Eosin B Research Articles

Highly efficient nitrogen-doped graphene coupled eosin-B photocatalyst for fixation and regeneration of N2 and NADH cofactors under visible light

Achieving nitrogen fixation in visible light-driven using metal-free and eco-friendly semiconductors at acceptable temperature and pressure still remains a big challenge. In the field of artificial photosynthesis, reported semiconductors for nitrogen fixation have large band gap around 3.0 eV and requires high temperature and pressure which results the catalytic nitrogen fixation is navigate under visible light, consume supply of global energy, and emit global greenhouse gas. In conflict this report illustrates a metal free catalyst EBCNDG with a band gap of ∼2.64 eV at room temperature and pressure indicate photocatalytic campaign toward nitrogen fixation in visible light without producing any harmful gases. The EBCNDG photocatalyst has a vacancy of high active oxygen which helps adsorb and stabilize the intermediate and increases the rate of nitrogen fixation. The EBCNDG photocatalyst was prepared by coupling of an eosin B (EB) with N-doped graphene (NDG) via amide linkage. This unique combination opens a new trial for nitrogen fixation as well as NADH regeneration under acceptable conditions using visible energy. The amount of ammonia obtained by EBCNDG is 0.513 mM and the regeneration yield of NADH is 90.3%.

Designing and synthesis of perovskite nanocrystals: a promising wide-spectrum solar light-responsive photocatalyst and lead ion sensor.

Perovskites are an emerging material with a variety of applications, ranging from their solar light conversion capability to their sensing efficiency. In current study, perovskite nanocrystals (PNCs) were designed using theoretical density functional theory (DFT) analysis. Moreover, the theoretically designed PNCs were fabricated and confirmed by various characterization techniques. The calculated optical bandgap from UV-Vis and fluorescence spectra were 2.15 and 2.05eV, respectively. The average crystallite size of PNCs calculated from Scherrer equation was 15.18nm, and point of zero charge (PZC) was obtained at pH 8. The maximum eosin B (EB) removal efficiency by PNCs was 99.56% at optimized conditions following first-order kinetics with 0.98 R2 value. The goodness of the response surface methodology (RSM) model was confirmed from analysis of variance (ANOVA), with the experimental F value (named after Ronald Fisher) of 194.66 being greater than the critical F value F0.05, 14, 14 = 2.48 and a lack of fit value of 0.0587. The Stern-Volmer equation with a larger Ksv value of for Pb2+ suggests its greater sensitivity for Pb2+ among the different metals tested.

Mechanical milling assisted synthesis of FePc-gCN nanocomposite photocatalyst: Dye degradation, mechanism and DFT insights

We present here a mechanochemical method for facile synthesis of Iron phthalocyanine (FePc)- graphitic carbon nitride (gCN) composite with varying weight ratio (1:1, 1:2.5, 1:5) of FePc and gCN. The photocatalytic efficiency of FePc-gCN composite for the elimination of various synthetic dyes, viz, Methylene Blue (MB), Congo Red (CR) and Eosin B (EB) in aqueous media were investigated under visible radiation. The sample with FePc:gCN weight ratio of 1:5 resulted in a removal efficiency of 90 % for MB and 75 % for EB, much higher than their individual counterparts. The synergistic interaction, less charge recombination, and smaller charge transfer resistance in FePc-gCN composite contributed to the superior catalytic performances as confirmed from the impedance spectroscopy and the photoluminescence spectroscopy. Moreover, first principle based DFT calculations on the O2 adsorbed FePc-gCN heterostructure predicted a net transfer of |0.11e| charges from Fe to O atom, favoring the generation of super oxide (O2•−) radicals which contributes actively towards degradation of dye pollutants.

