Thiophene Concentration Research Articles

Photocatalytic Desulfurization of Thiophene with Chevrel Phase Ni2Mo6S8 Synthesized by SHS.

The Chevrel phase compounds Cu4Mo6S8, Ni2Mo6S8, and Fe2Mo6S8, synthesized by self-propagating high temperature synthesis, were evaluated as photocatalysts for visible light photocatalytic desulfurization. Investigations began with reflectance measurements from which absorbance spectra were calculated using the Kubelka-Munk transformation. The absorbance data was then used to create Tauc plots to find the direct and indirect bandgaps of the Chevrel phase compounds. Bandgaps were found to be no more than the 1.74 eV for Ni2Mo6S8, so it was selected for further study because this bandgap suggests it will use the sun's emission spectrum better than the other materials studied here. Photocatalytic desulfurization experiments studied the concentration of thiophene mixed into n-octane with and without exposure to Ni2Mo6S8 with and without light exposure because of the relative difficulty of removing thiophenes from liquid fossil fuels by the industry standard hydrodesulfurization process. Ultraviolet-visible spectroscopy was used to analyze chemical changes in the thiophene-octane solution. Spectroscopic results demonstrate that the thiophene was effectively removed by exposure to Ni2Mo6S8 and visible light together but not by exposure to Ni2Mo6S8 or visible light alone. Multiple tests with the same Ni2Mo6S8 sample demonstrate that the material is reusable as a catalyst for photocatalytic desulfurization. The proposed mechanism results in the release of SO x species, which may be controlled and captured if separated from fossil fuels in bulk during industrial processing in contrast to their uncontrolled release as vehicle fuel exhaust. Controlled generation and collection of these species can allow for further processing into elemental sulfur in the same way that H2S released by standard hydrodesulfurization is processed into elemental S.

Thiophene desulfurization: Effects of dendritic silica and PEG as surface modifier on ZnO photocatalyst

This work focused on desulfurizing thiophene using a photocatalyst comprising zinc oxide (ZnO) and fibrous silica nanospheres (KCC-1) to exploit the photocatalytic process. Six photocatalyst samples (commercial ZnO, KCC-1, ZnO/1.5KCC-1, ZnO/2.0KCC-1, ZnO/2.5KCC-1 and ZnO/PEG) were characterized using field-emission scanning electron microscopy (FESEM), Fourier transform infrared (FTIR) spectroscopy and X-ray diffractometry (XRD). It was found that the properties of ZnO were altered by incorporating KCC-1 to enhance the efficiency of thiophene desulfurization. Desulfurization performances were investigated using three parameters, which were initial pH, initial thiophene concentration, and photocatalyst loading. Each parameter was validated using thiophene desulfurization percentage and turbidity removal percentage. This work discovered that ZnO/2.0KCC-1 was the optimum photocatalyst with 83 % thiophene desulfurization. No clear trend was observed for turbidity removal percentage, yet the ZnO/KCC-1 photocatalyst was able to reduce turbidity significantly. The pH of the permeation rose from neutral to alkaline range due to the hydroxyl radicals (•OH) produced during the desulfurization process.

Quantitative analysis of organosulphur compounds in crude oil samples using magnetic solid phase extraction based on Au-Fe3O4 adsorbent and gas chromatography with time-of-flight mass spectrometry

This study focused on the development of a magnetic solid phase extraction (m-SPE) method using Au-Fe3O4 as an adsorbent followed by GC-ToFMS analysis for the determination of organosulphur compounds (OSCs) in fuel samples. The m-SPE using Au-Fe3O4 NPs was preferred because of the low toxicity of the adsorbent1, high separation efficiency using external magnet2 and greater extraction selectivity between sulphur and Au atom3. The Au-Fe3O4 NPs were characterized using XRD, UV–Vis, TEM, SEM and FTIR. This method was optimized using multivariate analysis based on a two-level full factorial and central composite designs. The conditions which produced optimum efficiency were found to be 150 mg mass of sorbent, 100 µL eluent volume, 50 min extraction time and 6,5 pH of the sample. These optimum conditions showed a relatively low limit of detection in the range of 0.02–0.199nµg/g and limit of quantification of 0.08–0.602 µg/g. Furthermore, a relative standard deviation of triplicates analysis was between 0.8 and 2.3% with good linearity of 0.9816–0.9961. The percentage recovery for thiophene, 3-methylthiophene, benzothiophene and dibenzothiophene ranged from 76 to 95% for the spiked samples. The optimized m-SPE method was then applied in real fuel oil samples. The concentration of thiophene, 3-methylthiophene, benzothiophene and dibenzothiophene in crude oil, gasoline, diesel and kerosene ranged from 0.43–1.94 µg/g, 0.78–1.63 µg/g, 0.95–4.31 µg/g to 1.55–2.09 µg/g, respectively. The m-SPE, followed by GC-ToFMS method, proved to be efficient, inexpensive and an alternative method for OSCs analysis in fuel oils.

