نتایج جستجو برای: Heavy metal ions

تعداد نتایج: 412588  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سمنان - دانشکده مهندسی موادو متالورژی 1393

the aim of this paper is eliminating cr(vi) by natural hap. hap is a inexpensive material which is used from bovine critical bone ash in order to remove heavy metal ions like cr(vi). some experiments in different ph are performed (ph=2,3,7). maximum adsorption was appeared at ph=2, dosage=0.3 gr, c0=10 mg/l. cr(vi) removal depends on ph value and initial amount of cr(vi) result of experiments w...

Journal: :journal of particle science & technology 2015
mohsen mehdipour ghazi milad mohammadi hamid modarres

in present study, molecular dynamics simulation of cadmium (ii), lead (ii) and copper (ii) removal from aqueous electrolyte solutions using the ion-exchange process with the zeolite particles was done. the results showed that, most of the particles had the highest affinity of ion exchanging with lead (ii) and the lowest affinity with copper (ii). the calculated mean ion-exchange ratios showed t...

Journal: :journal of advanced materials and processing 0
hadi baseri damghan university, damghan, iran saeed tizro damghan university, damghan. iran

co-precipitation procedure was applied in order to obtain different kinds of magnetic nanoadsobents for the removal of pb(ii) and cu(ii) toxic metal ions from wastewater samples. prepared nanoadsorbents were characterized by fourier transform infrared spectroscopy (ft-ir), x-ray diffractometer (xrd), scanning electron microscopy (sem) and thermogravimetric analysis (tga). the average sizes of t...

Journal: :international journal of nano dimension 0
hamidreza sadegh department of chemistry, science and research branch, islamic azad university, tehran, iran. ramin shahryari ghoshekandi department of chemistry, science and research branch, islamic azad university, tehran, iran. ali masjedi department of chemistry, science and research branch, islamic azad university, tehran, iran. zahra mahmoodi department of chemistry, science and research branch, islamic azad university, tehran, iran. maryam kazemi department of chemistry, payame noor university, zanjan, iran.

carbon nanotubes (cnts) are a novel material that exhibits good adsorption behavior toward various toxic pollutants in aqueous solution. these adsorbents have a fast adsorption rate and high adsorption efficiency, efficient to remove various pollutants and they are easy to recover and reuse. these features highlight the suitability of cnts for the treatment of water polluted with heavy metal io...

Journal: :caspian journal of environmental sciences 2011
al. et sh. shahmohammadi-kalalagh

the feasibility of kaolinite used as a low-cost adsorbent for the removal of pb(ii), zn(ii) and cu(ii) from aqueous solutions was investigated. during the removal process, batch technique was used, and the effects of heavy metal concentration and contact time on adsorption efficiency at ph of 4.5, under a constant temperature of 20?1 ?c were studied. the experimental results were analyzed using...

Journal: :international journal of environmental research 0
p.c. mane school of earth sciences, swami ramanand teerth marathwada university, nanded, maharashtra, 431606, india a.b. bhosle school of earth sciences, swami ramanand teerth marathwada university, nanded, maharashtra, 431606, india

algae have been proven efficient biological vectors for heavy metal uptake. in order to further study their biosorption potential, two strains spirogyra sp. and spirulina sp. have been studied under different initial metal concentrations. in recent years, the biosorption processes have been studied extensively using microbial biomass as biosorbent for heavy metal ions removal. in these studies,...

Journal: :international journal of environmental research 2012
p.c. mane a.b. bhosle

algae have been proven efficient biological vectors for heavy metal uptake. in order to further study their biosorption potential, two strains spirogyra sp. and spirulina sp. have been studied under different initial metal concentrations. in recent years, the biosorption processes have been studied extensively using microbial biomass as biosorbent for heavy metal ions removal. in these studies...

Journal: :journal of chemical health risks 0
m. ghaedi department of chemistry, graduate student, firuz abad branch, islamic azad university, fars, iran n. mosallanejad department of chemistry, graduate student, firuz abad branch, islamic azad university, fars, iran

adsorption is a fundamental process in the physicochemical treatment of wastewaters which industries employ to reduce hazardous organic and inorganic wastes in effluents. in recent years the use of low-cost adsorbents has been widely investigated as a replacement for the currently costly methods of removing heavy metal ions from wastewater. it is well-known that cellulosic waste materials can b...

2003
D. Ropek A. Para

Heavy metal ions are harmful for entomopathogenic fungi. Derivatives of starch dialdehyde such as dihydrazone (DHZ), dithiosemicarbazone (DTSC), and dioxime (DOX) were used to form water-insoluble complexes with heavy metal ions. This phenomenon thus provided protection of entomopathogenic fungus Paecilomyces farinosus from the toxic effects of heavy metal ions. The fungus growth and the sporul...

2011
Yap Wing Fen W. Mahmood Mat Yunus

The aim of this research is to characterize the optical properties of heavy metal ions (Hg, Cu, Pb and Zn) using surface plasmon resonance (SPR) technique. Glass cover slips, used as substrates were coated with a 50 nm gold film using sputter coater. The measurement was carried out at room temperature using Kretchmann SPR technique. When the air medium outside the gold film is changed to heavy ...

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