A preparation method of modified sepiolite and its application in environmental restoration
A sepiolite and modification technology, applied in the field of preparation of modified sepiolite, can solve the problems of insufficient environmental protection, complex process and high preparation cost, and achieve the effects of easy popularization, less dosage and good effect
Active Publication Date: 2021-07-02
YONKER ENVIRONMENTAL PROTECTION
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Problems solved by technology
2016104067230 discloses a preparation method and application of modified sepiolite powder. The modification method requires the use of organic solvents and acid solutions, which is not environmentally friendly; the process is complicated, the preparation cost is relatively high, and the adsorption performance of heavy metal cadmium is particularly It is the adsorption / passivation performance of heavy metal cadmium in soil that needs to be further improved
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Embodiment
[0024] This embodiment provides a method for preparing an organically modified sepiolite heavy metal cadmium adsorbent, comprising the following steps:
[0025] a. Mix 10g of natural sepiolite with deionized water at a mass ratio of 1:20, stir to form a sepiolite suspension and let stand for 24 hours to swell the sepiolite.
[0026] b. Add 1.0 g of sodium diethyldithiocarbamate into the above swollen solution, stir at 60° C. for 2 h, and then continue stirring at room temperature for 24 h.
[0027] c. Put it in a funnel, wash the solid 6 times with deionized water until the filtrate does not contain sodium diethyldithiocarbamate, dry at 60°C for 12 h, and grind to obtain organically modified sepiolite.
[0028] like Figure 1a and Figure 1b As shown, 470 cm -1 is Mg-O, 670 cm -1 and 800 cm -1 It is Si-O, 3676cm -1 and 3627cm -1 is-OH, 3450 cm -1 It is zeolite water, 1040cm -1 is the Si-O-Si vibration peak. 1372cm -1 and 1500cm -1 are the unique C-S and C-N vibra...
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Abstract
The invention discloses a preparation method of modified sepiolite and its application in environmental restoration. The preparation method of modified sepiolite comprises the following steps: (1) according to the mass ratio, natural sepiolite: Ionized water = 1:10‑50 mixed, stirred to form a sepiolite suspension and left to stand for 6‑24 hours; (2) Add sodium diethyldithiocarbamate to the solution in step (1), and stir; Among them, the mass ratio of sodium diethyldithiocarbamate to sepiolite=0.05‑0.3:1; (3) The stirred solution is separated from solid to liquid, and the solid is washed with deionization, dried, and ground to obtain modified sea foam pumice.
Description
technical field [0001] The invention relates to a preparation method of modified sepiolite and its application in environmental restoration, belonging to the technical field of preparation of heavy metal cadmium adsorption materials. Background technique [0002] In recent years, with the development of industry and mining, heavy metals have greatly increased in quantity and variety, and a large area of farmland has been polluted by heavy metals. Hunan Province is known as the "Hometown of Non-ferrous Metals". In addition, most of the farmland in the south is acidic, which is conducive to the dissolution and migration of heavy metals. The cadmium rice incident caused by farmland cadmium pollution has shocked the whole country, and farmland heavy metal pollution has become one of the most serious environmental problems, seriously threatening the quality and safety of agricultural products and the stability of agricultural regional ecosystems. The treatment of heavy metals ...
Claims
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IPC IPC(8): B01J20/22B01J20/30C02F1/28B09C1/00C02F101/20
CPCB01J20/12B01J20/22B09C1/00C02F1/285C02F2101/20
Inventor 贺前锋符云聪赵瑰施刘代欢刘晨张义
Owner YONKER ENVIRONMENTAL PROTECTION