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Synthesis of hydrophobic tio2-pvdf membrane distillation for nutrient isolation

Synthesis of hydrophobic tio2-pvdf membrane distillation for nutrient isolation / Siti Sarah Muhammad Takudin
Membran penyulingan (MD) adalah satu proses pemisahan yang digunakan untuk mengangkut molekul daripada permulaan proses yang meruap dari suhu tinggi ke bahagian suhu rendah dengan meresap melalui liang membran yang hidrofobik. Ia telah digunakan secara meluas dalam pelbagai aplikasi seperti penyulingan air laut dan rawatan air sisa memandangkan ia memberi kelebihan utama berbanding dengan proses pemisahan yang lain. Tetapi, halangan utama untuk mendapatkan kecekapan pemisah yang tinggi daripada membrane hidrofobik yang berliang dalam MD ialah pembasahan liang yang masih berlaku dalam MD terutama dalam rawatan tinggi kemasinan air sisa. Untuk mengelakkan pembasahan liang daripada berlaku, hidrofobik membran perlu ditingkatkan dan pada masa yang sama, saiz liang perlu dikurangkan. Untuk meningkatkan hidrofobik membran, polimer PVDF telah digunakan bersama-sama dengan TiO2 dan agen gandingan silana melalui pengubahsuaian kimia, iaitu dari kaedah pengadunan dan dari kaedah pemendakan setempat. Kajian mendapati bahawa sudut bersentuhan atau membrane yang hidrofobik boleh didorong dengan menambah TiO2 bersama silana ke dalam matriks PVDF itu. Walau bagaimanapun, membran TiO2-PVDF bersama silana yang disediakan melalui pengadunan kaedah lebih praktikal untuk digunakan dalam proses penyulingan membran bersentuhan secara langsung berbanding dengan kaedah pemendakan setempat kerana ia mempunyai fluks yang tinggi (11.12 kg / m2.h), kecemerlangan penyingkiran nutrien 99,65%, nilai LEPw tinggi (3.46 bar) dan saiz liang kecil (0.16μm) yang boleh mengurangkan kemungkinan pembasahan liang. _______________________________________________________________________________________________________ Membrane distillation (MD) is a separation process used to transport volatile molecules from high temperature feed solution to the low temperature permeate side across a porous hydrophobic membrane. It has been widely being used in various applications such as seawater distillation and wastewater treatment as gives major advantages compared to other separation process. But, the main obstacles to obtain high separating efficiency in the MD from the porous hydrophobic membrane are the pore wetting which still takes place in MD especially in the treatment of high-salinity wastewater. To prevent pore wetting from occurs, the hydrophobicity of the membrane need to be increased and at the same time, the pore sizes need to be reduced. To enhance the hydrophobicity of the membrane, PVDF polymers were prepared together with TiO2 and silane coupling agent via chemical modification, blending and in situ precipitation method. It was found that the contact angle or hydrophobicity of the membranes can be induced by adding silanized TiO2 into the PVDF matrix. However, silanized-TiO2-PVDF membrane prepared via blending method is more practical to be used in direct contact membrane distillation process compared to in-situ precipitation method as it has relatively high flux (11.12 kg/m2.h), excellence nutrient removal of 99.65%, high LEPw value (3.46 bar) and small pore size (0.16μm) which can reduce the possibility of pore wetting.
Contributor(s):
Siti Sarah Muhammad Takudin - Author
Primary Item Type:
Final Year Project
Identifiers:
Accession Number : 875005681
Language:
English
Subject Keywords:
(MD); hydrophobic; wastewater
First presented to the public:
6/1/2015
Original Publication Date:
8/13/2020
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Chemical Engineering
Citation:
Extents:
Number of Pages - 60
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2020-08-13 12:36:50.306
Submitter:
Mohd Jasnizam Mohd Salleh

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