scholarly journals Ligands-Coordinated Zr-Based MOF for Wastewater Treatment

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 655 ◽  
Author(s):  
Xue-Qing Zhan ◽  
Fang-Chang Tsai ◽  
Lei Xie ◽  
Ke-Deng Zhang ◽  
Huan-Li Liu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Pore Size ◽  
Adsorption Capacity ◽  
Active Sites ◽  
High Pressures ◽  
Local Density ◽  
Physical Adsorption ◽  
Acid Orange 7 ◽  
Metal Organic ◽  
Non Local

Isostructural zirconium-based metal–organic frameworks (Zr-MOFs) have attracted the attention of researchers because of their remarkable stability at high temperatures and high pressures and their chemical stabilities against acids and bases. Due to this stability, Zr-MOFs can be utilized in adsorption research, and the adsorption performance of a Zr-MOF depends on the pore size and the surroundings of the MOF. In this study, as the dimensions changed and the adsorption was carried out, the Zr-MOF material remained stable, and the adsorption of the best state was achieved at 235 mg/g. Through the simulation of theoretical kinetic models of Zr-MOFs, we initially postulated that the adsorption capacity is proportional to the pore size and that acid orange 7 (AO7) was adsorbed by the MOFs. Afterwards, we verified our hypotheses through a series of Brunauer–Emmett–Teller (BET) data analysis; non-local density function theory (NLDFT) was mainly used to analyze the data. Moreover, we determined that physical adsorption occurs on the surface of the MOFs during the adsorption process, while chemisorption occurs in the form of dye molecules combining with active sites. Ultimately, we concluded that the larger the pore size, the stronger the adsorption capacity, and this contribution casts a new light on the issue of wastewater treatment.

scholarly journals Study of the adsorption of an organic pollutant onto a microporous metal organic framework

2020 ◽  
Author(s):  
Mansouri Taki Eddine Mohammed ◽  
Nibou Djamel ◽  
Trari Mohamed ◽  
Samira Amokrane
Keyword(s):  
Methyl Orange ◽  
Adsorption Capacity ◽  
Active Sites ◽  
Physical Adsorption ◽  
Metal Organic Framework ◽  
Specific Interaction ◽  
Maximum Adsorption Capacity ◽  
Film Diffusion ◽  
Metal Organic ◽  
Organic Framework

Abstract In this study, the microporous Metal Organic Framework-5 (MOF-5) has been synthesized to be used to remove methyl orange by adsorption. The adsorption experiments exhibit a good adsorption capacity at a catalyst dose of 0.1 g L−1 and for an initial concentration of 200 mg L−1, whereas the performance is stable over a wide pH range. The equilibrium adsorption data showed a sigmoidal course, which is well fitted by the Dubinin-Astakhov model applicable for physical adsorption processes (E = 0.055 kJ mol−1) onto heterogeneous surfaces and a more homogeneous pore structure (n = 9.9), with a maximum adsorption capacity of 1248.35 mg g−1. As can be observed from the evaluation of the kinetic data, the surface of the adsorbent is heterogeneous with different active sites for Methyl Orange (MO) adsorption. Moreover, based on the rate constant, it can be suggested that there is a specific interaction like electrostatic interaction between MO and the adsorbent for rapid and high uptake of the dye, whereas the adsorption phenomenon is reversible. According to the adsorption mechanisms, intra-particle and film diffusion models simultaneously controlled the rate sorption, which was confirmed by the calculated intra-particle diffusion and the film diffusion coefficients. The evaluation of the thermodynamic parameters revealed that the MO adsorption is spontaneous, endothermic and the randomness increases with the adsorption of MO.

A metal–organic framework with suitable pore size and dual functionalities for highly efficient post-combustion CO2 capture

2019 ◽  
Vol 7 (7) ◽  
pp. 3128-3134 ◽  
Author(s):  
Hui-Min Wen ◽  
Caijun Liao ◽  
Libo Li ◽  
Ali Alsalme ◽  
Zeid Alothman ◽  
...  
Keyword(s):  
Porous Material ◽  
Pore Size ◽  
Adsorption Capacity ◽  
Co2 Capture ◽  
High Selectivity ◽  
Metal Organic Framework ◽  
Heat Of Adsorption ◽  
Highly Efficient ◽  
Metal Organic ◽  
Organic Framework

A novel porous material was realized for highly efficient post-combustion CO2 capture with high CO2 adsorption capacity, high selectivity and moderate heat of adsorption, mainly attributed to the suitable pore size and dual functionalities.

