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Preparation of a novel non-burning polyaluminum chloride residue(PACR) compound filler and its phosphate removal mechanisms

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Abstract

As an inevitable industrial by-product, polyaluminum chloride residue (PACR) will cause serious harm to the environment if directly buried and dumped. The aim of this paper was searched a new economical, environmental, and practical way of utilization for PACR. In this paper, a novel non-burning PACR compound filler was made from mainly PACR. The prepared compound filler has excellent physical properties and phosphate adsorption efficiency of up to 99.9%. Static adsorption experiments showed that the adsorption process of phosphorus by the compound filler conformed to the pseudo-second-order kinetic model and intra-particle diffusion model. Langmuir and Freundlich isotherm models described the phosphorus adsorption process well, and the maximum phosphate adsorption capacity arrived at 42.55 mg/g. The phosphate adsorption by the compound filler is a spontaneous endothermic process. The main mechanisms are ligand exchange and Lewis acid-base interactions; calcium and aluminum play important roles in the adsorption of phosphorus by the compound filler. Dynamic column experiments showed that as much as 90% of the phosphorus removal by compound filler, and the phosphorus concentration decreased from 1 to ~0.1mg/L. The results provide a new waste resource utilization method for PACR and show the good application potential of prepared compound filler in constructed wetlands.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors would like to thank Professor Zhao Yaqian of Xi’an University of Technology/University of Dublin for his theoretical guidance.

Funding

This research was supported by the National Science and Technology Major Project (2017ZX07602-003-002) and by the Major Special Science and Technology Project of Henan Province (181100310300), and the fellowship of China Postdoctoral Science Foundation (2020TQ0284 and 2020M682355), and Henan Postdoctoral Foundation (202003027).

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Authors and Affiliations

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Contributions

Qiang Li: conceptualization, formal analysis, data curation, visualization, writing -original draft, writing - review & editing.

Jingshen Zhang: formal analysis, resources, supervision, methodology, validation.

Jingqing Gao: conceptualization, supervision, resources, funding acquisition, project administration, writing - review & editing, validation.

Zhenzhen Huang: investigation, writing - review & editing, project administration, supervision, validation.

Haoxin Zhou: investigation, methodology.

Haoyu Duan: investigation, software.

Zihao Zhang: Resources.

Corresponding authors

Correspondence to Jingqing Gao or Zhenzhen Huang.

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The authors declare no competing interests.

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Li, ., Zhang, ., Gao, J. et al. Preparation of a novel non-burning polyaluminum chloride residue(PACR) compound filler and its phosphate removal mechanisms. Environ Sci Pollut Res 29, 1532–1545 (2022). https://doi.org/10.1007/s11356-021-15724-2

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  • DOI: https://doi.org/10.1007/s11356-021-15724-2

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