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Graphene/CNT hybrid effect on Absorption of Mn2+ by Activated Carbon 石墨烯/碳纳米管杂化对活性炭吸附Mn2+的影响
Pub Date : 2019-06-15 DOI: 10.24200/AMECJ.V2.I2.60
A. Ghozatloo, M. Shariaty-Niassar
In this paper we tried to improve the adsorption amount by adding graphene/CNT hybrid in the structure of Activated Carbon (AC) for removing manganese ions from aqueous solutions. The bonding of G/CNT hybrid with activated carbon creates a structure that is an excellent absorbent for removing some heavy metal ions. So the Performance increasing of ion adsorption was compared with AC results as the blank adsorbent. The influence of time, pH solution, initial concentration of Mn2+ and temperature investigated as experimental conditions. The maximum adsorption was 89.38% and 96.18% for  AC and AC/G/CNT composite respectively at 30 min, initial concentration of 30 mg/L, pH=4.5 in 15°C for both adsorbents. The results showed that under the same conditions, the presence of G/CNT hybrid in the structure of AC increased the amount of adsorption by 7.5%  
在本文中,我们试图通过在活性炭(AC)的结构中加入石墨烯/碳纳米管杂化物来提高吸附量,以去除水溶液中的锰离子。G/CNT杂化物与活性炭的结合产生了一种结构,这种结构是去除一些重金属离子的极好吸收剂。比较了活性炭作为空白吸附剂对离子吸附性能的提高效果。考察了时间、pH、初始Mn2+浓度和温度等条件对反应的影响。在初始浓度为30 mg/L、pH=4.5、15℃条件下,AC和AC/G/CNT复合材料在30 min时的最大吸附量分别为89.38%和96.18%。结果表明,在相同条件下,活性炭结构中G/CNT杂化物的存在使吸附量提高了7.5%
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引用次数: 4
Synthesis and performance of graphene and activated carbon composite for absorption of three-valance arsenic from wastewater 石墨烯-活性炭复合材料吸附废水中三价砷的合成及性能研究
Pub Date : 2019-03-23 DOI: 10.24200/AMECJ.V2.I01.53
A. Ghozatloo, A. Zarei, M. Arjomandi
    High levels of arsenic in the effluent are a major concern of human, and the removal of it from the wastewater is hard and costly. The most common techniques for removal of arsenic are membrane separation, ion exchange, oxidation, and coagulation. The active carbon is used as the most common arsenic adsorbent in wastewater treatment processes, this study has been considered as the main adsorbent and attempted to improve its surface properties by graphene nanosheets. Thus, by adding graphene (4.5%w) to the carbon structure, its porosity increases, and the ion exchange behavior and surface load are corrected. In this research, the effects of time process, concentration of arsenic, and adsorbent are evaluated in different pH values. It has been observed that the maximum adsorption of arsenic is 91.8%; in addition, when graphene is used, the rate of absorption of Arsenic has increased about 5.2%, and the process time is shortened.
废水中的高砷含量是人类关注的主要问题,从废水中去除砷既困难又昂贵。除砷最常用的技术有膜分离、离子交换、氧化和混凝。活性炭是废水处理过程中最常用的砷吸附剂,本研究将其作为主要吸附剂,并尝试用石墨烯纳米片改善其表面性能。因此,通过在碳结构中加入石墨烯(4.5%w),其孔隙度增加,离子交换行为和表面负载得到纠正。在不同的pH值下,考察了时间过程、砷浓度和吸附剂的影响。对砷的最大吸附量为91.8%;此外,当使用石墨烯时,砷的吸收率提高了约5.2%,工艺时间缩短。
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引用次数: 2
A new analytical method based on bismuth oxide-fullerene nanoparticles and photocatalytic oxidation technique for toluene removal from workplace air 基于氧化铋-富勒烯纳米颗粒和光催化氧化技术的新分析方法去除工作场所空气中的甲苯
Pub Date : 2019-03-23 DOI: 10.24200/AMECJ.V2.I01.55
C. Jamshidzadeh, H. Shirkhanloo
A new sorbent based on mixture of bismuth oxide-fullerene nanoparticles (Bi2O3-NF) was used for degradation/removal of toluene from workplace and artificial air by UV-photocatalytic oxidation method (UV-PCOM). By set up of  pilot, standard gas of toluene was generated with difference concentrations, and then was passed through UV lamp-glass quartz cell accessory(UV-GQC) by SKC pump at optimized flow rate. Following the UV irradiation, the electrons and holes can undergo redox reactions with toluene on the Bi2O3 surface that lead to the formation of toluene intermediates and toluene. Toluene and intermediates was physically and radically absorbed on the 200 mg of NF at room temperature and then, desorbed from it at 185 OC before determined by GC/FID. In optimized conditions, the adsorption capacity and removal efficiency of NF were obtained 212 mg g-1 and more than 95%, respectively.
