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Method for treating lead-containing wastewater by using corn stigma as biomass adsorbent

A technology of biomass adsorbent and corn silk, which is applied in the direction of adsorption of water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems such as the decline of adsorption rate, and achieve fewer steps, faster speed, The effect of a wide range of raw material sources

Active Publication Date: 2014-05-28
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Experiments have shown that Radix Radix Radix dregs pretreated with sodium hydroxide can only -1 When the concentration of metal increases, the adsorption rate is as high as 95%, and the adsorption rate decreases significantly with the increase of the initial metal concentration.

Method used

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  • Method for treating lead-containing wastewater by using corn stigma as biomass adsorbent
  • Method for treating lead-containing wastewater by using corn stigma as biomass adsorbent
  • Method for treating lead-containing wastewater by using corn stigma as biomass adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The corn silk is first washed with distilled water to remove soil and impurities, and then dried in a blast drying oven at 50°C. The dried corn silk is cut into pieces with scissors to obtain a corn silk biomass adsorbent with an average length of 3-4cm, and then Pack into bags for later use.

Embodiment 2

[0027] Accurately pipette 40mL, a series of concentrations (20, 40, 60, 80 and 100mg·L -1 ) of Pb 2+ The solution was placed in a 250mL Erlenmeyer flask with 0.1mol·L -1 hydrochloric acid / sodium hydroxide to adjust the pH to 5.0, add 0.150 g of the corn silk prepared in Example 1 as an adsorbent, and at 25 ° C, after adsorbing on a constant temperature oscillator with a rotation speed of 120 rpm for 5 h, filter it with a mesh of 2 mm. Take the filtrate, dilute different multiples, and measure Pb with flame atomic absorption spectrophotometer 2+ concentration. The results are shown in Table 1.

[0028] Pb 2+ The adsorption rate is calculated according to the following formula (the same below):

[0029]

[0030] In the above formula, C 0 Pb in wastewater before adsorption 2+ Concentration (mg·L -1 ), C is the remaining Pb in the wastewater after adsorption for a certain period of time 2+ Concentration (mg·L -1 )

[0031] Table 1: The effect of adsorbents on Pb in l...

Embodiment 3

[0035] Accurately pipette 40mL, a series of concentrations (100, 200, 300, 400 and 500mg·L -1 ) of Pb 2+ The solution was placed in a 250mL Erlenmeyer flask with 0.1mol·L -1 hydrochloric acid / sodium hydroxide to adjust the pH to 5.0, add 0.150 g of the corn silk prepared in Example 1 as an adsorbent, and at 25 ° C, after adsorbing on a constant temperature oscillator with a rotation speed of 120 rpm for 5 h, filter it with a mesh of 2 mm. Take the filtrate, dilute different multiples, and measure Pb with flame atomic absorption spectrophotometer 2+ concentration. The results are shown in Table 2.

[0036] Table 2: The effect of adsorbents on Pb in lead-containing wastewater with different initial mass concentrations 2+ The removal effect of

[0037] Initial Pb 2+ Concentration (mg·L -1 )

[0038] It can be seen from Table 2 that the adsorption rate decreases with the increase of the initial metal concentration within the experimental value range. When the i...

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Abstract

The invention relates to a method for treating lead-containing wastewater by using corn stigma as a biomass adsorbent. The method comprises the steps as follows: (1) the corn stigmas is washed, dried and sheared, wherein the average length is 3-4 cm, so that corn stigmas biomass adsorbent is obtained;(2) the pH value of the lead-containing wastewater to be treated is regulated to 1.0-6.0, the above corn stigmas biomass adsorbent is added, and oscillation and adsorbing are performed, wherein the use amount ratio of the lead-containing wastewater and the corn stigmas biomass adsorbent is (30-50mL):(0.05-0.25g), the adsorption temperature is 20-30 DEG C, and the adsorption time is 0.5-10 h. According to the invention, compared with other biomass adsorbent, the biomass adsorbent adopted in the method has the advantages as follows: the preparation process is simpler, the steps are less, the raw materials of the adsorbent are wide in source, and cheap in price, and belong to agricultural wastes; the prepared corn stigma biomass adsorbent has a good treatment effect on heavy metal at low concentration, is over 95 percent in the adsorption rate, and the adsorption can be basically completed within 30 minutes.

Description

technical field [0001] The invention belongs to the field of heavy metal wastewater adsorbents, in particular to a method for treating lead-containing wastewater using corn silk as a biomass adsorbent. Background technique [0002] Metal lead is used in electroplating, metal processing, ore processing, mineral smelting, battery manufacturing, petroleum refining, paint pigments, pesticides, printed electronics and other industries. While lead is widely used, it also pollutes the environment to varying degrees. . With the development of society, the treatment and comprehensive recycling of lead-containing wastewater is a problem that cannot be ignored in the production of lead-acid batteries, electroplating, mining, printing, coatings and other industries. Because the traditional lead-containing wastewater treatment technology has disadvantages such as large consumption of chemical reagents and energy, possibility of secondary pollution, high treatment cost, and small amount ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
Inventor 赵晓祥尹珊珊龚娟耿艳芳汪杏
Owner DONGHUA UNIV
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