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摘要
在模拟太阳光下,探讨了催化剂加入量、Cr(Ⅵ)离子初始浓度、pH、反应温度及部分无机盐对光催化还原过程的影响。结果表明:Cr(Ⅵ)离子去除率随催化剂加入量的增大而升高;随Cr(Ⅵ)离子初始浓度的增大,Cr(Ⅵ)离子去除率逐渐减小,当初始浓度达到0.025g/L时,Cr(Ⅵ)去除率几乎不再随光照时间的增加而变化;体系酸碱度对还原过程影响较大,Cr(Ⅵ)离子去除率随pH减小逐渐增大;反应温度为25℃时Cr(Ⅵ)离子还原程度最高;在相同的加入量下,Na2SO3溶液能够提高Cr(Ⅵ)离子光催化还原率,而K2S2O8、NaCl溶液具有明显的抑制作用。
Abstract
The influence of the amount of catalyst,the initial concentration of Cr(Ⅵ) ion,pH value,reaction temperature and some inorganic salts on the photocatalytic reduction process were investigated under simulated sunlight.The results showed that Cr(Ⅵ) ion removal rate increased with increasing the amount of Cr(Ⅵ) ions.Cr(Ⅵ) removal rate decreased gradually with the increase of initial concentration.When the initial concentration reached 0.025g/L,the removal rate of Cr(Ⅵ) almost did not change with the prolonging of irradiation time.The state of Cr(Ⅵ) ion and the oxidation-reduction reaction were greatly affected by pH value of system.The removal rate of Cr(Ⅵ) increased with the decrease of pH value.The reaction temperature was 25℃.The reduction of Cr(Ⅵ) was the highest when the reaction temperature was 25℃.The photocatalytic reduction rate of Cr(Ⅵ) ions was enhanced by Na2SO3 solution,while K2S2O8 and NaCl solution had obvious inhibitory effect.
关键词
Cr(Ⅵ)
/
TiO2催化剂
/
光催化还原
Key words
Cr(Ⅵ)
/
TiO2 catalyst
/
photocatalytic reduction
太阳光下TiO2光催化还原Cr(Ⅵ)影响因素研究[J].
化工新型材料, 2018, 46(8): 191-194 DOI:
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基金资助
国家自然科学基金(51172284)
