Preparation of new chelating fiber with waste PET as adsorbent for fast removal of Cu2+ and Ni2+ from water: Kinetic and equilibrium adsorption studies
Preparation of new chelating fiber with waste PET as adsorbent for fast removal of Cu2+ and Ni2+ from water: Kinetic and equilibrium adsorption studies
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以废PET为吸附剂制备新型螯合纤维快速去除水中的Cu2和Ni2：动力学和平衡吸附研究
DOI：
10.1016/j.cej.2012.03.070
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发表时间：
2012-06
影响因子：
15.1
通讯作者：
Aimin Li
中科院分区：
文献类型：
--
作者：
Jinnan Wang;Li Xu;Cheng Cheng;Ying Meng;Aimin Li
以废PET为原料制备了一种新型螯合纤维（WJN-1），用于快速去除水中的Cu ~（2+）和Ni ~（2+）。采用元素分析、SEM、接触角、BET比表面积和13 CNMR等方法对WJN-1进行了表征。WJN-1对Cu ~（2+）和Ni ~（2+）的吸附能力在较高的pH值下表现出较高的吸附能力，在酸性介质中表现出较低的吸附能力。动力学研究表明，Cu 2+和Ni 2+的吸附符合准二级动力学方程，表明颗粒内扩散是吸附过程的限速步骤。在278- 308 K温度范围内，吸附焓变为6.69 ~ 16.05kJmol-1，自由能变为-2.03 ~-9.28kJmol-1。虽然溶液中Ca 2+的存在对Cu 2+和Ni 2+的去除影响可以忽略不计，但即使Ca 2+浓度高达75 mgL-1，WJN-1仍能保持90%以上的吸附容量。用1 M HCl或0.1M EDTA作为洗脱剂，WJN-1吸附的Cu ~（2+）和Ni ~（2+）可被有效解吸，且WJN-1对两种重金属离子的吸附容量在第5次循环时仍能保持在93%的水平。综上所述，WJN-1有望成为一种快速去除水中Cu 2+和Ni 2+的吸附剂，并为废旧PET纤维的回收利用提供了一种简单有效的方法。
A new chelating fiber (WJN-1) was prepared with waste PET for fast removal of Cu2+and Ni2+from water. Elemental analysis, SEM, contact angle, BET surface area and13CNMR were used to characterize WJN-1. The higher uptake capacity of Cu2+and Ni2+by WJN-1 was achieved at higher pH values, and the lower uptake capacity was observed in an acidic medium. Kinetic study indicated that the adsorption of Cu2+and Ni2+could be well fitted by the pseudo-second-order equation, suggesting intra-particle diffusion process as the rate-limiting step of the adsorption process. When the temperature was raised within the range of 278–308K, the adsorption enthalpy changes of WJN-1 were about from 6.69 to 16.05kJmol−1, and the free energy changes were about from −2.03 to −9.28kJmol−1. Although the presence of Ca2+in solution had negligible effect on the removal of Cu2+and Ni2+, WJN-1 could remain over 90% of its adsorption capacity even if the Ca2+concentration was up to 75mgL−1. 1M HCl or 0.1M EDTA could be used as effective eluant to desorb the Cu2+and Ni2+adsorbed by WJN-1, and the adsorption capacity of WJN-1 for two heavy metal ions could still be maintained at 93% level at the 5th cycle. Taken together, it was expected that WJN-1 could be used as a promising adsorbent for fast removal of Cu2+and Ni2+from water, and the present work also might provide a simple and effective method to reuse the waste PET fibers.
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影响因子：
1.8
作者：
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通讯作者：
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影响因子：
11.4
作者：
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影响因子：
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作者：
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作者：
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