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article

Chromium VI adsorption from sodium chromate and potassium dichromate aqueous systems by hexadecyltrimethylammonium-modified zeolite-rich tuff

N. Salgado-Gómez, M.G. Macedo-Miranda, M.T. Olguín, N. Salgado-Gomez, more

Applied Clay Science > 2014 > 95 > Complete > 197-204

In the present investigation, zeolite-rich tuff from the state of Chihuahua, which was conditioned with a sodium chloride solution and subsequently modified with a hexadecyltrimethylammonium bromide solution, was used to evaluate the removal of Cr(VI) from aqueous systems prepared with Na ₂ CrO ₄ , K ₂ Cr ₂ O ₇ or a mixture of both Na ₂ CrO ₄ ...

article

The Coupling of Local Strain and K⁺‐Ion Release Induced Phase Transition Heterogeneity in Tunnel MnO₂

Haoyang Peng, Fanjie Xia, Chenyu Zhang, Haoxiang Zhuo, more

Advanced Functional Materials > 32 > 26 > n/a - n/a

The structure and valence transitions in multi‐valent transition metal oxides are closely associated with the intrinsic functionalities that exhibit wide applications in various fields, such as rechargeable batteries, supercapacitors, and catalysis. The internal strain due to intercalated and then released alkali‐ions and defects plays a critical role in tuning the energetically close correlated structures...

article

Single‐walled carbon nanotubes (SWCNTs) as an efficient adsorbent for removal of reactive dyes from water solution: Equilibrium, kinetic, and thermodynamic

Ali Naghizadeh, Azam Karimi, Elham Derakhshani, Adeleh Esform

Environmental Quality Management > 31 > 4 > 133 - 140

Dyes are water‐soluble aromatic compounds that are widely used in the industry today. Among the industries, the textile and leather industries rank first in the use of dyes. Common methods for removing of dyes often lead to the production of large volumes of sludge, which finally leads to problems with the treatment and disposal of sludge. This study aimed to investigate the efficiency of single‐walled...

article

The kinetic and experimental study for the syngas production from ethanol dry reforming over a Ni‐Cu/La₂O₃ catalyst

Amir Mosayebi

International Journal of Energy Research > 46 > 9 > 12207 - 12228

The mechanistic kinetic model through Langmuir‐Hinshelwood (LH) isotherm was derived for ethanol dry reforming (EDR) processaccompanied by the ethanol decomposition (ED) and methane dry reforming (MDR). For justifying mechanistic relation, EDR tests wereaccomplished under a vast range of operating variables (including temperature varied from 500°C to 900°C and ratio of CO₂ to C₂H₅OH in the inlet feed...

article

Kinetics, mechanism, and simulation of hydrogen transfer reaction of α, β‐unsaturated aldehydes to allylic alcohols

Hui Guo, Yuchao Li, Cuncun Zuo, Yanxia Zheng, more

AIChE Journal > 68 > 7 > n/a - n/a

Homogeneous hydrogen transfer reactions of methacrolein (MAL) and isopropanol to methallyl alcohol (MAA) were investigated in batch reactor (Conv. 89%, Select 93.1%) and tubular reactor (Conv. 88.1%, Select 95%) using aluminum isopropoxide (Al(OPrⁱ)₃) as catalyst. Kinetic experiments on hydrogen transfer reactions and reaction order were investigated in batch reactor and tubular reactor. Response...

article

Effect of molecular weight on crystallization behavior of poly (lactic acid) under isotherm and non‐isotherm conditions

Nader Zirak, Mohammadali Shirinbayan, Sedigheh Farzaneh, Abbas Tcharkhtchi

Polymers for Advanced Technologies > 33 > 4 > 1307 - 1316

The effect of molecular weight on the crystallization behavior of poly(lactic acid) (PLA) both isothermally and non‐isothermally was studied using differential scanning calorimetry and polarized optical microscopy. Two distinct crystal forms (α and α′) were investigated under normal conditions of crystallization for different molecular weights. Using microscopy, the growth rate of spherulites was...

article

CeO₂/TiO₂/SiO₂ nanocatalyst for the photocatalytic and sonophotocatalytic degradation of chlorpyrifos