采用紫外光催化氧化法(UV-PCOM),研究了新型氧化铋-富勒烯纳米颗粒(Bi2O3-NF)吸附剂对工作场所和人工空气中甲苯的降解和去除效果。通过建立中试装置,产生不同浓度的甲苯标准气体,经SKC泵以最佳流量通过UV-玻璃石英管附件(UV- gqc)。在UV照射下,电子和空穴在Bi2O3表面与甲苯发生氧化还原反应,生成甲苯中间体和甲苯。甲苯和中间体在室温下被200 mg的NF物理吸收,185℃下被解吸,然后用GC/FID测定。在优化条件下,纳滤膜的吸附量为212 mg g-1,去除率为95%以上。
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引用次数: 20
Environmental Health: Evaluation of heavy metals pollution in Isfahan industrial zone from soils, well / eluent waters and waste water by microwave- electro-thermal atomic absorption spectrometry 环境卫生:用微波-电热原子吸收光谱法评价伊斯法罕工业区土壤、井/洗液水和废水中的重金属污染
Pub Date : 2019-03-22 DOI: 10.24200/AMECJ.V2.I01.44
shahnaz Timoori
In this study, soils, well waters, drinking waters, and waste water in the Isfahan industrial area were sampled in spring and summer 2018. In 8 points of industrial zone, important toxic heavy metals such as, lead (Pb), Cobalt (Co), Nickel (Ni), Chromium (Cr), and Cadmium (Cd) were sampled from surface soil (up to 2 m), well/drinking waters and waste water. After sample preparation with micro-wave digestion technique, the concentration of heavy metals was determined by electro-thermal atomic absorption spectrometry (ET-AAS). According to the well water analysis, the mean concentration of Cr, Ni, Co, Cd, and Pb in well water were 95 μg L-1, 146 μg L-1, 185 μg L-1, 12 μg L-1, and 11 μg L-1, respectively. In well water, the concentrations of Cd, Ni, Cr and Co were found much higher than Pb in comparison with the references of World Health Organization (WHO).
本研究于2018年春夏对伊斯法罕工业区的土壤、井水、饮用水和废水进行了采样。在工业区的8个点,从地表土壤(高达2米)、井水/饮用水和废水中取样了铅(Pb)、钴(Co)、镍(Ni)、铬(Cr)和镉(Cd)等重要有毒重金属。微波消解法制备样品后,采用电热原子吸收光谱法测定样品中重金属的浓度。井水分析结果显示,井水中Cr、Ni、Co、Cd、Pb的平均浓度分别为95、146、185、12、11 μ L-1。井水中Cd、Ni、Cr和Co的浓度与世界卫生组织(WHO)的参考值相比,明显高于Pb。
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引用次数: 7
Environmental Health Analysis: Assessing the emission levels of benzene from the fuel tanks doors of the vehicles in Tehran city 环境健康分析:评估德黑兰市车辆油箱门中苯的排放水平
Pub Date : 2019-03-22 DOI: 10.24200/AMECJ.V2.I01.47
A. H. Mirzahosseini
In this study, 350 vehicles in 20 different models were examined in one of Tehran’s Automobile Technical Inspection Centers. The laboratory tests indicate that longtime exposure to benzene has destructive effects on the blood cells, especially the bone-marrow cells. The concentration levels of benzene caused by the emission of gasoline vapors from fuel tanks doors were measured by PhoCheck EX5000 during a 5 to 15-minute interval for each car. The results indicate that the concentration of benzene caused by the emission of gasoline vapors from the fuel tanks door of the domestic cars was 10 times higher than the imported cars. In most of the imported cars, the amount of benzene in the three measured areas was negligible. This is due to the use of new technology and adaptation of strict environmental standards by the manufacturing country.
