Adsorption: Bulk Solution
2.3. Adsorption
Adsorption is binding process which involves the adhesion of one substance (atoms, ions, molecules) on the surface of the other substance. The substance that is adsorbed is called adsorbate (metal or organic compound) and the medium on which adsorption of the adsorbate takes place is called adsorbent. The adsorption process consists of following steps:
1. Bulk solution transport
2. Film diffusion transport
3. Pore transport
4. Adsorption
Adsorption of the adsorbate occurs on the surface of the adsorbent at specific sites called adsorption sites. Adsorption can occur on the outer surface of adsorbent or with in macro-pores, meso-pores and micro-pores surface. Meso-pore and macro-pore surface area is small as compared to the
…show more content…
Adsorption Isotherm:
Adsorption isotherm is defined as a graphical representation showing the relationship between the amount adsorbed by a unit weight of adsorbent and the amount of adsorbate remaining in a test medium at equilibrium, and it shows the distribution of absorbable solute between the liquid and solid phases at various equilibrium concentrations (Agarwal et al., 2014)
Langmuir Adsorption Isotherm
The Langmuir equation is used to estimate the maximum adsorption capacity corresponding to complete monolayer coverage on the adsorbent surface and is expressed by: qe = (qmax KL Ce) / (1+ KL Ce)
The linear form of the above equation after rearrangement is given
…show more content…
The batch removal of Cr(VI) from aqueous solution was investigated. The influence of pH, initial concentration of metal ion and contact time were also investigated. Kinetics of adsorption was found to follow pseudo-second order model. Both Langmuir and Freundlich adsorption isotherm could be used to describe adsorption isotherm but the Langmuir isotherm was found to be in good agreement with experimental data.
Kishor et al. (2012) has investigated the efficiency of removing copper ions and Zinc ions from copper chloride and zinc chloride, using naturally based adsorbents like soybean hulls and Sugarcane Bagasse respectively. Batch adsorption studies show that the modified Soybean hulls show a great ability for extracting metallic ions from wastewater samples as compared with the Sugarcane bagasse. The results showed that the removal of zinc (Zn+2) by activating sugarcane bagasse is not satisfactory. But as activation procedure is simple & cheap for sugarcane bagasse, it may be used where % zinc removal required is
Procion Red Dye Lab Report
1454 Words | 6 PagesFor this lab, zeolite and magnetized zeolite were synthesized and compared with charcoal to find out with would be the most effective in the sequestering of Procion Red dye. Finding the concentration and absorbance of each zeolite, magnetized zeolite, and charcoal, along with a calibration curve, the best adsorbent is determined. Charcoal was the overall best sequestration of the Procion Red dye, since the adsorbent was highest compared to the others. Introduction Pollution has increased in the environment over the years, so the purpose of this experiment is to find the best adsorbent of chemicals to reduce the pollution.
Nt1310 Lab 6
575 Words | 3 PagesQuestion # 2: Part C In general carbon diffusion in iron is much “faster” than aluminum diffusion in aluminum.
Ee315 Unit 5 Work Sheet
1155 Words | 5 PagesThe equation becomes the following [( ) ] [ ] [ ] We have [ ] [ ] And At the end: [( ) ] [ ] 2 2 2 2
Ap Chemistry Penny Lab
716 Words | 3 PagesIn performing these sets of experiments, in which we would drop a water/water solution onto the surface of a penny, we were trying to test and experiment the bonding qualities of water when made into a solution compared to when the water is pure. When we dropped pure tap water on to a penny, the water, instead of flowing and spreading out, stayed together in a single drop on the penny. We wanted to see how different substances affected this phenomenon. When we formulated our guiding question we made sure to preserve these intents in the language: how do foreign substances influence the bonding quality and strength (to the top of a zinc penny in specific) of water? Since these experiments were conducted in groups, we set up a few roles to
Summary Of Why Colleges Shower Their Students With A's By Brent Staples
305 Words | 2 PagesThis new formula would give
TLC Analysis Of Analgesic Drugs Lab Report
843 Words | 4 PagesTLC Analysis of Analgesic Drugs Introduction The purpose of this experiment was to use thin-layer chromatography (TLC) to determine the composition of various over-the-counter analgesics (acetaminophen, aspirin, caffeine and salicylamide). The methods necessary was thin-layer chromatography Experiment Scheme Prepared at least 12 capillary micropipets to spot the plates. Then obtain two (silica) TLC plates and handle them carefully or the adsorbent may flake off. Handled them only by the edges.
