Hojat Veisi

Payame Noor University | PNU · Department of Chemistry

In the scenario of global warming and pollution, the green synthesis and use of biodiesel has acquired utmost priority. Due to several limitations of homogeneous catalysis, organobase immobilized heterogeneous catalyzed production of biodiesel has come out as a favored route. The present report demonstrates the design and synthesis of Peganum harma...

A simple, affordable and green method for synthesis gold (Au) and sliver (Ag) nanoparticles (NPs) has been adopted using Thyme plant (Thymus kotschyanus) extract. The plant extract, being rich in polyphenolic compounds, act as natural green reducing agent to generate noble metal NPs in situ from their corresponding ions. The structural and physical...

A mild and efficient green protocol has been disclosed for tiny Pd NPs fabricated chitosan-pectin composite functionalized Kaolin ([email protected]/Pd). The post-synthetically modified biogenic material was characterized over a number of physicochemical methods like, FE-SEM, TEM, EDX, elemental mapping, XRD and ICP-OES. Catalytic efficiency of the...

The current investigation involves the novel biogenic synthesis of Au nanoparticles (Au NPs) templated over the Rosa canina fruit extract. Different phytochemicals like polyphenols, ascorbic acid, flavonoids, tannins etc contained in the plant extract facilitate the green reduction of Au ions and further stabilizations of Au NPs by encapsulation. T...

In this study, we utilized functionalized metal organic frameworks (MOFs) as a host matrix to embed gold (Au) nanoparticles. The three-dimensional Zr-based metal-organic framework UiO-66-NH2 was functionalized with the biguanidine moiety using a post-synthetic modification (PSM) strategy, and then gold salt was successfully immobilized onto the sur...

A mild, competent and eco-friendly protocol has been developed for oxidative esterification of various aldehydes over a post-synthetically modified and Pd fabricated chitosan-starch dual functionalized Fe3O4 microspheres as a magnetically isolable heterogeneous and biocompatible nanocatalyst. Molecular O2 was used as an oxidant in the reaction. A s...

In recent days, nanohybrid metal organic frameworks (MOF) have been considered as next generation catalysts due to their unique features like large surface to volume ratio, tailorable geometry, uniform pore sizes and homogeneous distribution of active sites. In this report, we address the biguanidine modified 3D Zr-centred MOF UiO-66-NH2 following...

In this study, a sensitive electrochemical sensor was designed based on Pd nanoparticles adorned poly-methyldopa (PMDA) modified TiO2 nanoparticles embedded over glassy carbon electrode (TiO2@PMDA/Pd/GCE) for the simultaneous quantitative estimation of acetaminophen (AC) and caffeine (CF) in biological and pharmaceutical samples. Several analytical...

A mild and efficient green protocol has been disclosed for selective oxidative esterification of various aldehydes over a novel Pd fabricated chitosan-starch polyplex encapsulated Kaolin ([email protected]) as a heterogeneous and reusable biocompatible nanocatalyst. Molecular oxygen was used as an oxidizing agent to generate water as the sole by-pr...

In the last few decades, production of alternative fuels has been a global concern among the environmental scientists in view of scarcity of fossil fuels andincreasing global warming. Biodiesels are being synthesized as green fuel by transesterification of different oils and fats over diverse synthetically developed novel heterogeneous catalysts. I...

In the present study, we demonstrate the synthesis of a novel biogenic nanocomposite by adorning in situ green synthesized Pd nanoparticles (Pd NPs) over the surface of magnetic nanoparticles by using Chamomileflower extract. It was physicochemically assigned by a number of analytical techniques. The as developed material was catalytically exploite...

We have designed a functionalized metal-organic framework (MOF) of UiO topology as a support, with an extremely high surface area, adjustable pore sizes and stable crystalline coordination polymeric structure and implanted copper (Cu) nanoparticles thereon. The core three dimensional Zr-derived MOF (UiO-66-NH2) was modified with a biguanidine moiet...

A new and efficient catalyst has been designed and prepared via in situ immobilization of Au NPs fabricated polydopamine (PDA)-shelled Fe 3 O 4 nanoparticle anchored over graphene oxide (GO) (GO/Fe 3 O 4 @PDA/Au). This novel, architecturally interesting magnetic nanocomposite was fully characterized using different analytical techniques such as Fie...

Herein, a simple and sensitive electrochemical aptasensor was fabricated on the electrodeposited nanoporous gold electrode. A layer of gold nanoparticle deposited on the surface of 3D mesoporous structures of SBA-15-Met provided a clean, stable, and biocompatible surface for self-assemble of chain BPA aptamers that bring about considerable advantag...

