توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Decolorization of reactive blue dye 19 from Aqueous solution by a strong oxidation agent
نویسنده(ها): ،
اطلاعات انتشار: همایش تخصصی نمک زدایی آبهای شور، لب شور و تصفیه پساب، سال
تعداد صفحات: ۸
The use of conventional textile wastewater treatment processes becomes drastically challenged toEnvironmental engineers with increasing more and more restrictive effluent quality by water authorities. Oxidation processes hold great promise to provide alternative for better treatment and protection of environment. It was found that catalytic activity of this catalyst was significantly enhanced under acidic conditions. In this study application of Ce(IV) for decolorization of reactive blue 19 (RB19) was investigated. Ce(IV) could absorb the reactive blue dye 19 from aqueous solution. The concentrations of dyes change exponentially with time. Batch experiments were performed to investigate the effect of operating parameters, such as pH (pHoptimum<1), type of acid (sulfuric acid, nitric acid, choloridric acid, phosphoric acid), dose of cerium sulfate (optimum dose: 1.2 g\L), initial dye concentration (10–1000 mg\L) ,contact time (1–300 sec). Isotherm studies were carried out and the data were analyzed by Langmuir, Freundlich and Temkin equations. Three simplified kinetic models were tested to investigate the adsorption mechanism. The Langmuir equation was shown to fit degradation kinetics in most cases.<\div>

۲Removal of reactive red 198 from aqueous solution by Ce(IV)
نویسنده(ها): ،
اطلاعات انتشار: همایش تخصصی نمک زدایی آبهای شور، لب شور و تصفیه پساب، سال
تعداد صفحات: ۸
The textile dyeing industry consumes large quantities of water and produces large volumes of wastewater from different processes in dyeing and finishing processes. At present, rare earth application in wastewater treatment has become more and more widely, according to the fact that the Ce(IV) has the strong oxidation ability under acid condition, we have studied the application of Ce(IV) in dyeing industry wastewater treatment originally. Ce(IV) formed [Ce(OH)x·nH2O](4–x)+after hydrolyzation and Ce (III)obtained after Ce(IV) reduction formed [Ce(OH)x·nH2O](3–x)+ after hydrolyzation, these hydrate had big specific surface area, could absorb the reactive red dye 198 (RR198) from aqueous solution. Batch experiments were performed to investigate the effect of physico–chemical parameters, such as pH (pHoptimum<1), type of acid ( sulfuric acid, nitric acid and chloridric acid), dose of cerium sulfate (1.2 g\L), initial dye concentration (10–1000) based on contact time (90–600 sec). Equilibrium data were analyzed using Langmuir ,Freundlich and Temkin isotherm models, hence equilibrium data fitted well with the Langmuir isotherm model. The Ce(IV) was one kind of latent good water treatment chemical reagent.<\div>

۳Removal of turbidity from synthetic cutting oil wastewater by a strong oxidizing agent
اطلاعات انتشار: همایش تخصصی نمک زدایی آبهای شور، لب شور و تصفیه پساب، سال
تعداد صفحات: ۷
On a purely comparative basis, the physico–chemical and turbidity treatment of cutting oil emulsion was applied to two different mineral oils (A and B). In this study, the results show that Ce(IV) had a strong ability to remove turbidity of cutting oil wastewater, at the same time, Ce(IV) could form a larger surface area of sediment, which could adsorb and flocculate oily species and suspended solids and so on. Therefore, Ce(IV) is a double–effect of water treatment agent. At present, rare earth application in waste water treatment has become more and more widely, according to the fact that the Ce (IV) has the strong oxidation ability under acid conditions; we have studied the application of Ce (IV) in cutting oil waste water treatment originally. Batch experiments were performed to investigate the effect of operational parameters, such as initial pH (pH optimum<1), type of acid, dose of cerium sulfate (1 g\L), initial cutting oil concentration (100–10000) based on constant contact time (0.5hr), the removal turbidity efficiency reached over 99%. The Ce (IV) was one kind of latent good water treatment chemical reagent. Oxidation process hold great promise to provide alternative for better treatment and protection of environment. It was found that catalytic activity of this catalyst was significantly enhanced under acidic conditions to provide a treating method of spent cutting oil–containing waste water, without sludge and is industrially advantageous. The final turbidity of cutting oil A wastewater reduced to 1.5 NTU which meet discharge standard.<\div>

۴Removal of acid dyes by Fenton process
نویسنده(ها): ،
اطلاعات انتشار: اولین کنفرانس ملی راهکارهای دستیابی به توسعه پایدار، سال
تعداد صفحات: ۴
In this investigation Fenton process was applied to oxidize two commercial acid dyes, namely Acid Red 18, Acid Blue 62. This investigation reveals that this method can remove the color of these dyes completely. Moreover it only produces little sludge in wastewater that meet local effluent standards and do not need to further treat. The effects of Fe2+, H2O2 and solution pH on dye de–colorization are demonstrated in detail pHopt: 3.0 . Increasing the dose of FeSO4 enhances the dye de–colorization. The optimal levels of H2O2 required for the process are also examined. High levels of H2O2 appear to reduce dye de–colorization.<\div>

۵decolorization of synthetic blue dye solution by advanced oxidation process AOP
نویسنده(ها): ،
اطلاعات انتشار: پانزدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۴
In this study, we used advanced oxidation process (Fenton, Fenton–like and ammonium per sulfate (APS) methods) for the removal of a cationic and anionic blue dyes, the Basic Blue 3 (BB3) and Acid blue 62(AB62), from aqueous solutions. AOPs reactions are mixture of H2O2 or ammonium per sulfate as a oxidizing reagents with metal catalysts. The formed hydroxyl radicals and sulphate radical anion led to the oxidative degradation of BB3 & AB62. The results show that the optimum amounts of Fenton and Fenton –like reagent was 5.6 mg\ L as a metal catalyst ion and 1 g\L of H2O2, In (APS) reactions 50 mM of ammonium per sulfate concentration for an initial dye concentration at 50 mg\L were used.In these reactions, It was found that the re moval of dye was enhanced using pH 3.0. The best reagent for AB62 dye was FeCl2.4H2O and for BB3 dye was NH4Fe(SO4)2 .%Removal of AB62&BB3 were up to ٪99.9.<\div>

۶Removal of acid red 151 dye from aqueous solution using palm shell by adsorption:IsothermAdsorption studies
نویسنده(ها): ،
اطلاعات انتشار: سومین کنفرانس بین المللی علوم و مهندسی، سال
تعداد صفحات: ۱۰
The objective of this research is removal of Acid Red 151(A.R.151) from aqueous solutionusing palm shell as low–cost adsorbent. The operating parameters such as pH solution, doseof adsorbent, initial dye concentration were investigated. Results showed that pH: 3, dose ofadsorbent: 2g\L and initial dye concentration: 20mg\L were the most suitable. In this study,the best fit of the adsorption isotherm data was obtained using the Langmuir model and showfavorable adsorption of A.R.151 dye with separation factor (0 < RL < 1).<\div>
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