Metal-Organic frameworks with two different metal centers for thiophene adsorption: Synthesis, characterization and mechanism analysis

Thiophene, widely found in fossil fuels, not only corrodes equipment but also causes great harm to the environment after combustion. Adsorptive desulfurization can deeply desulfurize fuels with low sulfur content and shows great development prospect. We experimentally studied the adsorption of thiophene and benzene in Cu-BTC and two types of IZE metal-organic frameworks (MOFs). By changing the temperature and concentration conditions, we compared the separation performance of MOFs with different metal centers. We found IZE-1 to have excellent s high thiophene adsorption capacity selectivity for thiophene adsorption at low thiophene concentration and (-up to 9.3 mg S/g MOF at 70 °C), superior to that of Cu-BTC. We performed first-principles calculations and elucidated the mechanism of thiophene adsorption by analyzing the electronic structure of MOFs. The molecular dynamics simulation further explains the high selectivity of thiophene adsorption and the adsorption process. This study demonstrates the potential for MOFs to be used in thiophene adsorption, particularly at high thiophene concentrations.

Non-target and target analysis to identify and characterize thiophenes in soil from an abandoned coking plant

There is concern about the large amounts of aromatic compounds emitted during coking. Previous studies of coking emissions have been focused on polycyclic aromatic hydrocarbons, dioxin-like compounds, phenols, and volatile organic compounds, but previously unidentified compounds produced during coking may also harm human health. Here, the main pollutants in 69 soil samples from an abandoned coking plant were identified by non-target screening using two-dimensional gas chromatography time-of-flight mass spectrometry. Polycyclic aromatic hydrocarbons, long-chain alkanes, and thiophenes were dominant. High concentrations of thiophenes (benzothiophenes, dibenzothiophenes, and benzonaphtholthiophenes) were found. Quantitative analysis of 12 thiophenes (selected because of their concentrations and detection frequencies) was performed, and the concentrations were 0.03–647 μg/g dry weight, which were extremely high compared with concentrations in soil from uncontaminated sites and other industrial sites. Dibenzothiophene and benzo[b]naphtho[2,1-d]thiophene were dominant, accounting for 69% of the total thiophene concentration. Thiophene profiles in very contaminated areas were different from the profile in coal but similar to the profile in tar. Thiophenes in soil at the coking plant may have been supplied in tar leaks, wastewater, coke oven gases, and exhaust gases. A toxicity assessment indicated a strong likelihood of oxidative stress being induced by exposure to multiple thiophenes at the coking plant. The results suggest that thiophene emissions from coking plants should attract more attention than currently.

Adsorptive desulfurization of thiophene using Cu-CNF slurry in a coiled flow inverter with recycling

This study presents an alternative to adsorptive desulphurization (ADS) process in packed beds by making use of enhanced radial mixing prevalent in coiled flow inverter (CFI). We describe the synthesis of Cu-tartrate as the precursor for Cu-carbon nanofiber (Cu-CNF) and the application thereof in ADS of liquid fuels in a CFI. Thiophene was removed from n-hexane using a slurry of Cu-CNF in the liquid. The data show the sulfur (S) - loading of 103 mg/g in Cu-CNF at 2000 ppmw-S concentration of thiophene in the liquid at 120 cc/min flowrate using five CFI units connected in series. Recycling was introduced for the first time in CFI, and three CFI units connected in series with the recycle ratio of 2 were sufficient to achieve the same removal efficiency as with five CFI without recycling. The results indicate that CFI is an efficient technology and has potential to replace packed bed adsorbers.

Development of a fluorescent probe based on a tricyano structure for the detection of PhSH in environmental and biological samples

In this study, a NIR fluorescent probe based on ICT principles was developed for the detection of phenylthiophenol. An excellent fluorescent mother nucleus is constructed with tricyano groups, and benzenesulfonate was introduced as a specific recognition site for thiophene, which can be used for rapid detection of thiophenol. The probe has a significant Stokes shift (220 nm). Meanwhile, it had rapid response to thiophene and high specificity. The fluorescence intensity of the probe at 700 nm showed a good linear relationship with thiophene concentration in the range of 0 to 100 μM, and the detection limit was as low as 45 nM. The probe had also been successfully applied to the detection of thiophene in real water samples. MTT assay showed low cytotoxicity and excellent fluorescence imaging in live cells.

