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Method for preparing sulfuric acid modified Leersia hexandra heavy metal biological absorbent material

A technology of biological adsorption and sulfuric acid modification, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve problems such as limitations and achieve good adsorption effects

Inactive Publication Date: 2015-09-09
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, effective separation processes for removing heavy metals include precipitation, ion exchange, electrochemical treatment, membrane technology, evaporation and solidification, etc., but the application of these technologies is limited by technology and economy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0015] 1. Preparation of Lishihe heavy metal biosorption material modified by sulfuric acid:

[0016] (1) The leaves of Lishihe were collected, washed 3 times with tap water, and then washed 3 times with ultrapure water.

[0017] (2) Put 500g of Lishihe leaves obtained in step (1) into a cowhide file bag, dry them in an air-blast drying oven at 80°C for 24 hours, then crush them with a high-speed pulverizer, and pass through a 100-mesh sieve after crushing.

[0018] (3) Put the product obtained in step (2) into a 50mL ceramic crucible, place it in a muffle furnace at 100°C for 6 hours, take it out after natural cooling, and obtain the original Lishihe heavy metal biosorbent.

[0019] (4) Dissolve 20 g of the undisturbed Lishihe heavy metal biosorbent obtained in step (3) in 1 L of sulfuric acid solution with a concentration of 3 mol / L, and react in a water bath at 45°C for 12 hours.

[0020] (5) Suction filter the product obtained in step (4), and then rinse it with ultrapu...

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PUM

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Abstract

The invention discloses a method for preparing a sulfuric acid modified Leersia hexandra heavy metal biological absorbent material. The method comprises: (1) washing Leersia hexandra leaves with tap water for 3 times, and then with ultra-pure water for 3 times; (2) drying the washed Leersia hexandra leaves, grinding the dried Leersia hexandra leaves, and filtering the ground Leersia hexandra leaves by using a 100-mesh sieve; (3) putting the filtered Leersia hexandra leaves into a ceramic crucible, keeping the ceramic crucible in a 100 DEG C muffle furnace for 6 hours, and obtaining original Leersia hexandra heavy metal biological absorbent; (4) dissolving the original Leersia hexandra heavy metal biological absorbent in sulfuric acid solution with the concentration of 3 mol / L, wherein the original Leersia hexandra heavy metal biological absorbent : sulfuric acid with the concentration of 3 mol / L = 20g : 1L, and reaction is performed at 45 DEG C for 12 hours by using a water bath; (5) leaching the substance, and rinsing the leached substance with ultra-pure water till neutrality is reached; and (6) placing the rinsed substance in a 55 DEG C oven for drying until the weight remains constant. According to the invention, the field weed Leersia hexandra is fully taken advantage of for preparing the material that absorbs heavy metals that pollute waters, and the material has a good effect of absorbing Cr(VI) in acidic, neutral, or alkaline aquatic environment. Meanwhile, the material also has a good effect of absorbing heavy metals comprising: Cr (III), Pb, Zn, Mn, Ni, and Cd.

Description

technical field [0001] The invention relates to the field of heavy metal wastewater treatment, in particular to a method for preparing a sulfuric acid-modified Lishihe heavy metal biosorption material. Background technique [0002] With the rapid development of my country's economy, heavy metal wastewater is produced in many production processes in industries such as mining and metallurgy, machinery manufacturing, chemical industry, electronics, and instrumentation. Heavy metal wastewater has the characteristics of strong toxicity, refractory degradation, easy enrichment, carcinogenicity, and mutagenicity. It is the focus and difficulty of wastewater treatment. At present, effective separation processes for removing heavy metals include precipitation, ion exchange, electrochemical treatment, membrane technology, evaporation and solidification, etc., but the application of these technologies is limited by technology and economy. [0003] Biosorption method refers to the meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
Inventor 张学洪张杏锋程志刚
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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