一种新型木质素纳米球吸附剂的制备及其增强铅吸附性能的研究。
Preparation of a Novel Lignin Nanosphere Adsorbent for Enhancing Adsorption of Lead.
机构信息
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou 510640, China.
出版信息
Molecules. 2019 Jul 25;24(15):2704. doi: 10.3390/molecules24152704.
Carboxymethyl lignin nanospheres (CLNPs) were synthesized by a two-step method using microwave irradiation and antisolvent. The morphology and structure of CLNPs were characterized by P-NMR, FTIR, and SEM, and the results showed that they had an average diameter of 73.9 nm, a surface area of 8.63 m or 3.2 times larger than the original lignin, and abundant carboxyl functional groups of 1.8 mmol/g. The influence of dosage, pH, contact time, and concentration on the adsorption of metal ions onto CLNPs were analyzed, and the maximum adsorption capacity of CLNPs for Pb(II) was found to be 333.26 mg/g, which is significantly higher than other lignin-based adsorbents and conventional adsorbents. Adsorption kinetics and isotherms indicated that the adsorption of lead ions in water onto CLNPs followed the pseudo-second-order model based on monolayer chemisorption mechanism. The main chemical interaction between CLNPs and lead ions was chelation. CLNPs also showed an excellent recycling performance, with only 27.0% adsorption capacity loss after 10 consecutive adsorption-desorption cycles.
羧甲基木质素纳米球（CLNPs）采用两步法，通过微波辐射和反溶剂法合成。通过 P-NMR、FTIR 和 SEM 对 CLNPs 的形态和结构进行了表征，结果表明其平均直径为 73.9nm，比原始木质素的表面积大 3.2 倍，达到 8.63m2，且含有丰富的羧基官能团，为 1.8mmol/g。分析了剂量、pH 值、接触时间和浓度对 CLNPs 吸附金属离子的影响，发现 CLNPs 对 Pb(II)的最大吸附容量为 333.26mg/g，明显高于其他木质素基吸附剂和传统吸附剂。吸附动力学和等温线表明，水中铅离子在 CLNPs 上的吸附遵循基于单层化学吸附机制的准二级动力学模型。CLNPs 和铅离子之间的主要化学相互作用是螯合。CLNPs 还表现出优异的循环性能，经过 10 次连续吸附-解吸循环后，吸附容量仅损失 27.0%。
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