Abstract
A 56d incubation experiment was conducted to explore the effects of the silk-worm excrement biochar (500 °C, BC) combined with different iron-based materials (FeCl3, FeSO4, and reduced iron powder) on the speciation of cadmium (Cd) and lead (Pb) in a contaminated soil. Application rate of BC and iron-based materials is 1% (W/W) and 0.2% (W/W) of the soil, respectively. At the same time, the soil physicochemical properties, such as pH, cation exchange capacity (CEC), and the structure of soil, were determined in order to explore the influence mechanism of amendments to forms of Cd and Pb in soil. The results show that the stabilization effects on Cd is (BC + FeSO4) > (BC + FeCl3) > (BC + Fe) > (BC) and Pb is (BC + Fe) > (BC + FeSO4) > (BC + FeCl3) > (BC) at the end of incubation, compared with the effect of the control group. The treatment of (BC + FeSO4) is the most effective in terms of the stabilization of Cd and Pb, which makes the percentages of organic-bound and residual Cd and Pb increase by 40.90% and 23.51% respectively. In addition, with different ways of treatment, the pH value and CEC of soil see a remarkable increase by 1.65–2.01 units and 2.01–2.58 cmol·kg−1 respectively. X-ray diffraction (XRD) patterns show that the soil imprisons Cd and Pb in different mineral phases. As such the treatment of (BC + FeSO4) can significantly improve soil environment, increase soil pH value & CEC and exert a relatively good stabilization effect on both Cd and Pb.
Highlights
Cadmium (Cd) and lead (Pb) are two typical potential toxic metals (PTMs) [1] that often compound with each other and cause soil pollution
This research uses the silk-worm excrement biochar, ferric chloride (FeCl3 ), ferrous sulfate (FeSO4 ·7H2 O), and reduced iron powder (Fe) as materials to explore whether adding iron-based materials can increase the stabilization of Cd and Pb in soil under the condition of applying the silk-worm excrement biochar
Different materials were added into the soil samples as follows: 1 control (CK); 2 1% silk-worm excrement biochar (BC); 3 1% silk-worm excrement biochar + 0.2% FeCl3 (BC + FeCl3 ); 4 1% silk-worm excrement biochar + 0.2% FeSO4 ·7H2 O (BC + FeSO4 ); 5 1% silk-worm excrement biochar + 0.2% reduced iron powder (BC + Fe)
Summary
Cadmium (Cd) and lead (Pb) are two typical potential toxic metals (PTMs) [1] that often compound with each other and cause soil pollution. This research uses the silk-worm excrement biochar, ferric chloride (FeCl3 ), ferrous sulfate (FeSO4 ·7H2 O), and reduced iron powder (Fe) as materials to explore whether adding iron-based materials can increase the stabilization of Cd and Pb in soil under the condition of applying the silk-worm excrement biochar. This is trying to explore the effects of combination of these materials on the speciation of Cd and Pb in composite contaminated soil and to analyze the effects of different treatments on soil physicochemical properties in soil. Hopefully a material combination which has a good effects on stabilization of Cd and Pb can be found, and can provide a new suggestion for Cd and Pb contaminated soil remediation and open up a new way for agricultural waste disposal in Guangxi
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