Paper waste sludge derived-hydrochar modified by iron (III) chloride for effective removal of Cr(VI) from aqueous solution: Kinetic and isotherm studies
| Autor: | Thu Uyen Bui, Quang Trung Nguyen, Thu Huong Nguyen, Van Quang Nguyen, Thi Bich Lien Nguyen, Hung Le Sy, Huu Tap Van, Lan Huong Nguyen |
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| Rok vydání: | 2021 |
| Předmět: |
Aqueous solution
Precipitation (chemistry) Process Chemistry and Technology 02 engineering and technology 010501 environmental sciences Kinetic energy 01 natural sciences Ion Hydrothermal carbonization chemistry.chemical_compound Adsorption 020401 chemical engineering chemistry 0204 chemical engineering Fourier transform infrared spectroscopy Safety Risk Reliability and Quality Waste Management and Disposal Iron(III) chloride 0105 earth and related environmental sciences Biotechnology Nuclear chemistry |
| Zdroj: | Journal of Water Process Engineering. 39:101877 |
| ISSN: | 2214-7144 |
| DOI: | 10.1016/j.jwpe.2020.101877 |
| Popis: | This work investigated Cr(VI) adsorption onto pristine and iron modified hydrochar (PSH and PSH-Fe15, respectively) which were generated from paper waste sludge. The results indicate that the hydrothermal carbonization temperature of 200 °C was the most suitable for hydrochar production. The batch experiments and the adsorption isotherm and kinetic of Cr(VI) onto PSH and PSH-Fe15 were conducted and used to elucidate the adsorption mechanisms. The results demonstrate that the Cr(VI) adsorption capacity and efficiency onto both PSH and PSH-Fe15 reached equilibrium after 120 min at pH 3 and an initial Cr(VI) concentration of 60 mg/L. In this condition, the adsorption capacities were 5.94 mg/g and 8.67 mg/g and the removal efficiencies were 39.62 % and 57.80 % for PSH and PSH-Fe15, respectively. The adsorption processes were well described by the Sips and Redlich–Peterson isotherm models (with R2 of 0.9895, 0.9987 and 0.9947 and 0.9981 for PSH and PSH-Fe15, respectively) and pseudo-second-order kinetic model (with R2 of 0.98412 and 0.99681, respectively, for PSH and PSH-Fe15). The analysis of characteristics of PSH and PSH-Fe15 indicates the rough and heterogamous surface structures. Moreover, there was presence of iron ions on PSH-Fe15 based on EDS analysis and appearance of oxygen-containing surface functional groups recorded through FTIR results. Finally, it was observed that the reduction of Cr(VI) to Cr(III) caused by iron ions on PSM-Fe15’s surface and the presence of O H groups resulting in the precipitation of Cr(OH)3 on the hydrochar’s surface was the main mechanism of Cr(VI) adsorption onto PSH-Fe15. |
| Databáze: | OpenAIRE |
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