Adsorption of Heavy Metal Ions Copper, Cadmium and Nickel by Microcystis aeruginosa

Abstract

To investigate the treatment effect of algae biosorbent on heavy metal wastewater, in this paper, the adsorption effect of M. aeruginosa powder on heavy metal ions copper, cadmium and nickel was investigated using the uniform experimental method, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and TG-DSC comprehensive thermal analysis. The experimental results showed that the initial concentration of copper ion solution was 25 mg/L, the temperature was 30 °C, the pH value was 8 and the adsorption time was 5 h, which was the best condition for the removal of copper ions by algae powder adsorption, and the removal rate was 83.24%. The initial concentration of cadmium ion solution was 5 mg/L, the temperature was 35 °C, the pH value was 8 and the adsorption time was 4 h, which was the best condition for the adsorption of cadmium ion by algae powder, and the removal rate was 92.00%. The initial nickel ion solution concentration of 15 mg/L, temperature of 35 °C, pH value of 7 and adsorption time of 1 h were the best conditions for the adsorption of nickel ions by algae powder, and the removal rate was 88.67%. The spatial structure of algae powder changed obviously before and after adsorbing heavy metals. The functional groups such as amino and phosphate groups on the cell wall of M. aeruginosa enhanced the adsorption effect of heavy metal ions copper, cadmium and nickel. Additionally, M. aeruginosa adsorption of heavy metal ions copper, cadmium, nickel is an exothermic process. The above experiments show that M. aeruginosa can be used as a biological adsorbent to remove heavy metals, which lays a theoretical foundation for the subsequent treatment of heavy metal pollution by algae.

Toxicity, physiological response, and biosorption mechanism of Dunaliella salina to copper, lead, and cadmium

“…Nevertheless, the accumulation of heavy metals universally intensifies lipid peroxidation and stimulates the generation of reactive oxygen species (ROS), ultimately leading to membrane degradation and oxidative stress, further disrupting the biochemical and metabolic activities of cells ( Alho et al, 2019 ; Chu et al, 2022 ). Correspondingly, the detoxification of aquatic plants against ROS in response to heavy metal stress is carried out through antioxidant defense system, such as superoxide dismutases (SOD), catalases (CAT), glutathione peroxidases (GPX), peroxidase (POD), glutathione S-transferase (GST), glutathione reductase (GR), ascorbate peroxidase (APX), and glutathione (GSH), which can prevent the generation of free radicals and alleviate the oxidative damage to microalgae ( Dao et al, 2017 ; Marella et al, 2020 ; Zhang et al, 2021 ; Zeng et al, 2022 ). It was indicated that high concentrations of Cu 2+ and Cd 2+ exhibited inhibitory effect on Chlorella vulgaris and triggered the release of ROS, leading to a severe oxidative stress with the decrease in CAT and SOD activities ( Chen et al, 2016 ; Movafeghi et al, 2019 ).…”

“…As one of the most commonly used response surface methods (RSM), Box–Behnken design (BBD) is ideal for seeking the optimal conditions of adsorption process ( Moon et al, 2013 ; Mutalik et al, 2021 ; Pascual et al, 2022 ; Ramesh et al, 2023 ; Zhao et al, 2023 ). For instance, Zeng et al (2022) reported that the peak adsorption of Microcystis aeruginosa powder on Cu 2+ , Cd 2+ , and Ni + was 83.24, 92.00, and 88.67% under the initial concentration of Cu 2+ , Cd 2+ , and Ni + of 25 mg/L, 5 mg/L,and 15 mg/L, the temperature of 30°C, 35°C, pH value of 8, 8, and 7, and the adsorption time of 5 h, 4 h, and 1 h, respectively. Amjadi et al (2024) claimed that the maximum adsorption of lead was 98.69% by Haematococcus pluvialis under the optimal conditions of adsorbent dose of 1 g/L, lead concentration of 25 mg/L, pH of 6, temperature of 25°C, and exposure time of 120 min.…”

Bioremediation of n-alkanes, polycyclic aromatic hydrocarbons, and heavy metals from wastewater using seaweeds

“…Moreover, these techniques can be ineffectual when applied to low quantities of heavy metals because their effectiveness relies on concentration. (Shrestha et al 2021 ; Zeng et al 2022 ). Alternative methods to traditional ones for removing heavy metals from wastewater include biosorption.…”

Integrated Omics Approach to Discover Differences in the Metabolism of a New Tibetan Desmodesmus sp. in Two Types of Sewage Treatments

“…In recent years, it has been found that Desmodesmus sp. has a good absorption effect on nutrients (carbohydrate, nitrogen, phosphorus) in urban sewage [ 11 ], and it is also feasible to carry out the bioremediation of water polluted with excessive levels of heavy metals (copper and nickel) [ 12 ]. To better study the mechanisms of microalgae in treating different types of sewage, integrated omics research was employed, and the similarities and differences between microalgae in domestic sewage and industrial sewage treatments were studied at the molecular level [ 13 ].…”