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Done By: Chemical Engineering Department
Post Date: 2025-02-10
Last Browse: 2025-04-01
The Chemical Engineering Department at Al-Nahrain University discussed the doctoral thesis of student Hanan Hashim Abid titled:
" Organic-inorganic Semiconductor Heterojunctions as Efficient Photocatalyst For Organic Pollutant Degradation."
The discussion committee, which took place in the Chemical Engineering Department Council Hall/College of Engineering on Monday, February 10, 2025, consisted of the following members:
1. Prof. Dr. Shahlaa Ismail Ibrahim – College of Engineering, University of Baghdad – Chair
2. Asst. Prof. Dr. Yasser Imad Abdulaziz – College of Engineering, Al-Nahrain University – Member
3. Asst. Prof. Dr. Yusur Riyadh Abdulmajeed – College of Engineering, Al-Nahrain University – Member
4. Prof. Dr. Aliaa Khudhair Majeed – College of Engineering, University of Technology – Member
5. Prof. Dr. Saad Hanash Ammar – College of Engineering, Al-Nahrain University – Supervisor
The thesis was also scientifically reviewed by the first scientific reviewer, Prof. Dr. Ammar Saleh Abbas from the College of Engineering, University of Baghdad, and the second scientific reviewer, Asst. Prof. Dr. Zahraa Fadel Zahwar Mohammed from the College of Engineering, University of Technology. Additionally, it was linguistically reviewed by Lecturer Dr. Ahmed Farhan Muwaiz from the College of Engineering, Al-Nahrain University.
Herein, we synthesized AgI/ZIF-8/g-C3N4 ternary composites as a highly efficient heterojunction photocatalyst. Various techniques such as XRD, N2 adsorption-desorption isotherm, DRS, PL, TEM, and FE-SEM were examined to analyse several properties of the synthesised g-C3N4, ZIF-8, AgI, ZIF-8/g-C3N4, and AgI/ZIF-8/g-C3N4 photocatalysts. The photodecomposition of Rh.B dye was investigated under visible-light exposure over fabricated materials in a simple batch and split-plate airlift photocatalytic reactors. The findings showed that the photodegradation efficiency of the AgI/ZIF-8/g-C3N4 heterojunction was excellent, due to the synergistic effect between g-C3N4, AgI, and ZIF-8, simplifying the fast charge transfer. Notably, the degradation efficiency of AgI/ZIF-8/g-C3N4 heterojunction in the airlift photoreactor was higher and more rapid (98.8%) compared to the batch reactor (92%). The photocatalytic activity is significantly enhanced by the high self-mixing under air flow and dissolved O2, and thus further O2- radicle generation. Various factors affecting the efficiency of the efficiency of the AgI/ZIF-8/g-C3N4 photocatalyst were studied including the pH, Rh.B concentration, and the AgI/ZIF-8/g-C3N4 amount. The AgI/ZIF-8/g-C3N4 composite exhibited outstanding steadiness and recyclability even after five cycles, so it is probable to be very beneficial in treatment of contaminated water.
The thesis has been accepted as it meets the requirements for obtaining a doctoral degree.
