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Method for promoting reduction of Cr(VI) in chromium core deposits by utilizing nano-material

A nano-material and sediment technology, applied in the field of Cr pollutant treatment, can solve problems such as slow reaction rate, achieve the effect of promoting reduction and simple operation

Inactive Publication Date: 2016-07-06
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction conditions of the biological method are mild, but the reaction rate is slow

Method used

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  • Method for promoting reduction of Cr(VI) in chromium core deposits by utilizing nano-material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Use 24ml of distilled water to completely disperse 20±1g of chrome ore deposits, and use N 2 :CO 2 =80%: 20% mixed gas was used to aerate the sample for 40 minutes, and then the sample was placed statically in a thermostat at 30°C for 25.5 days. The concentration of Cr(VI) in samples at different times was determined by diphenylcarbazide spectrophotometry. figure 1 Curve a in is the curve of Cr(VI) concentration versus time in samples not treated with nanoparticles.

Embodiment 2

[0020] Use 24ml of distilled water to completely disperse 20±1g of chrome ore deposits, then add 0.2g of nano-SiO 2 particles, with N 2 :CO 2 =80%: 20% mixed gas was used to aerate the sample for 40 minutes, and then the sample was placed statically in a thermostat at 30°C for 25.5 days. The concentration of Cr(VI) in samples at different times was determined by diphenylcarbazide spectrophotometry. figure 1 The curve b in the nano-SiO 2 Cr(VI) concentration versus time curves in the particle-treated samples.

Embodiment 3

[0022] Add 0.2g nanometer FeO according to the same steps as in Example 2 3 The chromium-containing deposits were treated with the same oxygen removal conditions as in Example 1, and then the samples were placed statically in a thermostat at 30°C for 20.5 days. The concentration of Cr(VI) in samples at different times was determined by diphenylcarbazide spectrophotometry. figure 1 The curve c in the nanometer Fe 2 o 3 Cr(VI) concentration versus time curves in the particle-treated samples.

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Abstract

The invention provides a method for promoting reduction of Cr(VI) in chromium core deposits by utilizing a nano-material, and relates to a Cr(VI) pollutant treatment method. The method provided by the invention comprises the following steps: dispersing polluted chromium core deposits around a chromium slag heap by utilizing distilled water, dissolving out Cr(VI), and then adding nano-particles; performing anaerobic treatment on various samples; placing a reactor into an incubator in a standing manner; and performing sampling at different time points, testing the Cr(VI) concentrations of the samples, and taking out the reactor till the Cr(VI) concentrations reach zero, so as to complete the reduction of Cr(VI) in the chromium core deposits. The method has advantages that the utilized nano-particles are nontoxic and harmless, cheap, easy to obtain, and small in adding amount; the effect on the reduction of Cr(VI) in the chromium core deposits is remarkable; the total reduction amount of Cr(VI) is obviously improved; and the environmental friendliness and the economic feasibility are achieved.

Description

technical field [0001] The invention relates to a treatment method for Cr(VI) pollutants, in particular to a method for promoting the reduction of Cr(VI) in chrome deposits by using nanometer materials. Background technique [0002] Chromium slag stacking is an important source of chromium pollution in sediments. Usually, about 10 tons of chromium slag will be discharged for every ton of metal chromium produced, and 2.5 to 3 tons of highly toxic chromium slag will be discharged for every ton of chromium salt produced (renewable resources research , 2004, 6, 34-38). The migration and transformation of chromium in chromium slag is very active. It can migrate among air, water, soil sediments and plants, causing serious pollution to the ecological environment. Chromium in nature mainly exists in the form of two stable oxidation states Cr(III) and Cr(VI) (Environment Pollution, 2000, 107, 263-283). Cr(III) is the most stable form of chromium, easy to form stable complexes, and ...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/00
Inventor 李清彪张雅娴王远鹏
Owner XIAMEN UNIV