Preparation method of heavy metal adsorbent based on shrimp shell biomass charcoal with high specific surface area

Abstract

The invention discloses a preparation method of a heavy metal adsorbent based on shrimp shell biomass charcoal with a high specific surface area. The preparation method comprises the following steps:washing collected waste penaeus vanmamei shrimp shells with tap water; removing various impurities; carrying out air drying, and drying; carrying out temperature-rising carbonization; mixing with hydrochloric acid and removing ash; after drying and sieving, carrying out KOH or ZnCl2 modification to prepare shrimp shell based biomass charcoal; then mixing with hydrochloric acid and removing ash; filtering, and washing and drying filtering dreg; sieving and filling into a bottle. The biomass charcoal can be used for adsorbing heavy metal ions in the wastewater. The preparation method disclosed by the invention has the beneficial effects that the preparation method is simple and low in cost and an obtained product has the high specific surface area and a strong adsorption capability; the adsorption capacity on Cr<6+> and Cd<2+> in wastewater which has the mass concentration of 10 to 400mg / L and contains heavy metal ions including Cr<6+>, Cr<6+> and the like reaches 20 to 320mg / L and the adsorption rate reaches 90 percent or above; the preparation method is suitable for being popularized and better applied in the field of water treatment.

Description

technical field [0001] The invention relates to the technical field of biosorbent preparation, in particular to a method for preparing a heavy metal adsorbent based on high specific surface area shrimp shell biochar. technical background [0002] With the continuous development of the economy, environmental pollution is becoming more and more serious, and heavy metal pollution incidents are becoming more and more frequent, such as "Shimen Arsenic Poisoning", "Children's Blood Lead", and "Cadmium Rice" are all public health concerns that are most concerned by the people Representative of security incidents. In 2009, cadmium in vegetables in Liuyang, Hunan Province exceeded the standard, resulting in 509 villagers having excessive cadmium in their urine. The "Leather Milk" incident from 2009 to 2011 attracted widespread attention. In 2004, all kinds of agricultural products in Longling Village, Shaanxi Province were polluted to varying degrees by heavy metals such as lead, m...

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Problems solved by technology

[0006] The prior art, such as the Chinese invention patent whose authorized announcement number is CN 104667884 B, discloses a method for preparing a heavy metal adsorbent based on cheap biomass materials and using chitosan as a binder to load activated carbon particles on the surface. Cut off the dried rush to obtain rush particles with a length of 2mm-5mm as the substrate, prepare a chitosan solution with a concentration of 10g / L-20g / L, add 10g-30g of activated carbon powder to it, and stir to mix Disperse evenly, obtain activated carbon powder dispersion liquid, put into rush grass particle in described activated carbon powder dispersion liquid, make it immerse, then heat and stir, allow the gac particle in the activated carbon powder dispersion liquid to be deposited on the surface of rush grass particle, then Rush particles loaded with activated carbon are obtained by filtration and separation, and then baked to obtain the heavy metal adsorbent based on biomass materials; however, the activated carbon powder used in this invention has limited pore structure and high preparation costs, which is not conducive to industrial to promote

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