In recent days the nanomagnetic biocomposites have been evolved as sustainable green catalysts. In that context, we are prompted to design and synthesize a novel Pd NP adorned chitosan-starch dual biopolymer encapsulated core-shell type magnetic nanocomposite (Fe3O4@CS-Starch/Pd) in an eco-friendly pathway applying ultrasound irradiations. The morp...

One of the critical challenges in the simultaneous determination of As³⁺ and Cu²⁺ by stripping voltammetry is the overlapping of their oxidation peaks. Therefore, the engineering of nanostructured sensors in order to uplift their electrochemical performance is a significant issue for the codetection of As³⁺ and Cu²⁺. Herein, we modified a glassy ca...

This current research is based on a bio-inspired procedure for the synthesis of biomolecule functionalized hybrid magnetic nanocomposite with the Fe 3 O 4 NPs at core and Pd NPs at outer shell. The central idea was the initial modification of magnetic NP by the phytochemicals from Fritillaria imperialis flower extract, which was further exploited i...

This current study involves the novel synthesis of Au nanoparticles (Au NPs) decorated biguanidine modified mesoporous silica KIT-5 following post-functionalization approach. The tiny Au NPs were being stabilized over the in situ prepared biguanidine ligand. The high surface area material was characterized using analytical techniques like Fourier T...

Plant derived biogenic synthesis of nanoparticles (NP) has been the recent trend in material science as featured sustainable catalysts. A great deal of the current nanocatalytic research has been oriented on the bio-inspired green catalysts based on their wide applicability. In this context, CuO NPs are synthesized following a green approach using...

In this content, a green approach for the ultrasound promoted in situ immobilization of Pd NPs over biodegradable chitosan/agarose modified ferrite NP (Fe3O4@CS-Agarose/Pd) is developed. The structural and physicochemical features of the material were estimated using advanced analytical techniques like FT-IR, ICP-OES, FESEM, EDS, XRD, TEM and VSM....

A new, green, and recoverable catalyst is prepared for the synthesis of biodiesel.

This article displays synthesis of gold nanoparticles (Au NPs) decorated on sodium alginate (Alg) covered magnetite (Fe3O4@Alg-AuNPs) nanocomposite. Sodium alginate shell as a natural anionic polysaccharide on Fe3O4 microparticles core acted as a stabilizing agent for immobilization of Au NPs. Its catalytic performance was tested in the reduction o...

Pd(0) nanoparticles stabilized over polydopamine (PDA) capped magnetic GO/Fe3O4 nanocomposites (GO/Fe3O4@PDA/Pd) have been synthesized in variable Pd load following a post grafting approach. Pd has been reduced in situ by the functionalized PDA avoiding the use of external harsh reductant. The structural properties of the synthesized materials were...

A novel Pd (0) nanoparticles anchored over cyano modified SBA-15 was synthesized and characterized with different physicochemical techniques like Transmission Electron Microscopy (TEM), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray Spectroscopy (EDX), N2 adsorption-desorption isotherm, X-ray elemental mapping and X-ra...

A nanometric carbon CMK-3 modified with octylimidazolium ionic liquid and MoO42- as a new hybrid catalyst was synthesized. The study is the first to report a successful immobilization of MoO4= on the CMK-3/OctIm as a hybrid nanocatalyst. A variety of analytical methods were utilized to determine the properties of the structure and morphology of the...

The present report represents the synthesis of a novel Pd NPs immobilized over a natural polysaccharide (pectin) coated Fe3O4 magnetic nanocomposite material (Fe3O4@pectin/Pd) for investigating the cardiovascular protective effects. The biomolecular functionalization not only stabilizes the ferrite nanoparticles from agglomeration but also provides...

Due to the weak electrochemical behavior of 17α – ethinylestradiol, it is impossible to determine small amounts of 17α – ethinylestradiol (EE2) at the surface of conventional electrodes. Therefore, the designing and fabrication of electrochemical sensors with high performance are important. In this context, we developed a highly sensitive electroch...

A novel sulfonic-functionalized ionic liquid, C3N4 (C3N4-SO3H (IL)), was prepared and its structure was characterized using FTIR, TEM, XRD, CHNS elemental analysis and FESEM-EDX mapping. Catalytic activity of the liquid was studied for the syntheses of pyrazolo[3,4-b]pyridine and bis(indolyl)methane derivatives under moderate conditions. The cataly...

