Characteristics Of Sorbents Research Articles

Characteristics of MgO-Based Sorbents for CO <sub>2</sub> Capture at Elevated Temperature and Pressure

Characteristics of MgO-Based Sorbents for CO <sub>2</sub> Capture at Elevated Temperature and Pressure

Determination of the parameters of the porous structure of carbon sorbents based on Kuzbass fossil coals by the method of low-temperature nitrogen adsorption

The paper presents a technique for measuring the parameters of the porous structure of carbon sorbents obtained on the basis of Kuzbass fossil coals using an ASAP 2020 “Micromeritics” analyzer. The conditions for sample preparation were selected, which make it possible to record reproducible isotherms of low-temperature adsorption-desorption of nitrogen (77K) by the studied samples of carbon sorbents based on fossil coal of various grades. The textural characteristics of the porous structure of carbon sorbents were determined, such as the specific surface area (SBET, m2/g), the total pore volume (VΣ, cm3/g), the volume of micro-and mesopores (Vmicro, Vmeso, cm3/g) of the studied carbon sorbents. The textural characteristics of the porous structure of carbon sorbents were calculated from the obtained isotherms of low-temperature (77K) nitrogen adsorption-desorption. The textural characteristics of carbon sorbents were calculated by various methods implemented by the software of the ASAP 2020 analyzer “Micromeritics”: BET, Langmuir, DFT, t-Plot, Dubinin-Radushkevich, Dubinin-Astakhov, MP-method, Horvath-Kawazoe, BJH and Dollimore-Heal. The obtained values of the textural characteristics of the porous structure of carbon sorbents, calculated by various methods, make it possible to obtain more detailed information about the objects of study and to determine the scope of their further application.

Study of the structure and morphology of carbon sorbents

The paper presents the results of a study of the morphology of carbon sorbents from Kuzbass coal. Carbon sorbents were obtained by chemical activation of the initial coal with potassium hydroxide at a temperature of 800 °C and a KOH/coal ratio of 1 g/g. It was shown that alkaline activation has no significant effect on the ash content of the obtained carbon sorbents. The elemental composition of the obtained carbon sorbents practically does not differ and remains constant when the elemental composition of the initial coal changes. The morphology of the surface of the initial coal and sorbents was studied by the SEM method, and the different nature of the surface of carbon sorbents based on coal was shown. For carbon sorbents from bituminous coals of low stages of metamorphism, a spongy structure is characteristic, for carbon sorbents from bituminous coals of high stages, it is layered. The physicochemical characteristics of carbon sorbents were determined. A study was carried out for the content of total and water-soluble iron for the amount of water-soluble ash.

Study of the porous structure of carbon sorbents based on Kuzbass coal at various stages of metamorphism

The work is devoted to the investigation of the porous structure of carbon sorbents prepared on the basis of long-flame, gas, low-caking and lean coal of Kuzbass. Carbon sorbents were obtained by alkaline activation with potassium hydroxide at 800 °C and a KOH/coal (RKOH) ratio of 0.5 g/g. Using the method of low-temperature nitrogen adsorption (analyzer ASAP-2400), the values of the textural characteristics of carbon sorbents based on coal of different stages of metamorphism were determined: pore volume, micropore volume and specific surface area. It is shown that the carbon sorbents obtained in this work are predominantly microporous (more than 80% by volume). A carbon sorbent based on long-flame coal has the greatest texture characteristics; its specific surface area is 1220 m2/g and a pore volume of 0.54 cm3/g.

Technological essence of carbon production sorbents based on vegetable raw materials and their economic efficiency

It is shown that due to the rapid increase in the number of vehicles, the use of fuels and lubricants is increasing, which, despite all measures and precautions, pollute the environment with harmful and toxic products through spills and spills. It has been studied how oil products and their decomposition products that enter the environment pollute the soil and water. The efficiency of soil and water treatment depends on the method, technology, method, tools and techniques. The method of sorption (absorption) is becoming especially popular and widespread in the purification of soils and water from pollution. It is analyzed how the method of sorption, at relatively low cost, provides effective purification of soil and water from petroleum products. The technologies of obtaining carbon sorbents by the method of carbonization from by-products of plant origin (sawdust, straw, leaves), the volumes of which for the synthesis of carbon sorbents are practically not limited, are substantiated. The essence of the process of carbonization of carbon sorbents on the basis of vegetable raw materials is highlighted. Physical, chemical, structural, sorption and absorption characteristics of plant raw materials and carbon sorbents obtained from it are presented. The ecological, economic advantages and efficiency of carbon sorbents of vegetable origin for purification from oil products, in comparison with other purification methods are revealed.