Reza Mansourian, Seyedeh Maryam Mousavi, Shahin Alizadeh, Samad Sabbaghi

The Canadian Journal of Chemical Engineering > 100 > 3 > 451 - 464

A new nanohybrid photocatalyst named cerium (IV) oxide (CeO₂)/TiO₂ (titania)/silicon dioxide (SiO₂) was firstly synthesized employing the co‐precipitation technique to elaborate the degradation efficiency of chlorpyrifos (CPS) as a relatively indelible organophosphorus pesticide in deionized water in photocatalytic and sonophotocatalytic processes. The influence of various parameters, including photocatalyst...

article

Kinetic and thermodynamic characterization of lipase from Aspergillus melleus and its biocatalytic performance for degradation of poly(ɛ‐caprolactone)

Misbah Amin, Haq N Bhatti, Muhammad Bilal

Journal of Chemical Technology & Biotechnology > 97 > 2 > 446 - 454

BACKGROUND Lipases are an interesting class of enzymes that can be used as biocatalysts for poly(ɛ‐caprolactone) degradation. This work reports on the biochemical characterization of a lipase produced through solid‐state fermentation by Aspergillus melleus and its application to degrade poly(ɛ‐caprolactone). RESULTS Lipase demonstrated the best activity and remained stable even after 24 h at an...

article

The behaviour of tannic acid adsorption on fluorite surface: isotherm, kinetic and thermodynamic studies

Mariam Tangarfa, Naoul Semlali Aouragh Hassan

Physicochemical Problems of Mineral Processing > 2022 > Vol. 58, iss. 1 > 77--87

Fluorite is an important mineral to produce hydrofluoric acid. As fluorite resources contain calcite as a gangue mineral, the separation between these two calcium containing minerals is difficult. Tannic acid is the most commonly used reagent as a depressant to separate fluorite from calcite by flotation. To enhance this separation, it is so primordial to understand tannic acid physicochemical reactivity...

article

Classical‐Fenton and Photo‐Fenton oxidation of wastewater arising from cosmetic automobile care products

Hüseyin Cüce, Fulya Aydın Temel

Environmental Progress & Sustainable Energy > 40 > 6 > n/a - n/a

The goal of the study is to investigate Classical‐Fenton and Photo‐Fenton oxidation from Fenton‐based advanced oxidation processes for wastewater treatment arising from cosmetic automobile care products. The main factors that affected Fenton processes (pH, H₂O₂ doses, Fe²⁺ doses, and H₂O₂/Fe²⁺ ratios) were examined to optimize the operating conditions in batch reactors. The optimal pH values for both...

article

Fabrication of a novel biopolymer‐based nanocomposite (nanoTiO₂‐chitosan‐plum kernel shell) and adsorption of cationic dyes

Erol Pehlivan, Şerife Parlayıcı

Journal of Chemical Technology & Biotechnology > 96 > 12 > 3378 - 3387

BACKGROUND This study investigates the adsorption of methylene blue (MB) and malachite green (MG) onto a novel biosorbent. Rapid industrialization pollutes water resources, causing serious environmental problems. Physical and chemical treatments were performed for biosorbent modification. RESULTS In the present work, nano (n)TiO₂ was inserted into chitosan (Cts)‐epichlorohydrin (ECH)‐plum kernel...

article

A low‐cost screening system for kinetic analysis of Caligus rogercresseyi: New focus on pharmacological study of caligidosis disease

Jorge Parodi, Klaudia Hernandez, Maria‐Isabel Pizarro, Pamela Olivares‐Ferreti, more

Aquaculture Research > 52 > 11 > 5931 - 5935

The study of the parasite Caligus rogercresseyi (sea louse) and its effects on salmon farms in Chile is a complex challenge. One of these problems concerns the cost for testing potential treatments’ efficacy; the development of in vitro infection models is expensive because of the biosecurity protocol in general and animal care required. Our objective was to develop a low‐cost system to evaluate the...

article

Camellia nitidissima Chi leaf as pancreatic lipase inhibitors: Inhibition potentials and mechanism

