New Prospects for Modified Algae in Heavy Metal Adsorption

Cheng, Sze Yin; Show, Pau Loke; Lau, Beng Fye; Chang, Jo Shu; Ling, Tau Chuan

doi:10.1016/j.tibtech.2019.04.007

Cited by 269 publications

(124 citation statements)

References 68 publications

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“…Macroalga biomass can potentially stabilise heavy metals due to their small uniform particle size and presence of different metal binding sites on their cell walls [26][27][28][29][30]. Red macroalgae (Gracilaria changii) are abundant in the coastal areas of Oceania, Africa, and Asia [31].…”

Section: Element Industriesmentioning

confidence: 99%

“…The criteria for selection of the ideal biosorbent should include its availability, non-toxicity, cost, metal-binding capacity, and regeneration [24]. Biosorbents that require minimal processing or are abundant in nature are considered low-cost materials [25].Macroalga biomass can potentially stabilise heavy metals due to their small uniform particle size and presence of different metal binding sites on their cell walls [26][27][28][29][30]. Red macroalgae (Gracilaria changii) are abundant in the coastal areas of Oceania, Africa, and Asia [31].…”

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confidence: 99%

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Optimisation and Modelling of Pb(II) and Cu(II) Biosorption onto Red Algae (Gracilaria changii) by Using Response Surface Methodology

Isam

Baloo

Kutty

et al. 2019

Water

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The removal of Pb (II) and Cu (II) ions by using marine red macroalgae (Gracilaria changii) as a biosorbent material was evaluated through the batch equilibrium technique. The effect of solution pH on the removal of metal ions was investigated within the range of 2–7. The response surface methodology (RSM) technique involving central composite design (CCD) was utilised to optimise the three main sorption parameters, namely initial metal ion concentration, contact time, and biosorbent dosage, to achieve maximum ion removal. The models’ adequacy of response was verified by ANOVA. The optimum conditions for removal of Pb (II) and Cu (II) were as follows: pH values of 4.5 and 5, initial concentrations of 40 mg/L, contact times of 115 and 45 min, and biosorbent dosage of 1 g/L, at which the maximum removal percentages were 96.3% and 44.77%, respectively. The results of the adsorption isotherm study showed that the data fitted well with the Langmuir’s model for Pb (II) and Cu (II). The results of the adsorption kinetic study showed that the data fitted well with the pseudo-second order model for Pb (II) and Cu (II). In conclusion, red alga biomass exhibits great potential as an efficient low-cost sorbent for removal of metal ions.

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Section: Element Industriesmentioning

confidence: 99%

mentioning

confidence: 99%

Optimisation and Modelling of Pb(II) and Cu(II) Biosorption onto Red Algae (Gracilaria changii) by Using Response Surface Methodology

Isam

Baloo

Kutty

et al. 2019

Water

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“…Xiong et al [25] has recently studied the practical feasibility of using microalgae to remove pharmaceutical contaminants [25]. Modified algae can also be applied for heavy metals removal [26]. Figure 4 shows the pollutants removal efficiencies of Chlorella sorokiniana CY-1 cultivated in glassmade vessel PBR and novel PBR.…”

Section: Comparison Between Glass-made Vessel and Novel-designed Photmentioning

confidence: 99%

Enhancing microalga Chlorella sorokiniana CY-1 biomass and lipid production in palm oil mill effluent (POME) using novel-designed photobioreactor

et al. 2019

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2020) Enhancing microalga Chlorellasorokiniana CY-1 biomass and lipid production in palm oil mill effluent (POME) using novel-designed photobioreactor, Bioengineered, 11:1, 61-69, ABSTRACT Chlorella sorokiniana CY-1 was cultivated using palm oil mill effluent (POME) in a novel-designed photobioreactor (NPBR) and glass-made vessel photobioreactor (PBR). The comparison was made on biomass and lipid productions, as well as its pollutants removal efficiencies. NPBR is transparent and is developed in thin flat panels with a high surface area per volume ratio. It is equipped with microbubbling and baffles retention, ensuring effective light and CO 2 utilization. The triangular shape of this reactor at the bottom serves to ease microalgae cell harvesting by sedimentation. Both biomass and lipid yields attained in NPBR were 2.3-2.9 folds higher than cultivated in PBR. The pollutants removal efficiencies achieved were 93.7% of chemical oxygen demand, 98.6% of total nitrogen and 96.0% of total phosphorus. Mathematical model revealed that effective light received and initial mass contributes toward successful microalgae cultivation. Overall, the results revealed the potential of NPBR integration in Chlorella sorokiniana CY-1 cultivation, with an aim to achieve greater feasibility in microalgal-based biofuel real application and for environmental sustainability. ARTICLE HISTORY

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“…Many natural strains of microalgae are able to tolerate high concentrations of metals and mediate metal biosorption, and a number of studies have examined the capabilities of live and dead microalgal biomass for metal removal from a contaminated water source (Ibuot, Gupta, Ansolia, & Bajhaiya, 2019;Mehta & Gaur, 2005;Monteiro, Castro, & Malcata, 2012;Urrutia, Yañez-Mansilla, & Jeison, 2019;Zeraatkar, Ahmadzadeh, Talebi, Moheimani, & McHenry, 2016). While such studies have demonstrated that the use of microalgal biomass for metal bioremediation is technically feasible, further improvements could be made by enhancing the selectivity and capacity of metal binding and accumulation by microalgae, which could be achieved through genetic engineering (Cheng, Show, Lau, Chang, & Ling, 2019).…”

Section: Introductionmentioning

confidence: 99%

Increased metal tolerance and bioaccumulation of zinc and cadmium in Chlamydomonas reinhardtii expressing a AtHMA4 C-terminal domain protein

Ibuot

Webster

Williams

et al. 2020

Preprint

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The use of microalgal biomass for metal pollutant bioremediation might be improved by genetic engineering to modify the selectivity or capacity of metal biosorption. A plant cadmium (Cd) and zinc (Zn) transporter (AtHMA4) was used as a transgene to increase the ability of Chlamydomonas reinhardtii to tolerate 0.2 mM Cd and 0.3 mM Zn exposure. The transgenic cells showed increased accumulation and internalisation of both metals compared to wild type. AtHMA4 was expressed either as the full-length protein or just the Cterminal tail, which is known to have metal binding sites. Similar Cd and Zn tolerance and accumulation was observed with expression of either the full-length protein or C-terminal domain, suggesting that enhanced metal tolerance was mainly due to increased metal binding rather than metal transport. The effectiveness of the transgenic cells was further examined by immobilisation in calcium alginate to generate microalgal beads that could be added to a metal contaminated solution. Immobilisation maintained metal tolerance, while AtHMA4-expressing cells in alginate showed a concentration-dependent increase in metal biosorption that was significantly greater than alginate beads composed of wild type cells.This demonstrates that expressing AtHMA4 full-length or C-terminus has great potential as a strategy for bioremediation using microalgal biomass.

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New Prospects for Modified Algae in Heavy Metal Adsorption

Cited by 269 publications

References 68 publications

Optimisation and Modelling of Pb(II) and Cu(II) Biosorption onto Red Algae (Gracilaria changii) by Using Response Surface Methodology

Optimisation and Modelling of Pb(II) and Cu(II) Biosorption onto Red Algae (Gracilaria changii) by Using Response Surface Methodology

Enhancing microalga Chlorella sorokiniana CY-1 biomass and lipid production in palm oil mill effluent (POME) using novel-designed photobioreactor

Increased metal tolerance and bioaccumulation of zinc and cadmium in Chlamydomonas reinhardtii expressing a AtHMA4 C-terminal domain protein

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