Removal of diesel pollution by biochar - support in water remediation

Water contaminated with diesel oil represents one of the greatest challenges in waste water management. Water soluble fraction (WSF) is of particular interest because of its toxicity to aquatic organisms and discharge regulations set by environmental authorities. Biochar sorbents have attracted great attention, due to their low cost origin and advantageous properties as well as high sorption capacities in sorption processes. In this study, we have reported the synthesis and characteristics of novel biochar sorbent made from waste lignocellulosic biomass (peach stones (PS)) and evaluated its possible application in removal of diesel WSF from synthetic water. Physiochemical characteristics of the biochar sample were analysed by scanning electron microscopy (SEM), Brunauer?Emmett?Teller (BET) method, and Fourier-transform infrared spectroscopy (FTIR), along with the elemental analysis. Characterisation of PS biochar (PS-B) indicated high multi porous surface area (159.1 m2 g-1) with the average pore diameter 2.7 nm. FTIR results indicated higher presence of aromatic compounds in PS-B as compared to PS. The sorption experiments performed in a batch system using PS-B resulted in more than 95 % removal of diesel WSF, reaching equilibrium after 5 h. Equilibrium data were well fitted by Freundlich isotherm, while the pseudo-second order equation fitted well the kinetic data, indicating chemisorption involving valency forces through the sharing/exchange of electrons between the sorbent and PS-B. Applications of ecotoxicology tests based on a microbial biosensor (Aliivibrio fischeri) have shown a significant toxicity reduction of water sample after the treatment with biochar.

Synthesis of 2D and 3D hierarchical β-FeOOH nanoparticles consisted of ultrathin nanowires for efficient hexavalent chromium removal

The self-assembly of 1-dimensional nanorods into free-standing multi-dimensional (2D and 3D) nanostructures is a considerable challenge. Here, 2D β-FeOOH nanobundles (NBs) and 3D spiky particles (SPs) were prepared without a substrate using a one-pot hydrothermal method. The oriented aggregation of nanoparticles (NPs) induced at the initial stage an unusual growth pathway beyond a reversed crystal growth route, forming spindle-like or spiky structure, which was confirmed by structural analyses. Then, with a surface-to-core extension of crystallization and nanorod self-assembly, 2D NBs with ultrathin and well-aligned nanorods and 3D SPs were finally generated. The reduction of the surface free energy served as a primary driving force for the oriented self-assembly. The initial concentrations of sodium sulfate and polyethyleneimine, which are used as reducing reagent and electrostatic stabilizer, are crucial adsorption parameters. The adsorption capacity of the NBs and SPs for Cr(VI) was 68.3 mg g−1 and 83.4 mg g−1, respectively. The adsorption mechanism study showed that electrostatic interaction and reduction concomitantly affected the adsorption. The molecular dynamic simulation indicated that the adsorption performance depends on the crystallographic surface of the materials. The suggested synthesis route provides an atypical strategy to prepare 2D and 3D nanostructures with promising sorbent characteristics.

Влияние природы ионных жидкостей на сорбцию бензимидазола и некоторых его производных из водно-ацетонитрильных растворов на октадецилсиликагеле

