نتایج جستجو برای: ‎ Adsorption

تعداد نتایج: 54602  

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 the iranian chemical research 0
ardeshir shokrollahi department of chemistry, university yasouj, 75918-74831, yasouj, iran mehrourang ghaedi department of chemistry, university yasouj, 75918-74831, yasouj, iran mojdeh ranjbar department of chemistry, university yasouj, 75918-74831, yasouj, iran ameneh alizadeh department of chemistry, university yasouj, 75918-74831, yasouj, iran

the objective of this study was to assess the adsorption potential of activated carbon (ac) asan adsorbent for the removal of murexide (mu) from aqueous solutions. the influence of variablesparameters including ph, amount of adsorbent, sieve size of adsorbent, temperature and contact timeon mu removal was studied. following optimization of variables, the relation between concentrations ofdye re...

2009
BORIVOJ ADNADJEVIĆ NATAŠA LAZAREVIĆ JELENA JOVANOVIĆ

The isothermal adsorption of nicotine from an aqueous solution onto zeolite type USY at temperature range from 298 to 322 K was investigated. It was found that the adsorption isotherms can be described by the Freundlich adsorption isotherm. The density distribution function of adsorption centers has an exponential form and the adsorption isotherms can be fitted by the Freundlich isotherm. The c...

Journal: :jentashapir journal of health research 0
mansooreh dehghani department of environmental health, research center for health sciences, school of health, shiraz university of medical sciences, shiraz, ir iran samaneh shahsavani department of environmental health engineering, school of health, student research committee, shiraz university of medical sciences, shiraz, ir iran; department of environmental health engineering, school of health, student research committee, shiraz university of medical sciences, shiraz, ir iran. tel: +98-9385322369, fax: +98-7137260225 narges shamsedini department of environmental health engineering, school of health, student research committee, shiraz university of medical sciences, shiraz, ir iran mohammad reza javaheri department of environmental health engineering, school of health, student research committee, shiraz university of medical sciences, shiraz, ir iran

conclusions it was shown that the removal efficiency of nitrate was directly proportional to the amount of chaff, temperature, and contact time but inversely to the ph. this study showed that nitrate removal by chaff is a promising technique. results the result of this study revealed that chaff as an absorbent could remove nitrate from solutions, and the efficiency of adsorption increased as co...

Journal: :تحقیقات نظام سلامت 0
محمد ملکوتیان استاد، مرکز تحقیقات مهندسی بهداشت محیط و گروه بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی کرمان، کرمان، ایران مرضیه جاودان دانشجوی کارشناسی ارشد، مرکز تحقیقات مهندسی بهداشت محیط و گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی کرمان، کرمان، ایران فرناز ایرانمنش مرکز تحقیقات مهندسی بهداشت محیط، دانشگاه علوم پزشکی کرمان، کرمان، ایران

background: as fluoride concentration in drinking water is one of the effective parameters in human health, finding the ways to remove excess amount of fluoride is very important in water supply projects. this study aimed to evaluate mendon bauxite mine in the removal of fluoride from drinking water. methods: this experimental study was conducted from may to october 2013 on synthetic and actual...

2013
Mahshid Rahimi Jayant K. Singh Deepu J. Babu Jörg J. Schneider Florian Müller-Plathe

Grand-canonical Monte Carlo simulations and adsorption experiments are conducted to understand the adsorption of CO2 onto bundles of 3D aligned double-walled carbon-nanotubes of diameter 5 nm at 303 K. The simulation of partial adsorption isotherms, i.e., only inner tube volume, only interstices between tubes, and unrestricted, allows a breakdown of the experimental adsorption isotherms into co...

Journal: :journal of agricultural science and technology 2015
m. r. rigi m. farahbakhsh k. rezaei

in this study, the batch equilibrium method was used to conduct metribuzin adsorption/desorption experiments with eight soils from different regions of iran. the results indicated that the organic carbon (oc) content, clay content, cation exchange capacity (cec), and ph had a combined effect on the metribuzin adsorption on soil. under the experimental conditions, the adsorption amount of metrib...

2016
Takaaki Wajima

The present study examined the adsorption of silver ion in aqueous solution onto natural clinoptilolite zeolite from Futatsui Mine, Akita Prefecture, Japan. The effects of various parameters, i.e., solution pH, adsorbent dosage, adsorption time, silver ion solution concentration, and temperature, on silver ion adsorption process onto clinoptilolite were examined. Additionally, the thermodynamic...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2016
Jong-Hwan Park Seong-Heon Kim Se-Won Kang Byung-Hwa Kang Ju-Sik Cho Jong-Soo Heo Ronald D Delaune Yong Sik Ok Dong-Cheol Seo

Adsorption characteristics of potentially toxic metals in single- and multi-metal forms onto ferronickel slag were evaluated. Competitive sorption of metals by ferronickel slag has never been reported previously. The maximum adsorption capacities of toxic metals on ferronickel were in the order of Cd (10.2 mg g(-1)) > Cu (8.4 mg g(-1)) > Zn (4.4 mg g(-1)) in the single-metal adsorption isotherm...

Journal: :Journal of the American Chemical Society 2005
Kwanyong Seo Kyung Ah Park Changwook Kim Seungwu Han Bongsoo Kim Young Hee Lee

We report the density-functional calculations of NO2 adsorption on single-walled carbon nanotube walls. A single molecular adsorption was endothermic with an activation barrier, but a collective adsorption with several molecules became exothermic without an activation barrier. We find that NO2 adsorption is strongly electronic structure- and strain-dependent. The NO2 adsorption on metallic nano...

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