Utilization of commercial anion exchange membrane DF-120 for adsorptive removal of eosin-B from wastewater

This study investigates the batch adsorption of eosin-B (EB) from wastewater onto the commercial anion exchange membrane (AEM) DF-120 at a temperature of 25 °C. The detailed influence of various operational factors on the percentage removal of EB is outlined. The EB removal percentage from wastewater demonstrates an increase with the mass of AEM DF-120 and contact duration. At the same time, the percentage removal of it decreases with the rise in temperature and concentration. Results from the adsorption kinetics studies reveals that EB adsorption conforms to pseudo second order (PSO) model, having a correlation coefficient (R2) value of 0.999. The adsorption isotherm analysis indicates that EB adsorption aligns with the Langmuir isotherm as the value of R2 approaches unity. Furthermore, the measured mean adsorption energy (E = 0.68 KJmol−1) suggests that this is a physical adsorption process. Thermodynamic assessments of adsorption reveal its exothermic nature, supported by the value of enthalpy (ΔH° = −56.09 KJ mol−1). Additionally, Gibb’s free energy (ΔG°) value signifies that the process is feasible. The regeneration of the commercial AEM DF-120B was also revealed.

TiO2 nanorods decorated Si nanowire hierarchical structures for UV light activated photocatalytic application

Water remediation techniques like photolysis have recently piqued the interest of many researchers due to water contamination resulting from heavy industrialization and urbanization. In the current work, as-synthesized TiO2 nanorod decorated vertically aligned silicon nanowire (SiNW) leads to a hierarchical morphological structure formation. The photocatalytic nature of the fabricated SiNW/TiO2 nanoheterojunction is examined by the dye degradation of textile pollutants like methylene blue (MB), rhodamine B (RhB), and eosin B (EB). The catalytic dye degradation investigations revealed that 4 h hydrothermal synthesis of TiO2 on the surface of SiNW (ST4) exhibited excellent catalytic behaviour. In the presence of H2O2 and UV irradiation, the ST4 nanoheterostructure can degrade 98.89% of the model pollutant methylene blue (MB) in 15 min, demonstrating remarkable photocatalytic performance. The direct Z-scheme heterojunction exhibited by the SiNW/TiO2 structure facilitates a more efficient charge transfer mechanism with higher reducing and oxidizing ability leading to enhanced photocatalytic behaviour. The degradation pathway examined by LC-MS studies demonstrated the complete breakdown of the organic MB dye molecules ultimately mineralizing into CO2, H2O, and other inorganic substances. The photocatalyst ST4 exhibited excellent reusability and stability after multiple cycles of dye degradation enabling its use in practical water purification purposes.

Synthesis and characterization of the magnetic chitosan/zinc oxide nanocomposite: an efficient magnetic adsorbent for removal of harmful aromatic micropollutants from wastewater

In this work, a magnetic chitosan/zinc oxide nanocomposite (CS/ZnO-Fe3O4) was fabricated for efficient adsorptive removal of harmful aromatic micropollutants, including Cephalexin (CFX) antibiotic and Eosin B (EB) dye from wastewater samples. To maximize the adsorption efficiency of the CS/ZnO-Fe3O4, the adsorption process was first modeled and statistically optimized by using the response surface methodology based on central composite design (RSM-CCD). The results demonstrated that the maximum removal efficiency of the adsorbent for CFX and EB was 98.87% and 99.08%, respectively. Also, the adsorption isotherms, kinetics, and thermodynamics were also studied in detail under the optimum conditions. The results indicated that the adsorption equilibrium data was fit well with the Langmuir isotherm model, which indicated monolayer adsorption via chemisorption process. The Langmuir maximum adsorption capacity (Qmax) was 81.38 mg g−1 and 144.4 mg g−1 for CFX and EB, respectively. The adsorption kinetic was followed by the pseudo-second-order kinetic model, and the thermodynamic studies showed that the adsorption process was endothermic and spontaneous, as well as that adsorption entropy was also increased during the process. Also, the main adsorption mechanism was considered to be based on H-bonding, n-π, and electrostatic interactions. The regeneration experiments indicated that the spent adsorbent was easily regenerated by NaOH solution (0.1 mol L−1) and reused for subsequent cycles without a significant decrease in its performance, so that removal efficiency remained about 90% at the fourth cycle. Overall, the results indicated that CS/ZnO-Fe3O4 could be used as a promising adsorbent for the efficient removal of aromatic micropollutants from wastewater.