Исследование сорбции биологически активных соединений (БАС) из жидких растворов явля-ется актуальным направлением современной науки и практики, так как касается многих сфер деятель-ности человека, таких как, например, экология и медицина. БАС являются потенциальными активными компонентами лекарственных средств, а изучение их сорбции может помочь в решении проблемы кон-троля качества фармацевтических препаратов и субстанций, разработки российских аналогов зарубеж-ных лекарств, а также проблему очистки природных водоемов и сточных вод. Наиболее подходящим методом исследования лекарственных препаратов является метод обращенно-фазовой высокоэффек-тивной жидкостной хроматографии (ОФ ВЭЖХ). Однако в случае исследования БАС методом ОФ ВЭЖХ возникает ряд проблем, таких как, например, денатурация белков; сложность разделения смесей лекарственных средств, а также проблема сильной зависимости факторов удерживания от свойств сор-бента. Возможным решением этих проблем могут стать ионные жидкости (ИЖ), которые, благодаря своей двойственной природе, позволяют поддерживать ряд важных для хроматографии межмолекуляр-ных взаимодействий как с поверхностью сорбента, так и с аналитами, что делает их перспективными добавками в ОФ ВЭЖХ.В связи с вышесказанным, целью настоящего исследования было изучение влияния природы ИЖ на удерживание октадецилсиликагелем бензимидазола и его впервые синтезированных производ-ных из водно-ацетонитрильных элюентов и элюентов, содержащих растворенный 1-бутил-2,3-димети-лимидазолий тетрафторборат ([BdMIM] [BF4]) и 1-бутил-3-метилимидазолий бромид ([BMIM][Br]). Рассмотрено влияние состава водно-ацетонитрильного раствора на факторы удерживания биологиче-ски активных производных бензимидазола на октадецилсиликагеле в рамках моделей Снайдера-Соче-винского и Сочевинского- Вахмайстера и рассчитаны соответствующие угловые коэффициенты. Пока-зано, что зависимости для некоторых сорбатов не линейные и соответственно, их удерживание не мо-жет быть описано в рамках используемых полуэмпирических моделей.При сравнении величин угловых коэффициентов уравнений Сочевинского- Вахмайстера и Снайдера-Сочевинского показано, что на комплекс межмолекулярных взаимодействий влияет природа ионных жидкостей, а также строение анализируемых соединений. Выявлено, что система с [BdMIM][BF4] характеризуется наименьшими значениями n и S для всех соединений, а также показано, что в этой системе модели Сочевинского-Вахмайстера и Снайдера-Сочевинского не позволяют описать удерживание следующих сорбатов: бензимидазола (сорбат № 1), 1,2-бис-(гидроксиметил)-бензимида-зола (сорбат № 3) и 2-бензил-1-(3-фенилпропил)-1H-бензимидазола (сорбат № 6).

Experimental and DFT studies on the characteristics of PbO/PbCl2 adsorption by Si/Al- based sorbents in the simulated flue gas

Mineral oxides are effective in-furnace sorbents used to control lead (Pb) emissions in flue gas at high temperatures. In this paper, the PbO/PbCl2 adsorption characteristics of sorbents were investigated via experimental and density functional theory (DFT) methods. The results show that Si/Al-based compounds can chemically adsorb Pb, and the adsorption is related to the Si-O and Al-O bonds in the sorbents. Exposed Si and O atoms on SiO2 surfaces and exposed Al and O atoms on Al2O3 surfaces are the active sites for Pb adsorption, and PbO is easier to remove than PbCl2. Pb adsorption is promoted in a mixture of SiO2 and Al2O3. Doping Si atoms into Al2O3(100) promotes PbO adsorption, and doped three-coordinate Si atoms have a more obvious promotion effect than doped two-coordinate Si atoms. Doping Al atoms into SiO2(001) has no obvious effect on PbO adsorption. The effect of temperature on Pb adsorption was studied by thermodynamic analysis. The Gibbs free energy difference for PbO adsorption on SiO2(001) increases from −373.04–32.42 kJ/mol as the temperature increases from 300 to 1800 K. High-temperature calcination changes the bond length and bond angle of the system, affecting the stabilities of atomic configurations and decreasing the Pb adsorption capacity.

A sorbent based on polyvinyl formal and polyacrylic acid for the removal of heavy metals from water solutions

The characteristics of a hybrid pH-sensitive hydrogel sorbent based on polyvinyl formal and polyacrylic acid, synthesized by radical copolymerization, were investigated in the process of removing copper (II), zinc (II) and nickel (II) metal ions from water solutions. A high efficiency of the extraction (up to 96%) of metal cations (Cu(II)>Zn(II)Ni(II)) was reveled at their concentration of up to 250 mg L–1 in the pH range of 5.8 to 6.8. The experimental data were analyzed by using theoretical kinetic models and adsorption isotherms. The developed polymer sorbent was shown to be promising for removing heavy metals, even after its multiple regeneration.

