Preparation method and application of sulfurized nano-iron modified composite material based on heavy metal polluted wastewater remediation
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A composite material and nano-iron technology, which is applied in the field of preparation of sulfided nano-iron modified composite materials to achieve the effects of large removal, improved reactivity and improved dispersibility
Pending Publication Date: 2021-08-24
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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[0004] The purpose of the present invention is to address the problems existing in the existing heavy metal-polluted water body remediation technol...
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Embodiment 1
[0017] Preparation of biochar (BC): Wash and dry the cattails, grind and sieve, weigh 10g cattails in a crucible, add 50% H 3 PO 4 The solution was stirred evenly and left to stand for 24 hours, then placed in a muffle furnace for anaerobic calcination at 469.5°C for 90 minutes, then immersed in a 10% HCl solution for 30 minutes, vacuum filtered, dried, ground and sieved, and stored for later use.
[0018] The scanning electron microscope figure of BC in the present embodiment 1 is as figure 1 As shown, the surface is rough and uneven.
Embodiment 2
[0020] Preparation of sulfide nano-iron (S-nZVI): add 0.075M FeSO to the three-necked flask after passing through nitrogen to remove oxygen 4 solution, and then add 200mL of 0.20M NaBH dropwise with a peristaltic pump 4 and an appropriate amount of Na 2 After the S (S / Fe molar ratio is 0.56) mixed solution was added dropwise, it was fully stirred for 30 minutes, and the obtained black particles were collected by a magnet, washed with ultrapure water and absolute ethanol several times, centrifuged, and vacuum-dried for storage.
[0021] The scanning electron microscope figure of S-nZVI in the present embodiment 2 is as figure 2 As shown, the S-nZVI particles aggregated together in a spherical shape.
Embodiment 3
[0023] Preparation of biochar-supported sulfide nano-iron (S-nZVI / BC): add 0.075M FeSO 4 solution and 1g of BC, stir evenly, then add 200mL of 0.20M NaBH dropwise with a peristaltic pump 4 and an appropriate amount of Na 2 After the S (S / Fe molar ratio is 0.56) mixed solution was added dropwise, it was fully stirred for 30 minutes, and the obtained black particles were collected by a magnet, washed with ultrapure water and absolute ethanol several times, centrifuged, and vacuum-dried for storage.
[0024] The scanning electron microscope picture of S-nZVI / BC in the present embodiment 3 is as follows image 3 As shown, the S-nZVI particles were dispersed on the surface of BC as small particles, but the distribution was not uniform.
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Abstract
The invention relates to a preparation method and application of a sulfurized nano-iron modified composite material based on heavy metal polluted wastewater remediation, the sulfurized nano-iron modified composite material takes typha orientalis as a raw material, and the preparation method comprises the following specific preparation steps: drying, grinding and sieving typha orientalis, adding an H3PO4 solution, calcining in a muffle furnace, soaking in an HCl solution, filtering, drying and grinding to obtain biochar; dissolving chitosan in an HNO3 solution under the condition of continuously introducing nitrogen, adding charcoal, then adding into a FeSO4. 7H2O solution, and uniformly stirring; and dropwise adding a mixed solution of NaBH4 and Na2S, fully and uniformly stirring, collecting by using a magnet, centrifuging, and drying to obtain the vulcanized nano-iron modified composite material. The composite material is simple in preparation process and low in cost; the composite material has a good removal effect on divalent cadmium ions in a water body, and the removal amount is large. The method can be used for repairing heavy metal polluted water bodies generated by smelting, electroplating, metal processing and manufacturing and the like.
Description
technical field [0001] The invention relates to the fields of new nanometer materials and water environment restoration, in particular to a preparation method and application of a sulfurized nano-iron modified composite material based on the restoration of heavy metal polluted wastewater. Background technique [0002] Cadmium (Cd) ranks first among the 12 dangerous chemicals of global significance proposed by the United Nations Environment Programme. Cd in water comes from industries such as mining, metal smelting, and electroplating. Cd can be enriched in organisms through the food chain, inhibit the growth of certain plants, damage the human nervous system and digestive system, and pose a serious threat to human health and safety. Therefore, it is urgent to seek an efficient and low-energy method to remediate Cd pollution in water. Commonly used methods to remove Cd pollution from water include ion exchange, chemical precipitation, biological removal, membrane separation,...
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