Sorption, kinetics and thermodynamics studies of atrazine herbicide removal from water using iron nano-composite material

Abstract

Atrazine organic pollutant has been found in several water resources of the world. It is highly toxic and carcinogenic in nature. Atrazine is removed by adsorption on iron composite nanoparticles. The composite nanoparticles were synthesized, analyzed and applied for atrazine uptake from water. Residual atrazine was monitored by gas chromatography-mass spectrometry. The maximum atrazine removal (95 %) was achieved using contact time 30.0 min, concentration 30.0 lg/L, pH 7.0, dose 2.5 g/L and temperature 20.0°C. The adsorbent was selective for atrazine adsorption. The results obeyed Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms. DG°values were -6.05, -6.11 and -6.15 kJ/mol at 20, 25 and 30°C temperatures, respectively. The value of DS°w as -2.45 9 10 -3 kJ/mol K. It showed decline in entropy of atrazine uptake. The adsorption followed pseudo-second-order kinetics. The adsorption mechanism was liquid film diffusion. The proposed adsorption method is inexpensive, fast and reproducible. It can be used to remove atrazine from any water sample/source.

Stereoselective uptake and degradation of (±)‐o,p‐DDD pesticide stereomers in water‐sediment system

“…Pseudo second‐order kinetic model where Q e −Q t , h, and t have the standard denotations …”

“…where Q e −Q t , h, and t have the standard denotations. [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] Equally, pseudo first-order and pseudo second-order reaction models were used to understand the uptake and degradation for both the stereomers of o,p-DDD.…”

Enantioselective degradation of dufulin pesticide in water: Uptake, thermodynamics, and kinetics studies

“…The same procedure was used for biotic uptake except the use of impregnated sediment with ascorbic acid spiked water. These procedures were adopted from our earlier papers …”

“…The pesticides are being used frequently worldwide to maintain the crop and horticulture productions and household activities. In spite of the beneficial uses of the pesticides, these are toxic to the environment and human beings . The soil is the main destination of the pesticides as about 80% pesticides reside in soil for long time.…”

“…In spite of the beneficial uses of the pesticides, these are toxic to the environment and human beings. [1][2][3][4][5][6] The soil is the main destination of the pesticides as about 80% pesticides reside in soil for long time. These pesticides reach to water, crops, and fruits and finally to human beings.…”