Method for treating p-nitrobenzoic acid wastewater with activated carbon through catalytic reduction

A technology of p-nitrobenzoic acid and activated carbon, applied in the direction of reduced water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., to achieve low requirements for reaction equipment, cost saving, and simple and easy methods Effect

Inactive Publication Date: 2014-09-17
BEIJING NORMAL UNIVERSITY
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At present, there are no related invention patents for the catalytic reduction method to treat p-nitrobenzoic acid wastewater

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  • Method for treating p-nitrobenzoic acid wastewater with activated carbon through catalytic reduction
  • Method for treating p-nitrobenzoic acid wastewater with activated carbon through catalytic reduction
  • Method for treating p-nitrobenzoic acid wastewater with activated carbon through catalytic reduction

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Embodiment 1

[0023] Embodiment 1: Sodium thiosulfate reduces p-nitrobenzoic acid wastewater

[0024] In 8 1L anaerobic simulated reactors, adding pH is 7 phosphate buffer solution and concentration is the p-nitrobenzoic acid waste water of 30mg / L, is filled with high-purity nitrogen (to remove the nitrogen in the reaction system) in the reactor. Oxygen, form anaerobic environment), add 35mg / L, 100mg / L, 170mg / L, 240mg / L reducing agent sodium thiosulfate solution respectively in the reactor, then, do not add catalyst in No. 1-4 reactor, In No. 5-8 reactor, add 0.5g gac respectively (make its concentration be 0.5g / L) as reaction catalyst. The reactor is sealed and placed in a rotary oscillator, and the reaction is shaken at a speed of 150-200 rpm at normal temperature and pressure for 48 hours. After the reaction, the reduced product is p-aminobenzoic acid. The conversion rate of p-nitrobenzoic acid is shown in Table 1.

[0025] Table 1 Conversion rate of p-nitrobenzoic acid under sodium th...

Embodiment 2

[0027] Embodiment 2: Reductive conversion of p-nitrobenzoic acid under different catalyst concentration conditions

[0028] Different from Example 1, in 5 reactors, add respectively the reducing agent sodium thiosulfate solution of 100mg / L, then, add a certain amount of activated carbon (making its concentration be 0.1,0.3,0.5, 0.7, 1.0g / L) as the reaction catalyst. The reactor was sealed and placed in a rotary shaker, and the reaction was shaken at a speed of 150-200 rpm at normal temperature and pressure for 48 hours. The conversion rate of p-nitrobenzoic acid is shown in Table 2.

[0029] Table 2 Reductive transformation of p-nitrobenzoic acid under different catalyst concentrations

[0030]

Embodiment 3

[0031] Embodiment 3: the reductive transformation of p-nitrobenzoic acid when catalyst is reused

[0032] Different from Example 1, in 5 reactors, add respectively the reducing agent sodium thiosulfate solution of 170mg / L; 4, 6, 8 times) as a reaction catalyst. The reactor was sealed and placed in a rotary shaker, and the reaction was shaken at a speed of 150-200 rpm at normal temperature and pressure for 48 hours. The conversion rate of p-nitrobenzoic acid is shown in Table 3.

[0033] Table 3 Reductive transformation of p-nitrobenzoic acid under different catalyst concentrations

[0034]

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Abstract

The invention belongs to the technical field of wastewater treatment for environmental protection and relates to a method for treating p-nitrobenzoic acid wastewater with activated carbon through catalytic reduction. The method comprises the following main steps: adding a buffer solution and a certain concentration of p-nitrobenzoic acid wastewater to an anaerobic simulation reactor containing activated carbon weighed in advance, filling 99.99% of high-purity nitrogen into a reaction system (so as to remove oxygen in the system to form an anaerobic environment), adding a certain concentration of reducing agent, namely a sodium thiosulfate solution, to the system and finally putting the reactor in a rotary oscillator and carrying out oscillating reaction at normal temperature and pressure. The method has the advantages that the reaction system is mild, the reaction is quick and efficient and the treatment cost is low, so that the method can conduce to solving practical problems and has obvious economic and environmental advantages.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and relates to a method for treating p-nitrobenzoic acid wastewater by catalytic reduction of activated carbon. Background technique [0002] Aromatic nitro compounds are important organic chemical raw materials and intermediates, and the environmental pollution caused by long-term accumulation of industrial wastewater due to biodegradation has attracted widespread attention. p-Nitrobenzoic acid is a useful organic synthesis intermediate mainly used in the production of medicine (preparation of anesthetics), dyes and pesticides. Currently, small amounts of nitrobenzoic acids are found in air, water and soil. These substances are irritating to the eyes, skin, mucous membranes and upper respiratory tract. [0003] Traditional methods for treating organic wastewater include biochemical methods, adsorption methods, liquid membrane methods, electrochemical metho...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F101/38
Inventor 刘新会巩文雯梁宝翠赵胜男侯静
Owner BEIJING NORMAL UNIVERSITY
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