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Title: Removal of aromatic nitro compounds from water by ozonation

Abstract

Experimental studies were carried out on the removal of five species of aromatic nitro hydrocarbons by ozonation. Ultraviolet spectrograms with distinct absorption peaks were plotted for each of them. It has been found that the absorbances of aqueous solutions containing the single compounds mentioned above increase to different extents at the wave lengths ranging from 200 to 230 nanometers with increase of ozone dosages. This is ascribed to the nitrite ions splitting out of the benzene rings and being further oxidized to nitrate ions by ozonation. It has been indicated that the removal of the five species of aromatic nitro compounds by ozonation can well be expressed mathematically by first order reaction equations. Besides, the reaction constants and half-life periods for various species of the tested nitro compounds were calculated at different temperatures and pH. An ozonation effect index (OI) was developed in the study to express the degree of degradation of substrates by ozonation, by means of which the five aromatic nitro hydrocarbons were compared with each other and finally ranked in the following order from greatest to smallest degrees of degradation: p-nitroaniline {gt} nitrobenzene {gt} p-dinitrobenzene {gt} p-nitrotoluene {gt} m-dinitrobenzene. It has also found that the CODm/M ratiomore » increases with ozone doses. This means that some easily degradable intermediates are produced, and increase in concentration with increase of ozone dose in the ozonation process. The mechanisms of removing the five aromatic nitro hydrocarbons are discussed from the viewpoint of orienting effects of substituent groups on the aromatic rings.« less

Authors:
;  [1]
  1. Water Pollution Control Research Centre Harbin Architectural and Civil Engineering Inst., Harbin (China)
OSTI Identifier:
5884359
Resource Type:
Journal Article
Journal Name:
Ozone: Science and Engineering (The Journal of the International Ozone Association); (United States)
Additional Journal Information:
Journal Volume: 10:1; Journal ID: ISSN 0191-9512
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 01 COAL, LIGNITE, AND PEAT; NITRO COMPOUNDS; OZONIZATION; PH VALUE; TEMPERATURE EFFECTS; ULTRAVIOLET SPECTRA; WATER TREATMENT; CHEMICAL REACTIONS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; SPECTRA; 540320* - Environment, Aquatic- Chemicals Monitoring & Transport- (1990-); 010900 - Coal, Lignite, & Peat- Environmental Aspects

Citation Formats

Baozhen, Wang, and Jun, Yin. Removal of aromatic nitro compounds from water by ozonation. United States: N. p., Web.
Baozhen, Wang, & Jun, Yin. Removal of aromatic nitro compounds from water by ozonation. United States.
Baozhen, Wang, and Jun, Yin. . "Removal of aromatic nitro compounds from water by ozonation". United States.
@article{osti_5884359,
title = {Removal of aromatic nitro compounds from water by ozonation},
author = {Baozhen, Wang and Jun, Yin},
abstractNote = {Experimental studies were carried out on the removal of five species of aromatic nitro hydrocarbons by ozonation. Ultraviolet spectrograms with distinct absorption peaks were plotted for each of them. It has been found that the absorbances of aqueous solutions containing the single compounds mentioned above increase to different extents at the wave lengths ranging from 200 to 230 nanometers with increase of ozone dosages. This is ascribed to the nitrite ions splitting out of the benzene rings and being further oxidized to nitrate ions by ozonation. It has been indicated that the removal of the five species of aromatic nitro compounds by ozonation can well be expressed mathematically by first order reaction equations. Besides, the reaction constants and half-life periods for various species of the tested nitro compounds were calculated at different temperatures and pH. An ozonation effect index (OI) was developed in the study to express the degree of degradation of substrates by ozonation, by means of which the five aromatic nitro hydrocarbons were compared with each other and finally ranked in the following order from greatest to smallest degrees of degradation: p-nitroaniline {gt} nitrobenzene {gt} p-dinitrobenzene {gt} p-nitrotoluene {gt} m-dinitrobenzene. It has also found that the CODm/M ratio increases with ozone doses. This means that some easily degradable intermediates are produced, and increase in concentration with increase of ozone dose in the ozonation process. The mechanisms of removing the five aromatic nitro hydrocarbons are discussed from the viewpoint of orienting effects of substituent groups on the aromatic rings.},
doi = {},
journal = {Ozone: Science and Engineering (The Journal of the International Ozone Association); (United States)},
issn = {0191-9512},
number = ,
volume = 10:1,
place = {United States},
year = {},
month = {}
}