Sorption kinetics of anionic surfactant on to waste tire rubber granules (original) (raw)
Related papers
Removal of Surfactants Using Rubber Granules as an Adsorbent
2018
Surfactants are regarded as one of the major and most undesirable pollutants detected in the aquatic and terrestrial environment. Massive quantities of surfactants are being used in daily life and most of them end up dispersed in different environmental compartments greatly affecting the ecosystem. Surfactant toxicity has aroused worldwide attempts to reduce the after effects of these silent toxicants. In the present study, an attempt was made to find the efficiency of using rubber granules in the removal of anionic surfactant (AS) from water. Linear Alkylbenzene Sulfonate (LAS) was selected as a representative member of AS as it is the most commonly used constituent seen in detergents and soaps . The removal efficiency, maximum adsorption capacity and cost were the guiding parameters for the selection of the adsorbent in the present study. Considering all the factors, waste tire rubber granules were chosen as the best adsorbent for AS removal. A series of laboratory batch and colum...
Adsorbent selection for anionic surfactant removal from water
Indian journal of …, 2005
In the present study, an attempt was made to find out a low cost adsorbing material for the removal of anionic surfactant (AS) from water. Sodium dodecyl sulphate (SDS) has been selected as a representative member of AS. Adsorbents such as granular activated charcoal, waste tire rubber granules, wood charcoal, and silica gel were tried. Kinetic profiles of removal of SDS were generated for all materials to assess the equilibrium time. The percentage of SDS removal at 7h equilibrium time was 96% for granular activated charcoal, 96.5% for waste tire rubber granules, 88% for wood charcoal and 92% for silica gel. Equilibrium studies were carried out for all materials to assess the adsorption equilibrium model that they followed. The correlation coefficients were determined by linear regression analysis, and compared. Maximum adsorption capacities (Q max) for granular activated charcoal, waste tire rubber granules, wood charcoal and silica gel, were found to be 3.750, 4.164, 5.170 and 5.181 mg/g, respectively. The removal efficiency, maximum adsorption capacity and cost were the guiding parameters for the selection of the adsorbent in the present study. Considering all factors waste tire rubber granule was chosen as the best adsorbent for AS removal. The physical or chemical characteristics of the rubber granules were reported.
Journal of the Serbian Chemical Society, 2004
In this study, the effect of pH on the removal of anionic surfactants, such as linear alkyl benzene sulfonate (LABS) and dodecyl benzene sulfonate (DBS) by means of adsorption by activated carbon was investigated. For this purpose activated carbon was used as adsorbent. Anionic surfactant solutions with initial pH values of 3, 6, 8 and 12 were used. The adsorption isotherms for the adsorption of anionic surfactants by active carbon at different pH were determined. These adsorption isotherms were seen to be consistent with Freundlich's adsorption isotherm. k and n constants were determined from Freundlich's linear equation. Adsorption rate constants were determined from the obtained kinetic curves which were suitable for the first order of rate kinetics.
Kinetics of Adsorption of Anionic, Cationic, and Nonionic Surfactants
Industrial & Engineering Chemistry Research, 2005
The kinetics of adsorption of anionic, nonionic, and cationic surfactants on a cellulose-water interface were investigated. The effects of monovalent, divalent, and a mixture of mono-and divalent salts on the adsorption kinetics of anionic surfactant were also investigated. The cellulose surface is shown to have dual sites of hydrophobic and hydrophilic nature. It is shown that anionic and nonionic surfactant molecules mostly adsorb on the hydrophobic site while cationic surfactant molecules mostly adsorb on the hydrophilic site. A simple model based on two-site adsorption is developed to describe the kinetics of adsorption. The values of rate constants are determined by using the experimental data and are compared with those reported in the literature. The rate constants show that the rates of adsorption of sodium dodecylbenzenesulfonate (NaDBS) and polyethoxylated tert-octylphenol (TX-100) are same and cetyltrimethylammonium bromide is higher than NaDBS and TX-100 at the cellulose-water interface.
2016
Civil Engineering Department, Indian Institute of Technology, Kharagpur-721 302, West Bengal, India<br> E-mail : coco.ashish@gmail.com, anjalipal@civil.iitkgp.ernet.in Fax : 91-3222-282254 Adsorption process has been found to be one of the oldest and finest treatment methods for surfactants removal.<br> As the control of water pollution has become important in current years, the use of physical, chemical and<br> biological treatment methods such as membrane filtration, ion-exchange, coagulation/flocculation and biological degradation<br> have become more and more challenging in terms of cost and efficiency. Adsorption is a technique, which is extensively<br> used for surfactant removal. In the present review, the focus is made on the adsorption process using low-cost<br> materials, and it is compared with other techniques for surfactant remediation.
