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Novel magnetic iron/lanthanum composite arsenic removal adsorbing material and preparation method thereof

A composite material and composite adsorption technology, which is used in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc. problems, to achieve good recyclability, simple elution and regeneration, and cost reduction

Active Publication Date: 2018-04-17
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorption capacity of such adsorbents still cannot meet the actual demand.
In recent years, studies have shown that rare earth metal compounds have a better affinity for arsenic ions, but the high cost and cumbersome separation process limit the large-scale production and application of materials

Method used

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  • Novel magnetic iron/lanthanum composite arsenic removal adsorbing material and preparation method thereof
  • Novel magnetic iron/lanthanum composite arsenic removal adsorbing material and preparation method thereof
  • Novel magnetic iron/lanthanum composite arsenic removal adsorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0021] Step 1, weighing medicine; According to the metering coefficient ratio 1:2:4, weigh 0.433 g lanthanum nitrate hexahydrate (La(NO 3 ) 3 ·6H 2 O), 0.5406 g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and 0.6645 g terephthalic acid (H 2 BDC).

[0022] Step 2. Dissolving the drug: put the weighed drug into a PTFE liner with a capacity of 80 mL; take 50 mL of N,N-dimethylformamide (DMF) with a graduated cylinder, and pour it into the above container , stir evenly to obtain a clear and transparent solution;

[0023] Step 3, hydrothermal reaction: Put the above-mentioned reactor with clarified solution into an electric oven, set the temperature at 150 °C, and time: 900 min; until the reaction is completed.

[0024] Filtration and drying: When the oven is lowered to room temperature, take out the reaction kettle, filter, and wash with DMF, deionized water, and ethanol three times respectively, collect samples, and dry them in a vacuum oven (parameters such as: T = 120 °C...

Embodiment example 2

[0028] Step 1, weighing medicine; According to the ratio of coordination metering coefficient 0.4:2:4, weigh 0.1732 g lanthanum nitrate hexahydrate (La(NO 3 ) 3 ·6H 2 O), 0.5406 g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and 0.6645 g terephthalic acid (H 2 BDC); according to the coordination stoichiometric coefficient ratio of 1:2:4, weigh 0.433 g lanthanum nitrate hexahydrate (La(NO 3 ) 3 ·6H 2 O), 0.5406 g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and 0.6645 g terephthalic acid (H 2 BDC); according to the coordination stoichiometric coefficient ratio of 2:2:4, weigh 0.866 g lanthanum nitrate hexahydrate (La(NO 3 ) 3 ·6H 2 O), 0.5406 g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and 0.6645 g terephthalic acid (H 2 BDC).

[0029] Step 2. Dissolving the drug: put the weighed drug into three 80 mL polytetrafluoroethylene liners; take 50 mL of N,N-dimethylformamide (DMF) with a measuring cylinder, pour into the above container and stirred vigorously with a...

Embodiment example 3

[0035] The iron / lanthanum composite material synthesized in Case 1 was used to simulate the removal of As(V) in water. The detailed process is as follows:

[0036] Step 1. Prepare a series of As(V) solutions with gradient settings such as: 2.5 mg / L, 5 mg / L, 10 mg / L, 25 mg / L, 50 mg / L, 75 mg / L, 100 mg / L L, 150 mg / L and 200 mg / L. Use 0.1 mol / L hydrochloric acid to adjust the above series of solutions to pH = 7.0±0.2, set aside.

[0037] Step 2, the dosage is controlled as: 0.25 g / L, and the shaker parameters are set as: 200 rpm, 25 °C; put the series of solutions in step 1 into the shaker, and shake at constant temperature for 24 h.

[0038] Step 3: Sampling 5 mL with a disposable syringe, filtered through a 0.22 μm aqueous membrane, and analyzed and quantified by inductively coupled plasma-spectroscopy (ICP-OES).

[0039] image 3 It is the adsorption isotherm of iron / lanthanum composite material, and the maximum adsorption capacity is 410mg / g simulated by Langmuir model.

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Abstract

The invention discloses a novel magnetic iron / lanthanum composite arsenic removal adsorbing material and a preparation method thereof. The composite adsorbing material is prepared by the steps: by taking a ferric iron salt, a trivalent lanthanum salt and a ligand terephthalic acid as a precursor and taking N,N-dimethyl formamide (DMF) as a medium solvent, carrying out a solvothermal reaction to obtain a bimetallic-organic framework material; and calcining the coordination product in an air atmosphere to further obtain the composite magnetic adsorbent composed of ferric oxide (Fe2O3) and lanthanum oxide carbonate (La2O2CO3).The composite magnetic adsorbent synthesized in the invention can effectively utilize strong adsorption property of lanthanum on arsenate and utilize magnetic separationperformance of the ferric oxide, and more importantly has outstanding advantages of being easy to recover, recyclable and the like. The novel magnetic iron / lanthanum composite arsenic removal adsorbing material disclosed by the invention provides a selection for removing arsenic and other heavy metals in drinking water, domestic sewage and industrial wastewater and has important actual application value.

Description

technical field [0001] The invention relates to the development of a composite adsorbent for removing arsenic ions in water bodies (drinking water and sewage), specifically provides a novel magnetic iron / lanthanum composite adsorbent for efficiently removing arsenic and its preparation method, belonging to the technical field of water treatment . Background technique [0002] The pollution of heavy metals in water has always been a worldwide problem that plagues mankind. Among them, highly toxic arsenic has a more serious impact on human health and the natural environment. Studies have shown that in Bangladesh, Chile, Argentina, India, China, Australia and many other countries and regions, about 150 million people are threatened by high-arsenic water. In order to reduce the risk of arsenic-containing compounds, in 1993, the World Health Organization (WHO) established a new standard for drinking water, which was reduced from the original maximum allowable value of 50 μg / L t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/28C02F1/28B01J20/30C02F101/10
CPCB01J20/06B01J20/28009C02F1/281C02F2101/103
Inventor 付明来霍江波徐垒
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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