Removal of a local antiseptic dye on two solid supports by adsorption

In this research, we studied the adsorption of an Eosin B (EB) dye is a local antiseptic, available in pharmacies in the form of an active preparation on the surface of activated carbon and natural clay. Activated carbon and natural clay were characterized using various physicochemical techniques to determine the crystalline structures of the two adsorbents by DRX, and the chemical bonds by FTIR analysis, and finally, to know the maximum absorbance λmax of the dye by UV-Visible analysis. The effects of various experimental parameters, such as the effect of adsorbent mass, the initial concentration of eosin B is 1.610-4 molL-1, the contact time is 24 hours, and the pH 7 ~ 9, were studied. The removal of the dye increases with the decrease of the initial concentration of Eosin B (EB) and the contact time of the solution. The percentage of Eosin B (EB) removal increases accordingly, which arrives at 80% for activated carbon and 92% for natural clay. Langmuir and Freundlich adsorption models were used for the adsorption equilibrium descriptions. The data was very well corrected with these models. Monolayer adsorption capacities were equal to 50 mgg-1 at pH 8.3 and 25°C. Adsorption measurements show that the adsorption process is very fast and physical in nature.

Adsorption of Eosin B from Wastewater onto the Prepared Porous Anion Exchange Membrane.

This research describes the fabrication of the porous trimethylamine (TMA)-grafted anion exchange membrane (AEM) over a phase inversion process. The synthesis of the generated AEM was verified using Fourier transform infrared (FTIR) spectroscopy. The fabricated porous AEM showed 240% water uptake (WR), 1.45 mg/g ion exchange capacity (IEC), and a 9.0% linear expansion ratio (LER) at 25 °C. It exhibited a porous structure and higher thermal stability. It was utilized to remove eosin B (EB) from wastewater via the process of adsorption. The adsorption capacity of EB increased with time and the starting concentration of EB while decreasing with temperature and the AEM dosage. Adsorption isotherm investigation results showed that EB adsorption onto the porous AEM followed the Langmuir isotherm because the value of correlation coefficient (R2 = 0.992) was close to unity. Because the correlation coefficient was close to one, it was determined through adsorption kinetic experiments that the adsorption of EB on the produced porous AEM was suitable for a pseudo-second-order model. Thermodynamic study about process of EB adsorption on the porous AEM revealed that there was an exothermic (ΔH° = -16.60 kJ/mol) and spontaneous process.

Photocatalytic fixation and oxygenation of NAD+/NADP+ and sulfides using solar light: Exploring mechanistic investigations and their impact on synthetic applications.

Sulfur-doped Eosin-B (SDE-B) photocatalysts were synthesized for the first time utilizing sublimed sulfur (S8) as a dopant in an insitu thermal copolymerization technique. Sulfur doping not only increased Eosin-B (E-B) absorption range for solar radiation but also improved fixation and oxygenation capabilities. The doped sulfur bridges the S-S bond by substituting for the edge bromine of the E-B bond. The improved photocatalytic activity of SDE-B in the fixation and oxygenation of NAD+/NADP+ and sulfides using solar light is attributed to the photo-induced hole of SDE-B's high fixation and oxygenation capacity, as well as an efficient suppression of electron and hole recombination. The powerful light-harvesting bridge system created using SDE-B as a photocatalyst works extremely well, resulting in high NADH/NADPH regeneration (79.58/76.36%) and good sulfoxide yields (98.9%) under solar light. This study focuses on the creation and implementation of a sulfur-doped photocatalyst for direct fine chemical regeneration and organic transformation.

A Computational and Experimental Analysis of Aldehyde Photooxidation Driven by Visible Light in a Homemade Reactor

AbstractA computational and experimental analysis of HAT mechanism to obtain carboxylic acid via photooxidation of aldehyde is described, using a homemade reactor. The considered photocatalysts are organic dyes such as 2-chloroanthraquinone (2-ClAQN), rhodamine 6G (Rh6G), fluorescein (Fl), and eosin B (EOB); and the light spectrum is that of the visible light.

