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	Radiation induced decomposition of a refractory cefathiamidine intermediate
	Qiburi Bao ; Lujun Chen ; Jianlong Wang ; Qiburi Bao ; Lujun Chen ; Jianlong Wang
	2016-03-30 ; 2016-03-30
关键词	Decomposition Diisopropylthiourea Ionizing radiation Wastewater X703
其他题名	Radiation induced decomposition of a refractory cefathiamidine intermediate
中文摘要	Diisopropylthiourea(DPT),an intermediate of a widely used cephalosporin,has been found to be one of the most refractory components in cephalosporin synthesis wastewater.This compound cannot be completely removed by conventional biological processes due to its antimicrobial property.Ionizing radiation has been applied in the decomposition of refractory pollutants in recent years and has proved effective.Therefore,the decomposition of DPT byγ-irradiation was studied.The compound was irradiated at the dose of 150–2000 Gy before a change of concentration and UV absorption of the solutions was detected.Furthermore,the decomposition kinetics and radiation yield(G-value)of DPT was investigated.The results of radiation experiments on DPT-containing aqueous showed that the DPT can be effectively degraded byγ-radiation.DPT concentration decreased with increasing absorbed doses.G-values of radiolytic decomposition for DPT(20 mg/L)were 1.04and 0.47 for absorbed doses of 150 and 2000 Gy,respectively.The initial concentration and p H of the solutions affected the degradation.As the concentration of substrate increased,the decomposition was reduced.The decrease of removal rate and radiation efficacy under alkaline condition suggested that lower p H values benefit theγ-induced degradation.UV absorption from 190 to 250 nm decreased after radiation while that from 250 to 300 nm increased,indicating the formation of by-products.; Diisopropylthiourea(DPT), an intermediate of a widely used cephalosporin, has been found to be one of the most refractory components in cephalosporin synthesis wastewater.This compound cannot be completely removed by conventional biological processes due to its antimicrobial property. Ionizing radiation has been applied in the decomposition of refractory pollutants in recent years and has proved effective. Therefore, the decomposition of DPT by γ-irradiation was studied. The compound was irradiated at the dose of 150–2000 Gy before a change of concentration and UV absorption of the solutions was detected.Furthermore, the decomposition kinetics and radiation yield(G-value) of DPT was investigated. The results of radiation experiments on DPT-containing aqueous showed that the DPT can be effectively degraded by γ-radiation. DPT concentration decreased with increasing absorbed doses. G-values of radiolytic decomposition for DPT(20 mg/L) were 1.04 and 0.47 for absorbed doses of 150 and 2000 Gy, respectively. The initial concentration and p H of the solutions affected the degradation. As the concentration of substrate increased,the decomposition was reduced. The decrease of removal rate and radiation efficacy under alkaline condition suggested that lower p H values benefit the γ-induced degradation. UV absorption from 190 to 250 nm decreased after radiation while that from 250 to 300 nm increased, indicating the formation of by-products.
语种	英语 ; 英语
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/144302]
专题	清华大学
推荐引用方式 GB/T 7714	Qiburi Bao,Lujun Chen,Jianlong Wang,et al. Radiation induced decomposition of a refractory cefathiamidine intermediate[J],2016, 2016.
APA	Qiburi Bao,Lujun Chen,Jianlong Wang,Qiburi Bao,Lujun Chen,&Jianlong Wang.(2016).Radiation induced decomposition of a refractory cefathiamidine intermediate..
MLA	Qiburi Bao,et al."Radiation induced decomposition of a refractory cefathiamidine intermediate".(2016).

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