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Preparation of corn cob modified magnetic heavy metal adsorption material and method for removing heavy metals from water

A technology for adsorbing materials and heavy metals, which is applied in the fields of adsorbing water/sewage treatment, alkali metal compounds, chemical instruments and methods, etc., to achieve the effects of simple and easy preparation process, simple preparation process, and easy control of reaction.

Active Publication Date: 2019-12-03
BAOJI UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects and deficiencies of the materials for the current treatment of heavy metal polluted wastewater, the purpose of the present invention is to utilize easily collected agricultural waste corn cobs as raw materials, and through physical and chemical modification, it has a positive effect on Pb 2+ 、Cu 2+ 、Cd 2+ 、Cr 2+ , Zn 2+ Heavy metal ions such as ions have high removal efficiency, and the removal rate can reach more than 98%. At the same time, after removing heavy metal ions in wastewater, the adsorption material is convenient to recover, and can effectively recover heavy metals in wastewater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Preparation of corn cob modified magnetic heavy metal adsorption material

[0024] 1. Rinse the collected corncobs, filter out the water, dry at 60°C-80°C, crush them and pass through a 60-80 mesh sieve for later use.

[0025]2. Put the corncob powder pretreated in step 1 and water in a mass ratio of 1:2 to 1:3 (to ensure that the corncob powder is fully soaked in water) into a reaction vessel with a stirrer or a suitable container, Adjust its pH to 4 with 5% nitric acid, stir at a speed of 450 rpm or place it in a shaker (260 rpm) for 1.2 h, then adjust the pH to 11.0 with 10% potassium hydroxide, Continue to stir (450 rpm) or vibrate (260 rpm) for 3 hours, then centrifuge or filter off water, wash with water and ethanol alternately until neutral, and dry in an oven at 60-80°C.

[0026] 3. Keep the chemically modified corn cob intermediate after final drying in step 2 at 480° C. for 1.5 h under the protection of an inert gas such as nitrogen or argon, and t...

Embodiment 2

[0029] Embodiment 2: the removal of heavy metal in sewage (waste) water

[0030] The corn cob modified magnetic heavy metal adsorption material obtained in Example 1 is added into heavy metal pollution (waste) water containing lead, zinc, cadmium, chromium, copper, etc. according to a certain amount, and the pH is under certain conditions. After stirring and adsorption reaction for a certain period of time, An external magnet is used to recover the adsorbent material.

[0031] Experimental results show that the corn cob modified magnetic heavy metal adsorption material obtained by the present invention contains lead, zinc, cadmium, chromium and copper at the optimal initial concentrations of 150mg / L, 150mg / L, 100mg / L, 100mg / L and 100mg / L respectively. 100mg / L, the best pH is 5, 2, 6, 4 and 4 respectively, the best use temperature is room temperature, the stirring rate is 300-400 rpm / min and evenly stirred for 2-2.5h, the best amount of adsorption material is 2.000g / L~2.500g / ...

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Abstract

The invention discloses a preparation of a corncob modified magnetic heavy metal adsorbing material and a method for removing heavy metal in the water. Through physically and chemically modifying a agricultural waste of corncob to prepare a magnetic heavy metal adsorbent which has relatively high removal capacity on heavy metal in sewage (wastewater), the resource utilization of agricultural wastes is realized, the aim of using waste to control pollution is realized, and at the same time, the difficulty of removing the conventional adsorbing materials after application is overcome. The methods of the invention have the advantages of abundant raw material sources, simple and feasible method, obvious and stable removal effect on heavy metal in water, low preparation and adsorption cost and relatively good application value.

Description

technical field [0001] The invention belongs to the field of purifying polluted (waste) water containing heavy metals, and in particular relates to the preparation of a magnetic material for removing heavy metals by modifying corncobs and a method for removing heavy metals in water. Background technique [0002] With the rapid development of industrial society, the discharge of heavy metal-containing wastewater in material processing, chemical and chemical production, metal mining production and development, and daily production and life is increasing, environmental pollution is becoming more and more serious, and human health is seriously threatened. How to eliminate the harm of heavy metals and effectively recycle heavy metals in wastewater is a very prominent problem in today's environmental protection work and needs to be solved urgently. [0003] As a waste in the agricultural production process, corncobs are large and ubiquitous. Farms or farmers generally burn or disc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/28B01J20/22C02F1/28C02F101/20C02F101/22
CPCB01J20/0229B01J20/22B01J20/28009C02F1/28C02F1/281C02F1/286C02F2101/20C02F2101/22
Inventor 范拴喜
Owner BAOJI UNIV OF ARTS & SCI
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