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1.
Scrubbing of NO
x
from the gas phase with Fe(II)EDTA has been shown to be highly effective. A new biological method can be used to convert
NO to N2 and regenerate the chelating agent Fe(II)EDTA for continuous NO absorption. The core of this biological regeneration is how
to effectively simultaneous reduce Fe(III)EDTA and Fe(II)EDTA-NO, two mainly products in the ferrous chelate absorption solution.
The biological reduction rate of Fe(III)EDTA plays a main role for the NO
x
removal efficiency. In this paper, a bacterial strain identified asKlebsiella Trevisan sp. was used to demonstrate an inhibition of Fe(III)EDTA reduction in the presence of Fe(II)EDTA-NO. The competitive inhibition
experiments indicted that Fe(II)EDTA-NO inhibited not only the growth rate of the iron-reduction bacterial strain but also
the Fe(III)EDTA reduction rate. Cell growth rate and Fe(III)EDTA reduction rate decreased with increasing Fe(II)EDTA-NO concentration
in the solution.
Project (No. 20176052) supported by the National Natural Science Foundation of China and the Scientific Research Foundation
for Returned Overseas Chinese Scholars, Ministry of Education 相似文献
2.
Ferrous chelate absorption is deemed a promising method for NO removal from flue gas, but the key problem is the difficulty to regenerate the absorption solution, i.e. the complexes of FeⅡ(EDTA)NO and FeⅢ(EDTA) in the solution. Two bacterial strains isolated recently from the sludge of the denitrification step of a municipal wastewater treatment plant could be applied effectively to regenerate the absorbent were Pseudomonas sp. and klebsiella trevisan sp. Pseudomonas sp. exhibited high reduction ability on FeⅡ(EDTA)NO and the klebsiella trevisan sp. was more suitable for FeⅢ(EDTA) reduction. 相似文献
3.
INTRODUCTIONThecombustionoffossilfuelsgeneratesSO2andNOxpollutantscausingairpollutionandacidrain.Existingfluegasdesulfurization(FGD)scru-bbersareefficientforcontrollingSO2emission,butareincapableofremovingwater-insolublenitricoxide.WeandotherresearcheshadreportedtheuseofmetalchelateadditivesinFGDsystemsforcom-binedremovalofNOxandSO2(Shietal.,1996a;1996b;1996c;1997;LittlejohnandChang,1990;Tsaietal.,1989;Harriottetal.,1993).FeII(EDTA,ethylenediaminetetraacetate)isoneofthemostprom… 相似文献
4.
以水杨酸、8－羟基喹啉为配体与铁（Ⅲ）合成了一种新型未见文献报道的三元配合物,用元素分析、热重差热分析、红外光谱、紫外可见光谱等手段对其进行表征,确定其化学组成为[Fe（C7H5O3）2（C9H6NO）]。水杨酸脱质子以酸根形式与Fe（Ⅲ）离子成键,酚羟基不参与配位,而8－羟基喹啉以酚羟基氧和杂环上的氮原子双齿配位,形成五元螯环。采用分光光度法研究其对大肠杆菌生长的作用,并绘出其生长曲线,发现配合物浓度低于2 mmol· L^－1时,促进大肠杆菌的生长,高于2 mmol· L^－1时抑制其生长,浓度越大抑制作用越强,即配合物对大肠杆菌的生长具有双向生物效应。 相似文献
5.
As industrial pollutants , NOx( mainly nitric oxide(NO) and nitric dioxide (NO2)) are generated mainlyfromcombustion and cause a series of environmental problems ,such as acidrain,photochemical smog,and greenhouse ef-fects. Either indoor or outdoor concen… 相似文献
6.
1, 10-Phenanthroline (phen) was tested as a complexing agent for on-line preconcentration of iron on RP-C18 material in a microcolumn with flow injection coupled with flame atomic absorption spectrometer (FI-FAAS). The on-line formed
Fe(II)-phen complexes were adsorbed on the C18 sorbent material. Various parameters affecting the on-line Fe(II)-phen complex formation and its subsequent adsorption in
the microcolumn as well as its elution into the nebulizer of AAS were optimized. A 2.5×10−3 mol/L phen in 2% through the microcolumn for 30 s. The adsorbed Fe(II)-phen complexes in the microcolumn were eluted with
ethanol in 10 s into the nebulizer of AAS. Ascorbic acid (5×10−4 mol/L) was added to the sample solution for the reduction of Fe(III) to Fe(II). A good precision (RSD=1.1%,n=10), high enrichment factor (19) and sample throughput (90 h−1) with detection limit (3σ) of 3 μg/L were obtained. The method was applied on standard reference materials (i. e. mussel
and tomato leaves,) for iron determination and yielded results agreeing well with certified values.
Project supported by the Zhejiang Provincial Natural Science Foundation of China and Zhejiang Environmental Protection Foundation
From Pakistan Institute of Nuclear Science & Technology, Islamabad, Pakistan and now ZJ University, Ph. D. student. 相似文献
7.