Study of a High-Voltage NMC Interphase in the Presence of a Thiophene Additive Realized by Operando SHINERS

Improving the electrochemical properties and cycle life of high-voltage cathodes in lithium-ion batteries requires a deep understanding of the structural properties and failure mechanisms at the cathode electrolyte interphase (CEI). We present a study implementing an advanced Raman spectroscopy technique to specifically address the compositional features of interphase during cell operation. Our operando technique, shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS), provides a reliable platform to investigate the dynamics of the interphase structure and elucidate the compositional changes near the cathode surface. To improve the CEI properties, thiophene was introduced and investigated as an effective, high-voltage film-forming additive by largely diminishing the capacity fading triggered at high potentials in LiNi1/3Co1/3Mn1/3O2 cathodes. While the cells without thiophene show severe capacity fading, cells with an optimized concentration of thiophene exhibit a significant performance improvement. Operando SHINERS detects the presence of a stable CEI. The results suggest that the composition of the CEI is dominated by polythiophene and copolymerization products of ethylene carbonate with thiophene, which protects the electrolyte components from further decomposition. The formation mechanism of the polymeric film was modeled using quantum chemistry calculations, which shows good agreement with the experimental data.

Modelling of Aromatic Sulfur Compounds Adsorption from Hydrocarbon Fuels by Biochar Based Adsorbent

In this work model fuel containing thiophene, benzothiophene and dibenzothiophene in different concentration combinations were treated with biochar. The quantity of total sulfur into the stock mixed solutions was below 1000 ppm. The adsorbent was prepared by pyrolysis of rice husks. The investigation aimed to use the method of multiple linear regression to derive a mathematical model, describing the adsorption of the three aromatic sulfur compounds from single and multi-component solutions of model fuel. The model describing the adsorption from multi-component solutions, based on the experimental results, has a correlation coefficient of 0.961. It reveals that the degree of desulfurization does not depend on the concentration of thiophene, but only on the concentrations of benzothiophene and dibenzothiophene in the fuel. The model can be used to predict the level of the adsorptive purification of the fuel if the content of benzothiophene and dibenzothiophene in it is known.

Experimental study of thiophene and ferrocene in synthesis of single-walled carbon nanotubes in rich premixed hydrogen/air flames

The effects of varying concentrations of ferrocene and thiophene on the synthesis of carbon nanotubes (CNT) in a floating catalyst, flame-based reaction system were investigated. Pre-vapourised ethanol and a surrounding premixed H2/air flame were used as carbon feedstock and heat source. Samples of the synthesised material were collected and analysed using Raman spectroscopy, scanning electron microscopy, transmission electron microscopy and X-ray diffraction to determine their compostitions and properties. Sulphur to iron mass ratios mS/Fe were varied from 0 up to 10.1, by changing the relative amounts of thiophene and ferrocene. The latter was found to marginally improve the yield of CNTs, but rather led to an enhanced yield of iron oxide nanoparticles. In comparison, the addition of sulphur resulted in an improved production of CNTs in terms of number density and lengths. An optimum window of mass ratios mS/Fe for CNT production was identified as 0.1–2. A numerical model for the diffusion of species coupled with an equilibrium chemical model for the resulting species has been constructed to understand the mechanisms of the synthesis process, which demonstrates the range of elemental proportion conditions and residence times favourable to high yield of CNTs.

Application of poly(ether imide) membranes for the removal of the aromatic sulphur compounds from gasoline

Organic sulphur compounds are regularly present in the crude oil and natural gasoline, mostly as mercaptanes and heterocyclic sulphur compounds. Their combustion products have negative effects to both to the performance of the devices using gasoline and to the environment. Therefore, removal of the sulphur compounds in the pre-combustion process is of a great importance. One of the most promising method is application of the polymeric membranes. Suitable membrane should provide high permeability of sulphur compounds and low permeability of other hydrocarbons. In this work, several membranes based on the poly(ether imide) were tested for the sulphur organic compounds removal from the n-heptane. The membrane separation properties were measured for various concentrations of thiophene in heptane. It was found that increase of the amount of thiophene increases the flux of both thiophene and n-heptane. As the increase of the flux of the n-heptane was higher that the increase of the flux of the thiophene, the selectivity of the polyimide based membrane decreases with the increased concentration of thiophene in the feed. The possible reason is increased mobility of the polymer chains in the active layer.

