Adsorption

3.2 Carbon Nanotubes (CNTs) Carbon nanotubes have remarkable adsorption behavior in purification and detoxification of the environmental pollutants[12]. Their characteristics of being highly porous, having large specific area and being not solvable in aqueous solution because of the high Van der Waals interaction forces on the tube walls(pi-stacking) allow them to be great environmental pollutants adsorbent in solution. Thus, researchers have been concentrated on aqueous solution purification with single-walled carbon nanotubes(SWCNTs) and multi-walled carbon nanotubes(MWCNTs). In the past few years, CNTs have been proved to be great pollutants adsorbent for pollutants such as penta-chlorophenol(PCP)[13], polycyclic aromatic hydrocarbons (PAH)[14],…

Introduction: This article provides a brief summary of existing articles H_2 Storage on single and multi-walled carbon nanotubes by Gerasimos E.Ioannatos,Xenophon E.Verykios. And Hydrogen storage in carbon nanotubes revisited written by Chang Liu,Yong Chen, Cheng-Zhang Wu,Shi-Tao Xu,Hui-Ming Cheng. These articles discusses the hydrogen storage aspect in single walled and multiwalled carbon nanotubes. The first article discusses the adsorption of hydrogen on SWCNT and MWCNT at certain…

Activated carbon is a form of carbon that has treated in order to give it small pores, with lower volume, this increases the surface area accessible for adsorption. Adsorption is a procedure where solids are used for taking a soluble contaminate out of water. In this procedure active carbon is the solid that has been mentioned. The reason activated carbon is such a good filter is because of the huge surface area (between 300-2000m2/g), this is because surface area is proportional to adsorption…

procedure: a beaker with a volume of 20 ml of aqueous solution of 6 mmol (CH3COO)2Zn.2H2O, and another beaker contains 10 ml of 20 mmol NaOH. Then NaOH solution was added drop wise to (CH3COO)2Zn.2H2O solution and stirred. The produced precipitate was reserved at 70 Co for 15 hr. The precipitate of ZnO left to coal down then rinsed with solution of (70: 30% H2O : C2H5-OH) then dried at 70 oC for 10 hr before use in the adsorption experiments. Part of the pure ZnO powder was coated by congo red…

200 mg/L and nZVI conc. (0.20 g/L) and initial pH of the conical flask was measured. The pH of the dye solutions were adjusted with dilute HCl (0.1N) or KOH (0.1N) solution by using a pHmeter with pH of solutions being 2,4, 6,8, 10,12 .The adsorption of MR dye on nZVI was studied in a pH range of 2–12. Methyl red is slightly acidic pH ranges from 4.5- 6.5. Fig. 4.3 shows the obtained results. The figure indicates that, for MR, the adsorption is strong in acidic medium. As the pH increase, the…

Table 3 shows the BET surface area of both the fresh and hydrothermally aged SCR catalysts. For fresh BEA zeolite and SCR catalysts, as the doping amount of catalytic additive increases, the BET surface area decreases, probably because the additive Cu, Ce, and Nb species blocked some of the zeolite channel, hindering the entry of N2 into the pores (Bin et al. 2014). After aging at 600 °C, all the samples showed 3-20 m2/g increased BET surface area. Aging condition of 600 °C is a relatively mild…

OBJECTIVE: To study the chemistry behind “LIQUID LUBRICANTS: MECHANISM OF ACTION AND APPLICATIONS”. ABSTRACT: Various books and literatures provided information regarding the application of chemistry in an important and interesting area i.e. lubrication. The literature imparted the following information regarding the liquid lubricants: Lubricants are the substances that that are added to reduce friction between two surfaces. Friction is simply defined as an opposing force that comes into play…

The rate of nickel sorption by immobilized spent yeast in chitosan beads was determined as a function of the adsorbent dosage, initial pH and initial nickel concentration as shown in Fig. 1, 2 and 3, respectively. The sorption rate was rapid at the beginning of the period. It was observed that the equilibrium uptake of nickel by immobilized spent yeast was occurred after 2 hours. Kinetic studies of adsorption To investigate the sorption mechanism, the constants of sorption were determined by…

An adsorption equilibrium usually named adsorption isotherm. It shows how an adsorbate interacts with adsorbent surface and also the amount of tendency of adsorbate to adsorbent will be understood. An adsorption isotherm consists of some constants which values express the surface properties and affinity of the adsorbent (عینا). It can also be used to find the adsorption capacity of adsorbent. At equilibrium the concentration will remain constant (CEJ). By plotting the solid-phase concentration…

Langmuir isotherm The Langmuir adsorption model is established on the following hypotheses: (1) uniformly energetic adsorption sites, (2) monolayer coverage, and (3) no lateral interaction between adsorbed molecules [26]. A mathematical expression of the Langmuir isotherm is given by the following equation: Where qe (mg/g) is the amount of dye adsorbed on the solid adsorbent at equilibrium, qm (mg/g) is the maximum adsorption capacity, KL (L/mg) is the Langmuir equilibrium…