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首页> 外文期刊>Journal of Polymers and the Environment >Adsorption of Zn(Ⅱ) and Pb(Ⅱ) Ions from Aqueous Solution Using Chitosan Cross-Linked Formaldehyde Adsorbent to Protect the Environment
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Adsorption of Zn(Ⅱ) and Pb(Ⅱ) Ions from Aqueous Solution Using Chitosan Cross-Linked Formaldehyde Adsorbent to Protect the Environment

机译：壳聚糖交联甲醛吸附剂对水溶液中Zn（Ⅱ）和Pb（Ⅱ）离子的吸附保护环境

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Synthesis of chitosan cross-linked formaldehyde was successfully prepared from shrimp chitosan. Characterization of the adsorbent using functional properties such as Fourier transform infrared spectroscopy and scanning electron microscope shows the present of amide and hydroxyl groups at their respective position, also the morphological structure of the adsorbent. Adsorption study of the above adsorbent was carry out for the removal of Zn(II) and Pb(II) from aqueous solution. The effect of cross-linked chitosan dosage, initial concentration, contact time, temperature and pH of the solution for the removal of Zn(II) and Pb(II) were discussed. The optimum dosage required for the removal of Zn(II) and Pb(II) were found to be at 0.4g at the maximum temperature of 25 degrees C and the percentage removal were 20.34 and 13.54% respectively. The time required for equilibrium to be reached was 50min. Effectiveness of the cross-linked adsorbent was observed to increase by increase in contact time. Further studies were also done on isotherms and kinetics of Zn(II) and Pb(II) removal from aqueous solution using chitosan cross-linked formaldehyde. Adsorption Isotherm study conducted from the cross-linked absorbent, shows that the Langmuir plot for the removal of Zn(II) was best fitted with R-2 value of 0.9934, and the adsorption process follows the pseudo second order kinetics with an R-2 value of 0.996. This adsorption process was established to be reversible with an R-L values of zinc (0.8232) and lead (0.8853) respectively. Therefore this implies a successfully reduction in the adsorption of zinc and lead ions from cross-linked formaldehyde solution to protect our environment.
机译：从虾壳聚糖中成功制备了壳聚糖交联甲醛。使用诸如傅里叶变换红外光谱和扫描电子显微镜的功能特性对吸附剂进行表征，表明酰胺和羟基分别存在于其各自的位置，并且也是吸附剂的形态结构。进行了上述吸附剂的吸附研究，以从水溶液中去除Zn（II）和Pb（II）。讨论了交联壳聚糖的用量，溶液的初始浓度，接触时间，温度和pH对去除Zn（II）和Pb（II）的影响。发现在最高温度25摄氏度下，去除Zn（II）和Pb（II）所需的最佳剂量为0.4g，去除百分率分别为20.34和13.54％。达到平衡所需的时间为50分钟。观察到交联吸附剂的有效性随着接触时间的增加而增加。还对使用壳聚糖交联甲醛从水溶液中去除Zn（II）和Pb（II）的等温线和动力学进行了进一步研究。从交联的吸收剂进行的吸附等温线研究表明，去除Zn（II）的Langmuir图最适合R-2值为0.9934，并且吸附过程遵循伪二级动力学，R-2值0.996。建立该吸附过程是可逆的，分别具有锌（0.8232）和铅（0.8853）的R-L值。因此，这意味着成功减少了交联甲醛溶液对锌和铅离子的吸附，从而保护了我们的环境。

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