An Integrated Chemical Approach for the Removal of Hazardous Cr(VI) and Other Contaminants of Tannery Wastewater: Biopolymer-assisted Adsorption Separation and Conversion Into Valuable Materials

Authors

Khathijathul Kubra
V. Pavithra
Buvaneswari Gopal
Srinivas Janaswamy, South Dakota State UniversityFollow

Document Type

Article

Publication Date

2-2024

Abstract

o counter the toxic effects of Cr(VI) ions in industrial wastewater, adsorption onto a suitable adsorbent is prudent, but the resulting secondary waste accumulation and cleaning are challenging. Herein, biocompatible alginic acid has demonstrated selective adsorption of Cr(VI) ions with the subsequent conversion of the secondary waste into valuable materials. The maximum sorption was found to be 143 mg/g, and the adsorption follows the Langmuir model and pseudo-second-order kinetics. The process was tested with a simulated tannery effluent where selective Cr(VI) adsorption was achieved, and the secondary waste was converted to Cr₂O₃ and ZnCrO_4. The remaining ions present Na⁺, Cl⁺, SO₄^2- have been consolidated into an apatite mineral with the molecular formula of Ca_4.1Na_0.9(P_0.7S_0.3O₄)₃Cl. Overall, our integrated process of removing and converting Cr(VI) ions into beneficial by-products opens up a window of opportunities for large-scale water purification and industrial applications.

Publication Title

Seperation and Purification Technology

Volume

330

Issue

Part B

DOI of Published Version

10.1016/j.seppur.2023.125220

Recommended Citation

Kubra, Khathijathul; Pavithra, V.; Gopal, Buvaneswari; and Janaswamy, Srinivas, "An Integrated Chemical Approach for the Removal of Hazardous Cr(VI) and Other Contaminants of Tannery Wastewater: Biopolymer-assisted Adsorption Separation and Conversion Into Valuable Materials" (2024). Dairy Science and Food Science Faculty Publications: 2022 to Present. 46.
https://openprairie.sdstate.edu/dairy_pubs/46