Cadmium removal from aqueous solutions via biosorption onto acclimatized activated sludge

In this study, black carbon from pine cone (BCPC) and acidic-modified BCPC (MBCPC) powder as a popular agricultural waste in the southeast of Iran were used for cadmium removal from aqueous solutions. The effect of various factors, such as surface chemistry and dosage of adsorbent, contact time, size of particles, initial concentration of cadmium, temperature, and pH of aqueous solutions, was investigated. The results show cadmium removal with usage of the mentioned adsorbents increased after acidic modification. It was noteworthy in this work that the removal percentage of pollutant was above 90% for suggested biosorbents. The obtained experimental data for optimum conditions were selected to model the adsorption behavior of the materials with usage of six isotherm equations via non-linear fitting method and the residual root mean square error estimation for each model. The adsorption of cadmium preferably fitted Khan and Langmuir–Freundlich isotherms for BCPC and MBCPC adsorbents, respectively. The kinetic studies via linear fitting method proved the second-order kinetic was the applicable model for the adsorption process. Thermodynamic studies show the adsorption process of cadmium onto BCPC and MBCPC was spontaneous and endothermic.

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Biosorption of Heavy Metal Ions (Cu2+, Mn2+, Zn2+, and Fe3+) from Aqueous Solutions Using Activated Sludge: Comparison of Aerobic Activated Sludge with Anaerobic Activated Sludge

Applied Biochemistry and Biotechnology ◽

10.1007/s12010-012-9919-x ◽

2012 ◽

Vol 168 (8) ◽

pp. 2079-2093 ◽

Cited By ~ 15

Author(s):

Yunhai Wu ◽

Jianxin Zhou ◽

Yajun Wen ◽

Li Jiang ◽

Yunying Wu

Keyword(s):

Heavy Metal ◽

Aqueous Solutions ◽

Activated Sludge ◽

Metal Ions ◽

Heavy Metal Ions

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Cadmium removal from dilute aqueous solutions under galvanostatic mode in a flow-through cell

Desalination and Water Treatment ◽

10.1080/19443994.2015.1126411 ◽

2015 ◽

Vol 57 (48-49) ◽

pp. 22809-22817 ◽

Cited By ~ 1

Author(s):

Ma. de Lourdes Llovera-Hernández ◽

Alberto Álvarez-Gallegos ◽

J.A. Hernández ◽

Susana Silva-Martínez

Keyword(s):

Aqueous Solutions ◽

Cadmium Removal ◽

Galvanostatic Mode ◽

Dilute Aqueous Solutions ◽

Flow Through

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Utilization of agricultural and industrial wastes for metal removal from aqueous solutions

Polish Journal of Chemical Technology ◽

10.2478/v10026-011-0004-y ◽

2011 ◽

Vol 13 (1) ◽

pp. 20-22 ◽

Cited By ~ 3

Author(s):

Marta Biegańska ◽

Ryszard Cierpiszewski

Keyword(s):

Aqueous Solutions ◽

Adsorption Kinetics ◽

Metal Removal ◽

Order Equation ◽

Industrial Wastes ◽

Cadmium Removal ◽

Cadmium Ions ◽

Ph Values ◽

Freundlich Equation ◽

Pseudo Second Order

Utilization of agricultural and industrial wastes for metal removal from aqueous solutions In this study a possibility of obtaining sorbents from basketry wastes has been investigated. Therefore, adsorption of cadmium ions on wicker bark of Salix americana has been studied. The obtained experimental results were described by the Freundlich equation and adsorption kinetics by the pseudo-second order equation. The effect of pH on cadmium ions adsorption by S. americana was also investigated. It has been found that for the pH values ranging from 2 to 7 cadmium removal from the solution was held at almost constant level.

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