Related Experiment Video
Updated: Jun 3, 2026
15:19
Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
Removal of trichlorobenzene using 'oxygen-enriched' highly active absorbent
Yi Zhao1, Peng He, Yu-Hai Zhang
1School of Environmental Science & Engineering, North China Electric Power University, Baoding 071003, China. zhaoyi9515@163.com
Environmental Technology
|April 9, 2011
Summary
A novel
Area of Science:
- Environmental Chemistry
- Materials Science
Background:
- 1,2,4-trichlorobenzene (TCB) is a persistent organic pollutant.
- Effective removal of TCB from industrial emissions is crucial for environmental protection.
Purpose of the Study:
- To develop and optimize an 'oxygen-enriched' highly active absorbent (HAA) for 1,2,4-trichlorobenzene (TCB) removal.
- To investigate the reaction mechanism and identify intermediate products during TCB absorption.
Main Methods:
- Preparation of HAA using fly ash, industry lime, and calcium chlorite (Ca(ClO2)2).
- Experimental study of TCB removal efficiency under varying conditions (temperature, gas flow rate, oxygen content) in a custom-designed reactor.
- Analysis of reaction products using gas chromatograph/mass spectrometry (GC/MS).
Main Results:
- Optimized conditions for TCB removal: 3% (wt) additive, 100 mL/min flow rate, 250°C, and 6% oxygen.
- Maximum TCB removal efficiency of 81.71% achieved within 10 minutes.
- Identified 2,6-Bis-[1,1-Dimethylethyl]-4-methyl-Phenol as the major intermediate product.
Conclusions:
- The developed HAA demonstrates significant potential for efficient TCB removal.
- The study elucidates the reaction pathway for TCB degradation by the HAA.
- Further research can explore scaling up this technology for industrial applications.
Related Concept Videos
01:28Microbial Bioremediation of Pesticides
Pesticides often feature structurally complex chemical architectures, incorporating halogen groups and multiple aromatic rings. These characteristics confer high chemical stability, rendering many pesticides resistant to natural degradation processes. This resistance poses significant environmental concerns, as persistent pesticide residues can accumulate in ecosystems and affect non-target organisms.Despite the inherent stability of many pesticides, certain microorganisms possess the metabolic...
01:10Hydrolysis of Chlorobenzene to Phenol: Dow Process
Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is eliminated to generate the benzyne...
00:46Bioremediation
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
01:46Oxidative Cleavage of Alkenes: Ozonolysis
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
01:26Microbial Bioremediation of Hydrocarbons
Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to physical or...
01:26Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...