Research on the recycling of waste activated sludge as an adsorbent material for ammonium removal in wastewater

Thai Thanh Hoang Thi, Truc Linh Do Thi, Dai Hai Nguyen
Author affiliations

Authors

  • Thai Thanh Hoang Thi Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam https://orcid.org/0000-0002-2245-9029
  • Truc Linh Do Thi Institute of Applied Materials Science, Vietnam Academy of Science and Technology, 01 TL29 District 12, Ho Chi Minh City, Vie tNam
  • Dai Hai Nguyen Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/16148

Keywords:

hydrogels, Centella asiatica, Drug delivery system, cytotoxicity

Abstract

Exploiting an inherently biological activity of natural compounds in Centella asiatica, a new hydrogel system with many beneficial properties was developed by a simple preparation. Gelatin-based hydrogels were in situ formed by Schiff base reaction to incorporate a Centella asiatica extract. The gelation time was controlled from 1 to more than 30 minutes by varying a composition ratio. The gelatin/aqueous Centella asiatica leaf extract-glutaraldehyde hydrogels exhibited microarchitecture and high porosity when being observed with a scanning electron microscope. The swelling ratio was reported in the range from 106% to 121%, which was an acceptable value for biomedical usage without any adverse effect on system blockage or stress. In addition, all hydrogels formed with more minor than or equal 0.5 wt% glutaraldehyde showed high cell compatibility; a Centella asiatica extract (≤ 1wt%) did not cause any effects on cell toxicity. Interestingly, the hydrogels composed of 2.5 wt% gelatin, 0.25 wt% extract, and 0.25 wt% glutaraldehyde gained 105% cell viability compared to standard culture conditions. Altogether, the gelatin/aqueous Centella asiatica leaf extract-glutaraldehyde hydrogels could become a promising candidate for tissue engineering and drug delivery platform.

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Published

08-07-2022

How to Cite

[1]
T. T. H. Thi, T. L. D. Thi, and D. H. Nguyen, “Research on the recycling of waste activated sludge as an adsorbent material for ammonium removal in wastewater”, Vietnam J. Sci. Technol., vol. 60, no. 3, pp. 527–540, Jul. 2022.

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Section

Materials