Expression of concern: Investigation of the biological activity, mechanical properties and wound healing application of a novel scaffold based on lignin-agarose hydrogel and silk fibroin embedded zinc chromite nanoparticles.

Expression of concern for 'Investigation of the biological activity, mechanical properties and wound healing application of a novel scaffold based on lignin-agarose hydrogel and silk fibroin embedded zinc chromite nanoparticles' by Reza Eivazzadeh-Keihan , , 2021, , 17914-17923, https://doi.org/10.1039/D1RA01300A.

Retraction notice to "Biogenic synthesis and cytotoxic effects of silver nanoparticles mediated by white rot fungi" [Heliyon 7 (2021) e06470].

[This retracts the article DOI: 10.1016/j.heliyon.

Expression of concern: Acceleration of ammonium phosphate hydrolysis using TiO microspheres as a catalyst for hydrogen production.

Expression of concern for 'Acceleration of ammonium phosphate hydrolysis using TiO microspheres as a catalyst for hydrogen production' by Ayman H. Zaki , , 2020, , 2080-2086, https://doi.org/10.

Expression of concern: Facile route to synthesize FeO@acacia-SOH nanocomposite as a heterogeneous magnetic system for catalytic applications.

Expression of concern for 'Facile route to synthesize FeO@acacia-SOH nanocomposite as a heterogeneous magnetic system for catalytic applications' by Reza Taheri-Ledari , , 2020, , 40055-40067, https://doi.org/10.1039/D0RA07986C.

Expression of concern: Highly porous copper-supported magnetic nanocatalysts: made of volcanic pumice textured by cellulose and applied for the reduction of nitrobenzene derivatives.

Expression of concern for 'Highly porous copper-supported magnetic nanocatalysts: made of volcanic pumice textured by cellulose and applied for the reduction of nitrobenzene derivatives' by Reza Taheri-Ledari , , 2021, , 25284-25295, https://doi.org/10.1039/D1RA03538J.

Expression of concern: Tin-zinc-oxide nanocomposites (SZO) as promising electron transport layers for efficient and stable perovskite solar cells.

Expression of concern for 'Tin-zinc-oxide nanocomposites (SZO) as promising electron transport layers for efficient and stable perovskite solar cells' by Ahmed E. Shalan , , 2019, , 2654-2662, DOI: https://doi.org/10.

Expression of Concern: The controlled synthesis and DFT investigation of novel (0D)-(3D) ZnS/SiO heterostructures for photocatalytic applications.

Expression of Concern for 'The controlled synthesis and DFT investigation of novel (0D)-(3D) ZnS/SiO heterostructures for photocatalytic applications' by Mohamed F. Sanad , , 2021, , 22352-22364, https://doi.org/10.

Expression of Concern: Statistical optimization of photo-induced biofabrication of silver nanoparticles using the cell extract of : insight on characterization and antioxidant potentiality.

Expression of Concern for 'Statistical optimization of photo-induced biofabrication of silver nanoparticles using the cell extract of : insight on characterization and antioxidant potentiality' by Rasha A. Abo-Elmagd , ., 2020, , 44232-44246, DOI: https://doi.

Expression of concern: Synthesis and characterization of a new ZIF-67@MgAlO nanocomposite and its adsorption behaviour.

Expression of concern for 'Synthesis and characterization of a new ZIF-67@MgAlO nanocomposite and its adsorption behaviour' by Mehdi Davoodi , , 2021, , 13245-13255, https://doi.org/10.1039/D1RA01056E.

Expression of Concern: Solid-state dye-sensitized solar cells based on ZnSnO nanocomposite photoanodes.

Expression of Concern for 'Solid-state dye-sensitized solar cells based on ZnSnO nanocomposite photoanodes' by Ayat Nasr El-Shazly , , 2018,, 24059-24067, DOI: https://doi.org/10.1039/c8ra02852d.

Expression of concern: Versatile plasmonic-effects at the interface of inverted perovskite solar cells.

Expression of concern for 'Versatile plasmonic-effects at the interface of inverted perovskite solar cells' by Ahmed Esmail Shalan, , , 2017, , 1229-1236, https://doi.org/10.1039/C6NR06741G.

Expression of Concern: Concordantly fabricated heterojunction ZnO-TiO nanocomposite electrodes a co-precipitation method for efficient stable quasi-solid-state dye-sensitized solar cells.

Expression of concern for 'Concordantly fabricated heterojunction ZnO-TiO nanocomposite electrodes a co-precipitation method for efficient stable quasi-solid-state dye-sensitized solar cells' by Ahmed Esmail Shalan , , 2015, , 103095-103104, DOI: 10.1039/C5RA21822E.

Expression of concern: Cobalt metal-organic framework-based ZIF-67 for the trace determination of herbicide molinate by ion mobility spectrometry: investigation of different morphologies.

Expression of concern for 'Cobalt metal-organic framework-based ZIF-67 for the trace determination of herbicide molinate by ion mobility spectrometry: investigation of different morphologies' by Mehdi Davoodi , , 2021, , 2643-2655, DOI: https://doi.org/10.1039/D0RA09298C.

