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- Title
Adsorption of 17β-estradiol by a novel attapulgite/biochar nanocomposite : Characteristics and influencing factors.
- Authors
Zhihong Yin; Yunguo Liu; Xiaofei Tan; Luhua Jiang; Guangming Zeng; Shaobo Liu; Sirong Tian; Sijia Liu; Ni Liu; Meifang Li
- Abstract
A novel attapulgite/biochar (ATP/BC) nanocomposite was synthesized via simultaneous activation and carbonization for 17β-estradiol (E2) removal in water. The one-step synthetic process significantly enlarged specific surface area and increased oxygen-contained functional groups. Compared to the pristine biochar (BC) and attapulgite (ATP), the ATP/BC nanocomposite exhibited higher adsorption capacity for E2 with the maximum adsorption capacity (qmax) of 154.23 mg/g. The pseudo-second-order and Langmuir model were more suitable for E2 adsorption by ATP/BC. The adsorption capacity of ATP/BC for E2 was affected by initial solution pH and the low pH was favorable for the adsorption of E2. The presence of monovalent cations (Na+ and K+) improved the adsorption efficiency for E2, whereas the presence of divalent cations of (Ca2+ and Mg2+) inhibited the adsorption process of E2. Ionic strength had slight promoting effect at low concentration for the E2 adsorption. The presence of surfactant and humic acid inhibited the adsorption capacity of ATP/BC. Electrostatic attraction, π-π interactions and hydrogen bonds between ATP/BC and E2 molecules might be potential adsorption mechanisms. The results showed that the ATP/BC nanocomposite was a high efficiency and reusable adsorbent in the removal of E2 from water.
- Subjects
BIOCHAR; FULLER'S earth; WATER purification; CHEMICAL synthesis; NANOCOMPOSITE materials
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2019, Vol 121, p155
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2018.10.022