Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 837, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.155791
Keywords
Agricultural residues; Nitrogen-doped biochar; Ferrous sul fide; Hexavalent chromium
Categories
Funding
- National Natural Science Foundation of China [51964045]
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FeS nanoparticles loaded on nitrogen-doped biochar were successfully prepared by pyrolyzing coffee husks treated with Mohr's salt. The FeS/NBC composite exhibited a synergistic scavenging effect of Cr(VI) and showed promising potential for chromium pollution remediation.
FeS nanoparticles loaded on nitrogen-doped biochar (FeS/BNC) were fabricated by pyrolyzing coffee husks pretreated with Mohr's salt. The nitrogen doping and FeS loading of biochar are simultaneously achieved in one-pot pyrolysis. The elemental analysis, SEM, TEM, XRD, XPS, Raman, FTIR and N2 adsorption-desorption technologies were used to characterize the composition and structure of FeS/NBC. The appraisement for removing aqueous Cr(VI) testified that FeS/NBC offered a synergistic scavenging effect of Cr(VI) by FeS and NBC. The effect of crucial experimental conditions (FeS/NBC dosage, foreign ions, initial pH and concentration of Cr(VI) solution) were investigated. The Cr(VI) removal capacity was as high as 211.3 +/- 26 mg g(-1) under the optimized condition. The practicability of FeS/NBC was examined by using simulated actual samples from tap water and lake water. The mechanism examination showed that surface adsorption/reduction and solution reduction were implicated in the removal of Cr(VI). The current work introduces a novel FeS/NBC composite prepared by an in situ pyrolysis method with excellent potential for chromium pollution remediation.
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