Exploiting the synergistic influence of AgNPs-TiO 2 NPs: enhancing phytostabilization of pb and mitigating its toxicity in Vigna unguiculata

• Published in: International journal of phytoremediation pp. 1 - 11
• Main Authors: Azeez, Luqmon, Adejumo, Ayoade L, Oladejo, Abayomi A, Olalekan, Bukola, Basiru, Saheed, Oyelami, Oyeyinka K, Makanjuola, Abdulrahman O, Ogungbe, Victoria, Hammed, Aisha, Abdullahi, Monsurat
• Format: Journal Article
• Language: English
• Published: United States 10-10-2024
• Subjects: Immobilization; metal toxicity; silver nanoparticles; Malondialdehyde level; titanium dioxide nanoparticle; translocation factor
• ISSN: 1522-6514; 1549-7879
• DOI: 10.1080/15226514.2024.2412815

In this study, a composite of silver and titanium dioxide nanoparticles (AgNPs-TiO
NPs) was examined for its synergistic effects on phytostabilization of lead (Pb) and mitigation of toxicity in cowpea (
(L) Walp). Seeds of
were wetted with water, 0.05 and 0.1 mgL
Pb and 25 mgmL
each of AgNPs, TiO
NPs, and AgNPs-TiO
NPs. Root lengths of
were reduced by 25% and 44% at 0.05 and 0.1 mgL
Pb, respectively, while shoot lengths were reduced by 2% and 7%. In
, AgNPs and TiO
NPs significantly improved physiological indicators and mitigated Pb effects, with TiO
NPs modulating physiological parameters more effectively than AgNPs. The composite (AgNPs-TiO
NPs) synergistically regulated
physiology better than individual nanoparticles. Compared to individual AgNPs and TiO
NPs, the composite (AgNPs-TiO
NPs) synergistically increased antioxidant activity by 12% and 9%, and carotenoid contents by 88%. Additionally, AgNPs-TiO
NPs effectively reduced malondialdehyde levels by 29%, thereby mitigating the effects of Pb on
better than individual nanoparticles. AgNPs-TiO
NPs enhanced Pb immobilization by 57%, reducing its translocation from soil to shoots compared to
wetted with water. The bioconcentration and translocation factors of Pb indicate that phytostabilization was most effective when the composite was used.