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Engineering    2017, Vol. 3 Issue (3) : 409-415     https://doi.org/10.1016/J.ENG.2017.03.024
Research |
香蕉假茎作为吸附剂用于水溶液中铅离子去除的条件优化、动力学与吸附平衡研究
Shridhar S. Bagali1(),Bychapur S. Gowrishankar2,Aashis S. Roy3()
1. Department of Chemical Engineering, Siddaganga Institute of Technology, Tumkur, Karnataka 572 103, India
2. Department of Biotechnology, Siddaganga Institute of Technology, Tumkur, Karnataka 572 103, India
3. Department of Industrial Chemistry, Addis Ababa Science and Technology University, Addis Ababa 16417, Ethiopia
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摘要 

香蕉假茎粉末等天然吸附剂对于去除废水中的重金属元素具有非常重要的作用。现有的去除重金属元素的常规方法难以满足水资源循环和化学工业的需求。本文论证了利用天然物质处理废水的可能性。利用环境扫描电子显微镜(ESEM) 和傅里叶变换红外(FTIR) 光谱学分析方法,研究了香蕉假茎粉末吸附铅离子前后的变化。实验采用批处理方法研究了水溶液中铅离子去除的效果。通过改变初始pH 值、吸附剂用量、初始铅离子浓度、吸附时间等参数,研究了吸附动力学的影响。结果表明,在水溶液pH 值为5.5 时,香蕉假茎粉末达到零电荷点。采用吸附等温线和动力学模型分析实验数据,采用朗缪尔吸附等温式拟合铅离子在香蕉假茎粉末表面的吸附作用。实验表明,香蕉假茎粉末对铅离子的吸附量为34.21mg·g−1,与拟二级动力学模型相匹配。此外,采用响应面分析法确定了铅离子吸附的最佳条件,铅离子的去除率高达89%。

关键词 香蕉假茎等温线吸附响应面分析法    
Abstract

Natural adsorbents such as banana pseudostem can play a vital role in the removal of heavy metal elements from wastewater. Major water resources and chemical industries have been encountering difficulties in removing heavy metal elements using available conventional methods. This work demonstrates the potential to treat various effluents utilizing natural materials. A characterization of banana pseudostem powder was performed using environmental scanning electron microscopy (ESEM) and Fourier-transform infrared (FTIR) spectroscopy before and after the adsorption of lead(II). Experiments were carried out using a batch process for the removal of lead(II) from an aqueous solution. The effects of the adsorption kinetics were studied by altering various parameters such as initial pH, adsorbent dosage, initial lead ion concentration, and contact time. The results show that the point of zero charge (PZC) for the banana pseudostem powder was achieved at a pH of 5.5. The experimental data were analyzed using isotherm and kinetic models. The adsorption of lead(II) onto banana pseudostem powder was fitted using the Langmuir adsorption isotherm. The adsorption capacity was found to be 34.21 mg·g−1, and the pseudo second-order kinetic model showed the best fit. The optimum conditions were found using response surface methodology. The maximum removal was found to be 89%.

Keywords Banana pseudostem      Lead      Isotherm      Adsorption      Response surface methodology     
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通讯作者: Shridhar S. Bagali,Aashis S. Roy     E-mail: shridhar.bagali@gmail.com;aashisroy@gmail.com
最新录用日期:    发布日期: 2017-06-30
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Shridhar S. Bagali
Bychapur S. Gowrishankar
Aashis S. Roy
引用本文:   
Shridhar S. Bagali,Bychapur S. Gowrishankar,Aashis S. Roy. Optimization, Kinetics, and Equilibrium Studies on the Removal of Lead(II) from an Aqueous Solution Using Banana Pseudostem as an Adsorbent[J]. Engineering, 2017, 3(3): 409-415.
网址:  
http://engineering.org.cn/EN/10.1016/J.ENG.2017.03.024     OR     http://engineering.org.cn/EN/Y2017/V3/I3/409
Variable Parameter Level
α −1 0 +1 +α
x1 Initial pH 1.29552 3 5.5 8 9.70448
x2 Initial lead ion concentration (mg·L−1) 12.9552 30 55 80 97.0448
x3 Adsorbent dosage (g·L−1) 0.318207 1 2 3 3.68179
Tab.1  Experimental range and levels of initial pH, initial lead ion concentration, and adsorbent dosage in CCD.
No. Initial pH Initial lead ion concentration (mg·L−1) Adsorbent dosage (g·L−1) Lead nitrate removal efficiency (%)
Experimental Predicted
1 3.0 30.00 1.00 63 66
2 8.0 30.00 1.00 71 67
3 3.0 80.00 1.00 80 75
4 8.0 80.00 1.00 58 63
5 3.0 30.00 3.00 79 72
6 8.0 30.00 3.00 72 75
7 3.0 80.00 3.00 72 74
8 8.0 80.00 3.00 70 65
9 1.3 55.00 2.00 71 73
10 9.7 55.00 2.00 67 65
11 5.5 12.96 2.00 72 72
12 5.5 97.04 2.00 71 71
13 5.5 55.00 0.32 71 69
14 5.5 55.00 3.68 74 76
15 5.5 55.00 2.00 90 88
16 5.5 55.00 2.00 89 88
17 5.5 55.00 2.00 89 88
18 5.5 55.00 2.00 87 88
19 5.5 55.00 2.00 89 88
20 5.5 55.00 2.00 89 88
Tab.2  Set of 20 experiments with combinations of three parameters.
Fig.1  ESEM photographs of banana pseudostem powder (a) before and (b) after adsorption of lead(II).
Fig.2  FTIR spectra of banana pseudostem powder (a) before and (b) after adsorption of lead(II).
Fig.3  Effect of initial pH on adsorption.
Fig.4  Effect of adsorbent dosage on adsorption.
Fig.5  Effect of initial lead ion concentration and contact time on adsorption.
Fig.6  Langmuir adsorption isotherm of lead ion in aqueous solution.
Fig.7  Freundlich adsorption isotherm of lead ion in aqueous solution.
Fig.8  Pseudo first-order kinetic model for lead ion adsorption.
Fig.9  Pseudo second-order kinetic model for lead ion adsorption.
Model Initial lead ion concentrations (ppm)
10 20 30 40 50
Pseudo first-order
K1 (min−1) 0.039 0.028 0.025 0.022 0.017
qe (mg·g−1) 6.05 11.81 15.03 18.00 19.78
R2 0.8981 0.9751 0.9772 0.8931 0.8336
Pseudo second-order
K2 ((g·mg−1)·min−1) 0.0090 0.0030 0.0020 0.0013 0.0011
qe (mg·g−1) 9.5 18.0 25.0 30.0 33.0
R2 0.9969 0.9962 0.9938 0.9729 0.9571
Tab.3  Parameters of the kinetic models.
Source Sum of squares Degree of freedom Mean square F P
Model 1599.92 9 177.77 9.92 0.0007
Residual 179.28 10 17.93
Total 1779.20 19
Tab.4  Analysis-of-variance results.
Fig.10  Surface plots for the effect of different parameters on lead nitrate removal efficiency. (a) Initial lead ion concentration and initial pH; (b) adsorbent dosage and initial pH; (c) adsorbent dosage and initial lead ion concentration.
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