A method for improving the adsorption efficiency of mesoporous molecular sieves for heavy metals

A technology for adsorbing heavy metals and mesoporous molecular sieves, applied in chemical instruments and methods, adsorption water/sewage treatment, ion exchange, etc., can solve the problem of low heavy metal adsorption efficiency and achieve the effect of improving heavy metal adsorption performance

Active Publication Date: 2017-12-01
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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Problems solved by technology

[0004] In order to solve the problem of low adsorption efficiency of silicon-based mesoporous molecular sieves to heavy metals and at the same time realize the selective separation of heavy metals, the present invention provides a method for improving the adsorption efficiency of silicon-based mesoporous molecular sieves for heavy metals

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  • A method for improving the adsorption efficiency of mesoporous molecular sieves for heavy metals
  • A method for improving the adsorption efficiency of mesoporous molecular sieves for heavy metals
  • A method for improving the adsorption efficiency of mesoporous molecular sieves for heavy metals

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Embodiment 1

[0016] The preparation of embodiment 1 molecular sieve

[0017] In this embodiment, the template agent is cetyltrimethylammonium bromide as an example, but the template agent is not limited to this example.

[0018] Add 6g of quaternary ammonium salt surfactant cetyltrimethylammonium bromide to 700mL of water, stir well to dissolve, then add 250mL of ethanol and 80mL of ammonia water in turn, after fully mixing, add 20% orthosilicic acid under stirring Carry out dehydration condensation reaction of ethyl ester for 20 minutes, after aging for 24 hours, separate and wash the white sediment obtained, dry and grind to obtain a silicon-based mesoporous molecular sieve that retains the template agent, and take some samples and calcinate at 540°C for 6 hours to obtain A template-free silica-based mesoporous molecular sieve. For material characterization see figure 1 , the schematic diagram of the material structure is shown in figure 2 . Such as figure 1 As shown in A and 1B, t...

Embodiment 2

[0019] Embodiment 2 adsorption experiment

[0020] In this embodiment, the template-containing silicon-based mesoporous molecular sieve is taken as an example of a molecular sieve prepared by cetyltrimethylammonium bromide, and the heavy metal is Cu 2+ as an example, but the types of templates and heavy metals are not limited to this example.

[0021] The effect of retaining template agent on the adsorption of heavy metals by silica-based mesoporous molecular sieves was verified by adsorption experiments. Weigh 0.02 g of the above two molecular sieves and place them in a 50 mL glass centrifuge tube, add 30 mL of distilled water and a certain volume of heavy metal ions to represent Cu 2+ , after finally adjusting the volume of the system to 32mL and adjusting the pH to be neutral, shake at room temperature for 2 hours to reach adsorption equilibrium. Sampling for determination of Cu 2+ residual amount, to evaluate the adsorption performance of the material, so as to verify t...

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Abstract

The invention belongs to the technical field of heavy metal pollution control, and in particular relates to a method for improving the heavy metal adsorption efficiency of mesoporous molecular sieves. The method comprises the following steps: putting the silicon-based mesoporous molecular sieve retaining the template into water containing heavy metals, adjusting the pH to be neutral, shaking at normal temperature, and separating the molecular sieve from the water to realize the removal of heavy metal pollutants. The invention solves the problem of low adsorption efficiency of the silicon-based mesoporous molecular sieve to heavy metals, and at the same time realizes the selective separation of heavy metals.

Description

technical field [0001] The invention belongs to the technical field of heavy metal pollution control, and in particular relates to a method for improving the heavy metal adsorption efficiency of mesoporous molecular sieves. Background technique [0002] With the expansion of cities and the development of large-scale industries, the heavy metal pollution in the atmosphere, soil and water environment is increasing day by day. Heavy metal pollution is one of the main problems of water pollution. Man-made pollution such as mining, metal smelting, chemical production wastewater, application of pesticides and fertilizers, and domestic garbage, as well as natural factors such as geological erosion and weathering, can cause heavy metals to enter water bodies in various forms. Because heavy metals are highly toxic, difficult to be metabolized in the environment, easy to be enriched by organisms, and have biomagnification effects, heavy metal pollution in the water environment serious...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/30B01J41/10C02F1/28C02F1/42C02F1/62
Inventor 梁志杰刘杰赵志伟孙天一时文歆师杰
Owner LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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