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- Title
Removal of Cd and Pb ions from model solutions using natural sorbent.
- Authors
Haratiyan, Fatemeh; Hakimzadeh, Vahid; Abedi, Mohammad Reza
- Abstract
Introduction. One of the limitations of chemical absorbents as a simple and effective method for removal the contamination due to surface absorption mechanism was their exorbitant costs. Therefore, the study of the potential of cheap and accessible natural adsorbents in the removal of heavy metals from industrial waste can be interesting. Materials and Methods. For the study of absorbent quantity, pH and temperature effectiveness on absorption capacity of cherry core, first the artificial solution was supplied in 1000 mg/lit concentration and was mixed by certain amount of absorbent at certain temperature and pH for 60 minutes. The solutions filtered by filter paper and the contents of each ion in initial and filtered solution were determinate by atomic absorption spectrometry. Effect of absorbent quantity (0.2–2 g/100 ml), pH (3–7) and temperature (30–70 °C) on absorption rate of Lead and Cadmium investigated in Response Surface Methodology (RSM). Results and Discussion. Increasing temperature improved the absorption rate of cadmium due to decrease of viscosity and accelerate mass transfer. Increasing of temperature limits the formation of boundary layer around the absorbent due to reduce of solution viscosity. So, ion absorption is intensified. Also, Increasing of absorbent quantity raises the surface contact and as results the chance of collision ions is improved with absorbent particles. In the other words, high quantity of absorbent increases the required cites to attach ions. Cadmium elimination at high value of pH was decreased due to conversion of ionic structure to molecular structure. Cadmium absorption rate was also increased by enlarging of absorbent; because of exist the more cites for absorption. Increasing the pH to 5 led to increase the Lead ions absorption, but rise of pH to 7 reduced absorption of Lead. The reason of this pneumonia is due to change of Lead ion structure to molecular state in alkaline pH. While in lower pH, competition hydrogen ions with cations decrease the absorption of metal ions. Conclusion. The best experimental parameters for maximum absorption ions were determined at the following conditions: temperature 70 °C, pH 5 and concentration of absorbent 2 g/100ml. By applying these conditions, Lead and Cadmium ions were decreased 79.18 and 76.56% respectively from artificial solutions. Also, optimal conditions were tested on sugar industry wastewater, which results indicated the rate of absorption for Lead and Cadmium was obtained 98.98 and 76.1% respectively.
- Subjects
CADMIUM; CHEMICAL absorbers; HEAVY metals removal (Sewage purification)
- Publication
Ukrainian Food Journal, 2017, Vol 6, Issue 2, p337
- ISSN
2304-974X
- Publication type
Article
- DOI
10.24263/2304-974X-2017-6-2-13