Heavy metals immobilization and bioavailability in multi-metal contaminated soil under ryegrass cultivation as affected by ZnO and MnO2 nanoparticle-modified biochar

被引:19
作者
Ghandali, Mahboobeh Varnaseri [1 ]
Safarzadeh, Sedigheh [1 ]
Ghasemi-Fasaei, Reza [1 ]
Zeinali, Sedigheh [2 ]
机构
[1] Shiraz Univ, Sch Agr, Dept Soil Sci, Shiraz, Iran
[2] Shiraz Univ, Fac Adv Technol, Shiraz, Iran
关键词
ZINC-OXIDE NANOPARTICLES; ZEA-MAYS L; CADMIUM ACCUMULATION; HIGHLY EFFICIENT; GRAPHENE OXIDE; POTENTIAL ROLE; CD; AVAILABILITY; MANGANESE; IRON;
D O I
10.1038/s41598-024-61270-5
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Pollution by heavy metals (HMs) has become a global problem for agriculture and the environment. In this study, the effects of pristine biochar and biochar modified with manganese dioxide (BC@MnO2) and zinc oxide (BC@ZnO) nanoparticles on the immobilization and bioavailability of Pb, Cd, Zn, and Ni in soil under ryegrass (Lolium perenne L.) cultivation were investigated. The results of SEM-EDX, FTIR, and XRD showed that ZnO and MnO2 nanoparticles were successfully loaded onto biochar. The results showed that BC, BC@MnO2 and BC@ZnO treatments significantly increased shoots and roots dry weight of ryegrass compared to the control. The maximum dry weight of root and shoot (1.365 g pot(-1) and 4.163 g pot(-1), respectively) was reached at 1% BC@MnO2. The HMs uptake by ryegrass roots and shoots decreased significantly after addition of amendments. The lowest Pb, Cd, Zn and Ni uptake in the plant shoot (13.176, 24.92, 32.407, and 53.88 mu g pot(-1), respectively) was obtained in the 1% BC@MnO2 treatment. Modified biochar was more successful in reducing HMs uptake by ryegrass and improving plant growth than pristine biochar and can therefore be used as an efficient and cost effective amendment for the remediation of HMs contaminated soils. The lowest HMs translocation (TF) and bioconcentration factors were related to the 1% BC@MnO2 treatment. Therefore, BC@MnO2 was the most successful treatment for HMs immobilization in soil. Also, a comparison of the TF values of plant showed that ryegrass had a good ability to accumulate all studied HMs in its roots, and it is a suitable plant for HMs phytostabilization.
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页数:17
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