期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 392, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.122208
关键词
Lignin composite hydrogel; Selective removal; Adsorption; Heavy metal ions; Hierarchical pore-forming agent
资金
- Science Fund for Distinguished Young Scholars of Heilongjiang Province of China [JC2017003]
- Fundamental Research Funds for the Central Universities [2572017CB14]
- Harbin Special Funds to Innovative Talents on Science and Technology Research Project [RC2016QN017026]
- National Innovation and Entrepreneurship Training Program for Undergraduate of Northeast Forestry University [201810225008]
In PAA-g-lignin, phase separation, caused by the difference in expansion properties between lignin and polyacrylic acid, is used to build a porous hydrogel. In this study, PAA-g-APL was produced by grafting polyacrylic acid with acid-pretreated alkali lignin. Acid-pretreated alkali lignin acts as a hierarchical pore-forming agent that enhances the simultaneous adsorption capacities for Pb2+, Cu2+ and Cd2+ ions from wastewater. Notably, PAA-g-APL acted as a selective adsorbent for Pb2+ ions has an excellent selective removal coefficient alpha (20.22) in contaminated wastewater contained Cu2+ ions. Its molar partition coefficient for Pb2+ ions (68 %) is higher than that for either Cu2+ ions (28.6 %) or Cd2+ ions (3.4 %). At equilibrium, the total adsorption capacities of PAA-g-APL for Pb2+, Cu(2+ )and Cd2+ were 1.076 mmol g(-1), 0.3233 mmol g(-1) and 0.059 mmol g(-1), respectively. The experimental kinetic data fitted well to a pseudo-second order model and to an intra-particle-diffusion model. The Freundlich isotherm model gave the best fit with the experimental equilibrium data. The Delta G degrees for PAA-g-APL is < 0, indicating that the adsorption of heavy metal ions is a spontaneous process. This study provides a highly promising candidate for the treatment of wastewater contaminated with a mixture of heavy metals.
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