Outline

  • Abstract
  • Keywords
  • 1. Introduction
  • 2. Experimental
  • 2.1. Materials
  • 2.2. Blending of Polymers
  • 2.3. Membrane Preparation
  • 2.4. Uf Set Up
  • 2.5. Membrane Characterization
  • 2.5.1. Compaction
  • 2.5.2. Pure Water Flux
  • 2.5.3. Water Content
  • 2.5.4. Membrane Hydraulic Resistance (rm)
  • 2.5.5. Protein Rejection Studies
  • 2.6. Thermal Studies
  • 2.6.1. Thermo Gravimetric Analysis (tga)
  • 2.6.2. Differential Scanning Calorimetry (dsc)
  • 3. Results and Discussion
  • 3.1. Membrane Compaction
  • 3.2. Pure Water Flux
  • 3.3. Water Content
  • 3.4. Membrane Hydraulic Resistance (rm)
  • 3.5. Protein Rejection Studies
  • 3.6. Thermal Studies
  • 3.6.1. Thermo Gravimetric Analysis (tga)
  • 3.6.2. Differential Scanning Calorimetry (dsc)
  • 4. Conclusion
  • References

رئوس مطالب

  • چکیده
  • 1.مقدمه
  • 2.بخش آزمایشگاهی
  • 1.2مواد
  • 2.2ترکیب پلیمرها
  • 3.2آماده سازی غشا
  • 4.2. تنظیم و ستاپ UF
  • 25.2.تعیین خصوصیات غشا
  • 1.5.2.فشردگی
  • 3.5.2.مقدار آب
  • 4.5.2.مقاومت هیدرولیکی غشا (Rm)
  • 6.2.مطالعات گرمایی
  • 1.6.2.آنالیز گرمایی
  • 2.6.2.کالریمتری روبشی افتراقی
  • 3.نتایج و بحث
  • 1.3.فشردگی غشا
  • 2.3شار آب خالص
  • 3.3.مقدار آب
  • 4.3.مقاومت هیدرولیکی غشا (Rm)
  • 5.3مطالعات انتقال (rejection) پروتئین
  • 6.3مطالعات گرمایی
  • 1.6.3 بررسی های گرما، وزن سنجی
  • 2.6.3.کالوریمتری روبشی گرمایی (DSC)
  • 4. نتیجه گیری

Abstract

Cellulose acetate (CA) membranes are used in ultrafiltration applications, although they show low chemical, mechanical and thermal resistance. In order to prepare membranes with improved properties, modification of cellulose acetate with polyethylene glycol (PEG 600) has been attempted. In this study, CA has been mixed with PEG 600 as an additive in a polar solvent. The effects of CA composition and additive concentration given by a mixture design of experiments on membrane compaction, pure water flux, water content and membrane hydraulic resistance have been studied and discussed. The efficiency of protein separation by the developed CA membranes have been quantified using model proteins such as pepsin, egg albumin (EA) and bovine serum albumin (BSA). The thermal stability of the developed membranes prepared with PEG 600 additive has also been investigated using thermogravimetric analysis and differential scanning calorimetry.

Keywords: - - - - -

Conclusions

Various membranes with CA and PEG 600 have been prepared using mixture design of experiments concept for enhancing ultrafiltration membrane characteristics such as pure water flux, water content and membrane hydraulic resistance. It is found that the CA composition, the presence of hydrophilic additives (PEG 600) and their concentration play a key role in changing the membrane characteristics since the resulted membranes possess changes in porosity and pore size. Protein rejection studies reveal that the increase in additive concentration has a direct influence on the permeate flux as well as percentage rejection values. It is seen that PEG 600 has significant role in altering the thermal properties, especially thermal stability, of the developed membranes. There seem to be a positive linear relation between the additive concentration and Tg, although the percentage of CA has some influence.

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