Preparation of laccase-graphene oxide nanosheet/alginate composite: Application for the removal of cetirizine from aqueous solution

Sharifi‐Bonab, Mina; Rad, Farzad Arjomandi; Talat-Mehrabad, Jila

doi:10.1016/j.jece.2016.06.012

Cited by 26 publications

(9 citation statements)

References 37 publications

(20 reference statements)

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“…While production of reusable nanomaterial can reduce the overall cost, the strong electrostatic interactions of the material might influence the adsorption/desorption equilibrium and also influence its reusability making this nanomaterial inefficient for reuse. 68 For example, long washing process periods 69 and variation in the pH 46,70 need to be performed to remove the CEC. Thus, making large-scale production, high cost, and reusability some of the unresolved problems associated with GO and GO-based nanomaterials, which can hinder their use in environmental pollution management.…”

Section: Technological Advancementsmentioning

confidence: 99%

“…46 Furthermore, a laccase-GO/alginate composite was used to remove cetirizine from solution where the material was washed with distilled water and acetate buffer after each removal experiment to recycle the adsorbent, and demonstrated a 23% reduction from the original 98% in cetirizine removal after four cycles. 69 Adsorbents can also be modified with catalysts or photocatalysts to increase their removal capacity. Modification of graphene with catalysts, for instance, can make the sorption process easier and faster since CEC degradation will occur.…”

Section: Technological Advancementsmentioning

confidence: 99%

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Nano-based adsorbent and photocatalyst use for pharmaceutical contaminant removal during indirect potable water reuse

et al. 2020

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Increasing human activity, including commercial and noncommercial use of pharmaceuticals, personal care products, and agricultural products, has introduced new contaminants that can be challenging to remove with currently available technologies. Pharmaceuticals, in particular, can be especially challenging to remove from the water supply and can pose great harm to people and local ecosystems. Their highly stable nature makes their degradation with conventional water treatment techniques difficult, and studies have shown that even advanced treatment of water is unable to remove some compounds. As such, decontamination of water from pharmaceuticals requires the development of advanced technologies capable of being used in indirect and direct potable water reuse. In this review, we discuss pharmaceutical removal in indirect potable water treatment and how recent advancements in adsorption and photocatalysis technologies can be used for the decontamination of pharmaceutical-based emerging contaminants. For instance, new materials that incorporate graphene-based nanomaterials have been developed and shown to have increased adsorptive capabilities toward pharmaceuticals when compared with unmodified graphene. In addition, adsorbents have been incorporated in membrane technologies, and photocatalysts have been combined with magnetic material and coated on optical fibers improving their usability in water treatment. Advancements in photocatalytic material research have enabled the development of highly effective materials capable of degradation of a variety of pharmaceutical compounds and the development of visible-light photocatalysts. To understand how adsorbents and photocatalysts can be utilized in water treatment, we address the benefits and limitations associated with these technologies and their potential applicability in indirect potable water reuse plants.

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Section: Technological Advancementsmentioning

confidence: 99%

Section: Technological Advancementsmentioning

confidence: 99%

Nano-based adsorbent and photocatalyst use for pharmaceutical contaminant removal during indirect potable water reuse

et al. 2020

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“…Moreover, a peak attributed to O-H bending can be seen at 1630 cm −1 . The peak at 1735 cm −1 was assigned to the stretching vibration of C=O bonds in carboxylic acid [36]. Finally, a peak was also observed at 1050 cm −1 in graphite oxide samples, which was related to the stretching vibration of C-O-C [25].…”

Section: Oxidation Processmentioning

confidence: 86%

“…The TG curve of GO showed that the thermal degradation process was carried out in three steps. In the first step, occurring between 25 • C and 100 • C, the mass loss was associated with the evaporation of water trapped between GO flakes [36]. The second step occurred between 230 • C and 260 • C and was related to the decomposition of the less stable oxygen-containing functional groups [36].…”

Section: Nanocompositesmentioning

confidence: 99%

“…In the first step, occurring between 25 • C and 100 • C, the mass loss was associated with the evaporation of water trapped between GO flakes [36]. The second step occurred between 230 • C and 260 • C and was related to the decomposition of the less stable oxygen-containing functional groups [36]. Finally, the slow mass loss observed from 260 • C was related to the more stable functional groups present in the graphene oxide, giving place to a high amount of residue [49].…”

