A series of biopolymer based complex were manufactured by coordinating iron ions to the abundant amino-and sulfur-containing groups in the modified wool and used as heterogeneous Fenton-like photocatalyst for 4-chloro...A series of biopolymer based complex were manufactured by coordinating iron ions to the abundant amino-and sulfur-containing groups in the modified wool and used as heterogeneous Fenton-like photocatalyst for 4-chlorophenol (4-CP) degradation in the presence of H2O2. Hydroxylamine hydrochloride (NH2OH center dot HCl) or acrylic acid was employed to modify the natural wool to strengthen the interaction with iron and to reinforce the structural stability. The NH2OH center dot HCl modified wool based complex showed the best catalytic performance for 4-CP degradation. The strong coordination between iron and great number of hydroxamic acid in this modified complex leads to the least iron leaching during the tests. HO center dot species was confirmed to be the dominant reactive oxidant in the decontamination process. The approach presented in this study can provide a new approach for developing novel bioployermer-based photocatalysts for efficient degradation of toxic organic pollutants such as 4-CP. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.展开更多
通过液相还原法制备岩棉负载纳米零价铁(Nano zero-valent iron loaded on rock wool,RW/nZVI),并利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)等手段对其物质组成及微观形貌进行表征。以对溶液中U(Ⅵ)的去除能力为...通过液相还原法制备岩棉负载纳米零价铁(Nano zero-valent iron loaded on rock wool,RW/nZVI),并利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)等手段对其物质组成及微观形貌进行表征。以对溶液中U(Ⅵ)的去除能力为考核指标,运用等温吸附模型和动力学模型研究其去除溶液中U(Ⅵ)的机理。结果表明,岩棉负载可以明显改善纳米零价铁的团聚,且对溶液中U(Ⅵ)有较好的去除效果,其吸附等温线符合Langmuir模型,模拟最大吸附量为79.681 mg/g,动力学过程符合准二级吸附动力学和准一级还原动力学,表明吸附为单分子层吸附,且是通过吸附和还原作用去除溶液中的U(Ⅵ)。展开更多
The clinical symptoms of a disorder which is known locally as ＂wool-eating ailment＂ in Guizhou semi-fine wool sheep in the Weining County of Guizhou Province, China, are poor weight gain, lost appetite, pica, emacia...The clinical symptoms of a disorder which is known locally as ＂wool-eating ailment＂ in Guizhou semi-fine wool sheep in the Weining County of Guizhou Province, China, are poor weight gain, lost appetite, pica, emaciation, and wool-eating. The mineral composition of forage, and samples of blood, liver and wool from Guizhou semi-fine wool sheep in affected ranches were compared with those from the unaffected areas. The mean concentration of iron in forage from affected pasture was significantly higher than that from the unaffected pasture. The mean concentration of sulfur in forage from the affected and unaffected pasture was similar and within normal ranges. The mean concentration of sulfur in blood, liver and wool from the affected Guizhou semi-fine wool sheep was significantly lower than that from the unaffected sheep while the content of iron in blood, liver and wool from the affected sheep was significantly higher than that from the unaffected sheep. Oral administration of calcium sulfate prevented and cured the disease. We concluded that the disease of Guizhou semi-fine wool sheep in the Weining County is due to S deficiency caused by the high Fe in forages.展开更多
基金National Natural Science Foundation of China (grant nos.51268001,21303141) for support of this work
文摘A series of biopolymer based complex were manufactured by coordinating iron ions to the abundant amino-and sulfur-containing groups in the modified wool and used as heterogeneous Fenton-like photocatalyst for 4-chlorophenol (4-CP) degradation in the presence of H2O2. Hydroxylamine hydrochloride (NH2OH center dot HCl) or acrylic acid was employed to modify the natural wool to strengthen the interaction with iron and to reinforce the structural stability. The NH2OH center dot HCl modified wool based complex showed the best catalytic performance for 4-CP degradation. The strong coordination between iron and great number of hydroxamic acid in this modified complex leads to the least iron leaching during the tests. HO center dot species was confirmed to be the dominant reactive oxidant in the decontamination process. The approach presented in this study can provide a new approach for developing novel bioployermer-based photocatalysts for efficient degradation of toxic organic pollutants such as 4-CP. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
文摘通过液相还原法制备岩棉负载纳米零价铁(Nano zero-valent iron loaded on rock wool,RW/nZVI),并利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)等手段对其物质组成及微观形貌进行表征。以对溶液中U(Ⅵ)的去除能力为考核指标,运用等温吸附模型和动力学模型研究其去除溶液中U(Ⅵ)的机理。结果表明,岩棉负载可以明显改善纳米零价铁的团聚,且对溶液中U(Ⅵ)有较好的去除效果,其吸附等温线符合Langmuir模型,模拟最大吸附量为79.681 mg/g,动力学过程符合准二级吸附动力学和准一级还原动力学,表明吸附为单分子层吸附,且是通过吸附和还原作用去除溶液中的U(Ⅵ)。
基金supported financially by the National Natural Science Foundation of China (40930533/ D011004)the China Agriculture Research System (CARS-40-30)+2 种基金the Science Foundation of Bijie District Grant, China (200905)the Guizhou Provincial Key Technologies R&D Program, China (NY[2010]3041)the Guizhou Governor Foundation, China (2009129)
文摘The clinical symptoms of a disorder which is known locally as ＂wool-eating ailment＂ in Guizhou semi-fine wool sheep in the Weining County of Guizhou Province, China, are poor weight gain, lost appetite, pica, emaciation, and wool-eating. The mineral composition of forage, and samples of blood, liver and wool from Guizhou semi-fine wool sheep in affected ranches were compared with those from the unaffected areas. The mean concentration of iron in forage from affected pasture was significantly higher than that from the unaffected pasture. The mean concentration of sulfur in forage from the affected and unaffected pasture was similar and within normal ranges. The mean concentration of sulfur in blood, liver and wool from the affected Guizhou semi-fine wool sheep was significantly lower than that from the unaffected sheep while the content of iron in blood, liver and wool from the affected sheep was significantly higher than that from the unaffected sheep. Oral administration of calcium sulfate prevented and cured the disease. We concluded that the disease of Guizhou semi-fine wool sheep in the Weining County is due to S deficiency caused by the high Fe in forages.
