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| Preparation and arsenic adsorption and its mechanisms by mulberry stem biochar/Fe-Mn oxides composite adsorbent |
| Received:December 23, 2015 |
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| KeyWord:mulberry stem;Fe-Mn oxides;preparation;adsorption;arsenic |
| Author Name | Affiliation | E-mail | | QIN Yan-min | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | LIANG Mei-na | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | liangmeinaa@163.com | | WANG Dun-qiu | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | ZHU Yi-nian | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | TANG Shen | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | LI Huan-huan | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | ZHANG Tao | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | |
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| Abstract: |
| A mulberry stem biochar/Fe-Mn oxides composite adsorbent (MBFMA) was prepared from mulberry stems by oxidation and copre cipitation methods through the orthogonal experiment. Effects of pH, ionic strength, and co-existing anions on As (Ⅴ) adsorption by MBF MA were investigated. Results show that the optimal preparation conditions were as follows:the concentrations of potassium permanganate and ferrous chloride were both 40 g·L-1, impregnation time of 24 h, calcination temperature of 400 益, and calcination time of 3 h. The range of the optimal pH values was from 2.0 to 7.0. The ions present in the natural environment, such as nitrate, sulfate, carbonate and phosphoric, had different degrees of effects on arsenic adsorption, with phosphoric having the biggest impact. The ionic strength had no obvious side effects on arsenic adsorption. The adsorption behavior of As (Ⅴ) on MBFMA was fit better with Langmuir equation than Freundlich equation. Adsorption capacity is 4.87 mg·g-1 under 25 益. Spectrum analysis showed that MBFMA had 0.34% of arsenic after adsorbing As (Ⅴ). FTIR spec tra indicated that MBFMA contained hydroxy, carboxyl, and lactone functional groups. X-ray photoelectron spectroscopy analysis indicated that iron, manganese, and carbon surface functional groups involved in the adsorption reaction, and adsorption of As (Ⅴ) by MBFMA was specific process. |
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