic chloride solution. The effect of the alkyl chain length on the extraction performance was evaluated and, based on the performance, the IL, 1-methyl-3-octylimidazolium bis(trifluoromethylsulfonyl)imide ([Omim][Tf2N]), was selected to be studied in detail. The extraction of Pt(IV) underwent little change over the HCl concentration studied, while that of Pd(II) decreased with increasing HCl concentration. The separation of Pt(IV) and Pd(II) was highly effective, and the highest separation factor between Pt(IV) and Pd(II) reached 312 at the optimum conditions in a binary component system composed of Pt(IV) and Pd(II). The effect of the initial Pt(IV) concentration on loading capacity and extraction efficiency of Pt(IV) was also investigated.

Transfer Characteristics of Heavy Metal Pb in Municipal Solid Waste Incineration

The chloride, oxide and metallic species of heavy metal Pb were taken as the research objects in this paper, the effect of incineration temperature, incineration time, HCl gas and moisture on the volatilization of heavy metal Pb was discussed. The results indicate that the volatilization rates of chlorides, oxides and metallic species of heavy metal Pb increase with temperature increasing, the total volatilization rates are in the order of Pb£34PbCl2£34PbO. The effect of time on the volatilization rate of heavy metal Pb is notable before 50 minutes, and the effect of time on Pb is greater than PbCl2 and PbO. The volatilization rates of heavy metal Pb show tendency to rise with increasing HCl, the increasing degree is in the order of PbCl2£34PbO£34Pb. The volatilization rate of PbCl2 increases by an increase in HCl concentration, but if the time is enough (more than 80 minutes), then there is no effect of HCl concentration on PbCl2. The presence of moisture depresses the volatilization rates of chloride, oxide and metallic species of heavy metal Pb, the depressing degree is in the order of PbCl2£34Pb£34PbO.

Synthesis of Cu xO(x = 1,2)/amorphous compounds by dealloying and spontaneous oxidation method

CuxO(x = 1,2)/amorphous compounds have been successfully synthesized by chemical free dealloying and spontaneous oxidation method. Technological parameters, such as the acid concentration and dealloying time strongly influence the crystal type, size and morphology of coppery oxide. The further study shows that with the increase of HCl concentration, the surface coverage rate of Cu2O micro-flowers increases and the sizes of Cu2O micro-flowers get bigger. Moreover, it is observed that cracks are formed on the etched ribbon surface and plentiful Cu2O/CuO particles grow up from these crack walls if the dealloying time extends to long enough. Considering many fascinating properties of Cu2O/CuO particles and the amorphous alloy carrier, potential application fields of these amazing compounds will be developed in future.

무전해 니켈·팔라듐·금도금 표면처리 공정의 도금 번짐 불량 및 개선

무전해 니켈 팔라듐 금 표면처리 공정의 도금 번짐 불량의 근본적인 원인을 이해하고 이를 해결하기 위한 방법을 제시하였다. 이에 계산화학을 이용하여 공정을 정성적으로 설명하고 이를 바탕으로 가정을 검증하기 위한 실험을 계획하였다. 도금 번짐으로 발전되는 고분자 레진 위의 팔라듐 시드의 핵 생성을 막는 것에 초점을 맞추어 고분자 레진과 화학적으로 결합력이 약한 <TEX>$PdCl_2$</TEX> 팔라듐 촉매를 도입하였으며 이 촉매가 수용액 중에서 추가적인 가수분해 반응으로 더 안정한 <TEX>$Pd(OH)_2$</TEX>를 형성함으로써 고분자 레진 위에 팔라듐 시드의 원천으로 작용하지 않도록 염산(HCl)의 농도를 높이거나 팔라듐 활성화 공정의 온도를 낮추어 보았다. 계산화학은 매 단계 실험의 이론적인 근거를 제시해 주었으며 실험 결과를 해석하는 데 큰 도움을 주었다. 이와 같이 실험과 이론을 접목시킨 본 연구의 접근법은 관련 공정에서 매우 유용하게 활용될 수 있을 것으로 기대된다. The running blots between patterns during electroless nickel electroless palladium immersion gold (ENEPIG) surface finish of printed circuit board (PCB) are investigated and a proper solution is presented. Computational chemistry is first employed to understand the process and experiments are then designed to verify the proposed ideas. A <TEX>$PdCl_2$</TEX> activator which has relatively weak chemical bonding to the epoxy resin is introduced to prevent the formation of palladium seeds on the epoxy resin and a couple of operational measures such as increasing HCl concentration and lowering the temperature of Pd activation process are executed to prevent a further hydrolysis of <TEX>$PdCl_2$</TEX> to more stable <TEX>$Pd(OH)_2$</TEX> in aqueous solution. Computational chemistry provides thermodynamic backgrounds for experiments and their results. This combined approach is expected to be very useful in the research of relevant processes.

THE SOAKING EFFECT ON DIFFERENT HYDROCLORIDE ACID LEVEL AND SOAKING TIME ON PH, SWELLING PERCENTAGE AND COLLAGEN YIELD OF CHICKEN SHANK BONE

Collagen is the main ingredient in the gelatin manufacture. The purpose of the study was todetermine the pH value, the swelling percentage and collagen yield of chicken shank bones which weresoaked by different HCl concentration and soaking time. The pH value and swelling percentage ofchicken shank bones are indicator that determines amount of collagen yield. The research design usedwas factorial completely randomized design (CRD). Factor A was a concentration of HCl (2%, 3.5% and5%) and factor B was a soaking time (24, 36 and 48 hours) without replication (profile). The resultshows that the the increase of HCl concentration and soaking time affected on the decreasing of pHvalue profile (0.17-0.85), swelling percentage profile (80.25-97.49%) and also collagen yield (1.80-10.02%). The lowest collagen yield of chicken shank bones was suspected caused by the used of Hcl.The highest result of the study was using 2% of HCl concentration for 24 hours. The best result wasfound in the use of 2% HCl and was soaked for 24 hours. Based on those result, the collagen of chickenshank bones was recommended as a main ingredient for gelatin manufacture.