Development of thermosyphon controlled adsorptive natural gas storage system

Natural gas is considered a potentially available and ecologically preferable fuel, comparing to other liquid fossil fuels. Safe and sustainable energy storage device is one of the bases for changing the current energy systems. The system is to use tank packed with porous solid that can selectively adsorb methane at a gas pressure of 3.5–6 MPa. This low storage pressure in the gas tank reduces both the cost of compression and that of the storage tank, and poses less of a safety hazard than higher pressures used for compressed natural gas. The focus was the study of the effect exerted by the hybrid cooling technology and sorbent characteristics on the gas reserve. For dual-fuel internal combustion engines, a modular adsorbed natural gas (ANG) tank with an active and passive thermal control system was proposed. Dynamic charging is analyzed using a numerical model of the real properties of the sorbent and reservoir design. Novel thermosyphons with annular channels in long horizontal evaporators and a cold gas circulation loop made it possible to stimulate gas adsorption and avoid the rise of temperature in the sorbent bed during filling the tank with a gas at gas stations. They are capable of transporting energy for a distance of some meters which is difficult to be realized by horizontally disposed conventional thermosyphons and heat pipes.

Fabric phase sorptive extraction combined with high-performance-liquid chromatography-photodiode array analysis for the determination of seven parabens in human breast tissues: Application to cancerous and non-cancerous samples

An improved pretreatment approach of human breast tissue is demonstrated for subsequent analysis of seven parabens including methyl paraben (MPB), ethyl paraben (EPB), propyl paraben (PPB), butyl paraben (BPB), isopropyl paraben (iPPB), isobutyl paraben (iBPB), and benzyl paraben (BzPB). Specifically, a well-designed homogenization procedure, conjugated with an optimized fabric phase sorptive extraction (FPSE) protocol, resulted in a carefully outlined sample preparation process as part of a green, simple, sensitive, economical and fast HPLC-PDA analytical method in agreement with Green Analytical Chemistry (GAC) demands. Among all tested FPSE membranes, the highest extraction efficiency was achieved by employing sol-gel poly(tetrahydrofuran) (sol-gel PTHF) coating on 100% cotton cellulose fabric that represents a medium polarity microextraction device, which combined the advanced material characteristics of sol-gel sorbent and the rich surface chemistry of an inherent porous cellulose fabric substrate. The chromatographic separation was accomplished with a Spherisorb C18 column and an isocratic mobile phase consisted of ammonium acetate and acetonitrile at a flow rate of 1.4 mL/min. The total analysis time was 13.6 min. The analytical adequacy of the composite sample preparation and chromatographic separation method was strongly evidenced by its successful application in the bioanalysis of real cancerous and non-cancerous tissue samples originated from different sub regions of human breast including axila, the upper left and the right quadrant. In all samples, at least one paraben was detected, while 35% of the samples were tested positive for all seven target parabens. Moreover, concentration levels of parabens in cancerous tissues were unambiguously higher than in healthy tissues. The obtained results underlined bioaccumulation potential of parabens in human breast tissue as a consequence of constant low-dose exposure of humans, despite the statutory concentration limits. The developed methodology has demonstrated to be suitable and efficient for future epidemiological and toxicological studies.

Modelling of a fluidized bed carbonator reactor for post-combustion CO2 capture considering bed hydrodynamics and sorbent characteristics

This manuscript presents a general model for the fluidized bed carbonator reactor of the Calcium Looping (CaL) process based on bed hydrodynamics, kinetics and sorbent properties. The model proposed relies on the Kunii–Levenspiel theory for circulating fluidized beds in the fast fluidization regime and considers recent findings on the CO2 capture properties of CaO, including the effects of the diffusion-controlled carbonation stage and CaO modification by means of additives. By performing a sensitivity analysis, it is found that the solids inventory in the carbonator and superficial gas velocity are the main operational and hydrodynamic factors affecting the CO2 capture efficiency. Decay constant of the fraction of solids in the lean region and fraction of solids in the dense region are also identified as two important model parameters. Model predictions are shown to agree with experimental results retrieved from pilot-scale tests. The main novelty of the model is the consideration of a CaO/Al2O3 composite either as main CO2 sorbent used in the carbonator or as a make-up flow fed into the calciner. Using CaO/Al2O3 as the main CO2 sorbent leads to a 14.17% loss of capture efficiency after 100 cycles compared to 72.81% when using limestone derived CaO. It is demonstrated that feeding a very low ratio (~0.1) of the CaO/Al2O3 composite or a rather high ratio (~5) of limestone as makeup flow, leads to a significant improvement of the capture efficiency. The results obtained may be relevant for optimizing CaL operation conditions to be used in power plants.

