Method for removing arsenic in contaminated acid by ferroferric oxide/kaolin nanocomposite
阅读说明：本技术 一种四氧化三铁/高岭土纳米复合材料去除污酸中砷的方法 (Method for removing arsenic in contaminated acid by ferroferric oxide/kaolin nanocomposite ) 是由 祁先进 李雪竹 李国华 祝星 王�华 卢治旭 段孝旭 杨妮娜 于 2020-05-22 设计创作，主要内容包括：本发明涉及一种四氧化三铁/高岭土纳米复合材料去除污酸中砷的方法,属于重金属污染治理技术领域。本发明利用FeCl<Sub>3</Sub>·6H<Sub>2</Sub>O和FeSO<Sub>4</Sub>·7H<Sub>2</Sub>O制备出含Fe<Sub>3</Sub>O<Sub>4</Sub>的混合物A,利用含Fe<Sub>3</Sub>O<Sub>4</Sub>的混合物A和高岭土纳米材料制备出Fe<Sub>3</Sub>O<Sub>4</Sub>/高岭土纳米复合材料；利用Fe<Sub>3</Sub>O<Sub>4</Sub>/高岭土纳米复合材料与污酸反应去除污酸中的砷。本发明将Fe<Sub>3</Sub>O<Sub>4</Sub>负载在高岭土纳米管表面,使得Fe<Sub>3</Sub>O<Sub>4</Sub>具有更好的分散性,从而可以吸附更多的砷离子。(The invention relates to a method for removing arsenic in contaminated acid by a ferroferric oxide/kaolin nano composite material, belonging to the technical field of heavy metal pollution treatment. The invention utilizes FeCl 3 •6H 2 O and FeSO 4 •7H 2 Preparation of Fe from O 3 O 4 Using a mixture A containing Fe 3 O 4 The mixture A and kaolin nano material are used for preparing Fe 3 O 4 A kaolin nanocomposite; using Fe 3 O 4 The kaolin nano composite material reacts with the waste acid to remove arsenic in the waste acid. Hair brushMinghe Fe 3 O 4 Loaded on the surface of kaolin nanotube to make Fe 3 O 4 Has better dispersibility, thereby adsorbing more arsenic ions.)
1. A method for removing arsenic in contaminated acid by a ferroferric oxide/kaolin nano composite material is characterized by comprising the following specific steps:
(1) FeCl is added3•6H2O and FeSO4•7H2Adding O into the alkaline aqueous solution, mixing uniformly, and then carrying out hydrothermal reaction to obtain the Fe-containing iron3O4Mixture A of (1);
(2) in step (1) containing Fe3O4Adding a kaolin nano material into the mixture A to obtain a mixture B, and stirring the mixture B for reaction for 4-6 hours;
(3) in N2Dropwise adding NH into the mixture B under the atmosphere3•H2O until the pH value of the solution reaches 12-14;
(4) separating the reaction product of the step (3) by a magnet to obtain a magnetic substance, and washing the magnetic substanceAnd drying at high temperature for 10-12 h to obtain Fe3O4A kaolin nanocomposite;
(5) fe prepared in the step (4)3O4Mixing the/kaolin nano composite material with contaminated acid, reacting for 6-8 hours at the temperature of 40-50 ℃ under the stirring condition, carrying out solid-liquid separation to obtain arsenic-containing solid and filtrate, carrying out stockpiling treatment on the arsenic-containing solid, and carrying out deep arsenic removal treatment on the filtrate.
2. The method for removing arsenic from waste acid by using the ferroferric oxide/kaolin nanocomposite material according to claim 1, wherein the method comprises the following steps: step (1) FeCl3•6H2O and FeSO4•7H2The molar ratio of O is (2-3) to 1, FeCl3•6H2O and FeSO4•7H2The ratio of the total mass of O to the volume of the alkaline aqueous solution mg: mL is (0.8-1.2) to 2.
3. The method for removing arsenic from waste acid by using the ferroferric oxide/kaolin nanocomposite material according to claim 1, wherein the method comprises the following steps: the mass ratio of the mixture A to the kaolin nano material in the step (2) is (0.8-1.2): 3.
4. The method for removing arsenic from waste acid by using the ferroferric oxide/kaolin nanocomposite material according to claim 1, wherein the method comprises the following steps: step (3) NH3•H2The dropping rate of O is 1-3 drops/s.
5. The method for removing arsenic from waste acid by using the ferroferric oxide/kaolin nanocomposite material according to claim 1, wherein the method comprises the following steps: fe in step (5)3O4The solid-to-liquid ratio g: mL of the/kaolin nanocomposite to the contaminated acid is 3 (15-20).
6. The method for removing arsenic in waste acid by using the ferroferric oxide/kaolin nanocomposite according to claim 5, wherein the method comprises the following steps: the arsenic content in the waste acid is 1000.0-1800.0 mg/L.
