Publications

Synthesis, characterization, and application of nano-molecularly imprinted polymer for fast solid-phase extraction of tartrazine from water environment

In this paper, a new water-compatible nano-molecularly imprinted polymer (MIP) of tartrazine with high-efficiency and a non-imprinted polymer (NIP) were synthesized by precipitation polymerization in aqueous medium as a green method and were characterized. Acryl amide and N,N′-methylene-bis-acrylamide were used as functional monomer and cross-linking agent, respectively. The synthesized MIP and NIP were characterized using thermal gravimetric analysis, differential scanning calorimetry, scanning electron microscopy, and fourier transform infrared spectroscopy. The MIP as a selective sorbent and the NIP as a blank were used to remove tartrazine, using solid-phase extraction from water environment. The effects of pH, time, MIP dosage, and tartrazine concentration on removing tartrazine were studied. The results show that the obtained MIP exhibits higher affinity for tartrazine. The imprinting-induced extraction was confirmed by determination of recovery values for NIP (8%) and MIP (91%). The binding capacity of MIP for this template was 147.6 mg g−1.

Soy meal hull activated carbon: preparation, characterization and dye adsorption properties

In this paper, the preparation, characterization and dye adsorption properties of soy meal hull activated carbon (SMH-AC) were investigated. Physical characteristics of SMH-AC were studied using Fourier transform infrared (FTIR) and scanning electron microscopy (SEM). Two textile dyes, Acid Red 14 (AR14) and Acid Red 18 (AR18), were used as model compounds. The effects of operational parameter such as SMH-AC dosage, initial dye concentration, pH and salt on dye removal were evaluated. The isotherm of dye adsorption was studied. The data were evaluated for compliance with the Langmuir and Freundlich isotherm models. It was found that AR14 and AR18 followed with Langmuir isotherm. Based on the data of present investigation, one could conclude that the SMH-AC being an eco-friendly and low-cost adsorbent might be a suitable alternative to remove dyes from colored aqueous solutions.

Synthesis of novel Starch/zeolitic imidazolate framework (ZIF-67)/Graphene oxide biocomposite and photocatalytic dye degradation ability

Water pollution is one of the problems that must be solved quickly. Synthetic dyes are known as one of the main organic contaminant groups in water that have a bad effect on human and aquatic life. Herein, Starch/Zeolitic imidazolate framework (ZIF-67)/Graphene oxide biocomposites (SZ67GO) were synthesized with various starch values (0.5, 1 and 1.5 g denoted as SZ67GO-0.5, SZ67GO-1 and SZ67GO-1.5, respectively). The synthesized materials were characterized and used for the degradation of Acid Blue 92 (AB92) in the presence of LED visible light. The effect of catalyst dosage, contaminant concentration, and pH on AB92 degradation was studied. The AB92 removal using visible light was 4% for Starch, 24% for GO, 40% for ZIF-67, and 75–86.4 % for Starch/ZIF-67/GO composites. SZ67GO-1 biocomposite showed the highest degradation ability. The AB92 degradation efficiency using 0, 2, 4, 6, and 8 mg of SZ67GO-1 biocomposite are 1, 20, 52, 67.3, and 86.4%, respectively. The kinetics of decolorization by SZ67GO-1 biocomposite followed the zero-order. The reusability of SZ67GO-1 biocomposite for 3 cycles of AB92 degradation was above 82% (cycle 1: 86.4%, cycle 2: 84%, and cycle 3: 82%)

PROPERTIES OF BULK <font>Fe</font>–<font>Ni</font>/CNT NANOCOMPOSITES PREPARED BY MECHANICAL MILLING AND SINTERING

The effects of carbon nanotubes (CNTs) on mechanical and tribiological properties of the NiFe /CNT composites prepared by high energy mechanical alloying and hot pressing, were investigated. Bulk samples were prepared by sintering of cold pressed (300 MPa) samples at 1040° C for 1 h. X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and optical microscopy were employed for evaluation of the phase composition, surface morphology and porosities of the samples. The microhardness of as-milled Ni 3 Fe and NiFe powders reached to 720 and 650 VHN, respectively. The hardness of NiFe and Ni 3 Fe bulk samples reduced to 190 and 270 Vickers because of the grain growth during sintering and remaining porosity. The hardness of NiFe -CNT and Ni 3 Fe -CNT bulk samples reached to 360 and 400 Vickers, respectively. The friction and wear properties of the bulk samples were investigated under dry conditions using a pin-on-disk test rig under an applied load of 8 N. The wear rate, mass loss and friction coefficient of the composite samples remarkably reduced in comparison with NiFe and Ni 3 Fe matrix alloys which demonstrate effects of the CNTs on mechanical and tribiological behavior of the composites resulting from the excellent mechanical properties and unique topological structure of the CNTs.