A Study of the Removal of Pollutants Dyes from Aqueous Solution by Highly Active Low Cost Biosorbents

This research aims to remove the toxic and dangerous Eosin B (EB) dye by using one of the adsorption processes based on environmentally friendly surfaces prepared in a natural way without chemical activation as low-cost agricultural waste, like pomegranate peels, banana peels, clove sticks and eggshells. Several factors were used that affect the adsorption process. These materials have several advantages such as eco-friendly and having a high surface area to enhance the removal of pollutants. The studied parameter includes the contact time of an equilibrium EB dye which was achieved within 60 min, effect of different initial concentrations of EB dye (10-60 mg/L). The concentration of EB dye was found to increase with the adsorption efficiency (Qe mg/g) while the removal percentage E% decreased, whereas effect of adsorbents dosage was found to increase when the removal percentage (E%) of Eosin B dye increased from 45.55-88.99%, 40.67-82.23% (32.21-77.32%), and (25.34-75.22%). However, the adsorption capacity decreased from 95.66 to 43.43 mg/g, 92.34 to 40.11 mg/g, 90.32 to 37.11mg/g and 91.22-40.3 mg/g when the mass adsorbents of pomegranate peels, banana peels, clove sticks, and egg shells increased from 0.025 to 2 gm in the same order. Also, adsorption isotherms were studied and they obeyed the Freundlich isotherm models.

Ionic Liquid Cross-Linked High-Absorbent Polymer Hydrogels: Kinetics of Swelling and Dye Adsorption.

The use of polymer gels for the removal of toxic chemicals from wastewater is an important area in terms of both academic and industrial research. This work presents a simple approach to the fabrication of chemically cross-linked cationic hydrogel adsorbents using designed ionic liquid-based cross-linkers and their successful use in the removal of organic dyes. Two different ionic liquid cross-linkers, [VIm-4VBC][Cl] (ILA)/[DMAEMA-4VBC][Cl] (ILB), are synthesized by the simple nucleophilic substitution reaction of 4-vinylbenzyl chloride (4VBC) separately with 1-vinylimidazole (VIm) and 2-(dimethylamino)ethyl methacrylate (DMAEMA). Cross-linked poly(acrylamide) (CPAam) and poly(2-hydroxyethyl methacrylate) (CPHEMA) hydrogels are then prepared from the corresponding monomers and as-synthesized cross-linkers (ILA and ILB) by free radical polymerization in the presence of a redox initiator combining ammonium persulfate (APS) and N,N,N',N'-tetramethylethylenediamine (TEMED). The dried CPAam and CPHEMA xerogels exhibit macroporous morphology and high thermal stability. The hydrogel samples exhibit high swelling behavior, and the diffusion of water molecules into the hydrogels follows pseudo-Fickian kinetics. The cationic cross-linking sites in the hydrogel networks allow preferable binding with anionic dyes, and these dye uptake capacities are determined using different model anionic dyes via UV-vis spectroscopy. The dye adsorption onto these hydrogels follows a pseudo-second-order kinetic model. The adsorption mechanism is also analyzed by employing intraparticle diffusion and Boyd kinetic models. The relationship between the maximum equilibrium adsorption capacity (qm) of the hydrogels for eosin B (EB) dye and the equilibrium EB concentration can be better described by Langmuir and Freundlich isotherm models, and the estimated qm using the Langmuir isotherm can reach more than 100 mg g-1. The cross-linked hydrogels can be easily regenerated and have a recycling efficiency of >80% for up to three consecutive dye adsorption-desorption cycles, which is promising for their use in wastewater treatment.