利用VC的还原性,将Fe3+定量转化为Fe2+离子,产生的Fe2+与邻菲哆啉形成橘红色络合物,从而间接测定VC的含量。结果表明,络合物在510nm处有最大吸收峰,且显色物的浓度在2.0×10-6-5.0×10-5mol/L范围内与吸光度成正比,其相关系数R为0.9936,检出限为2.0×10-6mol/L,被测定样品的... 相似文献
8.
The objective of the present study was to compare the toxicity and availability of Fe(II) and Fe(III) to Caco-2 cells. Cellular
damage was studied by measuring cell proliferation and lactate dehydrogenase (LDH) release. The activities of two major antioxidative
enzymes [superoxide dismutase (SOD) and glutathione peroxidase (GPx)] and differentiation marker (alkaline phosphatase) were
determined after the cells were exposed to different levels of iron salts. The cellular iron concentration was investigated
to evaluate iron bioavailability. The results show that iron uptake of the cells treated with Fe(II) is significantly higher
than that of the cells treated with Fe(III) (P<0.05). Fe(II) at a concentration >1.5 mmol/L was found to be more effective in reducing cellular viability than Fe(III).
LDH release investigation suggests that Fe(II) can reduce stability of the cell membrane. The activities of SOD and GPx of
the cells treated with Fe(II) were higher than those of the cells treated with Fe(III), although both of them increased with
raising iron supply levels. The results indicate that both Fe(II) and Fe(III) could reduce the cellular antioxidase gene expression
at high levels.
Project supported by the International Cooperative Project from the Ministry of Science and Technology of China (No. 2006DFA31030),
the Bureau of Science and Technology of Zhejiang Province (No. 2006C32019) and HarvestPlus-China (No. 8022), and the Program
for Changjiang Scholars and Innovative Research Team in University of China (No. IRT0536) 相似文献
9.
CHEN Jian ming ZHANG Jian cheng SHEN Yue LIU Xiu hong YANG Lin hong School of Material Science Engineering Shanghai University Shanghai China 《上海大学学报(英文版)》2001,(2)
1 Ｉｎｔｒｏｄｕｃｔｉｏｎ Ｒｅｃｅｎｔｌｙｐｈｔｈａｌｏｃｙａｎｉｎｅｓ (Ｐｃｓ)ａｓｏｒｇａｎｉｃｓｅｍｉｃｏｎ ｄｕｃｔｏｒｓｈａｖｅａｔｔｒａｃｔｅｄｍｏｒｅａｔｔｅｎｔｉｏｎｂｅｃａｕｓｅｔｈｅｙａｒｅｖｅｒｙｓｔａｂｌｅ .Ｐｃｓ ｐｏｓｓｅｓｓｂｅｔｔｅｒ ｐｈｏｔｏｅｌｅｃｔｒｉｃａｌｐｒｏｐｅｒｔｉｅｓａｎｄｈｉｇｈｌｙａｂｓｏｒｐｔｉｏｎｉｎｔｈｅｖｉｓｉｂｌｅｌｉｇｈｔｒｅ ｇｉｏｎ .ＳｏｍｅｐｒｏｐｅｒｔｉｅｓｏｆＰｃｓｃａｎｂｅｉｍｐｒｏｖｅｄａｌｏｔｂｙｂｏｎｄｉｎｇｔｏｐ… 相似文献
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利用琼脂糖（agarose）将过氧化氢酶（Cat）固定在热裂解石墨电极表面,制备Cat—agarose膜修饰电极．包埋在琼脂糖中妁过氧化氢酶与电极直接传递电子,在pH6．0的缓冲溶液中可得一对可逆的氧化还原峰,式电势为-0．343V（vs SCE）,这是过氧化氢酶辅基血红素Fe（Ⅲ）／Fe（Ⅱ）电对的氧化还原．其式电势随溶液的pH值增加而负移且成线性关系,直线斜率为-36．8mV／pH,说明过氧化氢酶的电子传递过程伴随有质子的转移．过氧化氢酶修饰电极．在16．5—278μmol／L的范围内,催化电流与过氧化氢浓度成线性关系． 相似文献
12.
Fe (III)-catalyzed ozonation yielded better degradation rate and extent of COD (Chemical Oxygen Demand) or oxalic acid as
compared with oxidation by ozone alone. Two parameters with strong effects on the efficiency of ozonation are pH of the solution
and the catalyst (Fe3+) dosage. The existence of a critical pH value determining the catalysis of Fe (III) in acid conditions was observed in phenol
and oxalic acid systems. The best efficiency of catalysis was obtained at a moderate concentration of the catalyst. A reasonable
mechanism of Fe (III)-catalyzed ozonation of phenol was obtained based on the results and literature.
Project (No. [2003]-AM10: 15) supported by Sino-Finnish Scientific and Technological Cooperation Project 相似文献
13.
