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Treatment of synthetic rainwater using composite catalyst-(tio2fe2o3) by photocatalysis process

Treatment of synthetic rainwater using composite catalyst-(tio2fe2o3) by photocatalysis process / Nur Afiqah Abdullah
Kerja-kerja ini memberi tumpuan kepada sintesis, pencirian dan aktiviti fotokatalitik katalis komposit (TiO2/Fe2O3) dalam penguraian fluoranthene (FLT) dan pyrene (PYR) dengan menggunakan proses fotokatalisis heterogen. Sampel telah disintesis oleh kaedah yang murah dan bersifat alam semula jadi sol-gel dan dicirikan dengan menggunakan teknik seperti Penyebaran X-Ray (XRD), Mikroskopi Mengimbas X-Ray - Tenaga Diskriminasi X-Ray (SEM-EDX), Penyebaran UV-Vis Refleksi Spektrum (UV-Vis DRS) dan Brunauer-Emmett-Teller (BET). Air hujan sintetik digunakan di bawah keadaan eksperimen pH dan kepekatan (TiO2/Fe2O3) yang berbeza-beza. Untuk memaksimumkan kecekapan proses, kaedah permukaan respon (RSM) digunakan dengan mempertimbangkan dua pembolehubah bebas pH dan kepekatan (TiO2/Fe2O3). Dalam kajian ini, kepekatan bahan pencemar sentiasa berubah sepanjang proses rawatan. Titania yang telah dicampur ferum menunjukkan bahawa ia mempunyai kawasan permukaan (80.9 m2/g), jurang sempit (1.6 eV) dan dapat menyerap panjang gelombang di rantau yang kelihatan sehingga (> 400 nm). Penyingkiran peratusan yang tertinggi diperoleh daripada eksperimen (sebenar) untuk FLT dan PYR selepas 30 minit masa penyingkiran adalah 75 % dan 87 %, manakala selepas 60 minit masa penyingkiran, peratusan penyingkiran untuk FLT dan PYR adalah 97 % dan 92 %, berlaku dalam keadaan pH=5 dan sekurang-kurangnya pada dos 0.25 g/L (TiO2/Fe2O3). Degradasi pencemar yang diperolehi dalam kajian ini mengesahkan penggunaan cahaya matahari semulajadi yang mungkin sebagai sumber UV untuk proses fotokatalisis. _______________________________________________________________________________________________________ The present work focuses on the synthesis, characterization and photocatalytic activity of a composite catalyst (TiO2/Fe2O3) in degradation of fluoranthene (FLT) and pyrene (PYR) using heterogeneous photocatalysis process. The samples were synthesized by the inexpensive and environmentally sol–gel method and characterized by using techniques such as X-RayDiffraction (XRD), Scanning Electron Microscopy-Energy Dispersive XRay (SEM-EDX), UV–Vis Diffuse Reflectance Spectra (UV-Vis DRS) and Brunauer- Emmett-Teller (BET). Synthetic rainwater was used under different experimental conditions of pH and concentration of the (TiO2/Fe2O3). In order to maximize the process efficiency, response surface methodology (RSM) was used by considering two independent variables of pH and (TiO2/Fe2O3) concentration. In this study, the concentration of the pollutants were kept constant throughout the treatment process. The result of characterization showed that doped titania has high surface area (80.9 m2/g), narrow band gap (1.6 eV) and able to absorb wavelength in the visible region up to (>400 nm). The highest percentage of removal obtained from the experimental run (actual) for FLT and PYR 30 minutes after treatment are 75% and 87%, respectively, while for after 60 minutes of treatment for FLT and PYR are 97% and 92% respectively, occurs at optimum condition of pH=5 and minimum dosage of (TiO2/Fe2O3) of 0.25 g/L. The degradation of pollutants obtained in this study confirmed the feasible use of natural sunlight as the UV source for the photocatalysis process to take place.
Contributor(s):
Nur Afiqah Abdullah - Author
Primary Item Type:
Final Year Project
Identifiers:
Accession Number : 875008338
Language:
English
Subject Keywords:
synthesis; composite; photocatalysis
First presented to the public:
6/1/2019
Original Publication Date:
9/27/2019
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Civil Engineering
Citation:
Extents:
Number of Pages - 93
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2019-09-27 16:58:11.683
Submitter:
Mohd Jasnizam Mohd Salleh

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Treatment of synthetic rainwater using composite catalyst-(tio2fe2o3) by photocatalysis process1 2019-09-27 16:58:11.683