Purpose:The present study provided a comprehensive description regarding the application of a mixture of three nonliving classes of algae as a promising and inexpensive biosorbent for removing toxic nickel (Ni(II)) ions from the aqueous medium. Methods:The biosorption process was tested by varying several experimental parameters such as pH (2-8), contaminant concentration (20-300 mg/L), biosorbent content (0.2-2 g/100 mL), and temperature (20-40 °C). In addition, the competition effects of the presence of Pb(II), Cu(II), and Zn(II) ions on the Ni(II) removal efficiency was studied by varying their concentrations from 30 to 40 mg/L. Results:The microscopic analysis of algae demonstrated that the used biosorbent consisted mainly of Chrysophyta (80%), Chlorophyte (14%), and Cyanophyta (6%). Results demonstrated that these environmental parameters influenced the removal efficiency with a different degree and there was no stable effects rank at conditions under examination. FT-IR and SEM analysis revealed that the biosorbent surface consists of many strong and active groups of negative valences such as hydroxyl and carboxyl groups, thus exhibiting several morphological properties of interest. Further, it was found that the Temkin model best fitted the isotherm biosorption data. The kinetic study showed that the Ni(II) biosorption was rapid within first 20 min of reaction time, thereby following a pseudo-second-order model, which in turn demonstrated a chemisorption process of Ni(II) ions reaction with the biosorbent binding sites. Also, the thermodynamic study suggested that the biosorption process of Ni(II) onto algal biomass was a spontaneous and endothermic in nature. The maximum uptake of Ni(II) was 9.848 mg/g under optimized conditions and neutral environment. Conclusions:Thus, this significant finding suggested a favorable and eco-friendly treatment mechanism for removal of Ni(II) ions from aqueous medium via biosorption onto the used mixture of nonliving algal biomass.

译文

目的:本研究提供了三种非生命藻类混合物作为有前途且廉价的生物吸附剂从水性介质中去除有毒镍(Ni(II))离子的应用的全面描述。
方法:通过改变多个实验参数来测试生物吸附过程,例如pH(2-8),污染物浓度(20-300 mg / L),生物吸附剂含量(0.2-2 g / 100mL)和温度(20-40) °C)。此外,通过将其浓度从30毫克/升改变为40毫克/升,研究了Pb(II),Cu(II)和Zn(II)离子的存在对Ni(II)去除效率的竞争影响。
结果:藻类的显微分析表明,所用生物吸附剂主要由金藻(80%),绿藻(14%)和蓝藻(6%)组成。结果表明,这些环境参数在不同程度上影响去除效率,并且在检查条件下没有稳定的影响等级。 FT-IR和SEM分析表明,生物吸附剂表面由许多具有负价的强而活跃的负价基团组成,例如羟基和羧基,因此表现出令人关注的几种形态学特性。此外,发现Temkin模型最适合等温线生物吸附数据。动力学研究表明,在反应时间的前20分钟内Ni(II)的生物吸附迅速,因此遵循伪二级模型,这反过来证明了Ni(II)离子与生物吸附剂结合位点反应的化学吸附过程。 。而且,热力学研究表明,Ni(II)在藻类生物质上的生物吸附过程本质上是自发的并且是吸热的。在优化条件和中性环境下,Ni(II)的最大吸收量为9.848 mg / g。
结论:因此,这一重要发现提出了一种有利且环保的处理机制,该机制可通过生物吸附到使用过的非藻类生物质混合物上而从水性介质中去除Ni(II)离子。

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