| Autor: |
Sadaiyan B; Department of Chemical Engineering, Saveetha Engineering College, Thandalam, India., Karunanithi R; Department of Chemical Engineering, Saveetha Engineering College, Thandalam, India., Karunanithi Y; Department of Physics, Sri Bharathi Women's Arts & Science College, Arni, India. |
| Jazyk: |
angličtina |
| Zdroj: |
Environmental technology [Environ Technol] 2024 Aug; Vol. 45 (20), pp. 4131-4145. Date of Electronic Publication: 2023 Aug 07. |
| DOI: |
10.1080/09593330.2023.2241619 |
| Abstrakt: |
The current study is to develop surface-modified peanut shell granules by incorporating activated carbon to enhance the removal efficiency of Orange G dye (OGD) through adsorption. Activated carbon was prepared from Arachis hypogaea shell (Peanut shell) using a chemical activation method. Ultrasonic Activated Peanut Shell Powder (UAPSP) was characterised using FT-IR and SEM analysis to identify functional groups and assess surface morphology. To determine the optimal conditions, a batch adsorption study was conducted. The results indicated a maximum removal efficiency of 99.5% and a maximum adsorption capacity of 298.36 mg/g under the following parameters: pH 5, temperature 303 K, interaction period of 60 min, a dosage of 0.5 g/L for an OGD concentration of 10 mg/L. The adsorption mechanism in the current system was evaluated using the Langmuir, Freundlich, Sips, Temkin, and D-R isotherms models. Among these, the Langmuir isotherm exhibited the best fit with an R 2 value of 0.997. UAPSP demonstrated a monolayer adsorption capacity of 1.9 mg/g for OGD removal. The pseudo-second-order kinetic model provided the most effective fit with an R 2 value of 0.998. Thermodynamic studies revealed that the adsorption process was spontaneous and exothermic, as evidenced by the negative values of ΔG° ( -1.497) and ΔS° (16.4052) at 303 K. Additionally, the mean free energy value ( E ) in the D-R isotherm increased to 10.58 KJ/mol with a temperature rise from 303 K to 343 K. The characterisation results confirmed that UAPSP is an effective, cost-free, and commercial alternative adsorbent for the removal of hazardous dyes from wastewater. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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