Adsorption of textile dyes on Pine Cone from colored wastewater: Kinetic, equilibrium and thermodynamic studies

In this paper, the adsorption of Acid Black 26 (AB26), Acid Green 25 (AG25) and Acid Blue 7 (AB7) onto Pine Cone (PC) was investigated in aqueous solution. Surface study of PC was investigated using Fourier transform infrared (FTIR) and scanning electron microscopy (SEM). The effect of operational parameters such as adsorbent dosage, dye concentration, inorganic anion (salt), pH and temperature onto dye removal was studied. The intraparticle diffusion model, the pseudo-first order and the pseudo-second order were used to describe the kinetics data. Equilibrium isotherms were analyzed using Langmuir, Freundlich and Tempkin adsorption models. Thermodynamic parameters of dye adsorption were obtained. The experimental data fitted well to the pseudo-second order kinetics model for dyes. The results indicated that isotherm data of AB26 and AG25 followed Langmuir isotherm and isotherm data of AB7 followed Freundlich isotherm models. The thermodynamic data indicated that the adsorption was endothermic process. Dye desorption studies in aqueous solution at pH 12 showed that maximum desorption of 93%, 97% and 94.5% were achieved for AB26, AG25 and AB7, respectively. It can be concluded that PC could be effectively employed as an effective biosorbent for the removal of dyes.

Poly (amidoamine-co-acrylic acid) copolymer: Synthesis, characterization and dye removal ability

In this paper, poly (amidoamine-co-acrylic acid) copolymer (PAC) was synthesized and its dye removal ability was investigated. The functional groups of PAC were studied using Fourier transform infrared (FTIR). Direct Red 31 (DR31), Direct Red 80 (DR80) and Acid Blue 25 (AB25) were used as model compounds. The effects of operational parameters such as adsorbent dosage, pH and salt on dye removal were evaluated. The isotherm and kinetics of dye adsorption were studied. The maximum dye adsorption capacity (Q 0) of PAC was 3400mg/g, 3448mg/g and 3500mg/g for DR31, DR80 and AB25, respectively. It was found that adsorption of DR31, DR80 and AB25 onto PAC followed with Langmuir isotherm. Adsorption kinetics of dyes followed pseudo-second order kinetics. Dye desorption tests (adsorbent regeneration) showed that the maximum dye release of 88% for DR31, 90% for DR80 and 86% for AB25 were achieved in aqueous solution at pH 12. The results showed that the PAC as a polymeric adsorbent with high dye adsorption capacity might be a suitable alternative to remove dyes from colored wastewater.

Evaluation of the adsorption kinetics and equilibrium for the potential removal of acid dyes using a biosorbent

The adsorption of Acid Red 14 (AR14) and Acid Blue 92 (AB92) onto the microporous and mesoporous egg shell membrane (ESM) was investigated in aqueous solution in a batch system with respect to initial dye concentration, pH, contact time, particle size and biosorbent doses at 20±1°C. The surface area, Fourier transform infrared (FTIR) and scanning electron microscopy (SEM) of ESM were obtained. The surface area of ESM was found to be 2.2098m2/g. The pseudo-first-order, pseudo-second-order kinetics and the intraparticle diffusion models were used to describe the kinetics data. The rate constants at different pH values (2–12) were evaluated. The experimental data fitted well to the pseudo-second-order kinetics model at pH values of 2–8 and pseudo-first-order kinetics model at pH values of 10 and 12 for both dyes. Equilibrium isotherms were analyzed by Langmuir, Freundlich and Redlich–Peterson adsorption models. Maximum desorption of ≥89.6% was achieved for AR14 and 82.8% for AB92 in aqueous solution at pH 12. The results indicate that ESM could be fruitfully employed as effective biomaterial for the removal of residual color from effluents.

Green halogenation of aromatic compounds using environmentally friendly synthesized rod-like metal-organic framework (MIL-88A) catalyst

