Highly efficient removal of tannic acid from wastewater using biomimetic porous materials

Baoshan Tang; Meijuan Li; Lanxiang Liu; Kai Li; Juan Xu; Jinju Ma; Hong Zhang

doi:10.1016/j.envres.2024.118252

Highly efficient removal of tannic acid from wastewater using biomimetic porous materials

Environ Res. 2024 Feb 5;252(Pt 1):118252. doi: 10.1016/j.envres.2024.118252. Online ahead of print.

Authors

Baoshan Tang¹, Meijuan Li², Lanxiang Liu³, Kai Li⁴, Juan Xu³, Jinju Ma³, Hong Zhang⁵

Affiliations

¹ Institute of Highland Forest Science, Chinese Academy of Forestry. Research Center of Engineering and Technology of Characteristic Forest Resources, Key Laboratory of Breeding and Utilization of Resource Insects, National Forestry and Grassland Administration, Kunming, 650223, China; Nanjing Forestry University, Nanjing, 210037, China.
² College of Forestry, Southwest Forestry University, Kunming, 650224, China.
³ Institute of Highland Forest Science, Chinese Academy of Forestry. Research Center of Engineering and Technology of Characteristic Forest Resources, Key Laboratory of Breeding and Utilization of Resource Insects, National Forestry and Grassland Administration, Kunming, 650223, China.
⁴ Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, China. Electronic address: lkjnkmwh@hotmail.com.
⁵ Institute of Highland Forest Science, Chinese Academy of Forestry. Research Center of Engineering and Technology of Characteristic Forest Resources, Key Laboratory of Breeding and Utilization of Resource Insects, National Forestry and Grassland Administration, Kunming, 650223, China. Electronic address: kmzhh@hotmail.com.

PMID: 38320716
DOI: 10.1016/j.envres.2024.118252

Abstract

To effectively remove tannic acid (TA) from wastewater, using green and natural materials has attracted increasing attention. Inspired by Galla Chinensis (GC) with high content of TA, this study synthesized a biomimetic porous adsorbent to mimic the GC structure using dialdehyde tapioca starch (DTS) and gelatin (GL). The TA adsorption performance and mechanism of synthetic porous material were investigated. Results revealed that the porous material exhibited a maximum TA adsorption capacity of 1072.01 mg/g, along with a high removal rate of 95.16% under the conditions of a DTS-GL mass ratio of 1:1, DTS aldehyde content of 48.16%, a solid content of 5%, and a pH of 2 at 25 °C. The adsorption of TA by DTS was not affected by water-soluble cationic and anion. The adsorption kinetics of TA on the porous material followed the pseudo-second-order model, and this Langmuir adsorption model (R² = 0.9954) which were well described the adsorption of TA by the material, indicating that the adsorption primarily occurred in a monolayer. FTIR, XRD, DSC, TG, XPS, and SEM-EDS were employed to characterize the structure characteristics of the porous material. The cross-linking between DTS and GL by Schiff base reaction imparted a chemical structure could absorb TA by hydrogen bonding. The TA desorption rates of in 30% acetone and 40% ethanol solutions were 88.76% and 91.03%, respectively. The porous material prepared by the GC-inspired approach holds promise as an ideal choice for loading polyphenolic compounds and provides a new perspective for the design and application of bioinspired engineering materials.

Keywords: Biomimetic sporous materials; Dialdehyde tapioca starch; Gelatin; Tannic acid.