TY - JOUR
T1 - One-pot hydrothermal synthesis of magnetic N-doped sludge biochar for efficient removal of tetracycline from various environmental waters
AU - Ma, Yongfei
AU - Lu, Tingmei
AU - Tang, Jiayi
AU - Li, Ping
AU - Mašek, Ondřej
AU - Yang, Lie
AU - Wu, Li
AU - He, Liuyang
AU - Ding, Yongzhen
AU - Gao, Feng
AU - Qi, Xuebin
AU - Zhang, Zulin
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (No. 52170171 , and No. 51878523 ), Central Public-interest Scientific Institution Basal Research Fund (No. Y2022GH10), the “111” Project of China and the Scottish Government’s Rural and Environment Science and Analytical Service Division (RESAS).
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/6/7
Y1 - 2022/6/7
N2 - Efficient removal of zwitterionic tetracycline (TC) from water is a critical environmental challenge which is not fully addressed by conventional treatment technologies. A magnetic N-doped sludge biochar (MNSBC) was the first time synthesized by a simple one-pot hydrothermal method. The maximum adsorption capacity of MNSBC for TC was 197.3 mg/g at 298 K. Solution pH, ionic species/strength and humic acid concentration were the critical factors affecting TC adsorption by MNSBC. Elovich and Freundlich models better describing the experimental data illustrated that TC adsorption onto MNSBC was a multi-layer physicochemical adsorption process. Lewis acid-base, π-π conjugation, electrostatic interactions and pore filling were the main adsorption mechanisms. MNSBC also exhibited excellent adsorption performance for TC in various environmental waters, which achieved removal rates of up to 91.6%, 89.0%, 82.0% and 80.8% in mineral, tap, lake and river waters, respectively. The magnetic susceptibility of MNSBC allowed it to be easily collected after adsorption. Regeneration using NaOH could maintain its sustainable adsorption performance. Furthermore, MNSBC showed a very low release levels of iron and total nitrogen at all pH ranges (from 3 to 11), which suggested its suitability for water treatment applications. This study developed a simple technology for synthesis of effective TC adsorbent for different environmental waters and identified a circular economy pathway to reuse of water industry wastes.
AB - Efficient removal of zwitterionic tetracycline (TC) from water is a critical environmental challenge which is not fully addressed by conventional treatment technologies. A magnetic N-doped sludge biochar (MNSBC) was the first time synthesized by a simple one-pot hydrothermal method. The maximum adsorption capacity of MNSBC for TC was 197.3 mg/g at 298 K. Solution pH, ionic species/strength and humic acid concentration were the critical factors affecting TC adsorption by MNSBC. Elovich and Freundlich models better describing the experimental data illustrated that TC adsorption onto MNSBC was a multi-layer physicochemical adsorption process. Lewis acid-base, π-π conjugation, electrostatic interactions and pore filling were the main adsorption mechanisms. MNSBC also exhibited excellent adsorption performance for TC in various environmental waters, which achieved removal rates of up to 91.6%, 89.0%, 82.0% and 80.8% in mineral, tap, lake and river waters, respectively. The magnetic susceptibility of MNSBC allowed it to be easily collected after adsorption. Regeneration using NaOH could maintain its sustainable adsorption performance. Furthermore, MNSBC showed a very low release levels of iron and total nitrogen at all pH ranges (from 3 to 11), which suggested its suitability for water treatment applications. This study developed a simple technology for synthesis of effective TC adsorbent for different environmental waters and identified a circular economy pathway to reuse of water industry wastes.
U2 - 10.1016/j.seppur.2022.121426
DO - 10.1016/j.seppur.2022.121426
M3 - Article
JO - Separation and Purification Technology
JF - Separation and Purification Technology
SN - 1383-5866
M1 - 121426
ER -