Preparing method and application of bio-adsorbent

A biosorbent and lead ion technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of low adsorption capacity, heavy metal pollution, etc., achieve large adsorption capacity, fast growth speed, The effect of direct and efficient recycling

Inactive Publication Date: 2015-10-07
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] The problem of heavy metal pollution in my country is serious, and there is an urgent need for high-performance, low-cost heavy metal ions (Pb 2+ 、Cu 2+ 、Cd 2+ 、Ni 2+ 、Ag + etc.) adsorption materials; however, the adsorption capacities of some common inorganic adsorption materials are all low, as shown in Table 1

Method used

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  • Preparing method and application of bio-adsorbent
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  • Preparing method and application of bio-adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the preparation method of a kind of biosorbent of the present invention, comprise the steps:

[0021] Step 1: Introduce the diatom source into the seawater culture medium, aerated culture at ambient temperature until the stable growth period to obtain the diatom liquid.

[0022] The preparation of the seawater medium is described in detail below. In this embodiment, seawater is collected from the coastal waters of Shenzhen Bay. First, sand-filtered natural seawater is used as a culture solvent, and each nutrient salt is prepared according to artificial seawater nutrient (also known as f / 2 medium, see Table 2-Table 4 for specific components. ) into natural seawater to make seawater culture medium.

[0023] Table 2 f / 2 medium formula

[0024]

[0025]

[0026] Table 3 Components of trace metal solution (Trace Metal Solution)

[0027]

[0028] Table 4 Vitamin Solution (Vitamin Solution) Components

[0029]

[0030] Then the acquisition of diato...

Embodiment 2

[0049] In this example, after the diatom frustules obtained in Example 1 adsorb lead ions to saturation, the desorption performance is analyzed.

[0050] Pb containing heavy metal ions in the initial pH range of 4 to 6 and an initial concentration of 200ppm 2+ The aqueous solution (that is, the initial ion concentration in the above experimental group 1 is 200ppm containing Pb 2+ Diatom frustules were added to the solution according to the solid-to-liquid ratio of 1 g / L, and placed in a constant temperature shaker at room temperature (25°C) for 24 hours of vibration adsorption. Refer to Example 1 for other steps.

[0051] Control the adsorption reaction time to 24h, and wait for the diatom frustules to absorb heavy metal ions Pb 2+ The adsorption equilibrium is reached, and then the aqueous solution containing lead ion-diatom frustules is centrifuged at room temperature (25° C.) (temperature 25° C., time 10 min, rotation speed 4000 rpm). The lead ion-diatom frustule after a...

Embodiment 3

[0057] In the description of Embodiment 3, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between embodiment 3 and embodiment 1 is:

[0058] In the present embodiment, the solutions containing heavy metal ions are respectively:

[0059] Experimental group 3: the initial ion concentration is 100ppm respectively containing heavy metal ions Pb 2+ 、Cu 2+ 、Cd 2+ 、Ni 2+ 、Ag + single ion solution;

[0060] Experimental group 4: heavy metal ion Pb with initial ion concentration of 100ppm 2+ 、Cu 2+ 、Cd 2+ 、Ni 2+ 、Ag + Coexisting mixed ion solution.

[0061] The pH ranges of the above-mentioned single ion solutions and mixed ion solutions are adjusted to be 4-6.

[0062] Refer to Example 1 for other steps (reaction time is 24h). The test results are shown in Table 7.

[0063] Table 7 Adsorption results of diatom frustules on heavy metal ions in single-ion solutions and mixed-ion sol...

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Abstract

The invention relates to the field of treatment of heavy metal pollution, in particular to a preparing method of bio-adsorbent. The preparing method includes the steps of A, introducing a diatom source to a seawater culture medium, and performing aeration cultivation at the ambient temperature until a stable growth phase so as to acquire diatom liquid; B, centrifuging the diatom liquid to obtain diatom concentrate; C, drying the diatom concentrate to obtain dried diatom powder; and D, pickling, drying and roasting the dried diatom powder to obtain diatom shells. The invention further discloses application, of the bio-adsorbent prepared by the preparing method, in treating lead ion containing solution. The bio-adsorbent is especially effective in selectively adsorbing heavy metal ions Pb2+; besides adsorption, the bio-adsorbent further has the advantages such that adsorption capacity is high, adsorption efficiency is high, the cost is low, and cyclic utilization is available; the adsorbing performance of the bio-adsorbent is far better than that of common bio-adsorbents; the bio-adsorbent has promising applicable prospect.

Description

technical field [0001] The invention belongs to the field of methods for treating heavy metal pollution, and in particular relates to a method for preparing a biosorbent and a method for using the biosorbent to treat lead-containing solutions. Background technique [0002] The problem of heavy metal pollution in my country is serious, and there is an urgent need for high-performance, low-cost heavy metal ions (Pb 2+ 、Cu 2+ 、Cd 2+ 、Ni 2+ 、Ag + etc.) adsorption materials; however, the adsorption capacities of some common inorganic adsorption materials are relatively low, as shown in Table 1. [0003] Table 1 Common inorganic adsorption materials on Pb 2+ Comparison of adsorption performance [0004] [0005] Marine diatom shells are extracted from marine diatoms. The surface of the shells has a large number of nano-micro-scale microporous structures, and the specific surface area is large, which is very conducive to the adsorption of heavy metal ions. At the same time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/14B01J20/30C02F1/28C02F1/62
Inventor 漆亚瑢王欣成家杨
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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