Bone black capable of efficiently oxidizing trivalent arsenic in water and application of bone black

A trivalent arsenic and water oxidation technology, applied in the direction of oxidation water/sewage treatment, water pollutants, other chemical processes, etc., can solve the problems of unsuitable application, increase of large dosage, long reaction time, etc., and achieve high-efficiency oxidation Trivalent arsenic, no secondary pollution, simple synthesis method

Active Publication Date: 2020-07-10
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can realize the oxidation of As(III), the oxidation efficiency is low, and it must be under very acidic conditions (i.e. pH 2) to achieve a higher oxidation effect than other pH conditions.
In the actual application process, it needs to increase a large amount of dosage, the reaction time is long (24 hours), the cost is high, and it cannot be applied to the actual application

Method used

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  • Bone black capable of efficiently oxidizing trivalent arsenic in water and application of bone black
  • Bone black capable of efficiently oxidizing trivalent arsenic in water and application of bone black
  • Bone black capable of efficiently oxidizing trivalent arsenic in water and application of bone black

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Preparation of bone char before acid treatment

[0033] Step 1): crush the bovine bone to particles with a particle size of less than 0.5 cm, then wash the bovine bone powder several times with deionized water, and dry it in an oven at 80° C. to obtain the bovine bone powder.

[0034] Step 2): Put 20g of bovine bone powder in a vacuum tube furnace, raise the temperature to 850°C in a nitrogen atmosphere, the heating rate is 15°C / min, stop heating after keeping for 60min, and take it out at room temperature to obtain the original bone char (i.e. Bone char before acid treatment), SEM sees figure 1 , see XRD image 3 A in

[0035] According to the above steps, the original bone chars carbonized at 950 °C and 1050 °C were prepared respectively, SEM see figure 1 , see XRD image 3 A in

[0036] 2. Bone charcoal preparation

[0037] Step 1): Soak the raw bone charcoal prepared above in 3mol / L hydrochloric acid, sonicate for 10 minutes, and oscillate (200rpm) for 30 m...

Embodiment 2

[0039] Example 2: Research on Oxidation of Trivalent Arsenic by Bone Char prepared at Different Pyrolysis Temperatures

[0040] Step 1): Prepare trivalent arsenic solutions with a concentration of 5 mg / L and 10 mg / L, and the solvent is ultrapure water.

[0041] Step 2): Bone charcoal, biochar and activated carbon materials prepared at different pyrolysis temperatures in Example 1 before and after acid treatment were used for trivalent arsenic oxidation experiments. The activated carbon was analytically pure and purchased from Guangzhou Chemical Reagent Factory. The preparation steps of biochar are as follows: the biomass raw material palm is crushed to particles with a particle size of less than 0.5 cm, placed in a vacuum tube furnace, and heated to the pyrolysis temperature under the protection of nitrogen (400 ° C and 500 ° C pyrolysis to prepare two groups of biochars, respectively). carbon), pyrolyzed for 2 hours; then soaked in 3mol / L hydrochloric acid, ultrasonicated fo...

Embodiment 3

[0046] Example 3: Research on the oxidation of trivalent arsenic by bone charcoal under different pH conditions

[0047] Step 1): Prepare a trivalent arsenic solution with a concentration of 5 mg / L, and the solvent is ultrapure water.

[0048] Step 2): According to Example 2, it can be known that the acid-treated bone char pyrolyzed at 950°C has the best oxidation effect on trivalent arsenic, so the acid-treated bone char material pyrolyzed at 950°C prepared in Example 1 was used for different Kinetic experiment of trivalent arsenic oxidation under the condition of pH value, using 0.1mg / L HCl and 0.1mg / L NaOH solution to adjust the initial pH value of the trivalent arsenic solution to 5.5, 7.5 and 8.5 respectively, and the dosage of bone char material is 0.1g / L, the reaction system is 20mL, placed in a 50mL centrifuge tube.

[0049] Step 3): Start timing after feeding, and take samples at specified time points. The sampling times are 0, 15, 30, 60, 120, 180, and 300 minutes ...

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Abstract

The invention discloses bone black capable of efficiently oxidizing trivalent arsenic in water and application of the bone black. The bone charcoal is prepared by the following steps: crushing ox bones into particles with the particle size of less than 0.5 cm, then cleaning ox bone powder with water, and drying the ox bone powder; putting the ox bone powder into a vacuum tube furnace, heating to 500-1100 DEG C under the protection of nitrogen or inert gas, and keeping for 1-3 hours to obtain bone black before acid treatment; soaking the prepared bone black before acid treatment in an acid solution, then washing with water until the pH value of the solution does not change and finally drying to obtain the bone black capable of efficiently oxidizing trivalent arsenic in water. The bone blackhas an ultra-large specific surface area (more than 1000m < 2 >/g) and can directly utilize oxygen to generate reactive oxygen species so that rapid oxidation of As (III) is realized, no additional chemical oxidation reagent is needed, an effective material can be provided for trivalent arsenic pollution remediation in environments such as water bodies, and the bone black is beneficial to application in practical engineering.

Description

technical field [0001] The invention relates to bone charcoal capable of efficiently oxidizing trivalent arsenic in water and its application. Background technique [0002] Arsenic (As) is a toxic metalloid element and one of the main pollutants in the aquatic environment. In recent decades, with the rapid development of urbanization and industrialization in my country, a large amount of arsenic-containing pyrite mining and metal smelting have led to increasingly serious arsenic emissions, which have caused great damage to the safety of surface and groundwater, and eventually passed through the food chain and Drinking water poses a serious hazard to human health, especially trivalent arsenic. As in water mainly exists as compounds of trivalent arsenic (As(III)) and pentavalent arsenic (As(III)). Compared with As(V), As(III) is more toxic, and As(III) mainly forms non-ionic H in water 3 AsO 3 It exists and is difficult to be removed by adsorption. Therefore, the oxidation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28C02F1/72B01J20/30C02F101/10
CPCB01J20/20C02F1/727C02F1/283C02F2101/103B01J2220/4875
Inventor 方利平李芳柏刘凯
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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