Harnessing a Novel Machine-Learning-Assisted Evolutionary Algorithm to Co-optimize Three Characteristics of an Electrospun Oil Sorbent.

The optimization of materials is challenging as it often involves simultaneous manipulation of an assembly of condition parameters, which generates an enormous combinational space. Thus, optimization models and algorithms are widely adopted to accelerate material design and optimization. However, most optimization strategies can poorly handle multiple parameters simultaneously with limited prior knowledge. Herein, we describe a novel systematic optimization strategy, namely, machine-learning-assisted differential evolution, which combines machine learning and the evolutionary algorithm together, for zero-prior-data, rapid, and simultaneous optimization of multiple objectives. The strategy enables the evolutionary algorithm to "learn" so as to accelerate the optimization process, and also to identify quantitative interactions between the condition parameters and functional characteristics of the material. The performance of the strategy is verified by in silico simulations, as well as an application on simultaneously optimizing three characteristics, namely, water contact angle, oil absorption capacity, and mechanical strength, of an electrospun polystyrene/polyacrylonitrile (PS/PAN) material as a potential sorbent for a marine oil spill. With only 50 tests, the optimal fabrication parameters were successfully located from a combinatorial space of 50 000 possibilities. The presented platform technique offers a universal enabling technology to identify the optimal conditions rapidly from a daunting parameter space to synthesize materials with multiple desired functionalities.

Characteristics of Natural Mineral Sorbent for Water Treatment of Drinking Water from Underground Sources

The results of research of sorption characteristics of natural mineral material – marsh ferromanganese ore are presented. Indicators of physical properties and mechanical strength, specific surface area of grains of ore samples were determined. The high efficiency of extraction of manganese and iron ions from underground waters by this natural material without the use of additional reagents is revealed. The kinetics of the sorption process was studied. It is shown that the extraction of manganese and iron ions from water solutions by marsh ferromanganese ore proceeds by a sorption-catalytic mechanism. For each ion, the values of the sorption capacity of the sorbent, the sorption equilibrium constants, and the kinetic parameters of the sorption process are calculated.

Enhanced Arsenic(V) Removal on an Iron-Based Sorbent Modified by Lanthanum(III).

Modification of a commercial iron oxide ion exchanger (Arsen Xnp) was carried out to enhance the removal of arsenic(V) ions. The modification consisted of the adsorption of lanthanum(III) ions on the Arsen Xnp surface. After adsorption, the material was dried at 313 K to obtain the modified ion exchanger Arsen Xnp-La(III). The modification process itself was tested for optimal pH, kinetics, and equilibrium adsorption isotherm study. Accurate sorbent characteristics were made using, among others, SEM, FTIR, and nitrogen adsorption/desorption isotherms. Then, various tests were carried out to compare the adsorption properties of the modified and unmodified material. It turned out that the tested material was able to completely remove arsenic from an aqueous solution with an initial concentration of up to 50 mg/dm3. Without modification, it was not possible to reach the WHO recommended 10 μg/dm3 arsenic limit even at an initial concentration of 25 mg/dm3. Moreover, the maximum sorption capacity increased from 22.37 to 61.97 mg/g after modification (3 times greater than before modification). It is worth noting that the process of removing arsenic on Arsen Xnp-La(III) is fast—equilibrium is reached after about 120 min. Under almost neutral conditions, precipitation and adsorption can be the main mechanisms of As(V) removal. After modification, the removal capacity was enhanced by the co-precipitation and adsorption by exchange of the OH– group with arsenic ions. Such La(III) based adsorbent can be successfully applied in wastewater purification and displays superior performance for removing arsenic.

Preparation and Evaluation of Methacrylate-based Reversed-phase Sorbents for Solid-phase Extraction of Polar Compounds