Metal-organic frameworks (MOFs) have been extensively investigated as catalysts to synthesis of various chemical and eliminate toxic pollutants in water. Herein, MOF was used as an efficient catalyst for the halogenation of aromatic materials (aniline, b-naphthol, and naphthalene). The rod-like MIL-88A as an iron-based MOF was synthesized using Fe3+ with fumaric acid in water as a green solvent. The synthesized catalyst was characterized by FT-IR, XRD, SEM, and Raman. The rod-like MIL-88A is evaluated as the heterogeneous catalyst to activate KBr/I for the halogenation of aromatic compounds. 1HNMR and 13CNMR were used to characterize the halogenated aromatic materials. Halogenation of aromatic rings has been studied using potassium bromide (KBr) and potassium iodide (KI) as brominating and iodinating agents in the presence of rod-like MIL-88A as oxidant under solvent-free reaction (grinding) conditions. The halogenation yield of aromatics materials was 80–99%. The conversion yield of aniline to 4‑bromo aniline using 0, 10, 20, 30, 40, and 50 mg of rod-like MIL-88A at 25 min and room temperature (25 ºC) were 0%, 76%, 85%, 90%, 95%, and 88%, respectively. In addition, the conversion yield of B-naphthol to 1-Bromo-2-naphthol using a green catalyst was 97%. Also, the conversion yield of Naphthalene to 1-Bromonaphthalene using a rod-like catalyst. In most cases, mono-halogen derivatives were obtained in good yield without the aid of strong acids. In addition, the rod-like MIL-88A catalyst shows excellent stability and can be reused after proper washing treatments. It could be concluded that green synthesized rod-like MIL-88A could be used as an environmentally friendly catalyst for the halogenation of aromatics via grinding as a solvent-free reaction at room temperature.

Organic Materials as Corrosion Inhibitors for Aqueous Medium: A Review

not Available.

ERRATUM: PROPERTIES OF BULK Fe-Ni/CNT NANOCOMPOSITES PREPARED BY MECHANICAL MILLING AND SINTERING

Dye removal from colored textile wastewater using chitosan in binary systems

In this paper, the removal of two anionic dyes from textile effluent in single and binary systems was investigated. Direct Red 23 and Acid Green 25 were used as anionic dyes. The surface characteristics of chitosan were investigated using Fourier transform infrared. The effects of operational parameters such as chitosan dosage, initial dye concentration, salt and pH on dye removal were studied. The isotherms of dye adsorption were investigated. It was found that the isotherm data of Direct Red 23 and Acid Green 25 in single and binary systems followed Tempkin isotherm. In addition adsorption kinetics of dyes was studied in single and binary systems and rate sorption was found to conform to pseudo-second order kinetics with a good correlation. Results indicated that chitosan could be used as a biosorbent to remove the anionic dyes from contaminated watercourses in both single and binary systems of pollutants.

Dye removal from colored textile wastewater using acrylic grafted nanomembrane

In this paper, the dye removal ability of the acrylic grafted polysulfone nanomembrane using ultraviolet radiation was studied to remove dyes from colored textile wastewater. Acrylic acid was used to modify polysulfone ultrafiltration membrane. The effect of different operating parameters such as pressure, salt concentration and chemical structure of dyes was evaluated. Data indicated that the photografted membrane has acceptable performance both in terms of flux and rejection. The dye rejection and hydraulic permeability were 86–99.9% and 7.6Lm−2 h−1 bar−1, respectively. It was found that the rejection of dyes decreased with salt concentration due to a decrease of the Donnan effect. Also, the low molecular weight dyes and highly charged dyes were more sensitive in the presence of salts. Addition of 80mM Na2SO4 in dye solution decreased the dye rejection more than 15%. The rejection enhancement for all cases was negligible by increasing driving pressure from 1 to 4bar. Dyes with low charger were more sensitive to operating pressure than that of dyes with higher charges. All findings supported that acrylic grafted nanomembrane is potentially capable to separate dyes from colored textile effluent.

Synthesis of functionalized metal-organic framework metal-organic framework (MIL-53)/Chitosan for removing dye and pharmaceuticals

Herein, an eco-friendly biocomposite (metal-organic framework (MIL-53)/Chitosan (biological macromolecule)) was synthesized. MIL-(Fe) (Material Institute of Lavoisier: metal-organic framework) was synthesized and denoted as MIL-53A. The material was modified with different amounts of 3-amino propyl trimethoxy silane for preparing different MILs-53A/NH2. Finally, the surface functionalized metal-organic framework and biological macromolecule (SFMOF/BM) biocomposite was synthesized and characterized using XRD, FESEM, TEM, EDS, BET, TGA, FTIR, and Raman and used to remove emerging pollutants (Direct Red 23 and pharmaceuticals (tetracycline and doxycycline)). Adsorption obeyed a pseudo-second-order kinetic model. The adsorption capacity of the MIL-53A and MIL-53A/NH2 was 3,333 and 10,000 mg/g, respectively. SFMOF/BM had the highest adsorption capacity (12,500 mg/g). Adsorption performance remained high even after five regeneration cycles. The results indicated that SFMOF/BM biocomposite could be used as an environmentally friendly adsorbent of dye and pharmaceuticals. The SFMOF/BM could provide multiple non-covalent interactions to remove different organic pollutants, in which both π-π interactions/stacking and H-bonding are suggested to be responsible for the adsorption of dye, tetracycline, and doxycycline.