In this current study we report the implementation of Mn(IV) grafted multipyridine linked melanine functionalized SBA-15/CCPy/Mn(OAc)2 as a novel high surface area nanocatalyst. The melamine linked multipyridine ligand was introduced over mesoporous SBA-15 to ensure the strong chelation of Mn(OAc)2 in order to deploy as active site. The structural...

Chitosan is a linear polysaccharide and non-toxic bioactive polymer with a wide variety of applications due to its functional properties such as ease of modification, and biodegradability. In this study, a green protocol for in situ fabrication of ultrafine Pd nanoparticles on chitosan-encapsulated Fe3O4/SiO2-NH2 nanoparticles, without the use of a...

Recently, researchers have investigated the therapeutical properties of metal nanoparticles especially silver nanoparticles in vitro and in vivo conditions. The aim of the experiment was green synthesis and chemical characterization of silver nanoparticles from aqueous extract of Pistacia atlantica leaf (Ag NPs) and evaluation of their cytotoxicity...

Pollution of water by heavy metals such as cadmium is becoming a serious ecological and public health hazard due to their toxic effects even at very low concentrations. Thus, the removal of heavy metals from wastewater is very important for controlling environmental pollution. The purpose of this study was removal of cadmium from aqueous solution b...

In the current research work, a new KIT-5-biguanidine-Pd(0) catalyst was prepared and applied to ultrasound-assisted Suzuki–Miyaura cross-coupling reactions using ultrasound waves at ambient temperature. The ultrasound-assisted method is a green and efficient method for C–C coupling. Many parameters of the Suzuki coupling reaction were examined, su...

A novel green tea extract–encapsulated silica gel decorated with in situ–generated Pd nanoparticles is reported as an efficient, green heterogeneous catalyst in the Buchwald-Hartwig C–N cross-coupling reaction. It was characterized by several analytical techniques. Thereafter, a wide range of aryl amines were synthesized in good to excellent yields...

1,4-bis(3-methylimidazolium-1-yl)butane ditribromide [bMImB].(Br3)2 has been synthesized and explored as a new efficient brominating agent. The crystalline ditribromide reagent is stable for months and acts as a safe source of bromine requiring just 0.5 equiv for complete bromination. It has high active bromine content per molecule and shows a rema...

Heterogeneous catalysts are more prominent rather than homogenous catalysts since they are simply separated from products. To improve and develop heterogeneous catalysts, two core–shell magnetic nanocatalysts are prepared by anchoring of Cu and Ce complexes on the surface of Fe3O4, then the efficiency of the obtained catalysts are tested toward bot...

This research suggests a green method for synthesizing hybrid magnetic nanocomposites that can be used as a reductant and a stabilizing agent for immobilizing metal nanoparticles (NPs). The central idea is the modification of magnetic NPs using Rubia tinctorum extract, which consists of numerous carbonyl and phenolic hydroxyl functional groups to i...

In this study, a new nanocomposite consists of magnetic graphene oxide (GO/Fe3O4), poly-methyldopa (PMDA) and Pd nanoparticle was prepared and utilized for constructing an electrochemical sensor to determine acetaminophen (AC) and phenylephrine (PHE). The structure of nanocomposite has been characterized by Fourier transform infrared spectroscopy (...

Background: Interest in functionalized carbon nanotubes for many applications arises from a variety on the kind of modification atoms or molecules that are attached to it. Dopamine, the feel-good hormone, release by neurons and playing an important role in body systems. Abnormal dopamine levels cause nerve disorders such as Parkinson's disease and...

Silver (Ag) nanoparticles (NPs) were prepared through a biological procedure where the essential oils of orange peel were used as a capper and reductant agent. Characterization of these Ag/EOs orange NPs was carried out using X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-...

In this work, an easily obtained procedure was successfully implemented to prepare novel palladium nanoparticles decorated on triethanolammonium chloride ionic liquid‐functionalized TiO2 nanoparticles [TiO2/IL‐Pd]. Different methods were carried out for characterizations of the synthesized nanocatalyst (HR‐TEM, XPS, XRD, FE‐SEM, EDX, FT‐IR and ICP)...

A novel Ce(IV) anchored L-Leucine covalently bonded over mesoporous MCM-41 has been synthesized by non-hydrothermal templated and post-functionalization approach. It has been characterized thoroughly by sophisticated physicochemical techniques. The material was applied in the efficient green synthesis of aromatic sulfides by C-S coupling using mole...

