Cellulose-metallothionein biosorbent for removal of Pb(II) and Zn(II) from polluted water

Mwandira, Wilson; Nakashima, Kazunori; Togo, Yuki; Satō, Tsutomu; Kawasaki, Satoru

doi:10.1016/j.chemosphere.2019.125733

Cited by 45 publications

(16 citation statements)

References 18 publications

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“…Hence, the adsorption mechanism in the Langmuir model suggested that the adsorption sites on the adsorbent (PKM-2 M. oleifera leaves) are homogeneous, and no interaction between the adjacent sites occurs. 24 Similar results were reported for other adsorbents. 11,13 When compared to other biosorbents (Table 7), Pb(II) and Zn(II) metals had the highest adsorption capacity q m of 51.71 and 38.50 mg/g, respectively, with PKM-2 M. oleifera leaves.…”

Section: Model Confirmation and Validationsupporting

confidence: 81%

Central Composite Design for Adsorption of Pb(II) and Zn(II) Metals on PKM-2 Moringa oleifera Leaves

Jayan

Akbar

2021

ACS Omega

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Biosorption is a very effective technique to eliminate the heavy metals present in the wastewater that utilize nongrowing biomass. The adsorption ability of the Periyakulam-2 (PKM-2) variety of Moringa Oleifera leaves (MOLs) to eliminate Pb(II) and Zn(II) ions from an aqueous solution was examined in this work. Fourier transform infrared (FTIR) spectroscopy, field-emission scanning electron microscopy, energy-dispersive X-ray (EDX) analysis, X-ray powder diffraction, and Brunauer–Emmett–Teller methods were used to characterize the PKM-2 variety of MOLs. The set of variables consists of the metal ion initial concentration, a dosage of the adsorbent, and pH were optimized with the help of the response surface methodology to get maximum metal removal efficiency of lead and zinc metals using the PKM-2 MOL biosorbent. A maximum Pb(II) removal of 95.6% was obtained under the condition of initial concentration of metal ions 38 mg/L, a dosage of the adsorbent 1.5 g, and pH 4.7, and a maximum zinc removal of 89.35% was obtained under the condition of initial concentration of metal ions 70 mg/L, a dosage of the adsorbent 0.6 g, and pH 3.2. The presence of lead and zinc ions on the biosorbent surface and the functional groups involved in the adsorption process were revealed using EDX and FTIR analysis, respectively. The adsorption data were evaluated by employing different isotherm and kinetic models. Among the isotherm models, Langmuir’s isotherm showed that the best fit and maximum adsorption capacities are 51.71 and 38.50 mg/g for lead and zinc, respectively. Kinetic studies showed accordance with the pseudo-second-order model to lead and zinc metal adsorption. Thermodynamic parameters confirmed (ΔG° < 0, ΔH° < 0, and ΔS° > 0) that the sorption mechanism is physisorption, exothermic, spontaneous, and favorable for adsorption. The results from this study show that the MOL of the PKM-2 type is a promising alternative for an ecofriendly, low-cost biosorbent that can effectively remove lead and zinc metals from aqueous solutions.

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Section: Model Confirmation and Validationsupporting

confidence: 81%

Central Composite Design for Adsorption of Pb(II) and Zn(II) Metals on PKM-2 Moringa oleifera Leaves

Jayan

Akbar

2021

ACS Omega

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“…The CBM used for this study belongs to Family 3, which shows the affinity on noncrystalline cellulose and crystalline cellulose . The same CBM fused with metal-binding proteins and peptides has been successfully immobilized on the cellulose material in recent studies. , Figure shows the time course of adsorption of proteins on cellulose. ProS2-Sil-CBM showed a 98% adsorption on cellulose within 1.5 h, confirming that it can rapidly bind to cellulose.…”

Section: Resultsmentioning

confidence: 99%

Biological Route to Fabricate Silica on Cellulose Using Immobilized Silicatein Fused with a Carbohydrate-Binding Module

et al. 2020

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Silicatein is an enzyme capable of catalyzing silica formation under mild conditions and is a promising catalyst for the fabrication of biohybrid materials. However, unfavorable aggregation of silicatein makes it unsuitable for use in material fabrication. In this study, a soluble protein tag (ProS2) and a carbohydrate-binding module (CBM) were used to develop a soluble and cellulose-binding fusion silicatein, ProS2-Sil-CBM, which can be efficiently immobilized on cellulose to form silica on it. ProS2-Sil-CBM was soluble in aqueous media and strongly bound to cellulose. ProS2-Sil-CBM bound on cellulose catalyzed the formation of a silica layer on the cellulose in the presence of tetraethyl orthosilicate as the substrate. Scanning electron microscopy (SEM) and surface elemental analysis confirmed the formation of silica on cellulose. This technique can be used to fabricate inorganic–organic hybrid materials to immobilize biomolecules and can be applied to develop novel biocatalytic systems, biosensors, and tissue culture scaffolds.

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“…In contrast, Sauge-Merle et al ( 2012) found greater bioaccumulation rates in E. coli overexpressing MT fusion proteins in the periplasm only for copper, whereas cadmium, arsenic, mercury, and zinc were better adsorbed by recombinant E. coli with MT fusion proteins targeted toward the cytosol. A recent study expressed MT fusion proteins in E. coli and extracted the resulting proteins to make a biosorbent used for the removal of lead and zinc (Mwandira et al, 2020).…”

Section: Challenges For Genetic Engineeringmentioning

confidence: 99%

Microalgal Metallothioneins and Phytochelatins and Their Potential Use in Bioremediation

et al. 2020

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The persistence of heavy metals (HMs) in the environment causes adverse effects to all living organisms; HMs accumulate along the food chain affecting different levels of biological organizations, from cells to tissues. HMs enter cells through transporter proteins and can bind to enzymes and nucleic acids interfering with their functioning. Strategies used by microalgae to minimize HM toxicity include the biosynthesis of metal-binding peptides that chelate metal cations inhibiting their activity. Metalbinding peptides include genetically encoded metallothioneins (MTs) and enzymatically produced phytochelatins (PCs). A number of techniques, including genetic engineering, focus on increasing the biosynthesis of MTs and PCs in microalgae. The present review reports the current knowledge on microalgal MTs and PCs and describes the state of art of their use for HM bioremediation and other putative biotechnological applications, also emphasizing on techniques aimed at increasing the cellular concentrations of MTs and PCs. In spite of the broad metabolic and chemical diversity of microalgae that are currently receiving increasing attention by biotechnological research, knowledge on MTs and PCs from these organisms is still limited to date.

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Cellulose-metallothionein biosorbent for removal of Pb(II) and Zn(II) from polluted water

Cited by 45 publications

References 18 publications

Central Composite Design for Adsorption of Pb(II) and Zn(II) Metals on PKM-2 Moringa oleifera Leaves

Central Composite Design for Adsorption of Pb(II) and Zn(II) Metals on PKM-2 Moringa oleifera Leaves

Biological Route to Fabricate Silica on Cellulose Using Immobilized Silicatein Fused with a Carbohydrate-Binding Module

Microalgal Metallothioneins and Phytochelatins and Their Potential Use in Bioremediation

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