TY - JOUR
T1 - Synthesizing sulfidated zero-valent iron for enhanced Cr(VI) removal
T2 - Impact of sulfur precursors on physicochemical properties
AU - Lin, Zishen
AU - Zheng, Chunli
AU - Ren, Jieling
AU - Zhu, Aibin
AU - He, Chi
AU - Pan, Hua
N1 - Publisher Copyright:
© 2023
PY - 2023/6/20
Y1 - 2023/6/20
N2 - Sulfidated zero-valent iron (SZVI) samples were synthesized using different sulfur precursors, including sodium sulfide, sodium hydrosulfite, and potassium polysulfide. Sulfidation significantly increased the specific surface area and hydrophobicity of all SZVI samples, with SZVI-Na2S showing the highest specific surface area (21.7 m2/g) and optimal hydrophobicity (65.3°). Additionally, the free corrosion potential of SZVI after sulfidation was more negative than ZVI, indicating a stronger electron transfer. Furthermore, among the SZVI samples, SZVI-Na2S exhibited the highest Fe0 content (53.3%). The Cr(VI) removal efficiency was significantly enhanced by SZVI, with SZVI-Na2S, SZVI-K2S6, and SZVI-Na2S2O4 achieving removal efficiencies of 90.4%, 78.5%, and 49.9%, respectively. SZVI-Na2S exhibited the highest removal efficiency among the three SZVI samples, with a removal rate of up to 40.3 × 10−3 min−1. The enhanced removal of Cr(VI) by SZVI-Na2S was achieved through a combination of enhanced adsorption by FeS shell, rapid reduction of Cr(VI) to Cr(III) via electron transport, and precipitation of Cr(III) with S2- and Fe(II)/Fe(III) on the surface of SZVI, leading to its removal from water. These findings clarify the effects of different S precursors on the physicochemical properties of SZVI and provide insights for the rational design of an efficient Cr(VI) reducing agent.
AB - Sulfidated zero-valent iron (SZVI) samples were synthesized using different sulfur precursors, including sodium sulfide, sodium hydrosulfite, and potassium polysulfide. Sulfidation significantly increased the specific surface area and hydrophobicity of all SZVI samples, with SZVI-Na2S showing the highest specific surface area (21.7 m2/g) and optimal hydrophobicity (65.3°). Additionally, the free corrosion potential of SZVI after sulfidation was more negative than ZVI, indicating a stronger electron transfer. Furthermore, among the SZVI samples, SZVI-Na2S exhibited the highest Fe0 content (53.3%). The Cr(VI) removal efficiency was significantly enhanced by SZVI, with SZVI-Na2S, SZVI-K2S6, and SZVI-Na2S2O4 achieving removal efficiencies of 90.4%, 78.5%, and 49.9%, respectively. SZVI-Na2S exhibited the highest removal efficiency among the three SZVI samples, with a removal rate of up to 40.3 × 10−3 min−1. The enhanced removal of Cr(VI) by SZVI-Na2S was achieved through a combination of enhanced adsorption by FeS shell, rapid reduction of Cr(VI) to Cr(III) via electron transport, and precipitation of Cr(III) with S2- and Fe(II)/Fe(III) on the surface of SZVI, leading to its removal from water. These findings clarify the effects of different S precursors on the physicochemical properties of SZVI and provide insights for the rational design of an efficient Cr(VI) reducing agent.
KW - Cr(VI)
KW - Enhanced removal
KW - Oxide layer
KW - Sulfidated zero-valent iron
KW - Zero-valent iron
UR - https://www.scopus.com/pages/publications/85151685578
U2 - 10.1016/j.colsurfa.2023.131376
DO - 10.1016/j.colsurfa.2023.131376
M3 - 文章
AN - SCOPUS:85151685578
SN - 0927-7757
VL - 667
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
M1 - 131376
ER -