Cellular responses and phenol bioremoval by green alga Scenedesmus abundans: Equilibrium, kinetic and thermodynamic studies

Fawzy, Mustafa A.; Alharthi, Sarah

doi:10.1016/j.eti.2021.101463

Cited by 28 publications

(21 citation statements)

References 73 publications

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“…The intercept was high ( C i , 8.6 and 10.1 mg/g for the freely suspended and immobilized T. ornata biomasses, respectively), which might be attributable to an increased boundary layer thickness, reduced external mass transfer and increased internal mass transfer 45 .…”

Section: Resultsmentioning

confidence: 95%

“…The mean biosorption energy ( E , kJ mol −1 ) reflects the physical or chemical biosorption process. If the E value is lower than 8 kJ mol −1 , the biosorption process occurs physically, and if the value varies between 8 and 16 kJ mol −1 , the process occurs chemically 45 , 46 . Since the E value was greater than 8 kJ mol −1 (Table 2 ), it was hypothesized that Cd 2+ biosorption onto the free and immobilized T. ornata biomasses was accomplished via a chemisorption process.…”

Section: Resultsmentioning

confidence: 99%

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Process optimization and modeling of Cd2+ biosorption onto the free and immobilized Turbinaria ornata using Box–Behnken experimental design

Fawzy

Darwish

Alharthi

et al. 2022

Sci Rep

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The release of effluents containing cadmium ions into aquatic ecosystems is hazardous to humans and marine organisms. In the current investigation, biosorption of Cd2+ ions from aqueous solutions by freely suspended and immobilized Turbinaria ornata biomasses was studied. Compared to free cells (94.34%), the maximum Cd2+ removal efficiency reached 98.65% for immobilized cells obtained via Box–Behnken design under optimized conditions comprising algal doses of 5.04 g L−1 and 4.96 g L−1, pH values of 5.06 and 6.84, and initial cadmium concentrations of 25.2 mg L−1 and 26.19 mg L−1, respectively. Langmuir, Freundlich, and Temkin isotherm models were suitably applied, providing the best suit of data for free and immobilized cells, but the Dubinin–Radushkevich model only matched the immobilized algal biomass. The maximum biosorption capacity of Cd2+ ions increased with the immobilized cells (29.6 mg g−1) compared to free cells (23.9 mg g−1). The Cd2+ biosorption data obtained for both biomasses followed pseudo-second-order and Elovich kinetic models. In addition, the biosorption process is controlled by film diffusion followed by intra-particle diffusion. Cd2+ biosorption onto the free and immobilized biomasses was spontaneous, feasible, and endothermic in nature, according to the determined thermodynamic parameters. The algal biomass was further examined via SEM/EDX and FTIR before and after Cd2+ biosorption. SEM/EDX analysis revealed Cd2+ ion binding onto the algal surface. Additionally, FTIR analysis confirmed the presence of numerous functional groups (hydroxyl, carboxyl, amine, phosphate, etc.) participating in Cd2+ biosorption. This study verified that immobilized algal biomasses constitute a cost-effective and favorable biosorbent material for heavy metal removal from ecosystems.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Process optimization and modeling of Cd2+ biosorption onto the free and immobilized Turbinaria ornata using Box–Behnken experimental design

Fawzy

Darwish

Alharthi

et al. 2022

Sci Rep

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“…The rate of adsorption and desorption are now in dynamic equilibrium, and no biosorption progress was seen after this optimal equilibrium duration 24 . Because copper ions came in contact with unoccupied surface biosorption sites, biosorption of copper was initially quicker; however, as the equilibrium reached 90 minutes, the biosorption sites became saturated, and no further biosorption was allowed 25 .…”

Section: Kinetic Modelsmentioning

confidence: 99%

“…Physical sorption is defined as a value of E less than 8 kJ/mol, whereas chemical sorption is defined as a value of 8 to 16 kJ/mol 25 . The value of E (9.13 k/J mol)…”

Section: Dubinin-radushkevich Model (D-r)mentioning

confidence: 99%

Kinetic, isotherm and thermodynamic aspects of Cu2+ biosorption onto Rosa damascena leaf as a low-cost biosorbent: Optimization of process variables by Response Surface Methodology