SYNTHESIS OF ALGINATE AMIDE COMPOSITE USING MICROWAVE AND ITS DYE REMOVAL ABILITY

In this work, magnetic alginate was synthesized by encapsulating of Nickel Zinc Ferrite nanoparticle within Ca-alginate.The synthesized magnetic alginate was modified by ethylenediamine using microwave radiation to remove anionic dye from wastewater.The characteristics of magnetic nanoparticle, magnetic alginate and magnetic alginate amide (MAA) were studied using Fourier transform infrared (FTIR) and Scanning electron microscope (SEM).FTIR analysis confirmed the amidation of alginate.Direct Red 31 (DR31) was used as model compound.The effect of operational parameters such as adsorbent dosage, pH and dye concentration on dye removal was evaluated.The kinetic, isotherm, and thermodynamic of dye adsorption was studied.Adsorption kinetic of DR31 was found to conform to pseudo-second order kinetics.It was found that adsorption of DR31 on MAA followed Langmuir isotherm.The thermodynamic study showed that dye removal using MAA was spontaneous, endothermic, and a physisorption reaction.The results indicate that MAA could be employed as a suitable alternative to remove dyes from wastewater.

Gemini polymeric nanoarchitecture as a novel adsorbent: Synthesis and dye removal from multicomponent system

In this paper, gemini polymeric nanoarchitecture (GPN) as a novel adsorbent was synthesized, and its dye removal ability from single and multicomponent (ternary) systems was investigated. The physical characteristics of GPN were studied using Fourier transform infrared (FTIR). Acid Blue 92 (AB92), Direct Green 6 (DG6), and Direct Red 31 (DR31) were used as model compounds. The isotherm and kinetic of dye adsorption from single and multicomponent (ternary) systems were studied. The effect of operational parameter such as adsorbent dosage, dye concentration, and salt on dye removal was evaluated. The maximum dye adsorption capacity (Q 0) of GPN was 1000mg/g, 1428mg/g, and 1250mg/g for AB92, DG6, and DR31, respectively. It was found that adsorption of AB92, DG6, and DR31 onto GPN followed with Langmuir, Freundlich, and Langmuir isotherms, respectively. Adsorption kinetic of dyes followed pseudo-second order kinetics. The results showed that the GPN as an insoluble polymeric adsorbent with high dye adsorption capacity might be a suitable alternative to remove dyes from colored wastewater.

Primary–secondary amino silica nanoparticle: synthesis and dye removal from binary system

In this paper, primary–secondary amino silica nanoparticle (PSASN) was synthesized, and its dye removal ability from single and binary systems containing printing dyes was investigated. The synthesized PSASN was characterized by means of Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and BET analyses. Acid blue 92 (AB92), Direct Black 22 (DB22), Direct Red 31 (DR31), and Direct Red 80 (DR80) were used. The kinetics and isotherm of dye adsorption were studied. The effects of PSASN dosage, pH, salt, and initial dye concentration on dye removal were evaluated. Adsorption kinetic was found to conform to pseudo-second-order kinetics. The maximum dye adsorption capacity (Q0) of PSASN for AB92, DB22, DR31, and DR80 were 113.636, 37.453, 114.943, and 41.152 mg/g, respectively. It was found that dye adsorption on PSASN followed Langmuir isotherm. The results showed that the PSASN as an adsorbent with dye adsorption capacity might be a suitable alternative to remove dyes from colored printing wastewater.Keywords: Primary–secondary amino silica nanoparticleSynthesisDye removalBinary systemPrinting wastewater

Novel electrospun metal-organic framework nanofibers (Nickel-coated ZIF-67/Chitosan/Polyvinyl Alcohol) as efficient adsorbents: Isotherm, kinetic and thermodynamic

Binary system dye removal from colored textile wastewater using activated carbon: Kinetic and isotherm studies

This paper investigates the ability of activated carbon (AC) to adsorb two anionic dyes from colored wastewater in single and binary systems. Direct Blue 78 (DB78) and Direct Red 31 (DR31) were used as anionic dye models. The surface characteristics of AC were investigated using fourier transform infrared (FTIR) and scanning electron microscopy (SEM). The effects of AC dosage, initial dye concentration and salt on dye removal were investigated at 25°C. The kinetic and isotherm of dye adsorption were studied. Adsorption kinetic of dyes was studied in single and binary systems and rate sorption was found to conform to pseudo — second order kinetic model. The isotherm data of dyes in single and binary systems followed Langmuir isotherm. The maximum adsorption capacity (Q0) of DB78 and DR31 was 76.92mg/g and 111mg/g for single system and 76.92mg/g and 125mg/g for binary system, respectively. Results indicated that AC could be used as an adsorbent to remove the anionic dyes from single and binary pollutants systems.

Copper oxide-carbon nanotube (CuO/CNT) nanocomposite: Synthesis and photocatalytic dye degradation from colored textile wastewater

No abstract is provided for this article.