Facile simulation of carbon with wide pore size distribution for electric double-layer capacitance based on Helmholtz models

2015 ◽  
Vol 3 (32) ◽  
pp. 16535-16543 ◽  
Author(s):  
Wei Hsieh ◽  
Tzyy-Leng Allen Horng ◽  
Hsin-Chieh Huang ◽  
Hsisheng Teng
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Double Layer ◽  
Density Functional ◽  
Local Density ◽  
Double Layer Capacitance ◽  
Local Density Functional Theory ◽  
Non Local ◽  
Forms Of Carbon

Incorporation of surface-based capacitances (C/S) simulated by Helmholtz models with pore size distribution obtained from the non-local density functional theory precisely predicts the double-layer capacitance of distinct forms of carbon.

Adsorption and recovery of nonylphenol ethoxylate on a crosslinked β-cyclodextrin-carboxymethylcellulose polymer

2010 ◽  
Vol 61 (9) ◽  
pp. 2293-2301 ◽  
Author(s):  
Danielle Bonenfant ◽  
Patrick Niquette ◽  
Murielle Mimeault ◽  
Robert Hausler
Keyword(s):  
Adsorption Capacity ◽  
Atmospheric Pressure ◽  
Active Sites ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Physical Adsorption ◽  
Polymer Network ◽  
Homogeneous Distribution ◽  
Nonylphenol Ethoxylate ◽  
Monolayer Coverage

A study of adsorption/recovery of nonylphenol 9 mole ethoxylate (NP9EO) on a crosslinked β-cyclodextrin-carboxymethylcellulose (β-CD-CMC) polymer was carried out by ultraviolet-visible (UV-vis) and Fourier transform infrared (FTIR) spectroscopies. The adsorption was performed in mixtures containing 500 mg of the β-CD-CMC polymer and aqueous NP9EO solutions at concentrations 12–82 mg/L, whereas the recovery of NP9EO was effectuated by shaking the β-CD-CMC polymer loaded with methanol. The assays were made at 25°C and atmospheric pressure under agitation. The results have shown that the adsorption is a rapid process and the β-CD-CMC polymer exhibits a high NP9EO adsorption capacity of 83–92 w% (1.1–6.8 mg NP9EO/g β-CD-CMC polymer) dependent of the initial NP9EO concentration in liquid phase. This adsorption may involve the formation of an inclusion complex β-CD-NP9EO and a physical adsorption in the polymer network. The adsorption equilibrium measurements, which were analyzed using the Langmuir isotherm, have indicated a monolayer coverage and the homogeneous distribution of active sites at the surface of the β-CD-CMC polymer. Moreover, the negative value obtained for the free energy change (−13.2 kJ/mol) has indicated that the adsorption process is spontaneous. In parallel, the β-CD-CMC polymer exhibited a high NP9EO recovery efficiency of 97 w% that may occur through a decrease of binding strength between β-CD-CMC polymer and NP9EO. Together, these results suggest that the β-CD-CMC polymer could constitute a good adsorbent for removing nonylphenol ethoxylates from wastewater due to its high adsorption capacity and non-toxic character of β-CD and CMC to environment.

scholarly journals Removal of Acid Orange 7 from Aqueous Solution by Metal-Organic Frameworks

Crystals ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 17 ◽  
Author(s):  
Sungwon Yoon ◽  
James Calvo ◽  
Monica So
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Bonding ◽  
Adsorption Capacity ◽  
Metal Clusters ◽  
Metal Organic Frameworks ◽  
Acid Orange 7 ◽  
Acid Orange ◽  
Zeta Potentials ◽  
Metal Organic ◽  
Capacity Data

We investigated the removal of a harmful anionic dye, acid orange 7 (AO7), from aqueous solution using metal-organic frameworks (MOFs). We prepared four different MOFs (ZIF-8, ZIF-67, UiO-66, UiO-66-NH2) by solvothermal reactions and then tested their adsorption of AO7. Infrared spectra and adsorption capacity data confirmed the removal of AO7 from aqueous solution. The factors we investigated affecting adsorption capacity include variation of the organic linkers and metal clusters of the MOFs. Our results suggest that the hydrogen bonding, π–π interactions, and zeta potentials facilitate the removal of AO7 from water. Of the four MOFs examined, ZIF-67 exhibited the highest adsorption capacity of AO7 and can be regenerated easily.

scholarly journals Study on removal of volatile organic compounds by metal-organic framework composite material

2021 ◽  
Author(s):  
Yong-I Xiao ◽  
Joy Thomas ◽  
Nhat-Thien Nguyen ◽  
Thuy-Trang Le ◽  
Chang Tang Chang
Keyword(s):  
Volatile Organic Compounds ◽  
Specific Surface ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Organic Compounds ◽  
Specific Surface Area ◽  
Physical Adsorption ◽  
Metal Organic Framework ◽  
Volatile Organic ◽  
Metal Organic

