Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 9, Issue 4, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.105407
Keywords
Chitosan; Nanoscale iron sulfide; Biochar; Hexavalent chromium; Actual wastewater
Categories
Funding
- Key Research and Development Projects of Sichuan Province, China [2019YFN0020]
- Environmental Protection Science and Technology Projects of Sichuan Province, China [2018HB30]
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The study synthesized FeS/chitosan/biochar composite (FSBC) to effectively remove Cr(VI) from water, demonstrating enhanced adsorption capacity compared to individual FeS particles and biochar. Increasing temperature promoted removal of Cr(VI), while increasing Cl- and SO42- concentrations and solution pH hindered adsorption. The results suggest that FSBC can be high-effective adsorbents for Cr(VI) removal in water environments, with the removal mechanism involving surface adsorption, reduction, and precipitation.
The purpose of this study was to synthesize FeS/chitosan/biochar composite (FSBC) to remove Cr(VI). Results indicate that the modification of FeS particles and chitosan to biochar provided large specific surface area and more active adsorption sites. FSBC(1:1:1) have an enhanced Cr(VI) adsorption capacity of 103.93 mg g-1 at 0.01 g per 50 mL Cr(VI) solution compared with 19.97 mg g-1 for FeS particles and 22.45 mg g-1 for biochar. Increasing temperature promote Cr(VI) removal. By contrast, increasing Cl-and SO42- concentrates and solution pH prevented Cr(VI) adsorption. Cr(VI) removal could attribute to surface adsorption, reduction and precipitation. XPS results indicated that 76.07% of Cr(VI) removal was due to reduction or precipitation, and 23.93% could be ascribed to surface adsorption. After adsorption-desorption cycle, Cr(VI) removal capacities are 70.42, 65.33 and 11.67 mg g-1 for FSBC(1:1:1), FSBC(1:1:5) and FSBC(5:5:1), respectively. The study demonstrated that FSBC were high-effective adsorbents for Cr(VI) removal in the water environment.
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