Adsorption isotherm of lead heavy metal from aqueous environment by bioadsorbents

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MOHAMMADPOUR M.; Afrous A.; BABAZADEH GH.; PAZIRA E.

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Journal: IRANIAN WATER RESEARCH JOURNAL Year:2020 | Volume:13 | Issue:4 (35) Page(s): 149-157

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Title

Adsorption isotherm of lead heavy metal from aqueous environment by bioadsorbents

Author(s)

MOHAMMADPOUR M. | Afrous A. | BABAZADEH GH. | PAZIRA E. | Issue Writer Certificate

Keywords

Activated carbonQ1

Contact timeQ2

Industrial wastewater purificationQ2

Rice huskQ2

Abstract

Heavy metals are hazardous pollutants that are usually produced by industrial wastewater and enter the aqueous environment. Their consumption by humans can cause health problems and even poisoning. The different kind of heavy metals such as lead is known as an important component in industrial wastewater. Environment pollution by heavy metals has affected human health and living organisms by a serious problem. Destructive effects of heavy metal can cause severe physiological or neurological damage to the human body. Therefore, heavy metals should be prevented to reach the natural environment. Today, the adsorption of heavy metals by natural adsorbents has been considered due to economic efficiency. Agriculture wastes or by-products have been investigated extensively for the removal of heavy metals due to their abundance in the nature. In recent years, natural materials have been used as adsorbent with low cost such as Rice husk, mud, agricultural wastes, silica, ash, and solid wastes. Recently, attention has been focused on the utilization of unmodified or modified Rice husk as a sorbent for the removal of pollutants. So far, few studies have been conducted on the simultaneous use of Rice husk and active carbon to remove lead ions. Therefore, in this study, the adsorption behavior of Rice husk, as a natural adsorbent, and Activated carbon to remove lead ions was considered with the following objectives: 1-Evaluation of the absorption capacity of lead metal in aqueous solution by two adsorbent (Rice husk and Activated carbon). 2-Evaluation of Langmuir and Freundlich adsorption isotherm models, as one of the important factors in the design of adsorption systems to determining the adsorbent capacity and optimizing. This study is performed in three different doses of adsorbent the Rice husk, and its silica (0. 5, 0. 75, and 1 gr/lit), initial concentrations of Pb metal (10, 15, 20, 25, 30, 35, 40, 45 and 50 mg/lit) on the uptake level, three different pH (4, 6, and 8), and in four Contact times (15, 30, 60, and 120 min). Rice husk was obtained from rice mill. The Rice husk was washed several times with distilled water and ethanol to remove pollutions. Subsequently, it was dried in the oven at the temperature of 90° for 3 hours. The Rice husk was milled by a simple mill and separated by a mesh-size sifter 30 and 40, with the sizes between 425 and 600 μ m. The average diameter of particles reached about 510 µ m that were selected for testing. The Activated carbon of Rice husk silica was provided by heat a portion of the Rice husk at 400 ° C for 4h. Metal salt Pb(NO3)2 was used to prepare the salt soluble with various concentrations of 1000 ml/ml of Pb ion in the stock solution. The separate experiments were performed in three distinct phases and then the remaining concentrations measured. 250 ml of three weight levels were used from two separate adsorbents of Rice husk and Activated carbon. In all experiments, the combination of solution and adsorbent were shaken on a shaker with the speed of 180 rpm. The mixture was separated of aqueous solution and Rice husk from each other by the use of filter paper of Whatman No. 42. Then, that was analyzed by the Perkin Elmer atomic adsorption machine, model 2380, and with the flame method. The concentration was measured of metal in the effluent. The temperature considered for the test to be at 25± 1 ° C. All of the data have confirmed through both Langmuir and Freundlich isotherms. In this study, results showed that the removal efficiency of Pb2+ by Rice husk and Activated carbon from aqueous solutions are affected by pH, Contact time, Pb2+ initial concentration and the adsorbent dosage. Investigating the time of equilibrium at different concentrations showed that by decreasing the initial concentration of the solution, the equilibrium time for both adsorbents (Activated carbon and Rice husk) decreased and its value was 30 minutes. The adsorption efficiency at different concentrations showed that by decreasing the initial concentration of the solution, the adsorption efficiency increased for both adsorbents. Activated carbon showed a higher ability to remove lead from the aqueous environment. The optimum pH and adsorbent dosage for Pb2+ removal was 6 and 1 gr/lit, respectively. It seems that with the increase in adsorbent dose, the specific surface area increases and thus the adsorption occurs more easily. The increase in removal efficiency of Pb with carbon dose probably resulted from the increase of total surface area and activated functional groups on carbons. The adsorption parameters were determined using both Langmuir and Freundlich isotherms. The results obtained from experimental data had a good conformity with the Langmuir equation output, but was better fitted to the results of Freundlich equation.

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APA: Copy

MOHAMMADPOUR, M., Afrous, A., BABAZADEH, GH., & PAZIRA, E.. (2020). Adsorption isotherm of lead heavy metal from aqueous environment by bioadsorbents. IRANIAN WATER RESEARCH JOURNAL, 13(4 (35) ), 149-157. SID. https://sid.ir/paper/406460/en

Vancouver: Copy

MOHAMMADPOUR M., Afrous A., BABAZADEH GH., PAZIRA E.. Adsorption isotherm of lead heavy metal from aqueous environment by bioadsorbents. IRANIAN WATER RESEARCH JOURNAL[Internet]. 2020;13(4 (35) ):149-157. Available from: https://sid.ir/paper/406460/en

IEEE: Copy

M. MOHAMMADPOUR, A. Afrous, GH. BABAZADEH, and E. PAZIRA, “Adsorption isotherm of lead heavy metal from aqueous environment by bioadsorbents,” IRANIAN WATER RESEARCH JOURNAL, vol. 13, no. 4 (35) , pp. 149–157, 2020, [Online]. Available: https://sid.ir/paper/406460/en

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