The Investigation of TiO 2 NPs Effect as a Wastewater Treatment to Mitigate Cd Negative Impact on Bamboo Growth

Abolghassem Emamverdian, Yulong Ding, Farzad Mokhberdoran, Zishan Ahmad and Yinfeng Xie
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Abolghassem Emamverdian: Co-Innovation Center for Sustainable Forestry in Southern China, NO.159, Londpan Road Nanjing, Nanjing Forestry University, Nanjing 210037, China
Yulong Ding: Co-Innovation Center for Sustainable Forestry in Southern China, NO.159, Londpan Road Nanjing, Nanjing Forestry University, Nanjing 210037, China
Farzad Mokhberdoran: Co-Innovation Center for Sustainable Forestry in Southern China, NO.159, Londpan Road Nanjing, Nanjing Forestry University, Nanjing 210037, China
Zishan Ahmad: Co-Innovation Center for Sustainable Forestry in Southern China, NO.159, Londpan Road Nanjing, Nanjing Forestry University, Nanjing 210037, China
Yinfeng Xie: Co-Innovation Center for Sustainable Forestry in Southern China, NO.159, Londpan Road Nanjing, Nanjing Forestry University, Nanjing 210037, China

Sustainability, 2021, vol. 13, issue 6, 1-17

Abstract: The recent emerging evidence reveals that titanium dioxide nanoparticles (TiO 2 NPs) can be used as a wastewater treatment. This study provides new information about the possible detoxification role of TiO 2 NPs as a wastewater treatment in plants under heavy metal stress, with an emphasis on the mechanisms involved. Here, we investigated the effects of TiO 2 NPs as one wastewater treatment on a bamboo species ( Arundinaria pygmaea L.) under in vitro Cadmium (Cd) toxicity conditions. A factorial experiment was conducted in a completely randomized design with four replications of four concentrations of Cd (50, 100, 200, and 300 µM) alone and in combination with 100 and 200 µM TiO 2 NPs as two wastewater treatments, as well as a control treatment. The results indicated that TiO 2 NPs concentrations enhanced enzymatic and non-enzymatic antioxidant activities and proline accumulation as well as reducing hydrogen peroxide (H 2 O 2 ), superoxide radical (O 2 •− ), and malondialdehyde (MDA) levels, which led to improved photosynthetic parameters with an eventual increase in plant biomass as compared to the control treatment. Therefore, TiO 2 NPs improved the photosynthetic parameters of bamboo under Cd toxicity, which led to an increase in plant biomass. We concluded that the wastewater treatments of TiO 2 NPs improved bamboo biomass through the scavenging of reactive oxygen species (ROS) compounds (H 2 O 2 and O 2 •− ), which was induced by the stimulation of the antioxidant capacity of the plant. TiO 2 also protected cell membranes by reducing lipoperoxidation in bamboo under Cd toxicity. The concentration of 200 µM TiO 2 NPs had the most impact in reducing Cd toxicity.

Keywords: wastewater treatment; titanium dioxide nanoparticles; bamboo species; cadmium (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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