Jiahui Chen, Xuehui Wu, Yue Zhou, Junhua He

Journal of Food Biochemistry > 45 > 9 > n/a - n/a

In this study, Camellia nitidissima Chi leaf extract was investigated for its compounds and pancreatic lipase inhibitory potentials. The interaction was determined using ultraviolet (UV) spectroscopy, circular dichroism (CD), fluorescence spectroscopy (FS), and molecular docking to understand the inhibiton, kinetic, and conformation of extraction–pancreatic lipase complex. C. nitidissima Chi leaf...

article

Characterization of hypercrosslinked polymer adsorbent based on carbazole to achieve higher CO₂ capture

Hamid Ramezanipour Penchah, Pegah Najafi, Ahad Ghaemi, Hossein Ghanadzadeh Gilani

Environmental Progress & Sustainable Energy > 40 > 4 > n/a - n/a

In this study, a hypercrosslinked polymer (HCP) adsorbent based on Friedel–Crafts reaction and carbazole as a monomer was synthesized and used for CO₂ capture. The HCP adsorbent is characterized by Fourier transform infrared spectroscopy, Brunauer, Emmett and Teller analysis, and energy dispersive spectroscopy. The effects of crosslinker to carbazole ratio, synthesis time and catalyst type, and their...

article

1‐Decene oligomerization by new complexes bearing diamine‐diphenolates ligands: Effect of ligand structure

Ahad Hanifpour, Naeimeh Bahri‐Laleh, Mehdi Nekoomanesh‐Haghighi, Albert Poater

Applied Organometallic Chemistry > 35 > 6 > n/a - n/a

A series of new titanium (IV) complexes bearing tetradentate diamine‐diphenolates, homologous to [ONNO] salan type ligands: [Ti{2,2′‐(OC₆H₂–4,6‐^tBu₂)₂NHC₃H₆NH}(Cl)₂] (Cat1), [Ti{2,2′‐(OC₆H₂–4,6‐^tBu₂)₂NHC₄H₈NH}(Cl)₂] (Cat2), and [Ti{2,2′‐(OC₆H₂–4,6‐^tBu₂)₂NHC₆H₄NH}(Cl)₂] (Cat3) were synthesized and fully characterized by elemental analysis and NMR spectroscopy. All three synthesized catalysts, after...

article

Selectivity and competition between N–H and C–H bond activation using an organoplatinum (II) complex

Fatemeh Niroomand Hosseini, S. Masoud Nabavizadeh, Peyman Hamidizadeh, Fatemeh Niknam, more

Applied Organometallic Chemistry > 35 > 6 > n/a - n/a

2‐(2′‐Pyridyl)benzimidazole (Hpbz), containing both C–H and N–H bonds available for activation, has been investigated to elucidate which bond is activated upon coordination to the Pt(II) precursor complex (PtMe₂(DMSO)₂), 1. On the basis of density functional theory (DFT), Hpbz is predicted to react with 1 through N–H bond activation of the benzimidazole ring in preference to C–H bond activation of...

article

Iron modified zeolite carrier for efficiently pharmaceutical pollutant degradation in heterogeneous electro‐Fenton: Influence factors and kinetic

Hadi Adel Niaei, Mohammad Rostamizadeh

Environmental Progress & Sustainable Energy > 40 > 3 > n/a - n/a

In this study, the high silica ZSM‐5 carrier was modified with the iron species and applied as a heterogeneous electro‐Fenton (EF) catalyst for pharmaceutical pollutant degradation. The carrier was prepared by the hydrothermal method and followed by impregnation. The physicochemical properties were evaluated by field emission scanning electron microscopes (FE‐SEM), FT‐IR, X‐Ray diffraction (XRD),...

article

Oxalate Intercalated Mg/Cr Layered Double Hydroxide as Adsorbent of Methyl Red and Methyl Orange from Aqueous Solution

Arini Fousty Badri, Novie Juleanti, Neza Rahayu Palapa, Yuliza Hanifah, more

Ecological Engineering & Environmental Technology > 2021 > Vol. 22, iss. 3 > 71--81