Cyclohexane Lab Report
1710 Words | 7 PagesThis experiment was started to measure the height equivalent of a HETP column to calculate twenty theoretical plates. The company need this information to separate the cyclohexane from the toluene. The separation was accomplished by the use of fractional distillation and gas chromatography. The process yielded one plate for the17.6cm column meaning, that the porcelain beryl saddles as a packing material are ineffective. Although the results were found to be inefficient this may have been due to an error in the calculation, or the amount of time per temperature spent collecting the fractions.
Separation And Purification Of An Unknown/Complex Compound
379 Words | 2 PagesDepending on if the compound is immiscible in water or not, the dissolved substances will have more attraction to one of the layers over the other, therefore separating the two different
Copper Cycle Lab Report
800 Words | 4 PagesIntroduction: The purpose of this experiment is to demonstrate the different types of chemical reactions, those including Copper. There are different types of chemical reactions. A double displacement reaction is a chemical process involving the exchange of bonds between two reacting chemical species. A a decomposition reaction is the separation of a chemical compound into elements or simpler compounds and the single-displacement reaction is a type of
Sulphuric Acid Experiment
759 Words | 4 PagesAnother variable of the experiment that was controlled was the time in which the agar cubes spent in the sulphuric acid. The time allowed calculation of the rate of diffusion. The size of the agar cubes was controlled by using a grid and scalpel to, as accurately as possible, cut the agar cubes into the appropriate sizes. The shape of the agar cubes was also controlled. In future, this could be experimented with to investigate how different shaped agar blocks affect surface area to volume ratio and hence the rate of
Essay On Water Hydrophobicity
1964 Words | 8 PagesModeling of Contact Angle for a Liquid in Contact with a Rough Surface When a solid is in contact with liquid, the molecular attraction will reduce the energy of the system below that for the two separated surfaces. This is expressed by the Dupré equation Figure-1 2.1 Wenzel Model: The Wenzel model (Robert N. Wenzel 1936) describes the homogeneous wetting regime, as seen in Figure 2, and is defined by the following equation for the contact angle on a rough surface. where is the apparent contact angle which corresponds to the stable equilibrium state (i.e. minimum free energy state for the system). The roughness ratio, r, is a measure of how surface roughness affects a homogeneous surface.
Radius Of A Circle Research Paper
640 Words | 3 PagesSo now we will be putting this equation into standard form from general form. So the first step of this would be to move the 22 without a variable onto the other side of the equation to put the variables on one side and real numbers on one side. So now your equation should turn out like this x2+18x+y2+6y=-22. Next you would want to complete the square with variables 18x and 6y, in order to complete this is cutting 18 in half then multiplying it by itself which would come out to be 18-9=9 then 9x9=81 and then do the same for 6y which is 6-3=3 then
Diffusion And Osmosis Lab Report
819 Words | 4 PagesThe size of the pore matters as well. Diffusion is when the movement of molecules from an area of high concentration to an low area concentration. Osmosis is the movement of water
Solution Of Water Pollution
1820 Words | 8 PagesWater is the most important component found on the surface of the earth because it is source of life for living creatures. However, water pollution has become a global concern. Water pollution can have several forms from diverse sources. It is expected that there will be a lack of clean water in next few decades due to pollution. Nile river water in Egypt is the focus of attention of many studies due to many reasons.
More about Adsorption: Bulk Solution
Procion Red Dye Lab Report
1454 Words | 6 PagesPt1420 Unit 6 Question Paper
1184 Words | 5 PagesNt1310 Lab 6
575 Words | 3 PagesEe315 Unit 5 Work Sheet
1155 Words | 5 PagesAp Chemistry Penny Lab
716 Words | 3 PagesSummary Of Why Colleges Shower Their Students With A's By Brent Staples
305 Words | 2 PagesTLC Analysis Of Analgesic Drugs Lab Report
843 Words | 4 PagesCyclohexane Lab Report
1710 Words | 7 PagesSeparation And Purification Of An Unknown/Complex Compound
379 Words | 2 PagesCopper Cycle Lab Report
800 Words | 4 PagesSulphuric Acid Experiment
759 Words | 4 PagesEssay On Water Hydrophobicity
1964 Words | 8 PagesRadius Of A Circle Research Paper
640 Words | 3 PagesDiffusion And Osmosis Lab Report
819 Words | 4 PagesSolution Of Water Pollution
1820 Words | 8 Pages