Kinetics and isotherms of dichlorodiphenyltrichloroethane (DDT) adsorption using soil–zeolite mixture

Sarah Mustafa Ahmed, Mohd. Raihan Taha, Omer Muhie Eldeen Taha

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Soil contaminated by organic pollutants such as dichlorodiphenyltrichloroethane (DDT) is an environmental concern due to the strong sorption of organochlorine pesticide onto the soil matrix and persistence in the environment. The remediation of contaminated soils with organochlorine pesticide using nanotechnology is an innovative technology for speeding up this process. This work presents a study of adsorption of DDT onto the zeolite surface. Experiments were conducted using batch adsorption procedures at different DDT concentrations, from 5 to 50 mg/L, and the amount of the zeolite used was 0.1, 0.5, 0.8, and 1.2 g. Results show that the zeolite has a moderate adsorption capacity for the DDT, and the highest adsorption capacity obtained from this study was about 30%. However, the percentage of adsorption can be increased significantly with the increase in the amount of the zeolite in samples. Also, adsorption kinetics and adsorption isotherms were applied. Five different kinetic models, i.e., pseudo-first-order kinetic model, the pseudo-second-order kinetic model, intraparticle diffusion model, Elovich kinetic model, and Bangham kinetic model were used to fit the kinetic data. The result shows that the pseudo-second-order model represented the best fits to the experiments. The adsorption isotherms were determined using three different models as well, i.e., Freundlich, Langmuir, and Temkin. The best-fitted adsorption isotherm models were found to be in both Langmuir and Freundlich. Moreover, results show that the effectiveness of treatment process is highly affected by pH. Increasing the pH has a negative effect on the adsorption process, and best uptake of DDT was noted in acidic media at pH 3.

Original languageEnglish
Article number4
JournalNanotechnology for Environmental Engineering
Volume3
Issue number1
DOIs
Publication statusPublished - 1 Dec 2018

Fingerprint

DDT
Isotherms
isotherm
adsorption
Adsorption
kinetics
Kinetics
Zeolites
zeolite
Adsorption isotherms
Pesticides
Soils
Organic pollutants
nanotechnology
Remediation
Nanotechnology
Sorption
organic pollutant
Experiments
remediation

Keywords

  • Adsorption isotherm
  • Adsorption kinetics
  • DDT
  • Soil contamination

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Bioengineering

Cite this

Kinetics and isotherms of dichlorodiphenyltrichloroethane (DDT) adsorption using soil–zeolite mixture. / Ahmed, Sarah Mustafa; Taha, Mohd. Raihan; Taha, Omer Muhie Eldeen.

In: Nanotechnology for Environmental Engineering, Vol. 3, No. 1, 4, 01.12.2018.

Research output: Contribution to journalArticle

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abstract = "Soil contaminated by organic pollutants such as dichlorodiphenyltrichloroethane (DDT) is an environmental concern due to the strong sorption of organochlorine pesticide onto the soil matrix and persistence in the environment. The remediation of contaminated soils with organochlorine pesticide using nanotechnology is an innovative technology for speeding up this process. This work presents a study of adsorption of DDT onto the zeolite surface. Experiments were conducted using batch adsorption procedures at different DDT concentrations, from 5 to 50 mg/L, and the amount of the zeolite used was 0.1, 0.5, 0.8, and 1.2 g. Results show that the zeolite has a moderate adsorption capacity for the DDT, and the highest adsorption capacity obtained from this study was about 30{\%}. However, the percentage of adsorption can be increased significantly with the increase in the amount of the zeolite in samples. Also, adsorption kinetics and adsorption isotherms were applied. Five different kinetic models, i.e., pseudo-first-order kinetic model, the pseudo-second-order kinetic model, intraparticle diffusion model, Elovich kinetic model, and Bangham kinetic model were used to fit the kinetic data. The result shows that the pseudo-second-order model represented the best fits to the experiments. The adsorption isotherms were determined using three different models as well, i.e., Freundlich, Langmuir, and Temkin. The best-fitted adsorption isotherm models were found to be in both Langmuir and Freundlich. Moreover, results show that the effectiveness of treatment process is highly affected by pH. Increasing the pH has a negative effect on the adsorption process, and best uptake of DDT was noted in acidic media at pH 3.",
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