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A composite nano-adsorbent for removing trivalent chromium ions in wastewater and its removal method

A composite adsorption and nano-adsorption technology, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve the problems of high cost and unstable effect, and achieve low cost, not easy to secondary pollution, easy The effect obtained

Active Publication Date: 2015-11-11
CHANGZHOU XIAOGUO INFORMATION SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the prior art, the traditional heavy metal wastewater treatment method has the disadvantages of high cost and unstable effect

Method used

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  • A composite nano-adsorbent for removing trivalent chromium ions in wastewater and its removal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Treatment of industrial wastewater with a trivalent chromium ion concentration of 20mg / L:

[0020] Sodium hydroxide and sulfuric acid were added to adjust the pH of the industrial wastewater with a trivalent chromium ion concentration of 20 mg / L to be 5. Under the condition of pneumatic ultrasonic (frequency is 20kHz, ultrasonic power is 800W), to the industrial waste water, according to the concentration of nano-ferric oxide 1g / L, the concentration of nano-nickel 1g / L, add the concentration of nano-ferric oxide and nano-nickel. The composite adsorbent is subjected to pneumatic ultrasonication at 20-25°C for 60 minutes, and is adsorbed by a magnet to separate the composite nano-adsorbent from wastewater.

[0021] It is measured that in the treated industrial wastewater, the concentration of trivalent chromium ions is 0mg / L, and the adsorption capacity △=20mg / L.

Embodiment 2

[0039] Treatment of industrial wastewater with a trivalent chromium ion concentration of 50mg / L:

[0040] Add sodium hydroxide and hydrochloric acid to adjust the pH to 6 in industrial wastewater with a trivalent chromium ion concentration of 50 mg / L. Under pneumatic ultrasonic conditions (frequency is 40kHz, ultrasonic power is 800W), according to the concentration of nano-ferric oxide 2g / L, the concentration of nano-cobalt 2g / L, add composite adsorption of nano-ferric oxide and nano-cobalt to the above wastewater Add glycerol as a dispersant (according to the concentration of 2g / L), perform pneumatic ultrasonication at 20-25°C for 60 minutes, and adsorb with a magnet to separate the composite nano-adsorbent from wastewater.

[0041] It is measured that in the treated industrial wastewater, the concentration of trivalent chromium ions is 1.7mg / L, and the adsorption capacity △=48.3mg / L.

Embodiment 3

[0058] Treatment of industrial wastewater with a trivalent chromium ion concentration of 5 mg / L:

[0059] Add sodium hydroxide and sulfuric acid to adjust the pH to 4 in industrial wastewater with a trivalent chromium ion concentration of 5 mg / L. Under pneumatic ultrasonic conditions (frequency is 20kHz, ultrasonic power is 300W), according to the concentration of nano-ferric oxide 0.5g / L, the concentration of nano-nickel is 0.5g / L, add nano-ferric oxide and nano-nickel to the above wastewater The composite adsorbent is subjected to pneumatic ultrasonication at 20-25°C for 5 minutes, and is adsorbed by a magnet to separate the composite nano-adsorbent from wastewater.

[0060] It is measured that in the treated industrial wastewater, the concentration of trivalent chromium ions is 0 mg / L, and the adsorption capacity △=5 mg / L.

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Abstract

The invention relates to a method for removing trivalent chromium ions in waste water and belongs to the technical field of waste water treatment. A compound nano absorbent is added into waste water containing trivalent chromium ions with an initial concentration of 5 to 50 mg / L to enable the content of the compound nano absorbent in the waste water to be 0.5 to 4 g / L, the pH value is regulated to 4 to 6, and a reaction is performed for 5 to 60 min at ordinary temperature under the ultrasonic and pneumatic condition, wherein the compound nano absorbent is prepared from nano ferroferric oxide and nano elemental particles, the nano elemental particles are composed of one or two of nano nickel particles, nano cobalt particles and nano iron particles, and the mass ratio of the nano ferroferric oxide to the nano elemental particles is (7:3)-(3:7). A dispersing agent can be added in the adsorption process to promote the nano absorbent to disperse during adsorption. The method has the advantages that the removal rate of waste water containing the trivalent chromium ions with the initial concentration of 5 to 20 mg / L can reach 100%, and the removal rate of waste water containing the trivalent chromium ions with the initial concentration of 50 mg / L can reach 96.6%.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a nano-adsorbent and a removal method for removing trivalent chromium ions. Background technique [0002] With the rapid development of the global economy and the continuous growth of population, the demand for water in human society is increasing rapidly. In recent decades, human consumption of fresh water has increased year by year, resulting in a large amount of waste water, which cannot be recycled, causing serious water environmental pollution, affecting the structure and function of aquatic ecosystems and the utilization of water resources, making many in the world Countries and regions face water resource crises. Among them, with the increasing production activities such as mining, smelting, and processing of heavy metals by human beings, the heavy metal ions discharged from various industrial production processes have greatly increased in both quantity and type,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06C02F1/28C02F101/22
Inventor 冯俊生徐佩佩
Owner CHANGZHOU XIAOGUO INFORMATION SERVICES
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