Combined extractive and oxidative desulfurization approach based on ultrasound and ultraviolet irradiation with additives for obtaining clean fuel

Abstract The combined extractive and oxidative desulfurization approach based on ultrasound (US) and ultraviolet (UV) irradiations with additives was investigated for treatment of simulated fuel comprising of thiophene as model sulfur component and toluene as representative fuel with an objective of obtaining a clean fuel. Experiments were performed at constant conditions of ultraviolet light and/or ultrasound with varied operating parameters as initial thiophene concentration (over the range 100–800 ppm), temperature (40 °C–80 °C), catalyst loading (0.25 to 1.5 g/L), and oxidant loading (5 mL/L to 15 mL/L) followed by the step of extraction under fixed conditions to establish the effect on desulfurization. Complete thiophene removal was achieved at best operating conditions of 1 g/L as catalyst loading, 12.5 mL/L as oxidant loading, 60 °C as temperature and 200 ppm as the initial concentration of thiophene within 50 min of treatment. The extent of desulfurization was significantly higher for the combination approach than achieved for individual approach of ultrasound and UV irradiation. The activation energy was found to be 25.86 kJ/mol. The gasoline desulfurization followed pseudo first order kinetics whereas the thermodynamic analysis demonstrated same spontaneity at varied temperature. The values of Delta G and Delta H were found to be 92.88 kJ/mol and 23.09 kJ/mol, respectively. The cavitational yield was significantly higher (8.82 × 10−8 mg/J) for the combination approach. Overall, it was clearly demonstrated that the combined US/UV approach coupled with use of oxidants and catalyst at optimum conditions was the best treatment approach leading to effective removal of thiophene from the model fuel considered in the work.

Catalytic Conversion of Synthetic Sulfur-Pollutants in Petroleum Fractions Under Different Photocatalyst Loadings and Initial Concentration

In the oil and gas industry which applied to petroleum sources, thiophene is one of the sulphur contaminants that may harm the environment. The contents of sulphur in petroleum product gives out concern regarding the negative and harmful effect of sulphur contaminants onto environment and living health. One of the promising methods to degrade thiophene is photocatalytic degradation process. The usage of ZnO nanoparticles in photocatalytic degradation process has been wider due to its broad band gap, greater excitation of energy binding, and high stability. Several studies have discovered the ability of ZnO with capping agent in photocatalytic activity. Photocatalytic activity of photo-catalyst was affected by particle size, shape and morphology that are depending on the preparation method. Hence, this study put on priori-ties on synthesizing ZnO nanoparticles using precipitation method with the addition of KCC-1 which act as capping agent and used in the degradation of synthetic thiophene solution. The characterization of ZnO-KCC-1 using FTIR has confirmed that the successfulness produc-tion of ZnO-KCC-1 via precipitation method. There are three different loading of ZnO-KCC-1 (0.05 g/L, 0.10 g/L and 0.15 g/L) and thio-phene concentration (100 ppm, 300 ppm and 600 ppm) had been carried out in photocatalytic degradation of thiophene. The pH value for all fixed condition remains constant at natural pH range which is pH 7. The optimum condition of degrading synthetic thiophene under natural pH range by using ZnO-KCC-1 is at its loading of 0.05 g/L with the initial concentration of synthetic thiophene of 300ppm.The kinetic study of this research has been confirmed to be at the first-order of kinetic reaction.

A kinetic study of HKUST-1 for desulfurization applications

In this study, HKUST-1 prepared under solvothermal conditions and tested in desulphurization of model gasoline. The prepared HKUST-1 samples were characterized using surface area and pore volume analysis (BET), powder X-ray diffraction (XRD), and Fourier transforms infrared spectroscopy (FTIR). The prepared HKUST-1 was used for desulphurization of model gasoline (thiophene with iso-octane), and the influence of the thiophene concentration, HKUST-1 dose, temperature, and contact time. The experimental results revealed that the sulfur content in model fuel was reduced from 1500-148.2 ppm (90.12% removal efficiency) for four hours contact time at 30 ?C. In addition, an isotherm adsorption and kinetics study were performed for a batch process to understand the system equilibrium (i. e., the best fitting Langmuir isotherm or Freundlich isotherm). The kinetics study proved that the contained sulfur removal was best fitted by pseudo-second-order kinetics. Regeneration results show that the HKUST-1 has a reversible nature as an adsorbent. Therefore, HKUST-1 might be used as a promising adsorbent for removing thiophene compounds from gasoline.