Abstract For decades, people have made many efforts to improve air quality. Volatile Organic Compounds (VOCs) in the chemical and textile industries are indeed listed as serious problems that need to be controlled to avoid the emission of toxic substances and reduce the concentration of ozone in the atmosphere. In this study, a novel β-cyclodextrin-metal-organic framework (β-CD-MOF) was produced by a green and simple method to achieve the goal of making environmentally friendly adsorption materials through a green process. Compared with pure β-CD (the specific surface area is only 22 m2/g), β-CD-MOF has higher crystallinity and larger specific surface area (up to 869 m2/g). Through the dynamic acetone adsorption device, the adsorption capacity of β-CD-MOF for acetone can reach 211 mg/g at room temperature, which is higher than that of activated carbon (the adsorption capacity is only about 192 mg/g). In addition, the adsorption of acetone by β-CD-MOF is a single-layer physical adsorption behavior through isothermal adsorption simulation, and it is known from the kinetic simulation that the adsorption mainly occurs on the surface, and the limiting condition of the adsorption is mainly external mass transfer. According to the results of thermodynamic analysis, the adsorption reaction is a spontaneous and exothermic reaction. Because the adsorption is a physical adsorption behavior, β-CD-MOF adsorbent has good reusability. After four cycling experiments, the adsorption capacity of acetone is only reduced by about 10%. This research has provided an environmentally friendly, low-cost, and high-efficiency solution for the removal of VOCs.

Polyethersulfone ultrafiltration membrane incorporated with ferric-based metal-organic framework for textile wastewater treatment

2021 ◽  
Vol 270 ◽  
pp. 118819
Author(s):  
Nur Azizah Johari ◽  
Norhaniza Yusof ◽  
Woei Jye Lau ◽  
Norfadhilatuladha Abdullah ◽  
Wan Norharyati Wan Salleh ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Metal Organic Framework ◽  
Textile Wastewater ◽  
Ultrafiltration Membrane ◽  
Metal Organic ◽  
Textile Wastewater Treatment ◽  
Organic Framework

scholarly journals Study of deactivation in mesocellular foam carbon (MCF-C) catalyst used in gas-phase dehydrogenation of ethanol

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yoottapong Klinthongchai ◽  
Seeroong Prichanont ◽  
Piyasan Praserthdam ◽  
Bunjerd Jongsomjit
Keyword(s):  
Catalytic Activity ◽  
Pore Size ◽  
Gas Phase ◽  
Surface Area ◽  
Active Sites ◽  
Operating Temperature ◽  
Coke Formation ◽  
Ethanol Conversion ◽  
Deactivation Of Catalyst ◽  
Dehydrogenation Of Ethanol

AbstractMesocellular foam carbon (MCF-C) is one the captivating materials for using in gas phase dehydrogenation of ethanol. Extraordinary, enlarge pore size, high surface area, high acidity, and spherical shape with interconnected pore for high diffusion. In contrary, the occurrence of the coke is a majority causes for inhibiting the active sites on catalyst surface. Thus, this study aims to investigate the occurrence of the coke to optimize the higher catalytic activity, and also to avoid the coke formation. The MCF-C was synthesized and investigated using various techniques. MCF-C was spent in gas-phase dehydrogenation of ethanol under mild conditions. The deactivation of catalyst was investigated toward different conditions. Effects of reaction condition including different reaction temperatures of 300, 350, and 400 °C on the deactivation behaviors were determined. The results indicated that the operating temperature at 400 °C significantly retained the lowest change of ethanol conversion, which favored in the higher temperature. After running reaction, the physical properties as pore size, surface area, and pore volume of spent catalysts were decreased owing to the coke formation, which possibly blocked the pore that directly affected to the difficult diffusion of reactant and caused to be lower in catalytic activity. Furthermore, a slight decrease in either acidity or basicity was observed owing to consumption of reactant at surface of catalyst or chemical change on surface caused by coke formation. Therefore, it can remarkably choose the suitable operating temperature to avoid deactivation of catalyst, and then optimize the ethanol conversion or yield of acetaldehyde.

Metal-organic-framework derived hollow manganese nickel selenide spheres confined with nanosheets on nickel foam for hybrid supercapacitors

2021 ◽  
Author(s):  
Bahareh ameri ◽  
Akbar Mohammadi Zardkhoshoui ◽  
Saied Saeed Hosseiny Davarani
Keyword(s):  
Active Sites ◽  
Nickel Foam ◽  
Metal Organic Framework ◽  
High Surface ◽  
Metal Organic Frameworks ◽  
High Surface Area ◽  
Supercapacitive Performance ◽  
Hybrid Supercapacitors ◽  
Porous Networks ◽  
Metal Organic

Metal-organic frameworks (MOFs) derived nanoarchitectures have special features, such as high surface area (SA), abundant active sites, exclusive porous networks, and remarkable supercapacitive performance when compared to traditional nanoarchitectures. Herein,...

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