Scholarlink

<p>Heavy metal wastewater contamination has become one of the greatest global environmental problems. In this study, magnetic Laponite/poly(AA-AM) composite hydrogels (mLap/P(AM–AA)) with multi-level three-dimensional networks were synthesized by radical copolymerization based on poly(acrylamide-co-acrylic acid), Laponite and PEI magnetic nanoparticles. mLap/(AA–AM) with porous and uneven structure has the target structure and composition confirmed by FTIR, FESEM, EDX and XRD results. FTIR and XRD results show that mLap/P(AM–AA) has been successfully prepared without destroying high crystallinity of magnetic Fe<sub>3</sub>O<sub>4</sub>, and Laponite is dispersed in the polymer matrix with amorphous structure. mLap/P(AM–AA) have high adsorption capacities of Cu(II) (238&#xa0;mg/g), Cd(II) (259&#xa0;mg/g) and Pb(II) (466&#xa0;mg/g) in the condition of initial heavy metal ions of 1000&#xa0;mg/L and absorbent dose of 0.1&#xa0;g. The endothermic, entropy increasing and spontaneous nature of heavy metal ion adsorption is revealed from thermodynamic study. Heavy metal ions adsorption isotherms and kinetics are in agreement with the Langmuir model and pseudo-second-order kinetic model, respectively. Laponite within mLap/P(AM–AA) can increase thermal stability, storage modulus and loss modulus as well as adsorption capacities of heavy metals of mLap/P(AM–AA). In addition, mLap/P(AM–AA) has good magnetic response and magnetic solid–liquid separation, which can solve the shortcomings of traditional hydrogels such as insufficient gel strength and heat resistance as well as complicated recovery process, endowing its huge potential application in removing heavy metal ions from the contaminated wastewater.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Magnetic Laponite/P(AM–AA) composite hydrogels with high gel strength and thermal stability for efficient removal of heavy metals

  • 期刊论文

  • 发表日期：

    2025年5月16日

查看全文
  • Zhenggen Huang,
  • Tao Wan,
  • Yongmei Chen,
  • Dongmei Li,
  • Hao Xu,
  • Bingjun Liu,
  • Yang Zhao

摘要

Heavy metal wastewater contamination has become one of the greatest global environmental problems. In this study, magnetic Laponite/poly(AA-AM) composite hydrogels (mLap/P(AM–AA)) with multi-level three-dimensional networks were synthesized by radical copolymerization based on poly(acrylamide-co-acrylic acid), Laponite and PEI magnetic nanoparticles. mLap/(AA–AM) with porous and uneven structure has the target structure and composition confirmed by FTIR, FESEM, EDX and XRD results. FTIR and XRD results show that mLap/P(AM–AA) has been successfully prepared without destroying high crystallinity of magnetic Fe3O4, and Laponite is dispersed in the polymer matrix with amorphous structure. mLap/P(AM–AA) have high adsorption capacities of Cu(II) (238 mg/g), Cd(II) (259 mg/g) and Pb(II) (466 mg/g) in the condition of initial heavy metal ions of 1000 mg/L and absorbent dose of 0.1 g. The endothermic, entropy increasing and spontaneous nature of heavy metal ion adsorption is revealed from thermodynamic study. Heavy metal ions adsorption isotherms and kinetics are in agreement with the Langmuir model and pseudo-second-order kinetic model, respectively. Laponite within mLap/P(AM–AA) can increase thermal stability, storage modulus and loss modulus as well as adsorption capacities of heavy metals of mLap/P(AM–AA). In addition, mLap/P(AM–AA) has good magnetic response and magnetic solid–liquid separation, which can solve the shortcomings of traditional hydrogels such as insufficient gel strength and heat resistance as well as complicated recovery process, endowing its huge potential application in removing heavy metal ions from the contaminated wastewater.