TY - JOUR
T1 - Unveiling the correlation of Fe3O4 fractions upon the adsorption behavior of sulfamethoxazole on magnetic activated carbon
AU - Lv, Miao
AU - Li, Dongyi
AU - Zhang, Zhaohan
AU - Logan, Bruce E.
AU - Liu, Guohong
AU - Sun, Muchen
AU - Dai, Changchao
AU - Feng, Yujie
N1 - Funding Information:
This work was supported by National Key Research and Development Program of China (No. 2016YFC0401106 ), Heilongjiang Province Natural Science Foundation (No. LH2019E042 ), and State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (No. 2019TS06 ). The authors also acknowledged the support of the Innovation Team in Key Areas of the Ministry of Science and Technology.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/2/25
Y1 - 2021/2/25
N2 - Magnetic particles (MPs) assisted powdered activated carbon (PAC) is a promising composite material for adsorption removal of micropollutants. The fractional amount of Fe3O4 impacts the balance between adsorption capacity and magnetic property of magnetic activated carbons (MPACs), and therefore it affects the extent of sulfamethoxazole (SMX) removal. Here, five MPACs with different mass ratios of Fe3O4: PAC (1:1, 1:2, 1:4, 1:6, and 1:8) were prepared using a hydrothermal method and characterized by various spectroscopic methods. The spherical shaped MPs were monolayerly deposited on PAC with fewer pores blocked when the mass ratio of Fe3O4 was comparatively low (≤ 20%). MPAC6 (14.3 wt% of Fe3O4) had the best overall performance, with good Langmuir adsorption capacities for SMX (173.0 mg g−1) and excellent magnetic properties (9.0 emu g−1). Corresponding adsorption kinetics fitted well with the pseudo second-order kinetic model. The negative ΔG0 (−25.6 to −27.2 KJ mol−1) and ΔH0 (−9.14 KJ mol−1), and positive ΔS0 (0.55 KJ mol−1 K−1) properties indicated the spontaneous and exothermic nature of the adsorption process accompanied by an increase in entropy. The strong cation-assisted electron donor-acceptor and hydrophobic interactions were contributed to a high extent of SMX removal in the pH range of 2–4. Formation of negative charge-assisted H-bonds was responsible for the adsorption of hydrophilic SMX− on negatively charged MPAC6 in alkaline solution. Desorption and regeneration experiments showed SMX removal was still 92.3% in the 5th cycle. These findings give valuable insights into the interactions between SMX and MPACs and guide for choosing sustainable magnetic adsorbents for environmental applications.
AB - Magnetic particles (MPs) assisted powdered activated carbon (PAC) is a promising composite material for adsorption removal of micropollutants. The fractional amount of Fe3O4 impacts the balance between adsorption capacity and magnetic property of magnetic activated carbons (MPACs), and therefore it affects the extent of sulfamethoxazole (SMX) removal. Here, five MPACs with different mass ratios of Fe3O4: PAC (1:1, 1:2, 1:4, 1:6, and 1:8) were prepared using a hydrothermal method and characterized by various spectroscopic methods. The spherical shaped MPs were monolayerly deposited on PAC with fewer pores blocked when the mass ratio of Fe3O4 was comparatively low (≤ 20%). MPAC6 (14.3 wt% of Fe3O4) had the best overall performance, with good Langmuir adsorption capacities for SMX (173.0 mg g−1) and excellent magnetic properties (9.0 emu g−1). Corresponding adsorption kinetics fitted well with the pseudo second-order kinetic model. The negative ΔG0 (−25.6 to −27.2 KJ mol−1) and ΔH0 (−9.14 KJ mol−1), and positive ΔS0 (0.55 KJ mol−1 K−1) properties indicated the spontaneous and exothermic nature of the adsorption process accompanied by an increase in entropy. The strong cation-assisted electron donor-acceptor and hydrophobic interactions were contributed to a high extent of SMX removal in the pH range of 2–4. Formation of negative charge-assisted H-bonds was responsible for the adsorption of hydrophilic SMX− on negatively charged MPAC6 in alkaline solution. Desorption and regeneration experiments showed SMX removal was still 92.3% in the 5th cycle. These findings give valuable insights into the interactions between SMX and MPACs and guide for choosing sustainable magnetic adsorbents for environmental applications.
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U2 - 10.1016/j.scitotenv.2020.143717
DO - 10.1016/j.scitotenv.2020.143717
M3 - Article
C2 - 33220995
AN - SCOPUS:85096391046
SN - 0048-9697
VL - 757
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 143717
ER -