Nano ferric oxide adsorbents with self-acidification effect for efficient adsorption of Sb(V)

被引：15
作者：
Feng, Xiuping [1 ]
Yan, Ruixin [2 ]
Zhang, Qinggang [1 ]
Wan, Qun [1 ]
Hagio, Takeshi [3 ]
Ichino, Ryoichi [3 ]
Kong, Long [1 ]
Cao, Xinde [1 ]
Li, Liang [1 ,4 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, China UK Low Carbon Coll, Shanghai 201306, Peoples R China
[3] Nagoya Univ, Inst Innovat Future Soc, Chikusa Ku, Nagoya, Aichi 4648603, Japan
[4] Shanghai Inst Pollut Control & Ecol Secur, 1239 Siping Rd, Shanghai 200092, Peoples R China
来源：
CHEMOSPHERE | 2021年 / 272卷 / 272期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
Sb(V) removal; Nano ferric oxide; Self-acidification; Adsorption; Mechanism analysis; IRON; REMOVAL; ANTIMONY; WATER; MECHANISM; OXIDATION; SB(III);
D O I：
10.1016/j.chemosphere.2021.129933
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
It is urgent and essential to remove antimony from wastewater due to its potential carcinogenicity. In this paper, a nano ferric oxide (NFO) adsorbent was synthesized in a one-step low temperature calcination (150 degrees C) process. It presents a surprising self-acidification behavior, could automatically adjust the pH to around 4 from different intimal pH values (4-9), which enable it to efficiently remove more than 99% of Sb(V) from wastewater in a wide pH range. X-ray photoelectron spectroscopy analysis proved that the self-acidification function was originated from the hydrolyzation of surface Fe atoms on ferric oxide nanoparticles. The maximum adsorption capacity of this adsorbent is 78.1 mg/g which is 2-3 times higher than that of the samples obtained at higher temperatures (250 degrees C and 350 degrees C), and also its adsorption kinetic constant is ten times higher, which can be attributed to the larger surface areas and smaller sizes of ferric oxides synthesized at 150 degrees C. In the actual wastewater treatment, the effluent's concentration after treatment can be maintained below the instrument detection limit even under low initial antimony concentration. We believe that this new adsorbent has great potential in the practical application in the treatment of Sb polluted wastewaters due to its simple synthesis, high efficiency, and low cost. (C) 2021 Elsevier Ltd. All rights reserved.
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页数：9
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