Mg/Cr layered double hydroxide (LDH) has been successfully synthesized by means of the coprecipitation method followed by the intercalation process using oxalate to form Mg/Cr-oxalate. The materials were characterized using XRD, BET, and FTIR and then applied as an adsorbent of anionic dyes i.e. methyl red (MR) and methyl orange (MO). MR and MO adsorption was studied through variations of adsorption...

article

Mechanism of the oxidation of nitric oxide with oxygen

Józef Głowiński, Józef Hoffmann, Marcin Wilk

Polish Journal of Chemical Technology > 2021 > Vol. 23, nr 1 > 31--36

Very fast reactions of forming higher nitrogen oxides set out an equilibrium framework for the course of the reaction of nitrogen monoxide oxidation. The slow course of reaction of nitrogen monoxide with oxygen permanently violates the created equilibria. In particular, the equilibrium of the oxidation reaction of nitrogen monoxide with nitrogen dioxide. The contribution of this reaction to the transformation...

article

Catalytic hydrotreatment of lignin‐derived pyrolysis bio‐oils using Cu/γ‐Al₂O₃ catalyst: Reaction network development and kinetic study of anisole upgrading

Majid Saidi, Pantea Moradi

International Journal of Energy Research > 45 > 6 > 8267 - 8284

Kinetic of anisole upgrading as a model compound of lignin‐derived pyrolysis bio‐oil to jet‐grade fuels via catalytic hydrotreatment process has been investigated. Hydrodeoxygenation (HDO) process has been performed in a fixed‐bed tubular reactor at operating temperature of 573 to 723 K, space velocity of 3 to 120 (anisole weight)/(catalyst weight × h), and hydrogen pressure of 8 bar. Benzene formation...

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Search results

Chromium VI adsorption from sodium chromate and potassium dichromate aqueous systems by hexadecyltrimethylammonium-modified zeolite-rich tuff

The Coupling of Local Strain and K⁺‐Ion Release Induced Phase Transition Heterogeneity in Tunnel MnO₂

Single‐walled carbon nanotubes (SWCNTs) as an efficient adsorbent for removal of reactive dyes from water solution: Equilibrium, kinetic, and thermodynamic

The kinetic and experimental study for the syngas production from ethanol dry reforming over a Ni‐Cu/La₂O₃ catalyst

Kinetics, mechanism, and simulation of hydrogen transfer reaction of α, β‐unsaturated aldehydes to allylic alcohols

Effect of molecular weight on crystallization behavior of poly (lactic acid) under isotherm and non‐isotherm conditions

CeO₂/TiO₂/SiO₂ nanocatalyst for the photocatalytic and sonophotocatalytic degradation of chlorpyrifos

Kinetic and thermodynamic characterization of lipase from Aspergillus melleus and its biocatalytic performance for degradation of poly(ɛ‐caprolactone)

The behaviour of tannic acid adsorption on fluorite surface: isotherm, kinetic and thermodynamic studies

Classical‐Fenton and Photo‐Fenton oxidation of wastewater arising from cosmetic automobile care products

Fabrication of a novel biopolymer‐based nanocomposite (nanoTiO₂‐chitosan‐plum kernel shell) and adsorption of cationic dyes

A low‐cost screening system for kinetic analysis of Caligus rogercresseyi: New focus on pharmacological study of caligidosis disease

Camellia nitidissima Chi leaf as pancreatic lipase inhibitors: Inhibition potentials and mechanism

Characterization of hypercrosslinked polymer adsorbent based on carbazole to achieve higher CO₂ capture

1‐Decene oligomerization by new complexes bearing diamine‐diphenolates ligands: Effect of ligand structure

Selectivity and competition between N–H and C–H bond activation using an organoplatinum (II) complex

Iron modified zeolite carrier for efficiently pharmaceutical pollutant degradation in heterogeneous electro‐Fenton: Influence factors and kinetic

Oxalate Intercalated Mg/Cr Layered Double Hydroxide as Adsorbent of Methyl Red and Methyl Orange from Aqueous Solution

Mechanism of the oxidation of nitric oxide with oxygen

Catalytic hydrotreatment of lignin‐derived pyrolysis bio‐oils using Cu/γ‐Al₂O₃ catalyst: Reaction network development and kinetic study of anisole upgrading

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