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| Study on the Specific Adsorption of Ni2+ for Nickel Bacteria in Nickel-containing Wastewater |
| ZHAO Yu-qing1,2, LI Jin2, ZHOU Guang-qi2, REN Zheng-yu2, YANG Hong-ze1, SUN Tian-zhu1, XING Yan-jie1 |
1. College of Life Science, Dalian Nationalities University, Dalian 116605, China;
2. School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, China |
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Abstract In order to solve the application of adsorption of heavy metal by microorganism, nickel-resistant strain was screened. The specific adsorption of nickel by the strain was investigated under the optimum conditions. Studies illustrated that the thermodynamic adsorption of Ni2+ by nickel-resistant strain could be described by Langmuir model. Under optimal conditions, the saturated adsorption capacity is up to 92.59mg/g as nickel-resistant strain absorbs Ni2+ to two hours. The adsorption kinetics of Ni2+ by nickel-resistant strain fitted the second-order kinetic model. Based on the curve of adsorption rate versus time, the following information canfitured out: When the concentration of Ni2+ is 25mg/L and the adsorption time is two hours, the adsorption tends to reach the balance and the rate of adsorption can reach up to 97.7%. The nickel-containing wastewater that exceeds the national standard of 50 times is close to the emission standard through primary treatment. The bacteria bears specific adsorption capability for nickel in wastewater. The thermodynamic model, IR spectra and AFM detection showed that the adsorption of Ni2+ by nickel-resistant strain mainly occurred on the surface of the thallus. The main adsorption sites were the h穜oxyl and amidogen groups from the protein and polysaccharide on the exocellular polymer of strain. It is conducive to recycle the bacteria during its application as engineering bacteria.
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Received: 20 February 2012
Published: 25 November 2012
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