This work describes (i) an eco-friendly approach for in situ immobilization of Pd nanoparticles on the surface of Fe3O4 nanoparticles, with help of green tea extract and ultrasound irradiations, without using any toxic reducing agents and (ii) development of ultrasound assisted simple protocol for synthesis of biphenyl compounds. The structural, mo...

Herein, fabrication and electrochemical evaluation of a new sensing platform, which is sensitive to clonazepam (CLZP) drug, has been illustrated. By using Fourier transform infrared spectrometry (FT-IR), electron microscopy (EM) techniques and vibrating sample magnetometer (VSM), synthesized nanocomposite, consisting of Fe3O4, 3-aminopropyltriethox...

A mixed nano-metal oxides of Cu-Ni-Co has been synthesized. Several characterization techniques (EDS, XRD, TEM, and SEM) have been used to provide insight into the nature and structure of the catalyst. The size of this mixed metal oxide is 22 nm. The SEM images indicate that the sample with spherical particles, of which spherical assembly is compri...

A dual-metal catalysis system including a newly prepared nanoparticle [SiO2@organic-linker(OL)@Pd(II)] and CuI was introduced with ultra-high catalytic activity (high turnover number (TON), up to 19000) to a one-pot and odorless synthesis of unymmetrical aryl sulfides by crossover C−S bond formation. The reaction proceeds via C-O bond activation of...

Merrifield Resin was functionalized with metformine and applied as a solid support to immobilize the CuCl2. The Ps‐Met/CuCl2 was characterized by several techniques including Fourier transform infrared (FTIR), field emission scanning electron microscopy (FESEM), energy‐dispersive X‐ray spectroscopy (EDX), wavelength‐dispersive X‐ray spectroscopy (W...

Targeted drug delivery is a promising approach to overcome the limitations of classical chemotherapy. In this respect, Imatinib‐loaded chitosan‐modified magnetic nanoparticles were prepared as a pH sensitive system for targeted delivery of drug to tumor sites by applying a magnetic field. The proposed magnetic nanoparticles were prepared through mo...

In the present work, a novel catalysts prepared by the anchoring of Gd(III) complex with OH groups on the surface of Fe 3 O 4 in which characterized by FT-IR, TGA, XRD, EDX, VSM, and ICP-OES techniques and tested in the synthesis of tetrazoles and S–S coupling. This designed methods indicated several advantages including easily recovered from the r...

In this study, a complete green synthesis method to reduced graphene oxide-Ag nanoparticles hybrid by applying extract of Pistacia atlantica leaves as both stabilizing and reducing agent was reported. P. atlantica leaves extract reduce graphene oxide and adsorbing on the graphene surface. Moreover, the surface adsorbed P. atlantica leaves extract c...

Tannic acid, as a humic-like substance with phenolic hydroxyl and carbonyl functional groups, can modify the surface of Fe 3 O 4 nanoparticles (NPs). Moreover, it can improve surface properties and capacity of Fe 3 O 4 for adsorption and reduction of silver ions through complexing with them, in aqueous solutions. Therefore, Fe 3 O 4 @TA NPs have po...

In this article the new heterogeneous photocatalyst based on palladium supported on thiol-functionalized multi-walled carbon nanotubes (MWCNTs) has been introduced. The synthetic process of preparation of mentioned nanocatalyst (MWCNTs/Si-SH/Pd) has been described. The formation of nanocatalyst was analyzed by FTIR, Raman spectroscopy, EDS, TEM, SE...

The development of highly efficient and green catalyst for the one-pot synthesis of 5-substituted tetrazole and polyhydroquinoline derivatives is an extremely important and ground challenging area in organic chemistry. In this study, two catalysts were prepared by the immobilization of Ni and Cu on ordered mesoporous silica (SBA-15) coated with gly...

Ultrasound irradiation was used to prepare one-pot Fe3O4@PEG core/shell nanostructure for the first time. The morphology, structure, and physicochemical properties were specified by different analytical techniques including field emission scanning electron microscopy, Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, tr...

The palladium (Pd) supported on thio-modified multi walled carbon nanotubes (MWCNTs/CC-SH/Pd) was utilized as a useful and reusable nanocatalyst in Suzuki–Miyaura coupling reactions. The catalyst was really efficient for the Suzuki–Miyaura reaction of aryl halides (Ar–I, Ar–Br, Ar–Cl) with phenylboronic acid and conversion was good in most cases. T...

Palladium nanoparticles encapsulated in biguanidine–functionalized chitosan matrix ([email protected]–biguanidine) was applied as a reusable and core–shell nanocatalyst for cyanation of aryl iodides and bromides with K4[Fe(CN)6] as the cyanating agent. The nitriles were generated in good to excellent yield and the catalyst can be recycled and reapp...

