Akhtar N, Iqbal J, Iqbal M
Department of Biology, Government Islamia College for Women, Cooper Road, Lahore, Pakistan.
J Hazard Mater. 2004 Apr 30;108(1-2):85-94. doi: 10.1016/j.jhazmat.2004.01.002.
The biosorption process for the removal of nickel(II) by loofa sponge-immobilized biomass of Chlorella sorokiniana (LIBCS), a newly developed immobilized biosorbent, was characterized. Effects of environmental factors on metal uptake capacity of LIBCS were studied and compared with free biomass of C. sorokiniana (FBCS). Nickel(II) removal by LIBCS was found to be influenced by pH of the solution, initial metal concentration, and biomass concentration. The biosorption of nickel(II) ions by both LIBCS and FBCS increased as the initial concentration of nickel(II) ions increased in the medium. No loss to biosorption capacity of LIBCS for nickel(II) was found due to the presence of loofa sponge, indeed as compared to FBCS an increase of 25.3% was noted in the biosorption capacity of LIBCS. Maximum biosorption capacities for FBCS and LIBCS were found as 48.08 and 60.38 mg nickel(II)/g, respectively, whereas the amount of nickel(II) ions adsorbed on the plain loofa sponge was 6.1mg/g. During these biosorption studies, LIBCS exhibited excellent physical and chemical stability without any significant release/loss of microalgal biomass from loofa sponge matrix. The kinetics of nickel(II) removal was extremely fast reaching at equilibrium in about 15 min for LIBCS and 20 min for FBCS. The biosorption equilibrium was well described by the Langmuir and Freundlich adsorption isotherms. The biosorption capacities were found to be solution pH dependent and the maximum adsorption was found at a solution pH 4-5. The LIBCS could be regenerated using 75 mM HCl, with up to 98% recovery. The LIBCS were shown to be robust and stable with little decrease in the nickel(II) uptake capacity when used in consecutive seven biosorption-desorption cycles. Continuous removal of nickel(II) from electroplating effluent by LIBCS packed in fixed bed column bioreactor confirm the possibility of developing a biological treatment process for the removal of toxic metals from authentic wastewater.
对一种新开发的固定化生物吸附剂——丝瓜海绵固定的索氏小球藻生物质（LIBCS）去除镍（II）的生物吸附过程进行了表征。研究了环境因素对LIBCS金属吸收能力的影响，并与索氏小球藻的游离生物质（FBCS）进行了比较。发现LIBCS对镍（II）的去除受溶液pH值、初始金属浓度和生物质浓度的影响。随着培养基中镍（II）离子初始浓度的增加，LIBCS和FBCS对镍（II）离子的生物吸附均增加。未发现丝瓜海绵的存在导致LIBCS对镍（II）的生物吸附能力损失，实际上与FBCS相比，LIBCS的生物吸附能力提高了25.3%。FBCS和LIBCS的最大生物吸附容量分别为48.08和60.38 mg镍（II）/g，而普通丝瓜海绵上吸附的镍（II）离子量为6.1mg/g。在这些生物吸附研究中，LIBCS表现出优异的物理和化学稳定性，没有任何微藻生物质从丝瓜海绵基质中显著释放/损失。镍（II）去除的动力学非常快，LIBCS在约15分钟内达到平衡，FBCS在20分钟内达到平衡。Langmuir和Freundlich吸附等温线很好地描述了生物吸附平衡。发现生物吸附容量取决于溶液pH值，最大吸附发生在溶液pH值为4-5时。LIBCS可以用75 mM HCl再生，回收率高达98%。当用于连续七个生物吸附-解吸循环时，LIBCS表现出强大且稳定的性能，镍（II）吸收能力几乎没有下降。通过固定床柱生物反应器中填充的LIBCS连续去除电镀废水中的镍（II），证实了开发一种从实际废水中去除有毒金属的生物处理工艺的可能性。
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