Effects of Phosphate and Silicate Combined Application on Cadmium Form Changes in Heavy Metal Contaminated Soil
نویسندگان
چکیده
Pollution by heavy metal cadmium (Cd) in soil is still serious and control measures are constantly updated. In this paper, one indoor culture method was applied to investigate the effect of phosphate thermo-activated nano silicate combined application on speciation transformation. A total 7 treatments were designed, which were: simulated cadmium-contaminated without recorded as reference (CK) treatment; mixtures 0.5%, 1.0%, 2.0% dose potassium dihydrogen 700 °C serpentine (potassium phosphate: ratio = 1:2) added soil, denoted nPS700-0.5, nPS700-1.0, nPS700-2.0, respectively; zeolite mixture nPF700-0.5, nPF700-1.0, nPF700-2.0, respectively. The results showed that with or reduced exchangeable Cd content varying degrees increased levels carbonate-bound, Fe-Mn oxide-bound, organic-bound, residual forms different degrees. silicate, higher dosage level, greater reduction better Cd-contaminated remediation: nPS700-2.0 > nPS700-1.0 nPF700-2.0 nPF700-1.0 nPF700-0.5 (N, P, S, F represent nano, KH2PO4, serpentine, zeolite, respectively, represents activation temperature). At same more effective than repairing (nPS700-2.0 nPS700-0.5 nPF700-0.5), indicated combination can passivate a certain extent promote transformation bioavailable into an unusable state. reason why phosphate, absorb after entering because mineral itself directly cadmium. Second, treatment thermal activation, specific surface areas pores minerals increase, enhances adsorption performance. Third, pH value high, environment will rise, thereby transforming H2PO4− PO43−, conducive Cd2+.
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ژورنال
عنوان ژورنال: Sustainability
سال: 2023
ISSN: ['2071-1050']
DOI: https://doi.org/10.3390/su15054503