Gorgan University Of Agricultural Sciences and Natural Resources Journal of Wood and Forest Science and Technology 2322-2077 24 3 2017 11 22 Removal of Lead ions from Aqueous Solutions Using Bacterial Cellulose Nano Fibers Gel Removal of Lead ions from Aqueous Solutions Using Bacterial Cellulose Nano Fibers Gel 197 208 3858 10.22069/jwfst.2017.11427.1604 FA Hassan Rezaei Gorgan University of Agricultural Sciences and Natural Resources Soheila Maghsoodlu a. M.Sc. student of Environmental Pollution, Faculty of Environment and Fisheries, Gorgan University of Agricultural Sciences and Natural Resources Journal Article 2016 07 24 Background and Objectives: Heavy metals such as Lead are toxic, stable and non-biological and causing numerous harmful effects on the environment and animals. Due to their mobility in natural water ecosystems and toxicity, the presence of heavy metals in surface water and ground water has become a major inorganic contamination problem. Discharge and treatment of industrial wastewater containing heavy metals are important issues in environmental protection. There are several methods to remove the heavy metals from aqueous solutions that adsorption is one of the best one. The aim of this study was to evaluate the efficiency of Bacterial Cellulose Nano Fibers Gel as adsorbent for the removal of Pb2 + ions from aqueous solutions. Material and Methods: Firstly, Bacterial Cellulose Nano Fibers Gel as a natural bio-nanomaterial was purchased with diameter in nanometer scale and length of a few microns. Secondly, the stock solution of Pb was prepared by dissolving Pb(NO3)2.6H2O in deionized water. The test solutions of various concentrations were prepared from the stock solution. The solution pH was adjusted using 0.1 M HNO3 and 0.1 M NaOH at the beginning of the experiment and not controlled afterwards. Batch experiments were conducted to study the effect of solution pH, temperature, contact time, absorbent amount and initial metal concentration and repeated on several occasions. Solution containing adsorbate and adsorbent was taken in 250 mL capacity conical flask and agitated at 120 rpm in a shaker at predetermined time intervals. Samples putted on the centrifuge with 4000 rpm for 5 minutes. Lead ions were determined spectrophotometrically by atomic absorption spectrophotometer. Finally, adsorption isotherm models and kinetic models were studied. Excel software were used for the analysis of data. Results: The results of this study showed that the highest uptake was observed in condition of pH=5, contact time 50 minutes and temperature 25℃. Metal uptake capacity of adsorbent was very high so adsorption was done on favorable conditions. The batch isotherm studies showed that the adsorption data could be described by Freundlich model and kinetic model of the sorption were pseudo second order equation. Conclusion: Based on the results, it can be concluded that, Bacterial Cellulose Nano Fibers Gel could be successfully used as an adsorbent for the removal of heavy metals from aqueous solutions, especially for the industrial wastewaters. This bio-nanopolymer has high specific surface area and also is easy to use, renewable, and environmental friendly material. Comparing with other similar studies, this material was found to be an excellent adsorbent and can be successfully used by industries for removal of heavy metals. Background and Objectives: Heavy metals such as Lead are toxic, stable and non-biological and causing numerous harmful effects on the environment and animals. Due to their mobility in natural water ecosystems and toxicity, the presence of heavy metals in surface water and ground water has become a major inorganic contamination problem. Discharge and treatment of industrial wastewater containing heavy metals are important issues in environmental protection. There are several methods to remove the heavy metals from aqueous solutions that adsorption is one of the best one. The aim of this study was to evaluate the efficiency of Bacterial Cellulose Nano Fibers Gel as adsorbent for the removal of Pb2 + ions from aqueous solutions. Material and Methods: Firstly, Bacterial Cellulose Nano Fibers Gel as a natural bio-nanomaterial was purchased with diameter in nanometer scale and length of a few microns. Secondly, the stock solution of Pb was prepared by dissolving Pb(NO3)2.6H2O in deionized water. The test solutions of various concentrations were prepared from the stock solution. The solution pH was adjusted using 0.1 M HNO3 and 0.1 M NaOH at the beginning of the experiment and not controlled afterwards. Batch experiments were conducted to study the effect of solution pH, temperature, contact time, absorbent amount and initial metal concentration and repeated on several occasions. Solution containing adsorbate and adsorbent was taken in 250 mL capacity conical flask and agitated at 120 rpm in a shaker at predetermined time intervals. Samples putted on the centrifuge with 4000 rpm for 5 minutes. Lead ions were determined spectrophotometrically by atomic absorption spectrophotometer. Finally, adsorption isotherm models and kinetic models were studied. Excel software were used for the analysis of data. Results: The results of this study showed that the highest uptake was observed in condition of pH=5, contact time 50 minutes and temperature 25℃. Metal uptake capacity of adsorbent was very high so adsorption was done on favorable conditions. The batch isotherm studies showed that the adsorption data could be described by Freundlich model and kinetic model of the sorption were pseudo second order equation. Conclusion: Based on the results, it can be concluded that, Bacterial Cellulose Nano Fibers Gel could be successfully used as an adsorbent for the removal of heavy metals from aqueous solutions, especially for the industrial wastewaters. This bio-nanopolymer has high specific surface area and also is easy to use, renewable, and environmental friendly material. Comparing with other similar studies, this material was found to be an excellent adsorbent and can be successfully used by industries for removal of heavy metals.

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