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Majid Arvand Elahe Bozorgzadeh Shahab Shariati Mohammad Ali Zanjanchi 《Environmental monitoring and assessment》2012,184(12):7597-7605
Spectrophotometry in combination with ionic liquid-based dispersive liquid–liquid microextraction (DLLME) was applied for the extraction and determination of formaldehyde in real samples. The method is based on the reaction of formaldehyde with methyl acetoacetate in the presence of ammonia. The variation in the absorbance of the reaction product was measured at 375?nm. An appropriate mixture of ethanol (disperser solvent) and ionic liquid, 1-hexyl-3-methylimidazoliumhexafluoro-phosphate [C6MIM][PF6] (extraction solvent) was rapidly injected into a water sample containing formaldehyde. After extraction, sedimented phase was analyzed by spectrophotometry. Under the optimum conditions, the calibration graph was linear in the range of 0.1–20?ng?mL?1 with the detection limit of 0.02?ng?mL?1 and limit of quantification of 0.08?ng?mL?1 for formaldehyde. The relative standard deviation (RSD%, n?=?5) for the extraction and determination of 0.8?ng?mL?1 of formaldehyde in the aqueous samples was 2.5%. The results showed that DLLME is a very simple, rapid, sensitive, and efficient analytical method for the determination of trace amounts of formaldehyde in wastewaters and detergents, and suitable results were obtained. 相似文献
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采用化学共沉淀法将镍铁氧体(NiFe2O4)负载到活性炭,制备出一种磁性吸附剂镍铁氧体@活性炭(NiFe2O4@AC),并将其用于吸附废水中的Cr(Ⅵ).研究了吸附剂吸附Cr(Ⅵ)的影响因素、吸附动力学和吸附等温线.结果表明,在温度为25℃、 pH为2、 Cr(Ⅵ)初始浓度为150 mg·L-1、活性炭投加量为0.1 g、吸附时间为720 min时,NiFe2O4@AC吸附Cr(Ⅵ)的去除率达到96.92%,吸附量达到72.62 mg·g-1.实验数据符合准二级动力学和Langmuir模型,表明其吸附过程是一个单层的化学吸附过程.热力学研究证实,温度升高有利于Cr(Ⅵ)在NiFe2O4@AC上的吸附,该吸附过程是自发和吸热反应.NiFe2O4@AC吸附机制主要是通过络合作用和静电吸引来吸附Cr(Ⅵ),同时,外加磁场可从溶液中分... 相似文献
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Heidarpour Mojtaba Movahed Saeed Ostad Jourabchi Shahab 《Journal of Polymers and the Environment》2021,29(10):3130-3144
Journal of Polymers and the Environment - The separation of an individual plastic from a plastics mix is crucial in plastic recycling management. The selected plastics available in municipal and... 相似文献
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Zhang Zhaomin Bashir Tadadus Song Jiaxuan Aziz Shahab Yahya Ghulam Bashir Sana Zamir Aysha 《Environmental science and pollution research international》2022,29(1):405-416
Environmental Science and Pollution Research - South Asia is a hub for encompassing air contamination, with 37 of the top tiers of the 40 most contaminated urban communities around the globe... 相似文献
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Hoseini Hamideh Ostad Movahed Saeed Jourabchi Shahab 《Journal of Polymers and the Environment》2022,30(7):2824-2836
Journal of Polymers and the Environment - The influential separation of an individual plastic from a mixture of waste plastics is a crucial factor for the quality evaluation of the recycled... 相似文献
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The relevance of economic freedom for energy,environment, and economic growth in Asia-Pacific region
Mahmood Muhammad Tariq Shahab Sadaf Shahbaz Muhammad 《Environmental science and pollution research international》2022,29(4):5396-5405
Environmental Science and Pollution Research - This paper investigates the relationship between energy intensity, economic freedom, and carbon emissions. The problem of environmental degradation,... 相似文献
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