Technical Field
The invention relates to Fe3O4A method for removing arsenic in contaminated acid by using kaolin nano composite material belongs to the technical field of heavy metal pollution treatment.
Background
Arsenic, commonly known as arsenic, is a nonmetallic element, and its compound has strong toxicity and is harmful to human body, animals and plants. Arsenic is present in large quantities in water resources and in soil through natural and artificial effects, which pose a great threat to human and plant health. Ferroferric oxide, chemical formula Fe3O4. The black iron oxide is also called magnetic iron oxide because it is a black crystal with magnetism. Kaolin is a non-metallic mineral, a clay and claystone based on clay minerals of the kaolinite group. Both of them have good effect on treating arsenic-containing waste water.
The currently widely applied method for treating the waste acid is a lime neutralization precipitation method, although the method has simple process and low treatment cost, the method has incomplete harmless treatment in practical application and large amount of secondary hazardous waste residues. A large amount of waste residues which are difficult to treat and pile are stored in the environment, so that toxic elements are easy to release to pollute the environment, the treated water is high in hardness and difficult to recycle, and the treatment cost of the waste residues is high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides Fe3O4Method for removing arsenic in waste acid by using kaolin nanocomposite, namely Fe3O4Uniformly loaded on the surface of the kaolin nanotube to form Fe3O4Kaolin nanocomposite, Fe in composite3O4Contains a large amount of Fe ions which can react with As in the waste acid to generateFeAsO4The compound complexes As ions in the solution, thereby achieving the effect of removing arsenic; fe3O4The/kaolin nano composite material has the property of much higher than Fe3O4Can adsorb and catalyze to react more arsenic ions.
A method for removing arsenic in contaminated acid by a ferroferric oxide/kaolin nano composite material comprises the following specific steps:
(1) FeCl is added3•6H2O and FeSO4•7H2Adding O into the alkaline aqueous solution, mixing uniformly, and then carrying out hydrothermal reaction to obtain the Fe-containing iron3O4Mixture A of (1);
(2) in step (1) containing Fe3O4Adding a kaolin nano material into the mixture A to obtain a mixture B, and stirring the mixture B for reaction for 4-6 hours;
(3) in N2Dropwise adding NH into the mixture B under the atmosphere3•H2O until the pH value of the solution reaches 12-14;
(4) separating the reaction product obtained in the step (3) by using a magnet to obtain a magnetic substance, washing and drying the magnetic substance at high temperature for 10-12 h to obtain Fe3O4A kaolin nanocomposite;
(5) fe prepared in the step (4)3O4Mixing the/kaolin nano composite material with contaminated acid, reacting for 6-8 hours at the temperature of 40-50 ℃ under the stirring condition, carrying out solid-liquid separation to obtain arsenic-containing solid and filtrate, carrying out stockpiling treatment on the arsenic-containing solid, and carrying out deep arsenic removal treatment on the filtrate.
FeCl in the step (1)3•6H2O and FeSO4•7H2The molar ratio of O is (2-3) to 1, FeCl3•6H2O and FeSO4•7H2The ratio of the total mass of O to the volume of the alkaline aqueous solution mg: mL is (0.8-1.2) to 2;
preferably, the alkaline aqueous solution is a NaOH aqueous solution, and the concentration of the NaOH aqueous solution is 0.04-0.06 g/mL;
preferably, the temperature of the hydrothermal reaction is 60-80 ℃, and the time of the hydrothermal reaction is 6-8 h.
The mass ratio of the mixture A and the kaolin nano material in the step (2) is (0.8-1.2): 3, and the stirring speed is 500-700 r/min.
Said step (3) NH3•H2The dropping rate of O is 1-3 drops/s.
Fe in the step (5)3O4The solid-liquid ratio g: mL of the/kaolin nano composite material to the contaminated acid is 3 (15-20), and the stirring speed is 400-600 r/min.
The arsenic content in the waste acid is 1000.0-1800.0 mg/L.
The invention has the beneficial effects that:
(1) in the invention, Fe3O4Uniformly loaded on the surface of the kaolin nanotube to form Fe3O4Kaolin nanocomposite, Fe in composite3O4Contains a large amount of Fe ions which can react with As in the waste acid to generate FeAsO4The compound complexes As ions in the solution, thereby achieving the effect of removing arsenic;
(2) the invention utilizes Fe3O4Kaolin nano composite material for removing arsenic and Fe in waste acid3O4The compound with good dispersibility is obtained when the compound is loaded on the kaolin nanotube, has good magnetism, can be repeatedly used, is easy to be separated by a magnet, avoids secondary pollution, and simultaneously has good Fe3O4Greatly improves the adsorption efficiency and increases the adsorption quantity of arsenic.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but the scope of the present invention is not limited to the description.