نتایج جستجو برای: an increase in ionic strength strongly stimulated b adsorption

تعداد نتایج: 17938347  

Journal: :تحقیقات آب و خاک ایران 0
عزیز مجیدی دانشجوی سابق دکتری دانشکدة کشاورزی دانشگاه تربیت مدرس رسول راهنمایی استادیار دانشکدة کشاورزی دانشگاه تربیت مدرس محمد جعفر ملکوتی استاد دانشکدة کشاورزی دانشگاه تربیت مدرس

the role of calcite as related to the chemical behavior of boron (b) in calcareous soils was investigated through an assessment of b adsorption and desorption reactions on and from calcite in four ratios of solid to solution rate, three levels of ionic strength, and within a ph range of 7.5 to 11.5. experimental data indicated that b adsorption is increased by an increase in the solid to soluti...

Journal: :پژوهش های خاک 0
مریم آقایی دانش آموخته کارشناسی ارشد دانشگاه تربیت مدرس رسول راهنمایی استادیار دانشگاه تربیت مدرس

plants uptake boron (b) from the soil solution, in which boron concentration is controlled by adsorption and desorption reactions on soil organic and inorganic colloids. considering the importance of aluminosilicate minerals in ion adsorption and desorption reactions in soil, in this research, b adsorption behavior on kaolinite was studied as a function of equilibrium concentration, ph, kaolini...

Journal: :آب و خاک 0
مجتبی مقبلی محسن فرحبخش ناصر برومند

introduction: boron (b) is an essential plant micronutrient whose soil availability is influenced by many soil factors.understanding the processes controling activity of boron (b) in the soil solution is important for soil fertility management. the reaction of adsorption and desorption of boron in soil determines the amount of boron that is available to plants. adsorption–desorption processes p...

Journal: :Journal of colloid and interface science 2005
Sabine Goldberg

Understanding anion adsorption mechanisms is necessary to allow prediction of anion adsorption behavior. This study was conducted to evaluate the ability of the triple layer model, a chemical surface complexation model, to describe the effect of changes in solution ionic strength (0.01-1.0 M NaCl) and solution pH (3-11) on B adsorption by the iron oxide, goethite, the aluminum oxide, gibbsite, ...

2002
Sabine Goldberg

Prediction of anion adsorption behavior is enhanced by understanding the adsorption mechanism. This study was conducted to evaluate ionic strength effects on B adsorption and to infer B adsorption mechanisms on various surfaces. Boron adsorption on the Fe oxide goethite, the Al oxide gibbsite, the clay minerals kaolinite and montmorillonite, and two arid-zone soils was investigated as a functio...

2009
Stanisław Chibowski Elżbieta Grządka Jacek Patkowski

The influence of ionic strength and the molecular weight of polyacrylic acid (PAA) on its adsorption and the structure of adsorbed polymer layer on SiO2 surface in the presence NaCl and CaCl2 was measured. Thickness of PAA adsorption layers on the SiO2 surface in these two electrolytes were also measured as well as the expansion coefficient (α) of PAA in CaCl2. The increase of: ionic strength, ...

شکوهی, رضا , صمدی, محمد تقی, طرلانی آذر, منیره, عراقچیان, ملیحه,

Background and purpose: Continuous input of antibiotics to the environment causes many problems such as antibiotic resistance in pathogenic microorganisms. Therefore, researchers are aiming to find solutions to reduce antibiotics in hospital effluents and polluted waters. Amoxicillin is an antibiotic which is widely used to treat infections. Due to inappropriate use it enters the wastewater and...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1390

cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...

2003
R. D. KULKARNI P. SOMASUNDARAN

Oleate flotation characteristics of hematite have been investigated in thjs study under a wide range of experimental conditions of pH, temperature, ionic strength and collector concentration. The study revealed the following major features of this system which include: (a) a maximum in floatability in the neutral pH range; (b) an increase in the flotation response of hematite with increase eith...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2007
Yael G Mishael Paul L Dubin Renko de Vries A Basak Kayitmazer

The adsorption of quaternized poly(vinylpyridine) (QPVP) on controlled pore glass (CPG) size, over the ionic strength range 0.001-0.5 M was found to display nonmonotonic behavior as a function of pore size. Both adsorption kinetics and ionic strength effects deviated dramatically from behavior typical of adsorption on flat surfaces when the ratio of the pore radius Rp to the polymer hydrodynami...

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