Fawzy

Al-Yasi

Galal

et al. 2021

Preprint

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In this study, the Rosa damascena leaf powder was evaluated as a biosorbent for copper removal from aqueous solutions. Optimized conditions of 4.0 g/L biosorbent dosage, pH of 5.5 and initial copper concentration of 55 mg/L obtained by Response Surface Methodology were employed for Cu2+ biosorption by R. damascena leaves and up to 88.7 % Cu2+ was removed. The biosorption data were well ﬁtted to the pseudo-second order and Elovich kinetic models. The Langmuir and Dubinin-Radushkevich isotherm models were also best fit the experimental data showing monolayer isotherm with qmax value of 25.13 mg/g obtained at optimum conditions. Thermodynamic parameters showed the spontaneity, feasibility and exothermic nature of adsorption. Scanning electron microscopy, Energy-Dispersive X-Ray, and Fourier transform infrared spectroscopy were used to characterize the biosorbent before and after Cu2+ biosorption, revealing outstanding structural characteristics and high surface functional groups availability. In addition, immobilized R. damascena leaves adsorbed 90.7 % of copper from aqueous solution, which is greater than free biosorbent (85.3 %). It can be concluded that R. damascena might be employed as a low-cost biosorbent for removing heavy metals from aqueous solutions.

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“…Phenol can be degraded by various strains under aerobic and anaerobic conditions. Phenol-degrading strains mainly found in soil or activated sludge processes include Rhodococcus, Mycobacterium, Flavobacterium, Rhodococcus chlorophenolicus, Pseudomonas putida, Pseudomonas, Pikettii, Cryptococcus elinovi, Phanerochaete chrysosporium, Bacillus stearothermophilus, Coprinus cinereus, Alcaligenes sp., Acinetobacter sp., and green alga Scenedesmus abundans [2,3,6,7]. The decomposition of organic substances by microorganisms is achieved by oxidation-reduction reactions of enzymes present in the bacterial body, and these microorganisms are reported to be capable of organic decomposition with or without halogen [8].…”

Section: Introductionmentioning

confidence: 99%

Additive inhibitory effects of heavy metals on phenol-utilizing microorganism

Batkhuyag

Matyakubov

Mang

et al. 2021

Environmental Engineering Research

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Effects of heavy metals on phenol-utilizing microorganisms that could co-metabolically degrade naphthol were investigated. Polymerase chain reaction (PCR) and denaturing gradient gel electrophoresis (DGGE) identified these phenol-utilizing microorganisms as Alicycliphilus denitrificans K601, Alicycliphilus sp. R-2461, uncultured Alicycliphilus sp., and Acidovorax aerodenitrificans. Inhibitory effects of Pb, Cu, Cd, and Zn on phenol biodegradation were in the order of Cu > Cd > Pb > Zn. Inhibitory effects of mixed heavy metals on phenolutilizing microorganisms were in the order of (Cd + Pb) ≈ (Cd + Cu) > (Zn + Pb) > (Zn + Cd) > (Pb + Cu) > (Zn + Cu). The presence of mixed heavy metals synergistically inhibited microbial degradation of phenol. The relationship between reaction constants and inhibition concentrations that caused 50% of the degradation rate (IC 50 ) for mixed heavy metals was derived as k 2 = 0.69 • IC 50 -1.007 . In this study, heavy metals inhibited phenol biodegradation through synergistic interactions. However, other studies have reported antagonistic interactions depending on the microbial community and heavy metals, indicating that the inhibition type of heavy metal on microbial degradation depends on the microorganism and the type of heavy metal.

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Cellular responses and phenol bioremoval by green alga Scenedesmus abundans: Equilibrium, kinetic and thermodynamic studies

Cited by 28 publications

References 73 publications

Process optimization and modeling of Cd2+ biosorption onto the free and immobilized Turbinaria ornata using Box–Behnken experimental design

Process optimization and modeling of Cd2+ biosorption onto the free and immobilized Turbinaria ornata using Box–Behnken experimental design

Kinetic, isotherm and thermodynamic aspects of Cu2+ biosorption onto Rosa damascena leaf as a low-cost biosorbent: Optimization of process variables by Response Surface Methodology

Additive inhibitory effects of heavy metals on phenol-utilizing microorganism

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