在这项研究中,在德黑兰的一个汽车技术检查中心检查了20种不同型号的350辆汽车。实验室测试表明,长期接触苯对血细胞,尤其是骨髓细胞有破坏性影响。每辆车每隔5到15分钟,用PhoCheck EX5000测量油箱门排放的汽油蒸气引起的苯浓度水平。结果表明,国产车油箱门排放的汽油蒸气所引起的苯浓度是进口车的10倍。在大多数进口汽车中,三个测量区域的苯含量可以忽略不计。这是由于制造国采用了新技术并适应了严格的环境标准。
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引用次数: 10
Biochemistry Method: Simultaneous determination of formaldehyde and methyl tert-buthyl ether in environmental and human biological matrices using static headspace gas chromatography mass spectrometry 生物化学方法:采用静态顶空气相色谱-质谱法同时测定环境和人体生物基质中的甲醛和甲基叔丁基醚
Pub Date : 2019-03-21 DOI: 10.24200/AMECJ.V2.I01.40
A. M. Beigi, M. Shamsipur
The present study describes a method based on static headspace- extraction (HS) followed by gas chromatography/ mass spectrometry (GC/MS) for the qualitative and quantitative analysis of Methyl tert-buthyl ether (MTBE) and formaldehyde (HCHO) in human blood and water samples. Cytochrome P4502A6 has important role for converting of MTBE to tert-butyl alcohol (TBA) and HCHO. To enhance the extraction capability of the HS, extraction parameters such as extraction temperature, extraction time, the ratio of headspace volume to sample volume and sodium chloride concentration have been optimized.
本文介绍了一种基于静态顶空萃取(HS) -气相色谱/质谱(GC/MS)的人体血液和水样中甲基叔丁基醚(MTBE)和甲醛(HCHO)的定性和定量分析方法。细胞色素P4502A6对MTBE转化为叔丁醇(TBA)和HCHO具有重要作用。为提高萃取效果,对萃取温度、萃取时间、顶空体积比、氯化钠浓度等萃取参数进行了优化。
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引用次数: 8
Spectrofluorometric determination of L-tryptophan after preconcentration using multi-walled carbon nanotubes 多壁碳纳米管预浓缩后荧光光谱法测定l -色氨酸
Pub Date : 2019-03-19 DOI: 10.24200/AMECJ.V2.I01.43
E. Zolfonoun
A solid-phase extraction method based on multi-walled carbon nanotubes (MWCNTs) was applied for the preconcentration of L-tryptophan prior to its spectrofluorometric determination. Due to the high surface area of MWCNTs, satisfactory concentration factor and extraction recovery can be achieved with only 10 mg MWCNTs in 5 min. The effects of pH, sorbent amount, eluent type and time on the recovery of the analyte were investigated. Under the optimum conditions, the detection limit for L-tryptophan was 8.9 ng mL−1. The precision of the method, evaluated as the relative standard deviation obtained by analyzing of 10 replicates, was 2.6%. The practical applicability of the developed method was examined using wheat and barley samples.
采用基于多壁碳纳米管(MWCNTs)的固相萃取法对l -色氨酸进行预富集,然后进行荧光光谱测定。由于MWCNTs的高表面积,仅需10 mg MWCNTs即可在5 min内获得满意的浓度因子和萃取回收率。研究了pH、吸附剂用量、洗脱液类型和时间对分析物回收率的影响。在最佳条件下,l -色氨酸的检出限为8.9 ng mL−1。通过分析10个重复得到的相对标准偏差,该方法的精密度为2.6%。用小麦和大麦样品检验了该方法的实用性。
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引用次数: 11
Air Pollution Method: A new method based on ionic liquid passed on mesoporous silica nanoparticles for removal of manganese dust in the workplace air 空气污染法:离子液体通过介孔二氧化硅纳米颗粒去除工作场所空气中锰尘的新方法
Pub Date : 2019-03-16 DOI: 10.24200/AMECJ.V2.I01.52
Parisa Paydar, A. Zarandi
Chronic effect of manganese exposure to humans caused the dysfunction of nervous system. An applied sorbent based on hydrophobic ionic liquid passed on mesoporous silica nanoparticles was used for adsorption/removal of manganese dust (Mn) from workplace air by solid phase adsorption method. In bench scale set up, 5 mL of standard solution of nitrate and oxide of Mn (0.2-5 mg L-1) was used for generation of manganese dust in pure air by drying procedure, and then was passed through column of IL/MSNPs by SKC pump with flow rate  of 200-500 mL min-1 by SKC pump. The Mn particles separated from column of IL/MSNPs by irrigation of nitric acid solution before determined by F-AAS/ET-AAS. In optimized conditions, the adsorption capacity of MSNPs and IL/MSNPs for Mn removal from air in batch system (1 Li) was obtained 118.5 mg g-1 and 216.2 mg g-1, respectively.