Infections, especially those caused by multi-drug resistant pathogens, result in serious problems in wound healing process. In this study, Zataria multiflora (ZM) essential oil, as a strong natural antimicrobial agent, is incorporated into poly (vinyl alcohol)-based nanofiber mats to fabricate a novel wound dressing. Different amounts of ZM essenti...

Surface modification of Fe3O4 nanoparticle with thiol groups was used for the immobilization of silver nano-particles to produce Fe3O4/SiO2-Pr-S-Ag NPs. The prepared catalyst was characterized by Inductively coupled plasma (ICP), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), ener...

A new nanocomposite based on gold nanoparticles supported on mercaptoethanol bonded to melamine modified multi-walled carbon nanotubes (MWCNTs/CC-SH/AuNPs) was synthesized, characterized and used as sensitive sensor for the determination of levothyroxine (T4) using glassy carbon electrode. In order to characterize the nanocomposite, different metho...

High reaction rate and easy availability make green synthesis of metal nanoparticles noticeable. In the present study, gold nanoparticles with wide applications in different fields were synthesized by an ecofriendly method at room temperature using Stachys lavandulifolia extract as the reducing agent. Properties of the synthesized gold nanoparticle...

In current research, the multi walled carbon nanotubes was functionalized with mercapto-melamine groups by covalent grafting of f-CNT with ethylenediamine, cyanuric chloride and 2-mercaptoethanol for introducing mercapto functional groups on the surface of nanotube. Consequently, the thiolated MWCNTs were applied to deposing Pd nanoparticles. The r...

In this study, Pd nanoparticles supported on Metformin modified graphene oxide (GO-Met-Pd) is proposed as a green heterogeneous catalyst. The structural properties of the as-synthesized nanocatalyst were determined by X-ray diffraction (XRD), Fourier transformed infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), field emission s...

In current research, a new green process for modifying multi walled carbon nanotubes (MWCNTs) using extract of Stachys lavandulifolia as both stabilizer/capper and reductant agent was reported. The adsorbed biopolymers of S. lavandulifolia extract on the surface of CNTs can cause more in situ reduction of silver ions to silver nanoparticles and sta...

In this article, a highly sensitive electrochemical sensor is introduced for direct electro-oxidation of bisphenol A (BPA). The novel nanocomposite was prepared based on multi-walled carbon nanotube/thiol functionalised magnetic nanoparticles (Fe3O4-SH) as an immobilisation platform and gold nanoparticles (AuNPs) as an amplifying electrochemical si...

A green method is proposed for synthesizing silver nanoparticles using oak leaf extract as a reductant, capper and stabilizing agent. The characterization of biosynthesized Ag@oak leaf extract (Ag@OLE) was performed using scanning electron microscopy–energy‐dispersive X‐ray analysis, X‐ray diffraction, transmission electron microscopy and UV–visibl...

To fabricate SiO2/PDA–SO3H nanocatalyst, a suitable method is designed for the loading of sulfonic acid groups on the surface of polydopamine (PDA)-encapsulated SiO2 nanoparticles. To bridge the gap between heterogeneous and homogeneous catalysis, surface functionalization of silica gel is an elegant procedure. The morphology, structure, and physic...

Poly-methyldopa (PMDP)-coated Fe3O4 nanoparticles (Fe3O4@PMDP) have been synthesized through a simple and green procedure. In the present study, for the first time, Pd nanoparticles were successfully deposited using Fe3O4@PMDP as a core-shell magnetic coordinator and stabilizer agent. In this protocol, Pd ions were adsorbed on surfaces of Fe3O4@PMD...

An efficient method was proposed to synthesize polydopamine (PDA)-coated Fe3O4 nanoparticles (Fe3O4@PDA). For the first time, effective deposition of Pd complex is explained by using Fe3O4@PDA as a core–shell magnetic coordinator and stabilizer agent. In this method, palladium ions were adsorbed on Fe3O4@PDA surfaces through immersion of the Fe3O4@...

In this study, a schiff-base oxo-vanadium complex supported on magnetic Fe3O4 nanoparticles [VO(BINE)@Fe3O4] is prepared as a novel magnetically interphase nanocatalyst and its structural features are evaluated using different methods of TEM, SEM, EDX, ICP, VSM, TGA and FT-IR. Catalytic investigations demonstrate that this catalyst can catalyze che...