Functional CdS nanocomposites recovered from biomineralization treatment of sulfate wastewater and its applications in the perspective of photocatalysis and electrochemistry
Journal
Science of the Total Environment
Journal Volume
742
Date Issued
2020
Author(s)
Abstract
The sulfur ions generated during the microbial treatment of sulfate wastewater could cause secondary pollution problem, however, the application of the biomineralization technique could convert sulfur ions into sulfide nanocomposites with diverse properties. This study constructed a multi-stage process for sulfate wastewater treatment and CdS nanocomposites (CdS-NCs) recovery by using biomineralization, which simultaneously achieved the removal of pollutants and recovery of functional nanocomposites. In this process, about 97% of the sulfate could be removed, and the CdS-NCs with a diameter of 16.0–20.2 nm were collected at different pHs. The results of FTIR and Raman proved that the biomacromolecules derived from microorganisms participated in the formation of CdS-NCs. The Mott-Schottky curve suggested that the CdS-NCs belonged to n-type semiconductors with the energy gap of 2.29–2.38 eV and could be applied as the photocatalyst, and up to 78.2% of 200 mg/L tetracycline was photodegraded catalytically by CdS-NCs obtained at pH 6.5. In the application of CdS-NCs as anodes of lithium-ion batteries, all the batteries assembled by CdS-NCs exhibited a very strong cycle performance of more than 500 cycles. This research not only effectively recovered nanocomposites with great application potential from sulfate wastewater but also provided a perspective for the utilization of recovered resources. © 2020 Elsevier B.V.
Subjects
Biomineralization; CdS nanocomposite; Electrode; Photocatalytic degradation; Sulfate wastewater
Other Subjects
Biomineralization; Cadmium sulfide; II-VI semiconductors; Ions; Lithium-ion batteries; Nanocomposites; Pollution; Recovery; Sulfur compounds; Wastewater treatment; Biomacromolecules; Diverse properties; Functional nanocomposites; Microbial treatment; Multistage process; N-type semiconductors; Secondary pollution; Sulfate wastewater; CdS nanoparticles; cadmium sulfide nanocomposite; lithium ion; nanocomposite; sulfate; tetracycline; unclassified drug; cadmium derivative; sulfate; biomineralization; catalysis; electrochemistry; nanocomposite; photolysis; sulfate; wastewater treatment; Article; biomacromolecule; biomineralization; controlled study; electrochemistry; Fourier transform infrared spectroscopy; macromolecule; particle size; pH; photocatalysis; photodegradation; pollution control; priority journal; Raman spectrometry; waste water management; biomineralization; electrochemistry; waste water; Biomineralization; Cadmium Compounds; Electrochemistry; Nanocomposites; Sulfates; Waste Water
Type
journal article