超声对铁锰氧化物吸附废水中无机砷的强化效应

doi:10.19964/j.issn.1006-4990.2021-0267

摘要/Abstract

摘要：

快速吸附去除废水中无机砷的技术,由于其高效性成为污水处理领域亟需的一种技术。采用草酸沉淀法制备了不同铁锰比（物质的量比）的铁锰复合草酸盐,以铁锰复合草酸盐为前驱体通过热分解得到铁锰元素均匀分布的复合氧化物,以铁锰复合氧化物为吸附剂吸附去除废水中的无机砷。在超声波辅助下,铁锰复合氧化物对废水中无机砷的去除效果显著。实验结果表明,铁锰物质的量比为6:4的铁锰复合氧化物,因具有较高的比表面积（396.6 m²/g）和独特的形貌,超声辅助1 min对废水中无机砷的吸附率可达95%以上。吸附动力学研究表明,该吸附过程符合准二级动力学模型,吸附速率常数为1.11 g/（mg·s）。吸附剂再生实验表明,将吸附砷的吸附剂采用碳酸氢钠溶液洗脱重复用于吸附实验,吸附剂重复使用3次对砷的吸附率仍可达到83.6%。

关键词: 超声辅助, 吸附, 无机砷, 铁锰复合氧化物

Abstract:

Removal of inorganic arsenic species from wastewater by rapid adsorption technology is extremely desirable in the fields of sewerage treatment because of its high efficiency.Herein,FeMn composite oxides with varied Fe/Mn molar ratios as adsorbents were prepared via thermal decomposition of their oxalates precursors.The FeMn composite oxalate was used as the precursor to obtain the composite oxide with uniform distribution of iron and manganese elements through thermal decomposi-tion,and the iron manganese composite oxide was used as the adsorbent to adsorb inorganic arsenic in wastewater.With the aid of ultrasound,the removal effect of iron manganese composite oxide on inorganic arsenic in wastewater was remarkable.The experimental results showed that the FeMn composite adsorbent with n（Fe）:n（Mn）=6:4 exhibited above 95% of arsenite removal efficiency under ultrasonic wave within 1 min owing to its high specific surface area（396.6 m²/g） and unique morphology.The study of adsorption kinetics showed that the adsorption process conformed to the quasi second-order kinetic model,and the adsorption rate constant was 1.11 g/（mg·s）.The regeneration experiment of adsorbent showed that the adsorbent adsorbed arsenic was eluted with NaHCO₃ solution and reused in the adsorption experiment.The adsorption rate of arsenic could still reach 83.6% after the adsorbent was reused for 3 times.

Key words: ultrasound assisted, adsorption, inorganic arsenic species, FeMn composite oxides

中图分类号:

TQ642.4

谭文汐,郭小惠. 超声对铁锰氧化物吸附废水中无机砷的强化效应[J]. 无机盐工业, 2022, 54(3): 102-108.

TAN Wenxi,GUO Xiaohui. Enhanced effect of ultrasound on adsorption of inorganic arsenic species from wastewater by FeMn oxides[J]. Inorganic Chemicals Industry, 2022, 54(3): 102-108.

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样品名称	m（FeCl₂· 4H₂O）/g	m（MnCl₂· 4H₂O）/g	样品名称	m（FeCl₂· 4H₂O）/g	m（MnCl₂· 4H₂O）/g
0Fe10Mn	0.000	15.833	6Fe4Mn	9.940	5.937
1Fe9Mn	1.390	12.468	8Fe2Mn	11.929	2.968
2Fe8Mn	2.982	11.875	9Fe1Mn	12.525	1.385
4Fe6Mn	6.958	9.896	10Fe0Mn	15.905	0.000

样品	比表面积/ （m²·g^-1）	平均孔径/ nm	孔体积/ （cm³·g^-1）
0Fe10Mn	53.8	18.7	0.24
1Fe9Mn	226.8	6.2	0.34
2Fe8Mn	276.4	5.2	0.34
4Fe6Mn	257.7	4.1	0.29
6Fe4Mn	396.6	3.7	0.34
8Fe2Mn	324.0	4.3	0.34
9Fe1Mn	184.7	6.6	0.32
10Fe0Mn	147.6	7.1	0.27

吸附剂	砷初始质量浓度/（mg·L^-1）	k₂/ （g·mg^-1·s^-1）
Starch-FMBO^[7]	30	3.3 ×10^-4 As（Ⅲ）
Fe/Ce氧化物^[19]	10	4.2×10^-5 As（Ⅲ）
MIL-101（Fe）^[21]	20	2.2×10^-5 As（Ⅴ）
CoAl-LDH@boehmite^[22]	35	2.6×10^-3As（Ⅴ）

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