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

Xiaohua Wang, Ni Liu, Yunguo Liu, Luhua Jiang, Guangming Zeng, Xiaofei Tan, Shaobo Liu, Zhihong Yin, Sirong Tian and Jiang Li
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Xiaohua Wang: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Ni Liu: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Yunguo Liu: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Luhua Jiang: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Guangming Zeng: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Xiaofei Tan: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Shaobo Liu: School of Architecture and Art, Central South University, Changsha 410082, China
Zhihong Yin: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Sirong Tian: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Jiang Li: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China

IJERPH, 2017, vol. 14, issue 10, 1-17

Abstract: Rice straw biochar that produced at three pyrolysis temperatures (400, 500 and 600 °C) were used to investigate the adsorption properties of 17?-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 ?-? 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.

Keywords: endocrine disrupting chemicals; 17?-estradiol; rice straw biochar; pyrolysis temperature; adsorption (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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