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Alashti, M., Khoshravesh, M., Sadegh-Zadeh, F., Azamathulla, H. (2024). Investigation of Nitrate Adsorption Isotherms by Iron (III) and Zinc-coated Biochars Using Ultrasonic. , 38(5), 554-541. doi: 10.22067/jsw.2024.86650.1379
M.R. Alashti; M. Khoshravesh; F. Sadegh-Zadeh; H.M. Azamathulla. "Investigation of Nitrate Adsorption Isotherms by Iron (III) and Zinc-coated Biochars Using Ultrasonic". , 38, 5, 2024, 554-541. doi: 10.22067/jsw.2024.86650.1379
Alashti, M., Khoshravesh, M., Sadegh-Zadeh, F., Azamathulla, H. (2024). 'Investigation of Nitrate Adsorption Isotherms by Iron (III) and Zinc-coated Biochars Using Ultrasonic', , 38(5), pp. 554-541. doi: 10.22067/jsw.2024.86650.1379
Alashti, M., Khoshravesh, M., Sadegh-Zadeh, F., Azamathulla, H. Investigation of Nitrate Adsorption Isotherms by Iron (III) and Zinc-coated Biochars Using Ultrasonic. , 2024; 38(5): 554-541. doi: 10.22067/jsw.2024.86650.1379

Investigation of Nitrate Adsorption Isotherms by Iron (III) and Zinc-coated Biochars Using Ultrasonic

آب و خاک
Volume 38, Issue 5 - Serial Number 97, November and December 2024, Pages 554-541    PDF (793.89 K)
Document Type: Research Article
DOI: 10.22067/jsw.2024.86650.1379
Authors
M.R. Alashti1; M. Khoshravesh* 1; F. Sadegh-Zadeh2; H.M. Azamathulla3
1Water Engineering Department, Faculty of Agricultural Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
2Department of Soil Science, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
3Department of Civil and Environmental Engineering, Faculty of Engineering, The University of the West Indies, St. Augustine Campus, St Augustine, Trinidad and Tobago
Abstract
Introduction
The rapid growth and development of urban communities, coupled with the increased industrial and economic activities in recent years, have led to the production and release of various pollutants into the environment. These pollutants have adverse effects on human health, living organisms, and the overall environment. With limitations in water resources, insufficient rainfall, the looming risk of water crises in many countries, and the escalating pollution of surface and underground water, there is a pressing need for environmental solutions to mitigate these issues. It is important to acknowledge that wastewater often contains pollutants that may render it unsuitable for certain applications. The utilization of biochar derived from cost-effective materials and innovative technologies such as ultrasonics is one avenue that warrants exploration for enhancing water quality. In this approach, a nitrate solution is exposed to both an adsorbent and ultrasonic waves. This dual treatment induces changes in the physical and chemical properties of water, thereby offering potential improvements in water quality.
 
Materials and Methods
This study aimed to explore the impact of utilizing biochar derived from rice straw, which was coated with iron(III) and zinc cations, and subjected to ultrasonication, on the nitrate adsorption process from aqueous solutions. In order to produce biochar, cheap materials of rice straw were used. The chopped straw was placed in the electric furnace and heated for one hour to reach the desired temperature. Then it was kept at that temperature for 2 hours. After that, the obtained biochar was washed three times with distilled water at a ratio of 1:20 and dried in an oven at 70°C for 24 hours. In this study, two temperature levels, 350 °C and 650 °C, were used for biochar production. Based on the results from pre-tests, it was found that biochars produced at 650 °C exhibited higher nitrate removal efficiency. These biochars were then used for the continuation of the experiments. To optimize the adsorbent dose, pre-tests were conducted using doses of 0.1, 0.3, 0.5, 0.8, and 1 gram of the adsorbent with 40 ml of nitrate solution. The concentrations of nitrate solution tested were 20, 45, 80, 100, 150, and 200 mg L-1. The research involved conducting experiments to determine the optimal parameters for each treatment, with three repetitions conducted in the water quality laboratory of Sari agricultural sciences and Natural Resources University during the years 2021 and 2022. The treatments comprised biochar (B), biochar and ultrasonic (BU), biochar with iron(III) coating (BF), biochar with iron(III) coating and ultrasonic (BFU), biochar with zinc coating (BZ), and biochar with zinc coating and ultrasonic (BZU). In this investigation, Langmuir and Freundlich adsorption isotherms were examined.
 
Results and Discussion
The results indicated that the BF and BFU treatments exhibited a higher maximum adsorption capacity. The Freundlich isotherm demonstrated higher correlation coefficients for BF, BFU, BZ, and B, suggesting a superior fit of the Freundlich model in these treatments. The better fit of the Freundlich adsorption isotherm indicates the heterogeneity of biochar surface adsorption sites, which means that the adsorption process is not confined to a single constituent layer. Nitrate adsorption on biochar surface is probably influenced by electrostatic adsorption and ion exchange. Conversely, the BZU and BU treatments showed a better fit with the Langmuir model. In the analysis of the Freundlich isotherm, nf values revealed that BF, BFU, and BZ treatments exhibited a favorable adsorption state with a desirable curve shape. The B treatment displayed a normal adsorption state with a linear curve shape, while BU and BZU treatments showed a weak adsorption state with an unfavorable curve shape. The elevated values of adsorption capacity (KF) obtained for BF, BFU, and BZ, namely 1909.414, 1484.22, and 386.63 ((mg g-1)(L mg-1)1/n), respectively, underscore the high nitrate adsorption capacity of these treatments. Also, biochars coated with iron(III) and with iron solution concentration of 10000 mg L-1 had a very good performance in removing nitrate from aqueous solutions. The new ultrasonic technology was able to improve the performance of the tested adsorbents in a period of 5 minutes without the need to stir the mixture of biochar and nitrate solution in the obtained equilibrium times, which were between 60 and 120 minutes. Application of this technology can be effective and useful in increasing the economic benefits of using limited water resources and increasing the efficiency of water consumption.
 
Conclusion
The utilization of cost-effective biochars derived from rice straw, along with the application of ultrasonic technology, can substantially decrease nitrate levels in aqueous solutions. In the case of biochar with iron(III) coating, biochar with iron(III) coating combined with ultrasonic treatment, and biochar combined with ultrasonic treatment, there is a notable affinity for nitrate to be adsorbed onto the surface of the adsorbent.
 
Keywords
Adsorbent; Adsorption capacity; Freundlich; Linear isotherm
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