scholarly journals Innovative method for encapsulating highly pigmented biomass from Aspergillus nidulans mutant for copper ions removal and recovery

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0259315
Author(s):  
Ailton Guilherme Rissoni Toledo ◽  
Jazmina Carolina Reyes Andrade ◽  
Mauricio Cesar Palmieri ◽  
Denise Bevilaqua ◽  
Sandra Regina Pombeiro Sponchiado
Keyword(s):  
Heavy Metal ◽  
Aspergillus Nidulans ◽  
Fungal Biomass ◽  
Metal Removal ◽  
Copper Ions ◽  
Industrial Effluents ◽  
Cellulose Membrane ◽  
Copper Adsorption ◽  
Encapsulation Method ◽  
Removal And Recovery

Biosorption has been considered a promising technology for the treatment of industrial effluents containing heavy metals. However, the development of a cost-effective technique for biomass immobilization is essential for successful application of biosorption in industrial processes. In this study, a new method of reversible encapsulation of the highly pigmented biomass from Aspergillus nidulans mutant using semipermeable cellulose membrane was developed and the efficiency of the encapsulated biosorbent in the removal and recovery of copper ions was evaluated. Data analysis showed that the pseudo-second-order model better described copper adsorption by encapsulated biosorbent and a good correlation (r2 > 0.96) to the Langmuir isotherm was obtained. The maximum biosorption capacities for the encapsulated biosorbents were higher (333.5 and 116.1 mg g-1 for EB10 and EB30, respectively) than that for free biomass (92.0 mg g-1). SEM-EDXS and FT-IR analysis revealed that several functional groups on fungal biomass were involved in copper adsorption through ion-exchange mechanism. Sorption/desorption experiments showed that the metal recovery efficiency by encapsulated biosorbent remained constant at approximately 70% during five biosorption/desorption cycles. Therefore, this study demonstrated that the new encapsulation method of the fungal biomass using a semipermeable cellulose membrane is efficient for heavy metal ion removal and recovery from aqueous solutions in multiple adsorption-desorption cycles. In addition, this reversible encapsulation method has great potential for application in the treatment of heavy metal contaminated industrial effluents due to its low cost, the possibility of recovering adsorbed ions and the reuse of biosorbent in consecutive biosorption/desorption cycles with high efficiency of metal removal and recovery.

scholarly journals Properties of Cobalt- and Nickel-Doped Zif-8 Framework Materials and Their Application in Heavy-Metal Removal from Wastewater

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1636
Author(s):  
Bowen Shen ◽  
Bixuan Wang ◽  
Liying Zhu ◽  
Ling Jiang
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Copper Ions ◽  
Heavy Metal Removal ◽  
Nickel Ions ◽  
Cobalt Ions ◽  
Framework Materials ◽  
Metal Treatment ◽  
Dichromate Ions ◽  
Cobalt And Nickel

Heterometallic zeolite imidazole framework materials (ZIF) exhibit highly attractive properties and have drawn increased attention. In this study, a petal-like zinc based ZIF-8 crystal and materials doped with cobalt and nickel ions were efficiently prepared in an aqueous solution at room temperature. It was observed that doped cobalt and nickel had obviously different effects on the morphology of ZIF-8. Cobalt ions were beneficial for the formation of ZIF-8, while addition of nickel ions tended to destroy the original configuration. Then we compared the absorption ability for metal ions between petal-like ZIF-8 and its doped derivatives with anion dichromate ions (Cr2O72−) and cation copper ions (Cu2+) as the absorbates. Results indicated that saturated adsorption capacities of Co@ZIF-8 and Ni@ZIF-8 for Cr2O72− reach 43.00 and 51.60 mg/g, while they are 1191.67 and 1066.67 mg/g for Cu2+, respectively, which are much higher than the original ZIF-8 materials. Furthermore, both the heterometallic ZIF-8 materials show fast adsorption kinetics to reach adsorption equilibrium. Therefore, petal-like ZIF-8 with doped ions can be produced through a facile method and can be an excellent candidate for further applications in heavy-metal treatment.

scholarly journals The green, ultrafine cellulose-based porous nanofibrous membranes for efficient heavy metal ion removal through incorporation of chitosan by various electrospinning ways

2022 ◽  
Author(s):  
Qiushi Li ◽  
Ganmao Su ◽  
Ronggang Luo ◽  
Guanben Du ◽  
Linkun Xie ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Active Sites ◽  
Metal Removal ◽  
Copper Ions ◽  
Core Shell ◽  
Adsorption Effect ◽  
Adsorption Sites ◽  
Adsorption Performance ◽  
The Core ◽  
Nanofibrous Membranes

Abstract The rapid global industrialization worsens the contamination of heavy metals in aquatic ecosystems on the earth. In this study, the green, ultrafine cellulose-based porous nanofibrous membranes for efficient heavy metal removal through incorporation of chitosan by the conventional and core-shell electrospinning ways were firstly obtained. The relations among parameters of electrospun solution, micro-morphology and porosity for nanofibers, the variation of chemical active sites and adsorption performance of biocomposite nanofibrous membranes for conventional and core-shell electrospinning as well as the adsorption effect factors of copper ions including initial concentration, pH of solution and interaction time were comprehensively investigated. The results show that the average diameter for conventional and core-shell ultrafine nanofibers at 50% chitosan and 30% chitosan loading can achieve 56.22 nm and 37.28 nm, respectively. The core-shell cellulose acetate/chitosan (CA/CS) biocomposite nanofibrous membranes induced the surface aggregation of copper ions to impede the further adsorption. The more uniform distribution for chemical adsorption sites can be obtained by the conventional single-nozzle electrospinning than by the core-shell one, which promotes the adsorption performance of copper ions and decreases the surface shrinkage of nanofibrous membranes during adsorption. The 30% CS conventional nanofibrous membranes at the pH=5 aqueous solution showed the optimum adsorption capacity of copper ions (86.4 mg/g). The smart combination of renewable biomass with effective chemical adsorptive sites, the electrospinning technology with interwoven porous structure and the adsorption method with low cost and facile operation shows a promising prospect for water treatment.

Bioelectrochemical Systems for Heavy Metal Removal and Recovery

2017 ◽  
pp. 165-198 ◽  
Author(s):  
Jampala Annie Modestra ◽  
Gokuladoss Velvizhi ◽  
Kamaja Vamshi Krishna ◽  
Kotakonda Arunasri ◽  
Piet N. L. Lens ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Bioelectrochemical Systems ◽  
Removal And Recovery

Sequential removal and recovery of cadmium ions (Cd2+) using photocatalysis and reduction crystallization from aqueous phase

2021 ◽  
Author(s):  
Vivek Kumar ◽  
Ravinder Kumar Wanchoo ◽  
Amrit Pal Toor
Keyword(s):  
Heavy Metal ◽  
Aqueous Phase ◽  
Industrial Effluents ◽  
Toxic Heavy Metal ◽  
Cadmium Ions ◽  
Living Organisms ◽  
Removal And Recovery

The toxic heavy metal cadmium (Cd) present in wastewater from chemical and industrial effluents shows persistence in aquatic media because of its non-degradability and is harmful to living organisms. A...

Comparative study on heavy metal removal from industrial effluents by various separation methods

2011 ◽  
Vol 35 (1-3) ◽  
pp. 242-246 ◽  
Author(s):  
Dóra Németh ◽  
Jalel Labidi ◽  
László Gubicza ◽  
Katalin Bélafi-Bakó
Keyword(s):  
Heavy Metal ◽  
Comparative Study ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Industrial Effluents
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