In solid-phase extraction (SPE), hydrophilic-lipophilic balance (HLB) type sorbents prepared by copolymerization with divinylbenzene (DVB) and polar monomers are widely used. The hydrophobicity of the HLB-type sorbents depends on DVB as the main component, and the extraction efficiency for polar compounds is enhanced by interaction with the polar groups introduced by polar monomers. On the other hand, high adsorption ability, due to the hydrophobicity of DVB, adversely affects the rapid elution of trapped compounds. In this study, the non-aromatic sorbents that has high adsorption ability for polar compounds, and can rapidly elute polar compounds including aromatic rings were developed. Porous polymer particles were prepared with trimethylolpropane trimethacrylate (TMPT), and the solid-phase extraction characteristics were evaluated. By optimizing the pore characteristics of TMPT-type sorbent, it was possible to effectively extract the nucleobases and nucleosides whose extraction efficiency was comparable to that of the commercial HLB-type sorbent. Furthermore, in order to improve the hydrophobicity of the TMPT-type sorbents, non-aromatic sorbents copolymerized with stearyl methacrylate (SMA) were prepared. However, the adsorption abilities of the TMPT-type sorbent could not be improved. The adsorption and desorption properties of the non-aromatic sorbents were evaluated using the TMPT-type sorbent. The aromatic polar compounds were able to be strongly sorbed to the TMPT-type sorbent, but they could be rapidly eluted by low concentration organic solvent as eluent. These results suggest that the TMPT-type sorbents are useful for a solid-phase extraction of the polar compounds and will solve the problem of the poor desorption in the HLB-type sorbents containing DVB.

Development of the Technology for Processing Plant Breeding By-Products to Obtain Biosorbent

This study focuses on the potential transforming sunflower husk wastes into innovative green products to be used for the recultivation of contaminated soils. This transformation makes it possible to utilize the large quantity plant breeding by-products to obtain a highly porous biosorbent. Optimal conditions for the preparation of bisorbents can be determined based on measurements of their specific surface and porosity. It is shown that structural characteristics of sorbent depend on conditions of the pyrolysis of primary raw material. Optimal conditions for obtaining biosorbent with a specified proportion of mesoand micropores and high specific surface are performed under three-stage pyrolysis as given by following conditions: sample holding time of 10-30 min, final temperature 700°С, and heating rate 15°С/min. A 3-month incubation study was conducted to investigate its performance in stabilization of copper contamination in Fluvisol. The sequential extraction procedure showed that the 1% sunflower husks biosorbent treatment reduced the mobile pool (exchange and carbon-bonded fractions) of Cu from 8 to 4%, respectively, compared to the contaminated soil. Cu is found to be tightly bonded owing to the increase of the residual and organic matter-bonded metal fractions. Owing to its adsorptive properties, biosorbent amendment of coppercontaminated soils appears as a promising approach to reduce the pollutant mobility and bioavailability.

Extended Rate Constant Distribution Model for Sorption in Heterogeneous Systems. 1: Application to Kinetics of Metal Ion Sorption on Polyethyleneimine Cryogels

Here, we suggest a theoretical approach to investigations of sorption kinetics based on determination of intrinsic characteristics of heterogeneous sorbents (affinity, quantity, and distribution of...

UIO-66-NH2 Packed Needle Trap for Accurate and Reliable Sampling and Analysis of the Halogenated Volatile Organic Compounds in Air

ABSTRACT This paper introduces a novel inside needle adsorption trap device based on UiO-66-NH2 adsorbent for the sampling and analysis of halogenated volatile organic compounds (HVOCs), including chloroform, carbon tetrachloride, and perchloroethylene in air. In this study, the UiO-66-NH2 adsorbent was first synthesized and then packed into spinal needles (22 Gauge). This study was conducted both in the laboratory and in the field. Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR) and X-Ray Diffraction (XRD) were used to investigate the sorbent characteristics. In this study, Response Surface Methodology (RSM) and Central Composite Design (CCD) were utilized to optimize the effects of sampling parameters and desorption parameters on needle trap device (NTD) performance. In this regard, a constant concentration of the compounds of interest was injected into a standard chamber, and then the packed NTD was used for the sampling of HVOCs under a given condition. According to the results, the maximum peak area response was obtained at 280 ˚C of desorption temperature and 4 min of desorption time. The results showed that increased sampling humidity and temperature interfered with the NTD performance and decreased the peak area responses of the analytes. The proposed NTD had a high sensitivity for the sampling and analysis of the desired compounds. Limit of Detection (LOD) and the Limit of Quantitation (LOQ) of the NTD for the analytes were in the range 0.01-0.03 and 0.02-0.05 ng.mL-1, respectively. Moreover, the repeatability of the proposed NTD was obtained to be in the range of 2.3-9.1%. Therefore, the NTD packed with UiO-66-NH2 adsorbent can be used as a suitable and robust method for the active sampling and analysis of occupational/environmental pollutants in the air.