Section: Nanocompositesmentioning

confidence: 99%

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Influence of Process Parameters in Graphene Oxide Obtention on the Properties of Mechanically Strong Alginate Nanocomposites

et al. 2020

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Sodium alginate, a biopolymer extracted from brown algae, has shown great potential for many applications, mainly due to its remarkable biocompatibility and biodegradability. To broaden its fields of applications and improve material characteristics, the use of nanoreinforcements to prepare nanocomposites with enhanced properties, such as carbonaceous structures which could improve thermal and mechanical behavior and confer new functionalities, is being studied. In this work, graphene oxide was obtained from graphite by using modified Hummers' method and exfoliation was assisted by sonication and centrifugation, and it was later used to prepare sodium alginate/graphene oxide nanocomposites. The effect that different variables, during preparation of graphene oxide, have on the final properties has been studied. Longer oxidation times showed higher degrees of oxidation and thus larger amount of oxygen-containing groups in the structure, whereas longer sonication times and higher centrifugation rates showed more exfoliated graphene sheets with lower sizes. The addition of graphene oxide to a biopolymeric matrix was also studied, considering the effect of processing and content of reinforcement on the material. Materials with reinforcement size-dependent properties were observed, showing nanocomposites with large flake sizes, better thermal stability, and more enhanced mechanical properties, reaching an improvement of 65.3% and 83.3% for tensile strength and Young's modulus, respectively, for a composite containing 8 wt % of graphene oxide.

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Immobilized fungal consortium‐GR: a novel textile effluent treatment alternative for removal of azo dyes and other pollutants

Sen¹,

Das

Rajhans

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Cleaning up the environment by the elimination of harmful contaminants from textile effluents (TE) is a critical and challenging crisis that requires long-term appropriate solutions. In this work, a fungal consortium-GR containing two fungi Geotrichum candidum F4 and Rhodotorula glutinis F7, in the ratio 1:1, is demonstrated to treat the organic contaminants in TEs. RESULTS:The immobilized consortium-GR in coconut fibre is 24% more efficient at treating TE than free consortium-GR, showing a maximum decolorization of 88.4% in 6 h immersion, at optimal conditions of pH 5.5, temperature 35°C, inoculum size 5% and fibre quantity 2.5 g L −1 . Biodegradation was confirmed by using UV-visible spectrophotometry, high-performance liquid chromatography and Fourier transform infrared spectroscopy, and the degradation pathway of methyl orange was confirmed by gas chromatography-mass spectroscopy study. The novel immobilized consortium-GR in the bioreactor was assessed by the reduction of toxic parameters in 6 h: colour by 70%, total dissolved solids by 62%, total suspended solids by 81%, biological oxygen demand by 51%, chemical oxygen demand by 58%, chloride by 78%, ammonia by 64%, sulfate by 55%, lead by 12.5% and chromium by 75%. During this process of bioconversion, maximum laccase activity of 3.25 U L −1 was observed in 6 h by immobilized consortium-GR. Phytotoxicity and genotoxicity studies revealed the detoxification of TE. CONCLUSION: Through the continuous reuse of treated water in subsequent dyeings, the proposed TE treatment process represented a 92.86% reduction in water use and a total cost reduction of 22.47%.This study is a step towards upcoming onsite, field and short-term applications of consortium-GR for the management of TE.

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Preparation of laccase-graphene oxide nanosheet/alginate composite: Application for the removal of cetirizine from aqueous solution

Cited by 26 publications

References 37 publications

Nano-based adsorbent and photocatalyst use for pharmaceutical contaminant removal during indirect potable water reuse

Nano-based adsorbent and photocatalyst use for pharmaceutical contaminant removal during indirect potable water reuse

Influence of Process Parameters in Graphene Oxide Obtention on the Properties of Mechanically Strong Alginate Nanocomposites

Immobilized fungal consortium‐GR: a novel textile effluent treatment alternative for removal of azo dyes and other pollutants

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