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Pb (II) biosorption from the aqueous solutions by raw and modified tea factory waste (TFW)
International Journal of Environmental Science and Technology ( IF 3.1 ) Pub Date : 2021-01-02 , DOI: 10.1007/s13762-020-03038-8
Y. Nuhoğlu , Z. Ekmekyapar Kul , S. Kul , Ç. Nuhoğlu , F. Ekmekyapar Torun

The study is aimed to determine Pb (II) biosorption from synthetic wastewaters using natural and modified tea factory waste as biosorbent material. This process is carried out with this waste matter, which is found in large quantities, so cheap and has high metal adsorption ability. The sorption kinetic studies were determined as variations of initial pH value, particle size, initial Pb (II) and tea factory waste concentrations, stirring speed and temperature. Biosorption reached the equilibrium in 15 min. Zeta potential values of the biosorbent were defined in the range of pH 2 to 4. The adsorption isotherm models give the experimental values, and the thermodynamic characteristics of the patterns generally give insight about the sorption mechanism depending on the surface characteristics and affinity of the biosorbent. The biosorption mechanism was searched considering to Freundlich, Langmuir, BET and Temkin isotherm model, and the experimental adsorption values were conformed to Freundlich adsorption model. The optimum experimental conditions were investigated as pH 3.5, particle size of 0.125–0.25 mm, stirring speed of 200 rpm, biosorbent concentration of 7 g L−1 and 25 °C. In these conditions, the highest efficiency of biosorption was obtained as 94.07% and after the activating process the efficiency was reached to 97.73% at 70 mg L−1. The maximum Pb (II) removal capacity of raw tea factory waste was found to be 22.111 mg g−1 at 200 mg L−1. The biosorption kinetics has complied with the pseudo-second-order model. Thermodynamic studies stated that this biosorption phenomenon was an endothermic process.



中文翻译:

茶叶原厂和改性茶厂废水(TFW)对水溶液中Pb(II)的生物吸附

该研究旨在确定使用天然和改性茶厂废物作为生物吸附剂的合成废水中Pb(II)的生物吸附。该处理是利用这种废物进行的,该废物大量存在,非常便宜并且具有高的金属吸附能力。吸附动力学研究确定为初始pH值,粒径,初始Pb(II)和茶厂废物浓度,搅拌速度和温度的变化。15分钟内生物吸附达到平衡。生物吸附剂的Zeta电位值定义在pH 2到4的范围内。吸附等温线模型给出了实验值,图案的热力学特征通常根据表面特征和生物吸附剂的亲和力提供了有关吸附机理的见解。 。根据Freundlich,Langmuir,BET和Temkin等温模型寻找生物吸附机理,实验吸附值与Freundlich吸附模型相符。研究了最佳实验条件,pH为3.5,粒径为0.125–0.25 mm,搅拌速度为200 rpm,生物吸附剂浓度为7 g L-1和25°C。在这些条件下,最高的生物吸附效率为94.07%,并且在活化过程之后,在70 mg L -1时,效率达到97.73%。的生茶工厂废料的最大的Pb(II)除去能力被认为是22.111毫克克-1在200毫克的L -1。生物吸附动力学符合伪二级模型。热力学研究表明,这种生物吸附现象是一个吸热过程。

更新日期:2021-01-02
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