[1]邓琳,杨芳,邓南圣.小球藻引发水中Cr(Ⅵ)的光化学还原研究[J].东南大学学报(自然科学版),2008,38(6):1044-1048.[doi:10.3969/j.issn.1001-0505.2008.06.021]
 Deng Lin,Yang Fang,Deng Nansheng.Photoreduction of chromium(Ⅵ)in aqueous solutions with chlorella vulgaris under metal halide lamps[J].Journal of Southeast University (Natural Science Edition),2008,38(6):1044-1048.[doi:10.3969/j.issn.1001-0505.2008.06.021]
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小球藻引发水中Cr(Ⅵ)的光化学还原研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
38
期数:
2008年第6期
页码:
1044-1048
栏目:
环境科学与工程
出版日期:
2008-11-20

文章信息/Info

Title:
Photoreduction of chromium(Ⅵ)in aqueous solutions with chlorella vulgaris under metal halide lamps
作者:
邓琳1 杨芳1 邓南圣2
1 东南大学土木工程学院, 南京 210096; 2 武汉大学资源与环境学院, 武汉 430079
Author(s):
Deng Lin1 Yang Fang1 Deng Nansheng2
1 School of Civil Engineering, Southeast University, Nanjing 210096, China
2 School of Resources and Environmental Science, Wuhan University, Wuhan 430079, China
关键词:
光化学 还原 小球藻 Cr(Ⅵ)
Keywords:
photochemistry reduction chlorella vulgarism Cr(Ⅵ)
分类号:
X131
DOI:
10.3969/j.issn.1001-0505.2008.06.021
摘要:
重点研究了在金属卤化物灯(λ≥365 nm,250 W)光照下由小球藻类引发水体中Cr(Ⅵ)的光化学还原反应,考察了小球藻浓度、光照时间Cr(Ⅵ)初始浓度及pH值在通N2的条件下对Cr(Ⅵ)还原的影响.结果表明:随着小球藻浓度的增大,Cr(Ⅵ)的还原速率及还原率均增大; 随着小球藻浓度的增大,光照时间的增加,Cr(Ⅵ)的初始浓度降低以及溶液pH值的降低,Cr(Ⅵ)的光化学还原率逐步增大.当pH≥6时,Cr(Ⅵ)的光化学还原反应基本消失; 当pH=4时,六价铬的浓度在0.4~1.0 mg/L范围内,小球藻浓度对应的吸光度Aalga在0.025~0.180范围内,Cr(Ⅵ)的初始还原速率拟合方程为V0=kC0.17180A0.5235alga.
Abstract:
The photochemical reduction of hexavalent chromium Cr(Ⅵ)in the presence of algae, chlorella vulgaris, was investigated under the irradiation of metal halide lamps(λ≥365 nm, 250 W). The affecting factors of photochemical reduction were studied in detail under ventilating N2, including exposure time, initial Cr(Ⅵ)concentration, initial chlorella vulgaris concentration and pH. The rate of Cr(Ⅵ)photochemical reduction increases with the increase of algae concentration and exposure time.It also increases with the decrease of initial Cr(Ⅵ)concentration and the pH value. When pH ≥6, the process nearly vanishes. When initial Cr(Ⅵ)concentration ranges from 0.4 to 1.0 mg/L and initial algae concentration ranges from Aalga=0.025 to Aalga=0.180, according to the results of kinetic analyses, the kinetic equation of Cr(Ⅵ)photochemical reduction in aqueous solution with alga under the irradiation of metal halide lamps can be expressed as V0=kC00.171 80 A0.523 5alga under the condition of pH=4.

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备注/Memo

备注/Memo:
作者简介: 邓琳(1973—),男,博士,讲师,dlwhu@163.com.
基金项目: 国家自然科学基金资助项目(20477031)、生物质资源化学与环境生物技术湖北省重点实验室资助项目(HBRCEBL2007002).
引文格式: 邓琳,杨芳,邓南圣.小球藻引发水中Cr(Ⅵ)的光化学还原研究[J].东南大学学报:自然科学版,2008,38(6):1044-1048.
更新日期/Last Update: 2008-11-20