紫外光/二氧化钛工艺对水溶液中苯酚光催化降解的研究

Investigation of Photocatalytic Degradation of Phenol by UV/TiO2 Process in Aquatic Solutions.

作者信息

Rahmani Ar, Samadi Mt, Enayati Moafagh A

机构信息

Dept. of Environmental Health Engineering, Hamadan University of Medical Sciences, Iran.

出版信息

J Res Health Sci. 2008 Dec 28;8(2):55-60.

PMID:23344074

Abstract

BACKGROUND

The main objective of this research was to study photocatalytic oxidation of phenol in aquatic solutions by using of UV, TiO2 and the combination of them. Phenol compounds are widely used in industries and other daily life. Highly toxicity and carcinogenicity of these compounds can causal considerable adverse effects on the aquatic ecosystems and human health.

METHODS

The study was an experimental research and carried out by phenol 100 mg L-1 solution and contact time, pH and amount of TiO2 were considered in photocatalytic system as the basic variables affecting removal efficiencies. Phenol concentration in inlet and outlet samples was detected by spectrophotometery at 500nm.

RESULTS

Combination of UV and TiO2 can cause higher efficiencies of phenol removal. The removal efficiencies of UV, TiO2 and UV/TiO2 photocatalytic oxidation system with various operation conditions had a range of 1.8%-19.64%, 2.38%-17.8% and 34.65%-82.91%, respectively. It was found that increasing of TiO2 concentration and contact time and pH , increasing the amount of phenol that oxidized in combined system and maximum removal coefficients obtained in pH=11, 9 h contact time and 0.2 gr of TiO2.

CONCLUSION

Combinated UV/TiO2 process may be applied as an effective process for the removal of phenol from aquatic solutions such as industrial wastewaters and polluted water resources.

摘要

背景

本研究的主要目的是利用紫外线、二氧化钛及其组合研究水溶液中苯酚的光催化氧化。酚类化合物广泛应用于工业和其他日常生活中。这些化合物的高毒性和致癌性会对水生生态系统和人类健康造成相当大的不利影响。

方法

本研究为实验研究，以100mg/L的苯酚溶液为研究对象，将光催化体系中的接触时间、pH值和二氧化钛用量作为影响去除效率的基本变量。通过分光光度法在500nm波长处检测进出口样品中的苯酚浓度。

结果

紫外线和二氧化钛的组合可提高苯酚的去除效率。在不同操作条件下，紫外线、二氧化钛和紫外线/二氧化钛光催化氧化体系的去除效率分别为1.8%-19.64%、2.38%-17.8%和34.65%-82.91%。研究发现，增加二氧化钛浓度、接触时间和pH值，可增加组合体系中氧化的苯酚量，在pH=11、接触时间为9小时和二氧化钛用量为0.2克时可获得最大去除系数。