Contrasting effects of a novel biochar-microalgae complex on arsenic and mercury removal

Jiang, Xiyan; Shu-xi, Zhang; Yin, Xixiang; Tian, Yong Lan; Liu, Yuanyuan; Deng, Zhiwen; Wang, Lihong

doi:10.1016/j.ecoenv.2023.115144

Cited by 3 publications

(1 citation statement)

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“…It is noteworthy that polysaccharides, proteins, lipids, and nucleic acids are composed of multiple functional groups on the surface of plants or algae, especially hydroxyl, carboxylate, phosphate, and amino group for metal ion adsorption via binding to cations, and the mechanism of adsorption may be mediated by ion-exchange, complexation, chelation, and coordination ( Shen et al, 2018 ; Jiang et al, 2023 ). To detect the differences that different metal ions interact with functional groups of cellular membrane, FTIR spectroscopy was used to analyze the absorption mechanism of D. salina before and after copper, lead, and cadmium exposure.…”

Section: Resultsmentioning

confidence: 99%

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

Gao,

Ling,

Tian

et al. 2024

Front. Microbiol.

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BackgroundHeavy metal pollution has become a global problem, which urgently needed to be solved owing to its severe threat to water ecosystems and human health. Thus, the exploration and development of a simple, cost-effective and environmental-friendly technique to remove metal elements from contaminated water is of great importance. Algae are a kind of photosynthetic autotroph and exhibit excellent bioadsorption capacities, making them suitable for wastewater treatment.MethodsThe effects of heavy metals (copper, lead and cadmium) on the growth, biomolecules accumulation, metabolic responses and antioxidant response of Dunaliella salina were investigated. Moreover, the Box-Behnken design (BBD) in response surface methodology (RSM) was used to optimize the biosorption capacity, and FT-IR was performed to explore the biosorption mechanism of D. salina on multiple heavy metals.ResultsThe growth of D. salina cells was significantly inhibited and the contents of intracellular photosynthetic pigments, polysaccharides and proteins were obviously reduced under different concentrations of Cu2+, Pb2+ and Cd2+, and the EC50 values were 18.14 mg/L, 160.37 mg/L and 3.32 mg/L at 72 h, respectively. Besides, the activities of antioxidant enzyme SOD and CAT in D. salina first increased, and then descended with increasing concentration of three metal ions, while MDA contents elevated continuously. Moreover, D. salina exhibited an excellent removal efficacy on three heavy metals. BBD assay revealed that the maximal removal rates for Cu2+, Pb2+, and Cd2+ were 88.9%, 87.2% and 72.9%, respectively under optimal adsorption conditions of pH 5-6, temperature 20-30°C, and adsorption time 6 h. Both surface biosorption and intracellular bioaccumulation mechanisms are involved in metal ions removal of D. salina. FT-IR spectrum exhibited the main functional groups including carboxyl (-COOH), hydroxyl (-OH), amino (-NH2), phosphate (-P=O) and sulfate (-S=O) are closely associated with the biosorption or removal of heavy metalsions.DiscussionAttributing to the brilliant biosorption capacity, Dunaliella salina may be developed to be an excellent adsorbent for heavy metals.

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Section: Resultsmentioning

confidence: 99%