We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Green mediated biosorption of Pb(II) from aqueous solution using chemically modified low-cost Grewia optiva leaves.
- Authors
Salman, Syed Muhammad; Wahab, Muhammad; Zahoor, Muhammad; Shahwar, Durre; Sultana, Sabiha; Alamzeb, Muhammad; Ahmed, Shabir
- Abstract
In this study, the green mediated biosorption of Pb(II) onto chemically modified Grewia optiva leaves (CMGOL) has been investigated. To improve the biosorption capacity, Grewia optiva leaves powder were treated with HNO3, then neutralized and finally activated with CaCl2. The prepared adsorbent was characterized by analytical tools such as Fourier-transform infrared spectroscopy, scanning electron microscopy, and Brunauer–Emmett–Teller surface area analyzer. To determine the optimum parameters of the biosorption process, batch experiments were performed under different conditions of pH (2–7), contact time (5–180 min), biosorbent dosage (0.1–30 g/L), initial metal concentration (10–800 mg/L), and temperature (25°C–50°C). Optimal biosorption of Pb was achieved at pH 6, biosorbent dosage 5 g/L, contact time 120 min, initial Pb concentration 100 mg/L, and temperature of 50°C. Correlation coefficient R2 value (0.967) of Langmuir adsorption model (monolayer adsorption capacity = 135.136 mg/g) was high as compared to the Freundlich adsorption model and thus fitted well the equilibrium adsorption data. Kinetic studies revealed that Pb biosorption data fitted well to the pseudo-second-order equation rather than the pseudo-first- order equation. The values of thermodynamic parameters ∆H° and ∆G° were negative while that of ∆S° was positive indicating favorable and spontaneous nature of the biosorption process. Due to high biosorption capacity (135.136 mg/g) the prepared CMGOL could be used effectively for the removal of Pb from wastewaters.
- Subjects
LANGMUIR isotherms; AQUEOUS solutions; SORPTION; ADSORPTION capacity; SCANNING electron microscopy; SORBENTS; INFRARED spectroscopy
- Publication
Desalination & Water Treatment, 2020, Vol 195, p413
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2020.25904