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

Abstract

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

CLC Number:

TQ642.4

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.

Figures/Tables 10

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References 22

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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）

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Enhanced effect of ultrasound on adsorption of inorganic arsenic species from wastewater by FeMn oxides

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