Forecasting continuous carbon nanotube production in the floating catalyst environment

We present validated statistical models and univariate correlations of carbon nanotube (CNT) textile properties (specific electrical conductivity, Raman G:D ratio and mass yield rate) extracted continuously from floating catalyst chemical vapour deposition (FC-CVD) reactors over a uniquely wide multivariate experimental space. This includes directly controlled reactor settings (e.g. precursor concentrations, gas flow rates, furnace temperatures and winding speeds), indirect parameters (e.g. ambient temperature and pressure), and time-dependent reactor influences such as reactor tube age. Two vertical FC-CVD reactors, with different precursor delivery architectures, were considered: 1) in which precursors were pre-mixed together as a liquid solution that was directly injected into reactor; 2) in which vaporised precursors were independently injected in the gas phase using Coriolis-based microfluidic mass flow controllers with concentrations monitored in-line using FTIR spectroscopy. Factors favouring highest electrical conductivity fibres include: lower hydrogen flows, lean fuel-to-gas mixtures, higher winding rates, higher argon flows, with many thiophene concentration interactions with other parameters; for highest Raman G:D ratios: leaner fuel-to-gas mixtures, lower thiophene concentrations, higher hydrogen flows, and greater external laboratory pressure; but for yield rate, systematic trends were harder to discern. This study demonstrates the degree of predictability in FC-CVD reactors, quantitatively ranks impact of FC-CVD parameters, and identifies regions of fibre “spinnability” which correspond well with a recent meta-analysis of experimental results in the literature.

Sensor for the evaluation of dielectric properties of sulfur-containing heteroatomic hydrocarbon compounds in petroleum based liquids at a microfluidic scale

Desulfurization of hydrocarbons is an important step in the processing of petroleum products, which requires an accurate and robust method for the sulfur-containing component evaluation. On the other hand, sulfur-containing heteroatomic hydrocarbon additives are harmful for people and the environment. Therefore, it is advantageous to conduct laboratory tests at low volumes to reduce doses of exposure of sulfur-containing vapors to the personnel. Microfluidics is an emerging platform that provides an advantage to operate with low volumes. The microfluidic dielectric spectroscopy approach is proposed in the current contribution as a platform for determination of the concentration of polar heteroatomic components in binary mixtures. The presence of heteroatomic components in petroleum products leads to a perceptible change in the dielectric properties of the blend. This paper shows the technological aspects for the microfluidic sensor chip design. It was successfully used to determine the concentration of thiophene (as a typical sulfur-containing hydrocarbon) in gasoline. We compare the commercially available solution with the developed microfluidic sensor. We demonstrate the developed microfluidic sensor chip that has a comparable sensitivity as a macroscopic commercial measurement cell but at the microscale. It is able to operate at 103 times reduced volume of liquid analyte, providing stable control of the sulfur-containing additive concentration. The obtained results are intended to be applied for lab monitoring of sulfur-containing components in petroleum products.

Electrochemical monitoring of a photocatalytic desulfurization process of a model liquid fuel

Thiophene is a sulfur compound found mostly in gasoline and contributor to air pollution. This paper analyzes UV light photocatalytic desulfurization of model oil using Ag/TiO2. Thiophene concentration in the oil phase was determined by the electrochemical analyzer using Differential Pulse Voltammetry (DPV).
 The electrochemical experimental works were performed by two methodologies. First, aliquots of the oleic mixture were taken every 30 minutes and the thiophene concentration was measured over 7 hours of degradation. The concentration of thiophene decreased by 37.94%. In the second methodology, the in situ thiophene concentration was determined by DPV, where the reaction mixture was altered by the addition of acetonitrile and a quaternary ammonium salt as solvent-supporting electrolyte system. In this medium, the thiophene concentration was reduced by 43.88% after 4 hours of photocatalytic degradation.

