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A method for preparing a chromium ion adsorbent based on invasive plant stems

A technology of invasive plants and adsorbents, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve problems such as carcinogenicity, strong toxicity, and difficult treatment, and achieve improved adsorption performance, strong adsorption performance, The effect of reducing the incidence of side effects

Active Publication Date: 2019-04-02
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cr in chromium-containing wastewater is usually represented by Cr 2+ (such as CrO), Cr 3+ (such as Cr 2 o 3 ) and Cr 6+ (such as CrO 3 ) exists in the form of mainly Cr 3+ and Cr 6+ These two valence states exist, and their pollution to environmental media presents the characteristics of concealment, long-term and cumulative nature, which brings great difficulties to governance.
Cr 6+ Strong toxicity, can cause cancer; Cr 3+ Easy enrichment

Method used

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  • A method for preparing a chromium ion adsorbent based on invasive plant stems
  • A method for preparing a chromium ion adsorbent based on invasive plant stems

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Embodiment 1

[0026]An invasive plant stem base chromium ion adsorbent, the adsorbent includes a carbonized substrate and molecules assembled on the substrate; the carbonized substrate is biochar formed from natural biomass; Amines and tartaric acid. Using natural biomass as raw material, it is convenient to obtain materials and low in production cost. At the same time, it can broaden its utilization channels, increase its added value, and can specifically adsorb chromium ions. The natural substrate is easy to degrade and is environmentally friendly. obsolete purpose.

[0027] Natural biomass is corn, wheat, rice, cut flowers and other agricultural and forestry waste plant straws. Most preferably, the twigweed straw is used in this embodiment. The surface of P. canadensis straw contains a large number of acidic functional groups such as carboxyl groups and phenolic hydroxyl groups, while Cr 6+ It also has strong oxidizing properties, so the canadensis stalk has a strong effect on Cr 6+ ...

Embodiment 2

[0038] A preparation method of an invasive plant stem base chromium ion adsorbent, specifically comprising the following steps:

[0039] 1) Place the biomass in an equal proportion mixture of 15% HF and 2mol / L HCl, then vibrate for 12 hours, centrifuge to collect the precipitate, wash it with deionized water, and dry it for later use;

[0040] 2) Put the desiliconized biomass into absolute ethanol and NaOH solution with a concentration of 1mol / L in sequence, stir and soak for 2 hours respectively, then rinse with deionized water until neutral, and set aside;

[0041] 3) Add modifiers and dopants to the activated biomass for modification. Under the condition of power of 800W, microwave modification for 30min to obtain modified biomass. The trimethylamine of 1.5 times of material weight and the tartaric acid of 1.2 times, the above-mentioned dopant additions are respectively the sodium dodecylbenzenesulfonate of 0.06 times of activated biomass weight and the propylene oxide of 0...

Embodiment 3

[0044] A preparation method of an invasive plant stem base chromium ion adsorbent, specifically comprising the following steps:

[0045] 1) Place the biomass in an equal proportion mixture of 12% HF and 1.5 mol / L HCl, then vibrate for 10 hours, centrifuge to collect the precipitate, wash it with deionized water, and dry it for later use;

[0046] 2) Put the desiliconized biomass into absolute ethanol and NaOH solution with a concentration of 1mol / L in sequence, stir and soak for 1.5h respectively, then rinse with deionized water until neutral, and set aside;

[0047] 3) Add modifiers and dopants to the activated biomass for modification. Under the condition of power of 800W, microwave modification for 25min to obtain modified biomass. The trimethylamine of 1.4 times of material weight and the tartaric acid of 1.1 times, the above-mentioned dopant additions are respectively the sodium dodecylbenzenesulfonate of 0.05 times of activated biomass weight and the propylene oxide of 0...

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Abstract

A method for preparing a chromium ion adsorbent based on invasive plant stems is provided, belonging to the field of environment protection functional materials. The method includes silicon removing,activation, modification and carbonization, wherein biomass after silicon removing and activation is modified with modifying agents and doping agents and then carbonized to obtain biochar, the modifying agents are trimethylamine and tartaric acid, and the doping agents are sodium dodecylbenzenesulfonate and epoxypropane. The adsorbent includes a carbonized matrix and molecules assembled on the matrix, wherein the carbonized matrix is the biochar prepared from natural biomass, and the assembled molecules carry amino and carboxyl and are the trimethylamine and tartaric acid. The method has characteristics of low cost, high efficiency, less side reactions, high resource utilization rate, low energy consumption and low system operation consumption, and the prepared adsorbent has advantages ofhigh specific surface area, more adsorption active sites, high adsorption capability, high polarity, high adsorption performance and excellent pressure resistance.

Description

technical field [0001] The invention belongs to the field of environmental protection functional materials, and in particular relates to a preparation method of an invasive plant stem base chromium ion adsorbent. Background technique [0002] In industry, chromium and its compounds are widely used in various industries, such as pharmaceuticals, electroplating, metallurgy, leather, dyes, fur processing, machinery industry, etc. Chromium-containing wastewater mainly comes from these industries. Cr in chromium-containing wastewater is usually represented by Cr 2+ (such as CrO), Cr 3+ (such as Cr 2 o 3 ) and Cr 6+ (such as CrO 3 ) exists in the form of mainly Cr 3+ and Cr 6+ These two valence states exist, and their pollution to the environmental medium presents the characteristics of concealment, long-term and cumulative nature, which brings great difficulties to the governance. Cr 6+ Strong toxicity, can cause cancer; Cr 3+ Easy to enrich. If the human body ingests ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/22
CPCB01J20/24B01J2220/4825C02F1/286C02F2101/22
Inventor 马玉心
Owner ZHEJIANG OCEAN UNIV
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