This document provides an overview of adsorption, including the basics of physisorption and chemisorption, adsorption isotherms like Freundlich and Langmuir, kinetics, batch adsorption processes, common industrial adsorbents, and applications. Adsorption involves the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid onto a surface. It can be either physical (physisorption) or chemical (chemisorption) in nature. Adsorption isotherms describe the relationship between amount adsorbed and pressure at constant temperature.
Adsorption is the adhesion of molecules of gas, liquid, or dissolved solids to a surface. This process creates a film of the adsorbate (the molecules or atoms being accumulated) on the surface of the adsorbent. It differs from absorption, in which a fluid permeates or is dissolved by a liquid or solid.
Type of adsorption- Pharmaeutical Physical ChemistrySanchit Dhankhar
Adsorption
Adsorption versus absorption, Desorption
Types of adsorption: Physisorption and Chemisorption
Factors affecting adsorption
Adsorption isotherms: Freundlich and Langmuir
Gibbs adsorption isotherm
Bet equation and its use in surface area determination
Applications
ADSORPTION
Adsorption is the process in which matter is extracted from one phase and concentrated at the surface of a second phase. (Interface accumulation). This is a surface phenomenon as opposed to absorption where matter changes solution phase, e.g. gas transfer. This is demonstrated in the following schematic.
Adsorption is the adhesion of molecules of gas, liquid, or dissolved solids to a surface. This process creates a film of the adsorbate (the molecules or atoms being accumulated) on the surface of the adsorbent. It differs from absorption, in which a fluid permeates or is dissolved by a liquid or solid.
Type of adsorption- Pharmaeutical Physical ChemistrySanchit Dhankhar
Adsorption
Adsorption versus absorption, Desorption
Types of adsorption: Physisorption and Chemisorption
Factors affecting adsorption
Adsorption isotherms: Freundlich and Langmuir
Gibbs adsorption isotherm
Bet equation and its use in surface area determination
Applications
ADSORPTION
Adsorption is the process in which matter is extracted from one phase and concentrated at the surface of a second phase. (Interface accumulation). This is a surface phenomenon as opposed to absorption where matter changes solution phase, e.g. gas transfer. This is demonstrated in the following schematic.
Adsorption, types of adsorption, physisorption, chemisorption, mechanism of adsorption, Difference between adsorption and absorption, Factors affecting adsorption, applications of adsorption-
Gas masks
Adsorption indicators
Chromatographic separation
Removal of coloring matter
Heterogeneous catalysis
Controlling humidity
Curing diseases
Froth flotation process
Production of high vacuum
Purification,
adsorption equilibrium, adsorption isotherms, Langmuir isotherm- assumptions, Langmuir equation, limitations of Langmuir isotherm, equation, Freundlich isotherm- Assumptions of Freundlich Isotherm,Limitations of Freundlich Isotherm,Differences between Freundlich and Langmuir adsorption isotherms, BET isotherm-Drawbacks of BET adsorption theory, Types of BET adsorption isotherms, Differences between Langmuir and BET adsorption isotherm, Applications of BET isotherm, Why is Langmuir surface area always higher than BET surface area?
Temkin isotherm, D-R isotherms, Drawbacks of D-R Isotherm, Drawbacks of Temkin Isotherm, Uses of D-R isotherms, applications of adsorption isotherms -Spontaneity,
Exothermicity,
Percentage removal of adsorbate,
Langmuir parameters- maximum adsorbent uptake and affinity between adsorbent and adsorbate,Freundlich parameters- adsorption capacity of adsobents.
BET isotherms- specific surface area, pore size distribution curves
D-R parameters- adsorption mechanism
Temkin parameters- adsorbent-adsobate interactions
Surface Tension is defined as the tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area.
It is due to the phenomena of surface tension that the drops of water tend to assume a spherical shape to attain minimum surface area. the presentation gives a brief description of the methods to measue this important property of the interface of two fluid.
SURFACE TENSION, INTERFACIAL TENSION, SURFACE FREE ENERGY, Measurement of surface and interfacial tension-capillary rise method, drop number method, drop weight method, Du Nuoy tensiometer method, Spreading of liquids, spreading coefficient, surface active agents, hydrophilic-lipophilic balance, soluble monolayers, Adsorption on solid surface, Isotherms
Adsorption, types of adsorption, physisorption, chemisorption, mechanism of adsorption, Difference between adsorption and absorption, Factors affecting adsorption, applications of adsorption-
Gas masks
Adsorption indicators
Chromatographic separation
Removal of coloring matter
Heterogeneous catalysis
Controlling humidity
Curing diseases
Froth flotation process
Production of high vacuum
Purification,
adsorption equilibrium, adsorption isotherms, Langmuir isotherm- assumptions, Langmuir equation, limitations of Langmuir isotherm, equation, Freundlich isotherm- Assumptions of Freundlich Isotherm,Limitations of Freundlich Isotherm,Differences between Freundlich and Langmuir adsorption isotherms, BET isotherm-Drawbacks of BET adsorption theory, Types of BET adsorption isotherms, Differences between Langmuir and BET adsorption isotherm, Applications of BET isotherm, Why is Langmuir surface area always higher than BET surface area?
Temkin isotherm, D-R isotherms, Drawbacks of D-R Isotherm, Drawbacks of Temkin Isotherm, Uses of D-R isotherms, applications of adsorption isotherms -Spontaneity,
Exothermicity,
Percentage removal of adsorbate,
Langmuir parameters- maximum adsorbent uptake and affinity between adsorbent and adsorbate,Freundlich parameters- adsorption capacity of adsobents.
