RESEARCH PAPER
Effect of Wood Vinegar on Adsorption and Desorption of Four Kinds of Heavy (loid) Metals Adsorbents

https://doi.org/10.1016/S1872-2040(19)61217-XGet rights and content

Abstract

Wood vinegar (WV) is a common agricultural additive used for treatment of soil and stimulation of plant growth. Phosphate rock powder (PR), coal fly ash (CFA), zeolite (ZE) and bentonite (BE) are the common adsorbents for heavy (loid) metals (HMLs)-contaminated soil treatment. The present study focused on the effect of desorption of Pb(II), Cd(II) and As(III) from adsorbents in the presence of WV. The experimental results revealed that the removal fractions of HMLs from adsorbents gradually decreased and then remained steady with the increase of dilution ratios of WV. Subsequently, the optimal additive concentration of WV on different adsorbents was obtained. The experiment results revealed that acetic acid was the dominating component in WV affecting adsorption capacities of adsorbents for HMLs. Moreover, the research took the first time to discover that the addition of WV effectively modified the structure of adsorbents to improve adsorption capacities for HMLs. Given the advantages of low cost and green products of WV, this study not only provided an effective guidance for rational management of agricultural and environmental safety, but paved a new path to modify the structure of adsorbents for better adsorption capacities for HMLs via addition of WV.

Graphical abstract

Pb(II), Cd(II) and As(III)-contained adsorbents which have repaired soil were applicated with wood vinegar(WV). It was found that WV caused the desorption of Pb(II), Cd(II) and As(III) from adsorbents. This study not only provided an effective guidance for rational management of environmental safety, but paved a new path to modify the structure of adsorbents for better adsorption capacities for HMLs Pb(II), Cd(II) and As(III) addition of WV.

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      In fact, the measured concentrations were so low that the variations detected, even when statistically significant compared to controls, were most probably determined by the intrinsic variability of the samples (Loppi et al., 2019). Noteworthy, acetic acid, one of the main components of wood distillate, was found to influence adsorption capacities for heavy metals and metalloids of common soil sorbents used for the treatment of contaminated soils, by decreasing pH and enhancing the removal of As, Cd and Pb cations in multi-metal systems depending on the concentration of the solutions (Sun et al., 2020). Moreover, the low pH of the treating solutions may influence the uptake of heavy metals in lichens as well as their effects on chlorophyll integrity (Garty et al., 1992).

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