Effective sequestration of Congo red dye with ZnO/cotton stalks biochar nanocomposite: MODELING,reusability and stability |
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Authors: | Muhammad Mohsin Iqbal Muhammad Imran Tousif Hussain Muhammad Asif Naeem Abdullah A Al-Kahtani Ghulam Mustafa Shah Sajjad Ahmad Amjad Farooq Muhammad Rizwan Abdul Majeed Abdul Rehman Khan Shafaqat Ali |
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Institution: | 1. Department of Environmental Sciences, COMSATS University Islamabad, Vehari-Campus, 61100 Vehari, Pakistan;2. Center for Advanced Studies in Physics, Government College University, Lahore 54000, Pakistan;3. Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;4. Department of Environmental Sciences and Engineering Government College University, Faisalabad 38000, Pakistan;5. Sugarcane Research Institute, Ayub Agricultural Research Institute, Faisalabad, Pakistan;6. Department of Biotechnology, COMSATS University Islamabad, Abbottabad Campus, Pakistan;7. Department of Biological Sciences and Technology, China Medical University, Taichung 40402, Taiwan |
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Abstract: | Widespread application of dyes and disposal of their untreated effluents into water bodies adversely affect the ecosystem due to their complex aromatic structures and persistent nature. The present study aims to utilize the cotton stalks biochar (CSB) and its composite with zinc oxide nanoparticles (CSB/ZnONPs) to evaluate for the decontamination their batch scale potential of Congo red dye from wastewater. The characterization of CSB and CSB/ZnONPs was performed with Fourier-transform infra-red (FTIR) spectroscopy, scanning electron microscopy, energy-dispersive X-ray (EDX) and point of zero charge (PZC) to get insight of their potential for the decontamination of CR. The effects of initial CR concentration (25–500 mg/L), dosage of CSB and CSB/ZnONPs (0.5–2 g/L), solution pH (2–10) and contact time (0–180 min) were evaluated on CR removal at temperature (25 ± 1.5 °C). The results disclosed that CSB/ZnONPs showed excellent adsorption potential (556.6 mg/g) in comparison with CSB (250 mg/g) and most of the other adsorbents previously studies in the literature. The equilibrium experimental data were equally explained with Freundlich and Langmuir isotherm models (R2 > 0.98) while kinetic data demonstrated the best fit with pseudo second order model. The CSB/ZnONPs composite exhibited excellent reusability (89.65%) after five adsorption/desorption cycles for the sequestration of CR from contaminated systems. The present study demonstrated that metallic nanocomposite of CSB (CSB/ZnONPs) is an excellent candidate for the cost effective and environment friendly decontamination of CR from industrial wastewater and is suggested to be considered for the decontamination of other pollutants from the wastewater. |
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Keywords: | Congo red Decontamination Nanocomposite Adsorption Modeling Kinetics |
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