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Evaluation of Olive Stones for Cd(II), Cu(II), Pb(II) and Cr(VI) Biosorption from Aqueous Solution: Equilibrium and Kinetics
International Journal of Environmental Research ( IF 3.2 ) Pub Date : 2020-02-14 , DOI: 10.1007/s41742-020-00246-5
Marwa Ben Amar , Khaled Walha , Victoria Salvadó

Milled olive stones are evaluated as a biosorbent for the removal of heavy metals such as Cd (II), Cu (II), Pb(II) and Cr(VI) from aqueous effluents. To this end, thermodynamic and kinetic studies for single and multimetal systems are performed through batch equilibrium isotherms. The biosorbent was characterized by elemental and FTIR analysis and scanning electron microscopy. The effect of the different parameters, such as contact time, pH, amount of adsorbent and initial metal concentration, on the sorption process is also investigated. The maximum removal percentage for 1 mg L −1 of cadmium, copper, and lead was 77.4%, 80.5%, and 94.5%, respectively, at pH 6 with 5 g L −1 of sorbent. In the case of Cr(VI), a removal percentage of 46% was obtained in 2 h at pH 2 using a larger amount of sorbent (10 g L −1 ) and an initial concentration of 2 mg L −1 . Equilibrium data were analyzed by applying different adsorption isotherm models, resulting in—a good agreement with—the Langmuir model with maximum capacities of 0.557, 0.3 and 0.581 mg g −1 for Cu(II), Cd(II) and Pb(II), respectively, whereas for Cr(VI), the Temkin model provided the best fit with a maximum capacity of 2.34 mg g −1 . The kinetic data fitted well into the pseudo-second-order model which allowed the adsorption rate constants to be calculated. Cd(II) resulted to have the highest kinetic constant, followed by Cu(II), Cr(VI) and Pb(II). The results showed that milled olive stones can be used as a biosorbent for the removal of these metals from aqueous solutions. Trace concentrations of Cu(II), Cd(II), Pb(II), and Cr(VI) were adsorbed by olive stones. Removals of 77.4%, 80.5 and 94.5% were obtained for Cu(II), Cd(II), or Pb(II) at pH 6. For Cr(VI), a removal percentage of 46% was obtained at pH 2 with 10 g L −1 of sorbent. Langmuir isotherm model was fitted to Cu(II), Cd(II), and Pb(II) adsorption isotherm data. Cd(II) has the highest pseudo-second-order kinetic constant, followed by Cu(II), Cr(VI) and Pb(II). Milled olive stone is an effective and cheaper biosorbent to remove toxic metals.

中文翻译:

橄榄石对水溶液中 Cd(II)、Cu(II)、Pb(II) 和 Cr(VI) 的生物吸附评价:平衡和动力学

磨碎的橄榄核被评估为一种生物吸附剂,用于从废水中去除重金属,如 Cd (II)、Cu (II)、Pb(II) 和 Cr(VI)。为此,通过批次平衡等温线对单金属和多金属系统进行热力学和动力学研究。生物吸附剂通过元素和 FTIR 分析以及扫描电子显微镜进行表征。还研究了不同参数对吸附过程的影响,例如接触时间、pH、吸附剂的量和初始金属浓度。在 pH 6 和 5 g L -1 吸附剂下,1 mg L -1 镉、铜和铅的最大去除百分比分别为 77.4%、80.5% 和 94.5%。在 Cr(VI) 的情况下,使用更大量的吸附剂 (10 g L -1 ) 和 2 mg L -1 的初始浓度,在 pH 2 下 2 小时内获得了 46% 的去除百分比。通过应用不同的吸附等温线模型分析平衡数据,结果与 Langmuir 模型非常吻合,Cu(II)、Cd(II) 和 Pb(II) 的最大容量为 0.557、0.3 和 0.581 mg g -1 ,而对于 Cr(VI),Temkin 模型提供了最佳拟合,最大容量为 2.34 mg g -1 。动力学数据很好地拟合到允许吸附速率常数计算的准二级模型中。Cd(II) 的动力学常数最高,其次是 Cu(II)、Cr(VI) 和 Pb(II)。结果表明,磨碎的橄榄石可用作生物吸附剂,用于从水溶液中去除这些金属。橄榄核吸附了痕量浓度的 Cu(II)、Cd(II)、Pb(II) 和 Cr(VI)。在 pH 6 时,Cu(II)、Cd(II) 或 Pb(II) 的去除率分别为 77.4%、80.5 和 94.5%。对于 Cr(VI),在 pH 2 和 10 g L -1 的吸附剂。Langmuir 等温线模型拟合 Cu(II)、Cd(II) 和 Pb(II) 吸附等温线数据。Cd(II) 的准二级动力学常数最高,其次是 Cu(II)、Cr(VI) 和 Pb(II)。磨碎的橄榄石是一种有效且廉价的生物吸附剂,可去除有毒金属。和 Pb(II) 吸附等温线数据。Cd(II) 的准二级动力学常数最高,其次是 Cu(II)、Cr(VI) 和 Pb(II)。磨碎的橄榄石是一种有效且廉价的生物吸附剂,可去除有毒金属。和 Pb(II) 吸附等温线数据。Cd(II) 的准二级动力学常数最高,其次是 Cu(II)、Cr(VI) 和 Pb(II)。磨碎的橄榄石是一种有效且便宜的生物吸附剂,可去除有毒金属。
更新日期:2020-02-14
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