CHENJian－ming ZHANGJian－cheng 《上海大学学报(英文版)》2001,5(2):156-159
Fe(Ⅲ)-2,9,16,23-tertracarboxy-phthalocyanine(Fe(Ⅲ)-taPc)was synthesized.and bonded to polystyrene(PS) with covalence by Friedel-Crafts reaction to form a new polymer(Fe(Ⅲ)-tapC-PS) (polymer(II)),UV-VIS and Infrared spectra indicated that Fe(Ⅲ)-taPc was successfully bonded to PS.A photoreceptor device of sandwich structure consisting of alternate layers of poly-mer(II)and fullerene(C60) was prepared.The experiment results show that the photoconductivity of the photoreceptor is higher than that of the single-layer film of polymer(II) or C60,because of the charge-transfer effect between the layers. 相似文献
14.
研究UV254光照下,Fe(Ⅲ)-EDTA/H2O2对苯酚的催化光降解效能。首先考察反应时间、溶液初始pH值、Fe(Ⅲ)与EDTA的浓度比值对UV/Fe(Ⅲ)-EDTA催化光降解苯酚的影响,进而考察UV/Fe(Ⅲ)-EDTA/H2O2体系对苯酚的降解效能。结果表明:当溶液pH为7,Fe(Ⅲ)/EDTA浓度比值为1:1时,经过1h反应,UV/Fe(Ⅲ)-EDTA体系对苯酚的催化光降解效率达61.13%。在溶液初始pH为37时,UV/Fe(Ⅲ)-EDTA对苯酚的降解率均可达60%以上。在中性条件下,UV/Fe(Ⅲ)-EDTA体系添加H2O2后可把苯酚的降解率从61.13%提高到91.30%。反应前后溶液的紫外扫描光谱表明光降解过程中苯酚的苯环共轭结构被破坏。最后对UV/Fe(Ⅲ)-EDTA/H2O2体系催化光降解机理进行了初步探讨。 相似文献
15.
采用紫外-可见光谱、荧光光谱、同步荧光光谱和圆二色(CD)光谱等方法研究了人血红蛋白与亚硝酸钠配位反应的光谱学性质。结果表明:血红蛋白与亚硝酸钠配位反应的进行受血红素中心铁原子价态的影响。高铁血红蛋白与亚硝酸钠发生配位反应生成Hb(III)-NaNO2;亚铁血红蛋白与亚硝酸钠反应生成Hb(II)-NaNO2。但是随着时间的推移,Hb(II)-NaNO2配合物逐渐解离,解离出的亚铁血红蛋白逐渐被氧化成高铁血红蛋白,溶液中的亚硝酸钠再与高铁血红蛋白反应,最终生成Hb(III)-NaNO2配合物。此外,荧光光谱、同步荧光光谱和CD数据显示亚硝酸钠的加入改变了血红蛋白氨基酸残基的微环境,且作用点更接近于色氨酸残基位置,而对蛋白质二级结构影响甚微。 相似文献
16.
根据不同振幅动荷载的三组蠕变试验结果,比较了冻结粉土在不同动荷载作用下的蠕变变形和动蠕变强度特征,发现,当动荷载振动幅值不同时,动蠕变曲线变化规律以及动蠕变强度特征变化规律都相似,但数值上有较大差别;在相同静荷载基础上叠加不同振幅动荷载时,在整个蠕变过程中,振幅越大,变形越大。而对于卸载到零的动荷载试验来说,初始蠕变阶段和稳定蠕变阶段的变形较小,但由于蠕变速率很大,变形迅速增加,很快进入渐进流阶段,随后变形变得很大;冻土的动蠕变强度随时间有规律地衰减;动荷载的振幅越大,破坏时间越短,土体越容易发生破坏。 相似文献
17.
为探究配体维生素B3(C6H5NO2)、8-羟基喹啉(C9H7NO)及其稀土配合物[RE(C6H4NO2)2(C9H6NO)].2H2O(RE=La、Nd、Sm)对红酵母生物活性的影响,本实验采用平板培养皿法和抑菌圈法测定了上述三元配合物及其配体对野生红酵母和实验红酵母生长活性的影响通过比较分析抑菌圈直径的大小,我们发现8-羟基喹啉(C9H7NO)对红酵母抑制作用较强,而维生素B3没有抑制作用,与稀土(RE=La、Nd、Sm)形成三元配合物后,Sm的三元配合物抑菌能力得到了加强,而Nd和La的三元配合物抑菌能力减弱初步推测Sm配合物可应用于红酵母危害的防治 相似文献
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王丽琼 《泉州师范学院学报》2012,30(6):63-66
基于1999-2008年中国氮氧化物排放量和经济发展数据,构建了30个省区万元产值氮氧化物排放量随人均GDP变化的环境学习曲线.以所建立的环境学习曲线为依据,预测了2020年氮氧化物排放强度和减排潜力,并计算各省区氮氧化物削减目标和分担率. 相似文献
20.
以FeSO4为原料,在添加剂EDTA(乙二胺四乙酸二钠盐)存在下,氧气氧化Fe(OH)2可直接生成纯相非晶δ-FeOOH.研究了EDTA浓度、初始pH对δ-FeOOH形成的影响.使用TEM、IR对产物进行了表征,并讨论了在EDTA作用下的氧气氧化Fe2 的反应机理. 相似文献