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Minerals 2017, 7(4), 64; https://doi.org/10.3390/min7040064

Schwertmannite Adherence to the Reactor Wall during the Bio-Synthesis Process and Deterioration of Its Structural Characteristics and Arsenic(III) Removal Efficiency

1
Environmental Engineering Laboratory, College of Resource and Environment, Shanxi Agricultural University, Taigu 030801, China
2
Analytical Instrumentation center, Institute of coal chemistry, Chinese Academy of Sciences, 27 South Taoyuan Road, Taiyuan 030001, China
3
School of Environmental Science and Engineering, Shandong University, Jinan 250100, China
4
Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Karen Hudson-Edwards
Received: 27 March 2017 / Revised: 15 April 2017 / Accepted: 19 April 2017 / Published: 22 April 2017
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Abstract

Schwertmannite, a kind of iron oxyhydrosulfate mineral, can removal arsenic(III) from arsenic(III)-bearing groundwater by the adsorption process. In this study, schwertmannite was bio-synthesized by Acidithiobacillus ferrooxidans LX5 in shaking flasks (160 rpm) containing a 0.16 mol/L FeSO4 liquid solution. After bio-synthesis, 25.5% of the bio-synthesized schwertmannite adhered to the reactor wall (designated as adhered-sch) and the remainder was suspended in the system (designated as suspended-sch). Particles of adhered-sch exhibited a fractured structure with a small specific surface area (4.36 m2/g) and total pore volume (3.13 × 10−2 cm3/g). In contrast, suspended-sch had a spiny structure (similar in appearance to a hedgehog), and a larger specific surface area (9.62 m2/g) and total pore volume (8.01 × 10−2 cm3/g). When 0.25 g/L of adhered-sch was used as an adsorbent for arsenic(III) removal from 1 mg/L arsenic(III)-bearing waters (at pH 7.5), the arsenic(III) removal efficiency was 43.2% after 4 h of adsorption. However, this efficiency could be increased by 50% by using suspended-sch as the adsorbent. Furthermore, by adding 13.3 g/L and 26.7 g/L additional schwertmannite into the reactor system prior to schwertmannite bio-synthesis, all synthesized schwertmannite remained suspended in the bio-synthesis systems, and the ferrous ions’ bio-oxidation efficiency was improved to a certain extent. Due to the friction effect between the introduced schwertmannite and the reactor wall, adhered-sch was eliminated. The outcomes of this study will provide the necessary data for schwertmannite bio-synthesis and arsenic(III) removal from arsenic(III)-bearing groundwater. View Full-Text
Keywords: adhered schwertmannite; suspended schwertmannite; specific surface area; arsenic(III); adsorption adhered schwertmannite; suspended schwertmannite; specific surface area; arsenic(III); adsorption
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Zhang, J.; Shi, J.; Zhang, S.; Zhou, L.; Xu, J.; Ge, Y.; Fan, W.; Liu, F. Schwertmannite Adherence to the Reactor Wall during the Bio-Synthesis Process and Deterioration of Its Structural Characteristics and Arsenic(III) Removal Efficiency. Minerals 2017, 7, 64.

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