Magnetic response heavy metal ion adsorbent and application thereof

A technology of heavy metal ions and adsorbents, which is applied in the fields of alkali metal compounds, adsorption of water/sewage treatment, alkali metal oxides/hydroxides, etc., and achieves the effects of wide practicability, simple manufacturing process and low cost

Inactive Publication Date: 2015-01-28
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

No reports on magnetic heavy metal adsorbents for cassava straw

Method used

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  • Magnetic response heavy metal ion adsorbent and application thereof
  • Magnetic response heavy metal ion adsorbent and application thereof
  • Magnetic response heavy metal ion adsorbent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The method for preparing magnetic response heavy metal ion adsorbent is:

[0027] Fresh cassava stalks were dried, crushed into 80-mesh powder, weighed 10g of wood powder, added to 300mL NaOH solution with a concentration of 4mol / L, soaked for 10h, ultrasonicated for 2h, washed with distilled water until neutral, and 1g of the product was mixed with B Diaminetetraacetic anhydride is mixed and added to the N,N-dimethylformamide liquid, the ratio of the three is 1:2:20 (mass:mass:volume), the reaction temperature is 70°C, and the reaction time is 15h, to obtain ethyl Diaminetetraacetic acid modified cassava straw adsorbent, standby;

[0028] Take 0.05mol / L FeSO 4 50mL, add 200mg iodine simple substance and mix well, preheat at 80°C for 5min, add 3.5mol / L ammonia water 10mL, react at 80°C for 20min. Generate black nanometer ferric oxide with magnetic response, separate the product with a magnet, wash with deionized water, and repeat several times to remove impurities; di...

Embodiment 2

[0037] The magnetic response heavy metal ion adsorbent was prepared according to the preparation method of Example 1. The application was: at room temperature, 84 mg of the modified adsorbent was added to 40 mL of heavy metal wastewater, the pH was controlled to be 5, the adsorbent was adsorbed for 20 minutes, and the adsorbent was separated with a magnet.

[0038] After testing, the adsorption capacity is 64.30mg / g, and the adsorption rate is 75.02%.

Embodiment 3

[0040] Prepare a magnetically responsive heavy metal ion adsorbent according to the preparation method in Example 1. When in use, add 146 mg of modified adsorbent to 40 mL of heavy metal wastewater at room temperature, control the pH to 5, adsorb for 20 minutes, and separate the adsorbent with a magnet.

[0041] After testing, the adsorption capacity is 40.08mg / g and the adsorption rate is 81.26%.

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Abstract

The invention discloses a magnetic response heavy metal ion adsorbent and application thereof. The adsorbent product is prepared by the following steps of pulverizing plant cassava straws, and then modifying by ethanedioic acid tetraacetic acid anhydride; and performing magnetic treatment. When the adsorbent is applied, the pH value of wastewater is controlled to 5-7 at room temperature, the heavy metal ion adsorbent is added, shaking adsorption is performed for 15-30min, and the magnetic response heavy metal adsorbent is separated by using a magnet. The adsorbent has a good effect of treating heavy metal ion wastewater containing copper, lead, cadmium and the like, and is a cheap and efficient novel adsorption material; and the adsorbent is simple in process and low in cost, can be separated under the action of an external magnetic field and is easy to regenerate and good in use effect, so the adsorbent is easy to popularize and use.

Description

technical field [0001] The invention relates to a heavy metal ion adsorbent, in particular to a magnetic response heavy metal ion adsorbent and application thereof. Background technique [0002] Heavy metal pollution has caused great harm to my country's water quality environment. In many places, heavy metal pollution has caused ecological imbalance, and heavy metals in food crops exceed the standard, affecting human health and causing economic losses. [0003] The agricultural waste currently used is used to adsorb and remove heavy metal ions cadmium and lead in wastewater, but the effect is not very satisfactory, and the separation of the adsorbent is difficult, and the recovery cost is high; at the same time, the loss of the adsorbent is large. In addition, there is also a method of using large-volume zeolite to adsorb cadmium and lead ions, but the adsorbent prepared in this way requires high energy for pretreatment, and the production cost is very high, which is not con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
CPCB01J20/24B01J20/28009C02F1/286
Inventor 康彩艳易辉莫蔚明伦宇龙蒙冕武陈孟林
Owner GUANGXI NORMAL UNIV
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