Design expert application for optimization of Ag/AgBr/TiO2 visible light photocatalyst preparation

Augustine Chioma Affam, Wong Chee Chung, Poh Lin Lau, Olufemi Adebayo Johnson, Khor Cheng Seong, Lavania Baloo, Bryan Wong Lee Peng, Fung Xınru

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Titanium dioxide (TiO2) was activated under visible light after modification by doping with silver/silver bromide (Ag/AgBr) through simple impregnation-precipitation-photoreduction process. The use of central composite design tool of design expert in order to optimize the preparation parameters namely silver dopant, precipitation time and photoreduction time for the degradation of pesticide chloropyrifos was feasible. From the analysis of variance (ANOVA), the most influential factors affecting the experimental process and interaction was identified. The chemical oxygen demand (COD) removal increased with increasing the amount of Ag dopant and photoreduction time while precipitation time was not a significant factor. Optimized condition for preparation of the Ag/AgBr/TiO2 was mass ratio of Ag to TiO2: 1:1, precipitation time: 60 min, and photoreduction time: 90 min. Experimental COD removal efficiency was 77% while the predicted value was 77.4%. The percentage error was 0.51%. The close agreement between both predicted and actual COD removal shows good model.

Original languageEnglish
Title of host publicationProceedings of the 6th International Conference on Civil, Offshore and Environmental Engineering
EditorsBashar S. Mohammed, Nasir Shafiq, Shamsul Rahman M. Kutty, Hisham Mohamad, Abdul-Lateef Balogun
Number of pages10
ISBN (Electronic)9789813363113
ISBN (Print)9789813363106
Publication statusPublished - 1 Jan 2021
Event6th International Conference on Civil, Offshore and Environmental Engineering 2020 - Kuching, Malaysia
Duration: 13 Jul 202115 Jul 2021

Publication series

NameLecture Notes in Civil Engineering
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565


Conference6th International Conference on Civil, Offshore and Environmental Engineering 2020
Abbreviated titleICCOEE 2020


  • CCD
  • Chlorpyrifos wastewater
  • COD
  • Modeling
  • Optimization
  • Phosphate
  • Visible light photocatalysis

ASJC Scopus subject areas

  • Civil and Structural Engineering


Dive into the research topics of 'Design expert application for optimization of Ag/AgBr/TiO<sub>2</sub> visible light photocatalyst preparation'. Together they form a unique fingerprint.

Cite this