Retraction to "Silver-Doped Cadmium Selenide/Graphene Oxide-Filled Cellulose Acetate Nanocomposites for Photocatalytic Degradation of Malachite Green toward Wastewater Treatment".

[This retracts the article DOI: 10.1021/acsomega.1c02667.

Correction to "Silver-Doped Cadmium Selenide/Graphene Oxide-Filled Cellulose Acetate Nanocomposites for Photocatalytic Degradation of Malachite Green toward Wastewater Treatment".

[This corrects the article DOI: 10.1021/acsomega.1c02667.

Investigations aimed at producing 33% efficient perovskite-silicon tandem solar cells through device simulations.

The conversion efficiencies for silicon-based photovoltaic devices have become stagnant, with the record conversion efficiency of 26.7% achieved in 2017. This record efficiency is also close to the theoretical Auger limit of 29.

Correction: Synthesis and characterization of a new ZIF-67@MgAlO nanocomposite and its adsorption behaviour.

[This corrects the article DOI: 10.1039/D1RA01056E.].

The controlled synthesis and DFT investigation of novel (0D)-(3D) ZnS/SiO heterostructures for photocatalytic applications.

A ZnS/SiO photocatalyst was synthesized using a low-cost sol-gel wet chemical procedure. The as-synthesized ZnS/SiO nanocomposites with different molar ratios exhibited superior performance in the photodegradation of two organic dyes under UV irradiation, with complete degradation of both dyes after 2 hours of exposure to UV irradiation. The photocatalyst structure, microstructure, and surface area were studied using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM), and nitrogen adsorption ( ) studies.

Highly porous copper-supported magnetic nanocatalysts: made of volcanic pumice textured by cellulose and applied for the reduction of nitrobenzene derivatives.

Herein, a novel designed heterogeneous catalytic system constructed of volcanic pumice magnetic particles (VPMPs), cellulose (CLS) as a natural polymeric matrix, and copper nanoparticles (Cu NPs) is presented. Also, to enhance the inherent magnetic property of VPMP, iron oxide (FeO) nanoparticles have been prepared and incorporated in the structure an process. As its first and foremost excellent property, the designed composite is in great accordance with green chemistry principles because it contains natural ingredients.

Magnetic graphene oxide-lignin nanobiocomposite: a novel, eco-friendly and stable nanostructure suitable for hyperthermia in cancer therapy.

In this research, a novel magnetic nanobiocomposite was designed and synthesized in a mild condition, and its potential in an alternating magnetic field was evaluated for hyperthermia applications. For this purpose, in the first step, graphene oxide was functionalized with a natural lignin polymer using epichlorohydrin as the cross-linking agent. In the second step, the designed magnetic graphene oxide-lignin nanobiocomposite was fabricated by the preparation of magnetic FeO nanoparticles in the presence of graphene oxide functionalized with lignin.

One-pot green synthesis of antimicrobial chitosan derivative nanocomposites to control foodborne pathogens.

Food contamination by foodborne pathogens is considered a serious problem worldwide. This study aimed to show the efficacy of the one-pot green biosynthesis of nanocomposites as effective antimicrobial agents based on a water-soluble biodegradable polysaccharide and silver nitrate (AgNO). Silver (Ag) nanoparticles were synthesized using different concentrations of AgNO solution (1, 2, and 3 mM) in the presence of -quaternized chitosan and ,,-trimethyl chitosan chloride (TMC) as both a reducing and stabilizing agent.

Synthesis and characterization of a new ZIF-67@MgAlO nanocomposite and its adsorption behaviour.

Fabricating suitable adsorbents with low-cost and high efficiency extraction for measurement of very small amounts of agricultural pesticides in food and water is playing a vital key role in personal and environmental health. Here, a new composite of zeolitic imidazolate framework-67@magnesium aluminate spinel (ZIF-67@MgAlO) has been fabricated by a simple method at room temperature with different weight ratios. Several techniques such as FE-SEM, BET, XRD, and TGA have been used to confirm the structural characterization of the obtained materials.

Synthesis, characterization and antimicrobial activity applications of grafted copolymer alginate--poly(-vinyl imidazole).

-Vinyl imidazole was grafted onto sodium alginate (PVI--NaAlg) through a free radical polymerization technique in aqueous solution using potassium persulfate (KSO, KPS) initiator material. The conditions of the grafting process onto sodium alginate were adjusted to obtain a grafted copolymer with a high percentage of poly(-vinyl imidazole). The prepared grafted copolymer sodium alginate (NaAlg--PVI), with high percentage yield, was investigated and characterized under certain conditions in order to detect its antibacterial effect.

Recent Progress in Graphene- and Related Carbon-Nanomaterial-based Electrochemical Biosensors for Early Disease Detection.

Graphene- and carbon-based nanomaterials are key materials to develop advanced biosensors for the sensitive detection of many biomarkers owing to their unique properties. Biosensors have attracted increasing interest because they allow efficacious, sensitive, selective, rapid, and low-cost diagnosis. Biosensors are analytical devices based on receptors for the process of detection and transducers for response measuring.