Batch study, equilibrium and kinetics of adsorption of naphthalene using waste tyre rubber granules
Journal of Xenobiotics, 2014
The potential use of waste tyre rubber granules (WTRG) for the batch adsorption of naphthalene from aqueous solutions was investigated. The effect of various operational variables such as contact time, initial naphthalene concentration, adsorbent dose, size of adsorbent particles, and temperature of solution on the adsorption capacity of WTRG was evaluated. The adsorption of naphthalene by WTRG was a fast kinetic process with an equilibrium contact time of 60 min. A low temperature (5°C), small adsorbent particle size (0.212 mm) and higher adsorbent dosage favored the adsorption process. Results of isotherm studies revealed that adsorption of naphthalene was best described by the Langmuir isotherm equation…
Static and Dynamic Adsorption of Anionic and Nonionic Surfactants
Society of Petroleum Engineers Journal, 1977
The adsorption of commercial polyoxyethylene nonyl phenols and alkyl benzene sulfonates was studied by measuring the surfactant breakthrough from Berea cores. A rate model that reduces to a Langmuir-type isotherm at equilibrium represented these dynamic results and predicted successfully the equilibrium isotherms determined by static experiments.The ratios of both adsorption and desorption were determined and were observed to increase with the number of ethylene oxide groups. Adsorption of the nonionic surfactant appeared to be by hydrogen bonding and the amount adsorbed per unit of area was the same on a number of metal oxide substrates.Negligible adsorption was observed for sulfonates with an alkyl chain length of 9 or less. Introduction Surfactant adsorption is one of the important features governing the economic viability of chemical flooding processes. However, the adsorption on mineral oxide surfaces is only one of several possible mechanisms leading to surfactant losses.Other...
Removal of anionic surfactant from wastewater by alumina: a case study
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2005
The adsorption characteristics of sodium dodecyl sulfate (SDS) on neutral alumina were studied in detail. Alumina was found to be an efficient adsorbent for SDS and could be used for the removal of anionic surfactant (AS) from wastewater when it is present in high concentration (several thousand ppm). In the present work the actual laundry wastewater was treated by both batch and continuous mode. The initial AS concentration in wastewater was 8068 ppm. The optimum adsorbent dose and equilibrium time found were 120 g/l and 1 h, respectively. Under optimised conditions the removal efficiency was found to be 94%. The removal of SDS by alumina follows the pseudo-second order reaction kinetics. In column study the flow rate was maintained at 1.63 m 3 /m 2 /h. The breakthrough and exhaust time were found to be 48 and 86 min, respectively, using 10 cm column depth. Height of adsorption zone was found to be 5.5 cm and the rate at which the adsorption zone was moving through the bed was 9.42 cm/h. The percentage of the total column saturated at breakthrough was found 75.5%. The value of adsorption rate coefficient (K) and adsorption capacity coefficient (N) were obtained as 0.000824 l/(mg h) and 143460 mg/l, respectively. After exhaustion, aqueous NaOH could efficiently regenerate alumina.
International Journal of Scientific Research in Knowledge, 2013
Waste tyre rubber granules (WTRG) were used to adsorb toluene from aqueous solutions. Their sorption capacities were determined by testing the effect of variables such as contact time, initial concentration of toluene, amount of adsorbent, size of adsorbent particles, and temperature of solution. The adsorption of toluene by WTRG was relatively fast (equilibrium time of 30 min). Increasing the dosage of WTRG and the concentration of toluene in solution resulted in an increase in the adsorption capacity of WTRG. The adsorption capacity of WTRG decreased from 18.12 to 13.32 mg/g with increase in particle size from 0.212 to 2.36 mm while an increase in the temperature from 5 to 40 °C resulted in a decrease in the adsorption capacity from 17.57 to 16.26 mg/g. The adsorption of toluene was best described by the Lagergren pseudo-first order kinetic equation and Langmuir isotherm equation. This study has shown that WTRG can be used for the adsorption of toluene from aqueous solutions.
Mathematical Model of Sorption Kinetics of Crude Oil by Rubber Particles from Scrap Tyres
Leonardo Journal of …, 2011
This paper present an insight into how rubber particles from scrap tyres can be utilized to clean up oil spillages as well as how the process of sorption of crude oil by rubber particles can be stimulated based on sorption kinetics. Crude oil sorption tests using recycled rubber particles (a model absorbent) were designed for investigating crude oil concentration profiles. The model based on a linear driving force (LDF) was developed using a set of experimental data and multiple regression analysis. The crude oil sorption performance tests were conducted under various operating conditions by varying parameters such as rubber particle size and absorption temperature. The predictive capacity of the kinetic model was evaluated under conditions significantly different from those that have already been measured. The experimental results obtained previously were correlated with the first order sorption kinetics model developed. The results showed that the first order kinetics model accurately correlate the experimental data generated. Also, satisfactory results were obtained from simulation of other operating conditions; hence the crude oil sorption kinetics is first order.