نتایج جستجو برای: heavy metal ions

تعداد نتایج: 412588  

Journal: :journal of nanostructures 2016
m. ebadi h. shagholani h. jahangiri

in current work, cds/black carbon nanocomposites were successfully synthesized with the aid of chestnut and cadmium nitrate as the starting reagents. besides, the effects of preparation parameters such as reaction time, and precursor concentration on the morphology of products and removal of heavy metals (hg+2, pb+2) were studied by scanning electron microscopy images and batch adsorption mode....

ابوالحسن‌نژاد, وحیده, ثابت جهرمی, محمد جواد, صالحی‌زاده, محمد, قطبی راوندی, محمدرضا, مهربانی, میترا, نخعی امرودی, نوذر,

  Background and Aim: Breathing exposure to cement dust containing an amount of heavy metal compounds has many different local and systemic effects. The aim of the present study was to survey the extent of cement factory workers' pulmonary exposure to metal ions (Cadmium, Cobalt, Chromium and Nickel).   Materials and Methods: In this cross-sectional research, environmental sampling of the fa...

Journal: :پژوهش های علوم و صنایع غذایی ایران 0
mostafa shahidi noghabi s.mohammad ali razavi s.mahmud mousavi mohammad elahi

removing of ions from different water and waste water is one of the most important of nanofiltration potential for different aims, such as softening of potable water, remove of heavy metal ions and purification of waste water to reuse. in this study nanofiltration was used to remove of the most important ions (na+, k+, ca2+, mg2+, so42-, cl-) in sugar beet press water to reuse of this stream. e...

Journal: :Dalton transactions 2013
Li-Kun Zhang Ling-Bao Xing Bin Chen Qing-Zheng Yang Qing-Xiao Tong Li-Zhu Wu Chen-Ho Tung

A novel luminescent Zn(2+) ions chemosensor, a cyclometalated platinum(II) bipyridyl acetylide complex, was designed. Of particular significance is that it shows a high sensitivity towards Zn(2+) ions without interference from other biologically important cations in acetonitrile. The tautomerization of amide favors detecting Zn(2+) ions among other HTM (heavy and transition metal) ions in aqueo...

2017
Mahesh Sundararajan

Understanding the speciation and binding of heavy metal ions in different environments is central to nuclear waste management processes. Due to the obvious safety and health hazard in experimental studies, theoretical calculations can be used as an alternative tool to study the chemistry of toxic heavy metal ions. Although several quantum chemical methods with variable accuracy are available, a...

2013
Yilong Wang Song Liang Bingdi Chen Fangfang Guo Shuili Yu Yulin Tang

The synergistic adsorption of heavy metal ions and humic acid can be very challenging. This is largely because of their competitive adsorption onto most adsorbent materials. Hierarchically structured composites containing polyethylenimine-modified magnetic mesoporous silica and graphene oxide (MMSP-GO) were here prepared to address this. Magnetic mesoporous silica microspheres were synthesized ...

2009
G. Popescu Gabriela Popescu

Heavy metal pollution represents an important environmental problem due to the toxic effects of metals. Their accumulation throughout the food chain leads to serious ecological and health problems. The remediation of environments metal contaminated through physico-chemical methods present major disadvantages such as high energy consumption, high costs and incomplete removal of metal ions. Bioso...

2016
Meenakshi Sati Megha Verma G. B. Pant

Environmental contamination by heavy metals is a serious problem due to their incremental accumulation in the food chain. Unlike most organic wastes and the microbial load in aquatic bodies, metal contaminants are not biodegradable, tending to accumulate in living organisms, thus becoming a permanent burden on ecosystems (Bayo, 2012). Most heavy metals are transition elements with incompletely ...

2002
Bastiaan P. Krom Henry Huttinga Jessica B. Warner Juke S. Lolkema

Bacillus subtilis possesses a secondary transporter CitM that is specific for the complex of citrate and Mg but is also capable of transporting citrate in complex with the heavy metal ions Zn, Ni and Co. We report on the impact of CitM activity on the toxicity of the heavy metals Zn, Ni and Co + in B. subtilis. In a CitM deletion mutant or under conditions when CitM is not expressed, the toxic ...

2015
Holden T. Maecker Alexandre Harari

Description of the technology Flow cytometry traditionally uses fluorochrome-labeled probes, such as antibodies, to identify cells expressing the targets of those probes. A sample stream carries single cells in suspension past a laser, exciting the fluorochromes, with quantitation of the emitted fluorescent signals from each cell via optical filters and photomultiplier tubes [1]. In mass cytome...

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