Abstract
Bisphenol S (BPs) has been found in a variety of common consumer products surrounding human living, despite the fact that it could damage the human digestive system and genital system. In China, straw-returning to the field is a common soil improvement technology used to increase the concentration of dissolved organic matter (DOM), which plays an important role in the natural environment as a microreactor of contaminants. Additionally, the biochar obtained by the straw is an effective soil conditioner. DOM is a key influencing factor when biochar is employed as the conditioner of BPs contaminated soil. However, the BPs adsorption behavior on the Ferralsol affected by DOM and biochar is also unclear. Hence, DOM was prepared and the effect of DOM on the BPs adsorption behavior on soil and biochar modified soil was investigated. DOM was characterized by Elemental analysis, Fourier transforming infrared spectra (FT-IR), and three-dimensional excitation-emission matrix spectra (3D-EEM). The results of the adsorption experiments indicated that both biochar and DOM could improve the BPs adsorption capacity in Ferralsol, while DOM suppressed the BPs adsorption capacity of biochar modified soil, indicating that DOM and BPs could not be applied at the same time for BPs adsorption.
Highlights
In recent years, as straw-returning to the field has become a popular strategy in China, the concentration of dissolved organic matter (DOM) has increased in the soil environment, and many chemical reactions will have occurred between contaminants and DOM, including complexation, redox reactions, and photodegradation [1,2]
cation exchange capacity (CEC) is a measurement of the negative charge of the material surface, which could be neutralized by exchangeable cations [33,38]
DOM adsorption on samples, the results presented as shown amounts amounts on biochar, biochar, soil, and
Summary
As straw-returning to the field has become a popular strategy in China, the concentration of dissolved organic matter (DOM) has increased in the soil environment, and many chemical reactions will have occurred between contaminants and DOM, including complexation, redox reactions, and photodegradation [1,2]. DOM plays an important role in the natural environment as a microreactor of contaminants which could enhance the reactivity of contaminants by bringing them into close association with a very reactive intermediate, and its important influences on the environmental behavior of contaminants have been widely reported [4,5]. The constituents of DOM are extremely complicated, caused by various sources and surrounding environments, including non-humus (such as saccharide, amino acid, protein, lignin, and organic acid) and humus (such as humic acid, fulvic acid, and humin) [6,7].
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