Dissolution behaviour of platinum by electro‐generated chlorine in hydrochloric acid solution

AbstractBackgroundDepletion of primary resources, stringent environmental regulations, and the requirement for energy efficient and eco‐friendly processes have created research interest in recovering Pt from secondary resources using electro‐generated chlorine in HCl solution.ResultsPlatinum dissolution rate was found to increase by a factor of 2.5 by increasing the HCl concentration from 3.0 to 5.0 mol L‐1 at 70°C, while maintaining total chloride ions at 5.0 mol L‐1 with NaCl. Increasing the aqueous chlorine concentration made no improvement to the dissolution rate. A theoretical calculation of distribution for chlorine species showed a predominance of Cl3− ions in comparison with Cl2(aq) upon increasing the acid concentration to above 5.0 mol L‐1; raising temperature also increased the dissolution rate. The activation energies of Pt dissolution in the 5.0 mol L‐1 HCl solution were 82.3 and 83.5 kJ mol‐1 at 5.0 and 15 mmol L‐1 aqueous chlorine concentration, respectively.ConclusionsEco‐friendly electro‐generated chlorine leaching was applied for the dissolution of Pt in hydrochloric acid solutions. Increasing HCl concentration and solution temperature effectively enhanced Pt dissolution during leaching. A quantitative investigation of Pt dissolution rate verified the chemical reaction control of Pt dissolution rather than mass transfer.

Effect of HCl on Spectral Properties of Sulfur Dioxide and its Derivatives Dissolved in Water

A number of studies on sulfur dioxide (SO2) in toxicology and pharmacology have been reported, however spectral properties of SO2 and its derivatives were seldom investigated. We investigated the absorption spectra of SO2, sodium sulfite (Na2SO3), sodium bisulfite (NaHSO3) and sodium metabisulfite (Na2S2O5) in aqueous solution. In the meanwhile, the effects of HCl on spectral properties of SO2 and its derivatives were also investigated. We found that gaseous SO2 in ethanol, n-butyl-alcohol and glycerol had a characteristic absorption peak at 276 nm. Na2S2O5 and NaHSO3 exhibited an absorption peak at 257 nm. Absorption of SO2 at 276 nm was strongly enhanced in the presence of HCl. NaHSO3, Na2SO3 and Na2S2O5 also exhibited absorption at 276 nm with the addition of HCl, which was enhanced with the increase of HCl concentration. Importantly, two conclusions have been reached on the basis of our results. First, we attributed the absorbing power of SO2 to SO2 molecule, rather than hydrated sulfur dioxide. Second, absorption of SO2 strongly enhanced by HCl at 276 nm was due to H+, instead of the formation of a complex SO2Cl-. Primary studies also indicated that NaHSO3 and Na2S2O5 with HCl had a similar effect as SO2 did in rat thoracic aortic rings, which prompted us believe that NaHSO3 and Na2S2O5 with HCl may be acted as a donor of SO2 in biology and other area.

Solvent Extraction of Zirconium and Hafnium from Hydrochloric Acid Solutions Using Acidic Organophosphorus Extractants and Their Mixtures with TOPO

Solvent extraction of Zr and Hf from hydrochloric acid solution was performed by using acidic organophosphorus extractants and their mixtures with TOPO. In the HCl concentration range from 1 to 4mol/dm 3 , solvation reaction was responsible for the extraction of Zr and Hf by single acidic organophosphorus extractants, such as D2EHPA, PC88A and Cyanex272. Although the extraction percentage of both metals by single and mixture of extractants increased with the increase of HCl concentration, the dependence of separation factor on the HCl concentration showed opposite behavior in both extractant systems. Synergistic extraction of Zr and Hf was obtained by the mixtures. Single Cyanex272 and a mixture of Cyanex272 and TOPO were found to be the most efficient in separating the two metals. [doi:10.2320/matertrans.M2013150]

Manipulation of the phase structure of vinyl-functionalized phenylene bridging periodic mesoporous organosilica

A series of vinyl-functionalized periodic mesoporous organosilicas (PMOs) were prepared by co-condensation of 1,4-bis (triethoxysilyl) benzene (BTEB) and triethoxyvinylsilane (TEVS) using the triblock copolymer Pluronic P123 as a template under acid conditions. It is found that the mesophases of resultant PMOs can be controlled via altering the fraction of organosilanes in the synthesis mixture and catalyst HCl concentration. With increasing fraction of TEVS, mesophase of the PMOs materials changed from p6mm to Ia3d, and then becomes a disordered material. For PMOs with 15 molar percentage of TEVS, the increase of HCl concentration can induce a transformation of mesophases from hexagonal p6mm to cubic Ia3d, whereas, a mixture of p6mm/disordered structure forms at lower acid concentration for the PMOs containing 5 % TEVS. The mechanisms of mesophase transformation were discussed based on the adsorption of TEVS into the micelles, influence of acid concentration on the hydrolysis and condensation rate, and the relative reactivities of the organosilane precursors.