BET isotherms- specific surface area, pore size distribution curves
D-R parameters- adsorption mechanism
Temkin parameters- adsorbent-adsobate interactions
Surface Tension is defined as the tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area.
It is due to the phenomena of surface tension that the drops of water tend to assume a spherical shape to attain minimum surface area. the presentation gives a brief description of the methods to measue this important property of the interface of two fluid.
SURFACE TENSION, INTERFACIAL TENSION, SURFACE FREE ENERGY, Measurement of surface and interfacial tension-capillary rise method, drop number method, drop weight method, Du Nuoy tensiometer method, Spreading of liquids, spreading coefficient, surface active agents, hydrophilic-lipophilic balance, soluble monolayers, Adsorption on solid surface, Isotherms
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
3. Adsorption basics
● Adsorption is the adhesion of atoms, ions or
molecules from a gas, liquid or dissolved solid to a
surface.
● An adsorbate is any substance that has a substance
that is adsorbed.
● An Adsorbent is usually a solid substance that adsorbs
another substance.
● adsorption is more exothermic than liquefaction.
● Adsorption is spontaneous in nature
ΔG= negative
ΔH= negative
3
4. Physical adsorption or physisorption
4
● low interaction between molecules and solid surfaces.
● physisorption attains quickly the equilibrium, and thus
it is reversible
● The physisorption of gases on solids is frequently used
for textural analyses of catalysts and solids, such as
surface area and pore distribution and sizes.
Chemical adsorption or chemisorption
● the interaction is specific between molecules and solids, the adsorbed molecules form a
monolayer.
● The chemisorption processes need longer times to attain the equilibrium condition, in particular
at low temperatures
6. ADSORPTION ISOTHERMS
6
❖ Adsorption process is usually studied through graphs known as Adsorption
Isotherm
OR
❖ The amount of gas adsorbed with the equilibrium pressure at constant
temperature.
[n = f(P, T, gas, solid)]
7. FREUNDLICH
ISOTHERM
7
● x/m = adsorption per gram of adsorbent which is obtained by
dividing the amount of adsorbate (x) by the weight of the
adsorbent (m).
● P is Pressure, k and n are constants whose values depend
upon adsorbent and gas at particular temperature .
● Taking the logarithms of Freundlich Isotherm : Freundlich
Isotherm correctly established the relationship of adsorption with
pressure at lower values,
Limitation : Failed to predict adsorption capacity at higher pressure
Empirical equation for representing the isothermal variation of adsorption of
a quantity of gas adsorbed by unit mass of solid adsorbent with pressure is
Freundlich Adsorption Isotherm
log(x/m) = log K + (1/n) log C…………. Freundlich Adsorption
Isotherm
8. 8
Langmuir Adsorption isotherm
★ Limitation : Valid for Low Pressures only
Explains adsorption by assuming an adsorbate behaves as an ideal gas at
isothermal conditions.
1. Adsorption of adsorbates takes place at well-defined local sites. 30
Introduction to Adsorption
2. All adsorption sites are the same (energetically), and each site
accommodates only one adsorbate molecule.
3. There is no lateral interaction between adsorbed molecules.
Adsorption rate = kap (qm- q)
Desorption rate = kd q
● ka and kd are the adsorption and desorption
rate constants,
● qm is the maximum adsorption (when all
sites are filled).
● p is the adsorbate pressure
q
9. Brunauer–Emmett–Teller (BET) theory
9
BET model of multilayer adsorption, that is,
● gas molecules physically adsorb on a solid in layers infinitely;
● gas molecules only interact with adjacent layers; and
● the Langmuir theory can be applied to each layer.
● the enthalpy of adsorption for the first layer is constant and greater
than the second (and higher).
● the enthalpy of adsorption for the second (and higher) layers is the
same as the enthalpy of liquefaction
------------------------- BET Adsorption
Isotherm BET PLOT
★ Limitation : It violates the Gibbs' phase rules
11. Desorption
11
the products of the surface reaction adsorbed on the surface are subsequently desorbed
into the gas phase
the rate of desorption of C is
where KDC is the desorption equilibrium constant with units of atm. the desorption step for C is just the reverse of
the adsorption step. Consequently, the rate of desorption of C, rDC, is just opposite in sign to the rate of
adsorption of C, rADC
the desorption equilibrium constant KDC is just the reciprocal of the adsorption equilibrium constant for C, KC
rate of desorption of C can be written
12. Batch Adsorption
12
● In batch adsorption, for good adsorbent/solution contact, adsorbents
should remain in suspension and not settle out due to gravity.
● t that the concentration of the solution be kept uniform. To insure the
presence of this so-called “just suspension”
● t that the concentration of the solution be kept uniform. To insure the
presence of this so-called “just suspension”
● The empirical correlation of the “just suspension” stirrer speed (rev/s),
njs, is found to be
● D is the stirrer diameter (m);
● ν, the solution kinematic viscosity (m2 /s)
● dp, the adsorbent particle diameter (m);
● g, the gravitational acceleration (m/s2 );
● B, the percentage (by weight) of adsorbent of
the adsorbent-solution mixture
15. References
15
● Chemical Reaction Engineering by Martin SCHMAL
● INTRODUCTION TO ADSORPTION Basics, Analysis, and Applications BY CHI TIEN
● Elements of Chemical Reaction Engineering by H Scott Fogler( 5th edition)