锰对人体的慢性影响可引起神经系统功能障碍。以介孔二氧化硅纳米颗粒为载体,采用疏水离子液体为吸附剂,采用固相吸附法对工作场所空气中的锰尘进行吸附去除。在实验装置中,取硝酸和锰氧化物标准溶液(0.2-5 mg L-1) 5ml在纯空气中干燥生成锰尘,然后用SKC泵通过IL/ msnp柱,流量200-500 mL min-1。硝酸溶液冲洗将Mn颗粒从IL/MSNPs柱中分离出来,然后用F-AAS/ET-AAS测定。在优化条件下,MSNPs和IL/MSNPs的吸附量分别为118.5 mg g-1和216.2 mg g-1。
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引用次数: 10
Review of constructive analytical methods for determining the amount of aluminum in environmental and human biological samples 测定环境和人体生物样品中铝量的建设性分析方法综述
Pub Date : 2019-03-12 DOI: 10.24200/AMECJ.V2.I01.51
F. Hosseini, S. Davari, M. Arjomandi
Aluminum is a toxic metal and causes pollution in soil, water, and air. Afterward, a lot of patients suffer renal failure due to the accumulation of aluminum in the tissues of kidneys. Also, a high concentration of aluminum in plants tissues makes agricultural food toxic. Therefore, measuring aluminum in water, soil, air, human organs, tissues of plants and each food (or agricultural product is so necessary for protecting human health. Also, the effect of some parameters such as pH and temperature on decrease or increase in the amount of aluminum in water and other samples are stated. In this review, the analytical methods such as fluorimetric, ICP-MS, colorimetric, graphite furnace/flame atomic absorption spectrometry, etc. which have been applied for measuring the amount of aluminum (especially   ) in environmental and human biological samples are assesse
铝是一种有毒金属,会对土壤、水和空气造成污染。之后,由于铝在肾脏组织中的积累,许多患者出现肾功能衰竭。此外,植物组织中高浓度的铝会使农业食品有毒。因此,测量水、土壤、空气、人体器官、植物组织和每一种食物(或农产品)中的铝对于保护人类健康是非常必要的。同时,还叙述了pH、温度等参数对水和其他样品中铝含量的增加或减少的影响。本文综述了荧光法、ICP-MS法、比色法、石墨炉/火焰原子吸收光谱法等分析方法在测定环境和人体生物样品中铝(特别是铝)含量方面的应用
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引用次数: 2
Analytical Methods: Electrochemical azido-selenenylation of some olefins by cyclic voltammetry and controlled-potential coulometry 分析方法:用循环伏安法和控制电位库仑法对一些烯烃进行叠氮-硒化反应
Pub Date : 2018-12-18 DOI: 10.24200/AMECJ.V1.I01.38
A. Rouhollahi, Z. Asghari, B. Movassagh
Electrochemical azido-phenylselenenylation of some olefins was studied with the oxidation of diphenyl diselenide in the presence of some olefins and sodium azide in dimethyl formamide containing tetra butyl ammonium perchlorate as supporting electrolyte in an H-type cell. The electrochemical oxidation of the mixture of (PhSe)2, olefins, and NaN3 was studied by cyclic voltammetry and controlled-potential coulometry. Anti product can be obtained with Markovnikov orientation. This product was characterized .by 1H, 13C NMR, and IR spectroscopy.
在含高氯酸四丁基铵的二甲基甲酰胺中,以叠氮化钠和一些烯烃为载体,研究了叠氮化二苯乙烯在叠氮化钠和一些烯烃存在下的电化学叠氮化-苯硒化反应。采用循环伏安法和控制电位库仑法研究了(PhSe)2、烯烃和NaN3混合物的电化学氧化。用马氏取向可以得到反产物。通过1H、13C NMR和IR对产物进行了表征。
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引用次数: 3
期刊
Analytical Methods in Environmental Chemistry Journal
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