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Study on the modification of fly ash from domestic waste incineration and its adsorption performance on Pb2+

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Abstract

In order to achieve a high-value use of fly ash, modified fly ash adsorbent was prepared using domestic waste incineration fly ash as raw material and Ca(OH)2 as modifier under the action of ultrasonic waves. The adsorption performance of modified fly ash on Pb2+ in solution was investigated and characterized using XRD, SEM and FTIR for virgin fly ash, modified fly ash and adsorbed fly ash. The results show that the amount of adsorbent added, reaction time, pH and the initial concentration of Pb2+ all affect the adsorption effect of modified fly ash on Pb2+..The Langmuir model and the secondary kinetic model can better simulate the adsorption behavior of modified fly ash on Pb2+ with a Gibbs free energy ΔG of − 10.39 kJ mol−1, indicating that the adsorption process is a preferential adsorption process belonging to a single molecular layer and proceeding spontaneously, and the maximum adsorption capacity can be reached 386 mg g−1. The adsorption process of modified fly ash on Pb2+ is a chemisorption process dominated by the presence of surface complexation of –OH groups.

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Abbreviations

C 0 (mg L−1):

The initial concentration of Pb2+ in the solution

C e (mg L−1):

The equilibrium concentration of pb2+ in the solution

V (mL):

The volume of the solution

M (g):

The dose of adsorbent

q e (mg g−1):

The adsorption capacity at adsorption equilibrium

q max (mg g−1):

The maximum adsorption capacity

K L (L g−1):

The adsorption equilibrium constant

R (J (mol k) −1):

The ideal gas constant, 8.314

T (k):

The absolute temperature

n (−):

Related to the adsorption intensity

K f (mg g−1):

The adsorption equilibrium constant

q s (mg g−1):

The theoretical saturation adsorption capacity

β (mol2 kJ−2):

A constant

\(\varepsilon\) (kJ·mol−1):

The adsorption potential

E (kJ mol−1):

The average free energy

b T (mol J−1):

The Temkin constant

K T (L mg−1):

The equilibrium affinity constant

t (min):

The adsorption time

q t (mg g−1):

The adsorption capacity at time

K 1 (min−1):

The adsorption rate constant for primary kinetics

K 2 (g (mg min) −1):

The secondary adsorption rate constant

a (mg (g min)−1):

The initial adsorption rate constant

b (mg g−1):

The desorption rate constant

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant No. 51568068). The authors thank the Analysis and Testing Center of Yunnan University for Nationalities for providing instrumental support.

Funding

Characterization of zirconium oxide solid acid/base catalyzed hydrolysis of industrial waste gas containing low concentration of Freon (51568068).

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Authors and Affiliations

  1. The Scientific and Technological Innovation Team of Green Purification Technology of Industrial Waste Gas in Universities in Yunnan Province, Kunming, China

    W. Zhao, B. Wang, T. Zhang & T. Liu

  2. Environmental Functional Materials of Yunnan Province Education Department, Kunming, China

    W. Zhao, B. Wang, T. Zhang & T. Liu

  3. School of Chemistry and Environment, Yunnan Minzu University, Kunming, 650500, China

    W. Zhao, B. Wang, T. Zhang & T. Liu

Authors
  1. W. Zhao
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  2. B. Wang
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  3. T. Zhang
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  4. T. Liu
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Contributions

WZ contributed to the methodology, experimental part and original writing scheme. BW contributed to writing and editing. TZ contributed to the methodology and experimental part. T contributed to editing and visualization.

Corresponding author

Correspondence to B. Wang.

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Editorial responsibility: Ales Hanc.

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Zhao, W., Wang, B., Zhang, T. et al. Study on the modification of fly ash from domestic waste incineration and its adsorption performance on Pb2+. Int. J. Environ. Sci. Technol. 21, 1235–1244 (2024). https://doi.org/10.1007/s13762-023-05023-3

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  • DOI: https://doi.org/10.1007/s13762-023-05023-3

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