Synthesized Cr/TiO 2 immobilized on pumice powder for photochemical degradation of acid orange-7 dye under UV/visible li
- PDF / 1,888,468 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 48 Downloads / 163 Views
RESEARCH ARTICLE
Synthesized Cr/TiO2 immobilized on pumice powder for photochemical degradation of acid orange-7 dye under UV/visible light: influential operating factors, optimization, and modeling Meghdad Pirsaheb 1,2 & Hiwa Hossaini 1,2 & Nahid Azizi 3,4
&
Toba Khosravi 2
Received: 29 January 2020 / Accepted: 22 September 2020 # Springer Nature Switzerland AG 2020
Abstract The current study aimed to investigate the removal efficiency of acid orange-7 (AO7) using synthesized Cr/TiO2 immobilized on pumice powder under visible light and UV irradiation. The characterization of synthesized nanocatalyst examined by scanning electron microscope, X-ray diffraction, and Fourier transforms infrared. The optimum of experimental parameters including catalyst dosage, dye concentration, time and pH, D-optimal Design (DOD) along with response surface methodology obtained by R software. The initial and outlet concentration was measured using a spectrophotometer. Besides, Analysis of variance results for the quadratic model showed simple linear regression with high significance and provided as a predicting model. The differences less than 0.2 between multiple and adjusted R2 in two models indicate that two examined models fitted suitably. The highest removal efficiency of AO7 was 95 and 74% under visible and UV irradiation, respectively. Therefore, the higher removal efficiency in visible light reduces the costs and energy, moreover, offers an environmentally friendly method. The results showed that the removal efficiency of AO7 increased considerably with rising catalyst dosage and time, as well as minimizing dye concentration, and pH. Keywords Acid orange-7 . Cr/TiO2 . UV light . Visible light . Pumice
Introduction The effluent of the textile industries is one of the most significant types of water pollution worldwide due to the prominent demand for textile products. Besides, more than 17–20% of industrial water pollution produce in various processes of textile manufactures and produces colored wastewater [1, 2]. In these industries, azo dyes are significant and extensively used,
* Nahid Azizi [email protected] 1
Department of Environmental Health Engineering, Faculty of Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
2
Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
3
Students Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran
4
Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
which demonstrate relatively 70% of dyes consumption in the world [3, 4]. Beside, among azo dyes, methyl orange is widely used as a pH indicator (pKa = 3.5) as well as in textiles, food, paper, and leather industries. This compound creates serious health risks for humans and animals due to toxicity, cancer, genetic mutation, and low biodegradation [5]. Furthermore, methyl orange is stable to visible light and ultrav
Data Loading...
