利用响应面法（RSM）优化淡水藻（集胞藻）对重金属的生物吸附。

Optimization of heavy metal biosorption onto freshwater algae (Chlorella coloniales) using response surface methodology (RSM).

机构信息

Department of Environmental Health, School of Health, Guilan University of Medical Sciences, Rasht, Iran.

Department of Environmental Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran; Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran.

出版信息

Chemosphere. 2019 Feb;217:447-455. doi: 10.1016/j.chemosphere.2018.10.205. Epub 2018 Nov 1.

DOI:10.1016/j.chemosphere.2018.10.205

PMID:30439657

Abstract

In this study, the interaction of the initial metal concentration, time of reaction and Chlorella coloniales algae dose were taken for the biosorption of Cr, Cd, Co, Fe and As from aqueous solutions using the Box-Behnken design. The regression equation coefficients were calculated and the data confirmed the validity of second-order polynomial equation for the removal of Cr, Cd, Co, Fe and As with Chlorella coloniales algae. Analysis of variance (ANOVA) showed a high coefficient of determination value (R) for Cr, Cd, Co, Fe, and As, being respectively 0.998, 0.998, 0.995, 0.998 and 0.994. Heavy metal biosorption increased with the increase in time of reaction from 30 h to 100 h then smoothly steadily decreased. The biosorption capacity of Chlorella coloniales increased when initial Cd concentration was increased from 5 to 12 mg/L, and then no change was seen with further increasing in initial Cd concentration. At low concentrations of heavy metal, Chlorella coloniales showed its effectiveness for Cr, Co, Fe and As bioaccumulation, but at high concentrations of heavy metal bioaccumulation efficiency decreased Under optimal value of process parameters, maximum efficiencies for the removal of Cr, Cd, Co, Fe, and As were 97.8, 97.05, 95.15, 98.6 and 96.5% respectively. The results of the present study suggest that use of C. Coloniales algae can be a good alternative to the current expensive methods of removing heavy metals from aqueous solution.

摘要

在这项研究中，采用 Box-Behnken 设计，研究了初始金属浓度、反应时间和小球藻剂量对从水溶液中生物吸附 Cr、Cd、Co、Fe 和 As 的相互作用。计算了回归方程系数，数据证实了用小球藻去除 Cr、Cd、Co、Fe 和 As 的二次多项式方程的有效性。方差分析（ANOVA）表明，Cr、Cd、Co、Fe 和 As 的决定系数（R）值较高，分别为 0.998、0.998、0.995、0.998 和 0.994。随着反应时间从 30 小时增加到 100 小时，重金属的生物吸附量增加，然后平稳稳定下降。当初始 Cd 浓度从 5mg/L 增加到 12mg/L 时，小球藻的生物吸附容量增加，然后随着初始 Cd 浓度的进一步增加，没有变化。在重金属浓度较低的情况下，小球藻对 Cr、Co、Fe 和 As 的生物积累表现出有效性，但在重金属浓度较高的情况下，生物积累效率降低。在最佳工艺参数值下，Cr、Cd、Co、Fe 和 As 的去除效率最高分别为 97.8%、97.05%、95.15%、98.6%和 96.5%。本研究结果表明，小球藻的使用可以替代目前从水溶液中去除重金属的昂贵方法。