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Open AccessArticle

Adsorption Removal of 17β-Estradiol from Water by Rice Straw-Derived Biochar with Special Attention to Pyrolysis Temperature and Background Chemistry

by Xiaohua Wang 1,2,3, Ni Liu 1,2,*, Yunguo Liu 1,2,*, Luhua Jiang 1,2, Guangming Zeng 1,2, Xiaofei Tan 1,2, Shaobo Liu 4,5, Zhihong Yin 1,2, Sirong Tian 1,2 and Jiang Li 1,2
1
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
2
Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
3
School of Architecture and Urban Planning Hunan City University, Yiyang 413099, China
4
School of Architecture and Art, Central South University, Changsha 410082, China
5
School of Metallurgy and Environment, Central South University, Changsha 410083, China
*
Authors to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2017, 14(10), 1213; https://doi.org/10.3390/ijerph14101213
Received: 7 September 2017 / Revised: 3 October 2017 / Accepted: 6 October 2017 / Published: 11 October 2017
(This article belongs to the Section Environmental Science and Engineering)
Rice straw biochar that produced at three pyrolysis temperatures (400, 500 and 600 °C) were used to investigate the adsorption properties of 17β-estradiol (E2). The biochar samples were characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), elemental analysis and BET surface area measurements. The influences of pyrolysis temperature, E2 concentration, pH, ionic strength, background electrolyte and humic acid were studied. Kinetic and isotherm results illustrated that the adsorption process could be well described by pseudo-second-order and Freundlich models. Experimental results showed that ionic strength had less influence on the adsorption of E2 by 500 and 600 °C rice straw biochar. Further, multivalent ions had positive impact on E2 removal than monovalent ions and the influence of the pyrolysis temperature was unremarkable when background electrolyte existed in solutions. The adsorption capacity of E2 decreased with the pH ranged from 3.0 to 12.0 and the humic acid concentration from 2 to 10 mg L–1. Electrostatic attractions and π-π interaction were involved in the adsorption mechanisms. Compared to low-temperature biochar, high-temperature biochar exhibited a better adsorption capacity for E2 in aqueous solution, indicated it had a greater potential for E2 pollution control. View Full-Text
Keywords: endocrine disrupting chemicals; 17β-estradiol; rice straw biochar; pyrolysis temperature; adsorption endocrine disrupting chemicals; 17β-estradiol; rice straw biochar; pyrolysis temperature; adsorption
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MDPI and ACS Style

Wang, X.; Liu, N.; Liu, Y.; Jiang, L.; Zeng, G.; Tan, X.; Liu, S.; Yin, Z.; Tian, S.; Li, J. Adsorption Removal of 17β-Estradiol from Water by Rice Straw-Derived Biochar with Special Attention to Pyrolysis Temperature and Background Chemistry. Int. J. Environ. Res. Public Health 2017, 14, 1213.

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