Effect of temperature and aging on the adsorption and desorption of menadione in soil

Abstract

In this study, the effect of soil temperature and aging on the adsorption and desorption of menadione was investigated using the batch equilibrium method. The obtained isotherm data can be well fitted to the linearized form of the Freundlich equation, with R2 values ranging between 0.91 and 1.00. The adsorption and desorption of menadione in non‐aged (control) soil increased significantly when the temperature ranged between 15 and 37°C. Among soils that were amended with menadione and aged for 72 h, the sample with 2 μg·g−1 amendment showed significantly higher adsorption/desorption than those with 10 and 20 μg·g−1 amendments (P < 0.05). Thermodynamic and isotherm hysteresis analyses demonstrated that the sorption of menadione on the control and aged soils was a spontaneous and endothermic process. Physical sorption was the predominant mechanism, and there was negative hysteresis during desorption. Furthermore, thermodynamic calculation and infrared spectral analyses suggested that the main sorption force was hydrogen bonding in all the soil samples, and the entropy gain in the whole adsorbate‐adsorbent system was the main thermodynamic driving force. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 997–1004, 2017

Evaluation of factors affecting tetracycline and diclofenac adsorption by agricultural soils using response surface methodology

“…The four‐zone effects were observed from contour surfaces, which implies that different responses were obtained for DCF adsorption by the soil M at different DCF concentration and temperature values. This may be due to the interaction between the molecular structure of DCF and ionic structures in the soil M. Therefore, the adsorption of DCF in soil M is likely to be endothermic, which agrees with the finding of Jenkins et al 51 and Gao et al 25 for atrazine, imazapyr, and menadione in soil, respectively. In addition, in endothermic adsorption, an increase in temperature causes a decrease in solution viscosity.…”

“…The XRF analysis results of the soils S and M are shown in Table S2 (in Data S1). According to Table S2, Ca dominates the soil S while Si dominates the soil M. These analysis results indicated that quartz for soil M and calcite for soil S as predominant phases 25 . Ca is the dominant cation in the exchange mechanism.…”

“…According to Table S2, Ca dominates the soil S while Si dominates the soil M. These analysis results indicated that quartz for soil M and calcite for soil S as predominant phases. 25 Ca is the dominant cation in the exchange mechanism. The percentages of Na, K, and Mg in the soil S were 0.0349, 0.2053, and 1.5709 while those values in the soil M were 0.7201, 3.9787, and 2.3601, respectively.…”

“…The soil adsorption, which is affected by the temperature and pH, significantly affects the concentration of organic pollutants. In addition, as the pollutant is increasingly retained in soil over time, contact time affects the exposure of living organisms and the toxicology of the pollutant 25 …”

“…In addition, as the pollutant is increasingly retained in soil over time, contact time affects the exposure of living organisms and the toxicology of the pollutant. 25 In light of the literature reviewed above, this study aims to investigate the soil environmental parameters (pH, contact time, soil amount, temperature, initial pollutant concentration) and potential interaction mechanisms affecting TC and DCF adsorption in two agricultural soils. To understand this situation better, the interactions between the independent variables (soil environmental parameters) and the adsorption mechanism were discussed.…”