Mechanistic insights into primary biotransformation of diethyl phthalate in earthworm and significant SOD inhibitory effect of esterolytic products

Fan, Xiuli; Gu, Chenggang; Cai, Jun; Zhong, Ming; Bian, Yongrong; Jiang, Xin

doi:10.1016/j.chemosphere.2021.132491

Cited by 8 publications

(1 citation statement)

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“…Adsorption experiments and adsorption influence factors were employed to analyze the adsorption behavior and to predict the adsorption mechanisms [30,31]. Therefore, the specific aims are: (1) to elucidate the DEP adsorption capacities on biochars derived from different biomass feedstocks; (2) to investigate the influence of pH, ionic strength, and temperature in the reaction system on the DEP sorption capacity; (3) to explore how the composition of biochars determines the characteristic and further affects the adsorption effect of DEP; and (4) to figure out the underlying adsorption mechanisms [32]. This work can help to understand the relationship between the physicochemical properties of biochars and the mechanisms of DEP sorption onto biochars, thereby presenting the necessary data for screening the biochar adsorbents for effective DEP removal [33,34].…”

Section: Introductionmentioning

confidence: 99%

Use of Typical Wastes as Biochars in Removing Diethyl Phthalate (Det) from Water

Chai

Jia

2022

Processes

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Diethyl phthalate (DEP), one of the six typical PAEs priority pollutants declared by the US EPA, has attracted tremendous attention due to its widespread pollution and was selected as the adsorbate in this study. Properties of biochar samples obtained from three different feedstocks, i.e., sawdust (SDBC), rice straw (RSBC), and giant reed (GRBC), pyrolyzed at 400 °C as well as their ability to adsorb DEP from an aqueous solution were investigated. The results showed that the adsorption kinetics were well fitted with the pseudo-second-order model (R2 > 0.99) and the intraparticle diffusion model (R2 > 0.98). The maximal adsorption capacity of the DEP by the prepared biochar was in an order of GRBC (46.04 mg g−1) > RSBC (31.54 mg g−1) > and SDBC (18.39 mg g−1). The higher adsorption capacity of DEP by GRBC is mainly attributed to the higher surface area. The reduction in adsorption capacity of the biochar against DEP with an increase in the solution pH (from 2.5 to 10.0) was possibly due to promoting the electrostatic repulsion between the DEP and the surface of the biochar. However, the increasing sodium ionic strength promoted the adsorption of the biochar, which could be interpreted by the reduced solubility of the DEP due to enhancing “salting out” effects as increasing sodium concentration. In addition, it was favorable for the adsorption of DEP onto the biochars at a lower temperature (15 °C) and the calculated ∆G0 was less than zero, indicating that the adsorption was a spontaneous and exothermic process. These experiments designate that these derived biochars can be used as an inexpensive adsorbent for the purification of PAEs contaminated water.

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