SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 60 ›› Issue (8): 275-292.DOI: 10.1016/j.cjche.2023.02.003

• Full Length Article • 上一篇    下一篇

Mechanisms and reusability potentials of zirconium-polyaziridine-engineered tiger nut residue towards anionic pollutants

Alexander Nti Kani, Evans Dovi, Aaron Albert Aryee, Runping Han, Zhaohui Li, Lingbo Qu   

  1. College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou 450001, China
  • 收稿日期:2022-10-02 修回日期:2023-01-19 出版日期:2023-08-28 发布日期:2023-10-28
  • 通讯作者: Runping Han,E-mail:rphan67@zzu.edu.cn

Mechanisms and reusability potentials of zirconium-polyaziridine-engineered tiger nut residue towards anionic pollutants

Alexander Nti Kani, Evans Dovi, Aaron Albert Aryee, Runping Han, Zhaohui Li, Lingbo Qu   

  1. College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou 450001, China
  • Received:2022-10-02 Revised:2023-01-19 Online:2023-08-28 Published:2023-10-28
  • Contact: Runping Han,E-mail:rphan67@zzu.edu.cn

摘要: Access to fresh water, its availability, and its quality are a global challenge to humanity, largely due to human activities in the environment. Thus, global water security has been jeopardized, requiring urgent remediation to safeguard our very existence. Hence, a novel and facilely engineered zirconium and polyethylenimine adsorbent based on tiger nut residue (TNR) was prepared, and its adsorptive capabilities towards a model dyestuff and nutrient were invested through a batch adsorption method. The developed adsorbent, zirconium-polyethylenimine-engineered tiger nut residue (TNR@PEI-Zr) was characterised by scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction analysis, and X-ray photoelectron spectroscopy to understand its morphology and surface chemistry and predict its adsorption mechanism. TNR@PEI-Zr had a pH point of zero charge (pHzpc) of 6.7. The introduction of salts inhibited the removal efficiency of Alizarin red (AR) and phosphate (PO43-) in the order of HCO3- > SO42- > Cl-. Increasing temperatures (293-313 K) favoured the adsorption process at pH 3. The Langmuir model suited the adsorption processes of both AR and PO43-, implying homogenous and monolayer removal of pollutants with a maximal capacity of 537.8 mg·g-1 and 100.5 mg·g-1 at a dose of 0.01 g, respectively. The rate-determining steps of AR and PO43- followed a pseudo-second-order kinetic model and were thermodynamically spontaneous with an increase in randomness at the solid-solution interface. The adsorbent’s recyclability was notable and outperformed most adsorbents in terms of removal efficiency. TNR@PEI-Zr was found to be stable, and its use in practical wastewater decontamination was effective, ecologically acceptable and free of secondary pollution problems.

关键词: Adsorption, Modified tiger nut residue, Alizarin red, Phosphate, Leaching, Regeneration

Abstract: Access to fresh water, its availability, and its quality are a global challenge to humanity, largely due to human activities in the environment. Thus, global water security has been jeopardized, requiring urgent remediation to safeguard our very existence. Hence, a novel and facilely engineered zirconium and polyethylenimine adsorbent based on tiger nut residue (TNR) was prepared, and its adsorptive capabilities towards a model dyestuff and nutrient were invested through a batch adsorption method. The developed adsorbent, zirconium-polyethylenimine-engineered tiger nut residue (TNR@PEI-Zr) was characterised by scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction analysis, and X-ray photoelectron spectroscopy to understand its morphology and surface chemistry and predict its adsorption mechanism. TNR@PEI-Zr had a pH point of zero charge (pHzpc) of 6.7. The introduction of salts inhibited the removal efficiency of Alizarin red (AR) and phosphate (PO43-) in the order of HCO3- > SO42- > Cl-. Increasing temperatures (293-313 K) favoured the adsorption process at pH 3. The Langmuir model suited the adsorption processes of both AR and PO43-, implying homogenous and monolayer removal of pollutants with a maximal capacity of 537.8 mg·g-1 and 100.5 mg·g-1 at a dose of 0.01 g, respectively. The rate-determining steps of AR and PO43- followed a pseudo-second-order kinetic model and were thermodynamically spontaneous with an increase in randomness at the solid-solution interface. The adsorbent’s recyclability was notable and outperformed most adsorbents in terms of removal efficiency. TNR@PEI-Zr was found to be stable, and its use in practical wastewater decontamination was effective, ecologically acceptable and free of secondary pollution problems.

Key words: Adsorption, Modified tiger nut residue, Alizarin red, Phosphate, Leaching, Regeneration