Pervaporative desulfurization of n-heptane/thiophene model gasoline for modified polyether-block-amide (Pebax) membrane

Polyether-block-amide (Pebax) is a novel membrane material for pervaporative (PV) desulfurization of gasoline. In order to improve its desulfurization performance, Pebax was doubly modified by blending of perfluorosulfonic acid (PFSA) and hybridization of Si sol in this study, and Pebax-PFSA-Si hybrid membrane was fabricated. The hybrid membrane was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Polyacrylonitrile (PAN) ultrafiltration (UF) membrane as support, Pebax-PFSA-Si/PAN composite membrane was fabricated using coating method for PV desulfurization of n-heptane/thiophene mixtures. The incorporation of Si sol increased the cross-linking degree of Pebax-PFSA membrane, effectively inhibiting the excessive swelling of membrane. The dynamic absorption behavior of Pebax-PFSA-Si hybrid membrane was investigated. The degree of swelling (DS) of membrane increased with an increase of thiophene concentration in the feed. Effects of membrane compositions and operational variables such as feed temperature, feed sulfur concentration on desulfurization performance of Pebax-PFSA-Si/PAN composite membrane were investigated. Compared with Pebax membrane, Pebax-PFSA-Si/PAN membrane had the higher permeation flux because of the blending of PFSA and the higher enrichment factor due to the hybridization by Si sol.

Influence of modifications on the deep desulfurization behavior of NaY and Na13X zeolites in gasoline.

NaY and Na13X zeolites were modified by different modification manners including H+ modification, metal ion modification (Cu2+, Ni2+, or Ce3+), and H+ modification followed by metal ion modification to investigate their deep desulfurization behavior in gasoline. The sorbents were characterized by X-ray diffraction, FTIR of chemisorbed pyridine, N2 adsorption, and scanning electron microscope (SEM). The desulfurization performance of these sorbents was evaluated in model gasoline containing thiophene and cyclohexane with thiophene concentration of 500mg/L, and the results were analyzed to investigate the effect of preparation methods on adsorption desulfurization behavior. The result indicates that H+ modification or metal ion modification could all improve the desulfurization performance of both NaY and Na13X zeolites, except for Na13X modified by Cu2+ and Ni2+. For Cu2+ or Ni2+ ion exchanging, the crystal structure of Na13X would be destroyed, resulting in a much lower desulfurization efficiency than that of the parent Na13X. The desulfurization efficiency of sorbents prepared via H+ modification followed by metal ion modification is higher than that of sorbents prepared by single H+ modification or single metal ion modification, because the former is more conducive to improve the content of metal elements on the sorbents than the latter. In addition, the increase of the specific surface area and pore volume of the sorbents would directly lead to the improvement of desulfurization performance of the sorbents. Compared with Na13X, the H+ modification on NaY zeolite can significantly enhance the desulfurization performance of the sorbents. Among those prepared sorbents, the CuHY has the highest desulfurization efficiency. The influence of thiophene concentration (100-1000mg/L) on desulfurization efficiency of CuHY sorbent was evaluated. The results indicate that the desulfurization efficiency of CuHY sorbent is nearly 100% at room temperature, when the thiophene concentration is lower than 300mg/L. Moreover, its desulfurization behavior could be described by Langmuir isothermal equation. Graphic abstract .

Exceptional electromagnetic interference shielding and microwave absorption properties of room temperature synthesized polythiophene thin films with double negative characteristics (DNG) in the Ku-band region

Negative refractive index (NRI) metamaterials with simultaneously negative permittivity and negative permeability have recently experienced tremendous fundamental and practical interest due to their unique electromagnetic properties. In this work, polythiophene (PTh) thin films were synthesized using an in situ chemical oxidative polymerization route. The double negative characteristics (negative permittivity and permeability) appeared simultaneously in the as-prepared PTh thin films. The structural and microstructural characterizations of as-deposited PTh thin films were examined through different techniques including XRD, FESEM, TEM, XPS and FT-IR spectroscopy. Furthermore, microwave absorption properties such as reflection loss (RL), shielding effectiveness (SE) of the PTh thin films with varying monomer concentration were also investigated. The morphological investigation shows that the unique porous microstructure of the PTh fibers has a dramatic impact in the enhancement kinetics of the microwave absorption performance. The PTh fibers deposited at 0.2 M concentration of thiophene showed minimum reflection loss (RL) of −44.24 dB (99.9% microwave absorption) at 17.59 GHz frequency, with a total shielding effectiveness of −18 dB at 16.3 GHz with only 5.31 microns of matching thickness. The PTh thin films exhibit exceptional microwave absorption ability at a fairly thin thickness and show a greater effective absorption bandwidth (RL < −10 dB) in the Ku-band region; these findings definitely pave the way to explore the study of different conducting polymer materials for utilization in EMI-shielding applications.