Application of QPPO/PVA based commercial anion exchange membrane as an outstanding adsorbent for the removal of Eosin-B dye from wastewaters

Commercially available QPPO/PVA based anion exchange membrane (AEM) BIII was to inquire the percentage discharge of anionic dye Eosin-B (EB) at terrain temperature from wastewater. The impact of EB initial concentration, membrane dosage, ionic strength, contact time and temperature on EB percentage removal was contemplated. The EB percentage removal was increased from 22 to 99.56% and 38.15–99.56% with contact time and membrane dosage respectively while decreased from 99.56 to 29%, 99.56 to 54.61% and 99.56 to 92.22% with enhancing initial concentration of EB, ionic strength and temperature respectively. Nonlinear isotherm models were utilized to demonstrate EB adsorption onto AEM BIII. Attained results exhibited that nonliner Freundlich isotherm model best fitted to EB adsorption onto AEM BIII. For EB adsorption onto AEM BIII, adsorption kinetics were inquired in detail by using several kinetic models but EB adsorption nicely fitted to pseudo-second-order kinetics. Similarly thermodynamic analysis was performed and results pointed to an exothermic adsorption of EB onto AEM BIII. The membrane could be reused for four concecutive cycles with loosing its efficiency.

Delicate Design of ZnS@In2S3 Core-Shell Structures with Modulated Photocatalytic Performance under Simulated Sunlight Irradiation.

ZnS@In2S3 core-shell structures with high photocatalytic activity have been delicately designed and synthesized. The unique structure and synergistic effects of the composites have an important influence on the improvement of photocatalytic activity. The photocatalytic activity has been studied by photodegrading individual eosin B (EB) and the mixture solution consisting of eosin B and rhodamine B (EB-RhB) in the presence of hydrogen peroxide (H2O2) under simulated sunlight irradiation. The results show that all of the photocatalysts with different contents of In2S3 exhibit enhanced catalytic activity compared to pure ZnS for the degradation of EB and EB-RhB solution. When the theoretical molar ratio of ZnS to In2S3 was 1:0.5, the composite presents the highest photocatalytic efficiency, which could eliminate more than 98% of EB and 94% of EB-RhB. At the same time, after five cycles of photocatalytic tests, the photocatalytic efficiency could be about 96% for the degradation of the EB solution, and relatively high photocatalytic activity could also be obtained for the degradation of the EB-RhB mixed solution. This work has proposed a facile synthetic process to realize the controlled preparation of core-shell ZnS@In2S3 composites with effectively modulated structures and compositions, and the composites have also proved to be high-efficiency photocatalysts for the disposal of complicated pollutants.

Synthesis of hydrogels for adsorption of anionic and cationic dyes in water: ionic liquid as a crosslinking agent

In this work, we synthesized an ionic liquid (IL)—(Dimethylamino)ethyl Methacrylate maleate ([DMAEMA]MA) as the crosslinker, through one-pot to synthesized hydrogels with high adsorption capacity for dye in water. Both anionic dyes (methylene blue, rhodamine B) and cationic dyes (congo red, eosin B) could be adsorbed by this type of hydrogel with different adsorption mechanism, and its adsorption capacity for methylene blue (MB), rhodamine B (RHB), congo red (CR), eosin B (EB) were 489.1, 463.2, 465.5 and 462 mg/g (amount of dye adsorbed per gram of hydrogel), respectively. The surface structure of the hydrogel before and after adsorption was observed and compared by scanning electron microscope (SEM). After studying the adsorption isotherms of the hydrogel adsorbent, it was found that the hydrogel adsorbent had two adsorption mechanisms. This was not found in reported literatures previously.

UV-light-driven cadmium sulphide (CdS) nanocatalysts: synthesis, characterization, therapeutic and environmental applications; kinetics and thermodynamic study of photocatalytic degradation of Eosin B and Methyl Green dyes.

Cadmium sulphide (CdS) nanoparticles (NPs) were synthesized through hydrothermal route and characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), Energy dispersive X-ray analysis, Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy and Thermo gravimetric analysis (TGA).The band gap of CdS nanoparticles was found to be 2.38 eV. CdS NPs are crystalline aggregates with hexagonal structure as shown by SEM and XRD analysis. TGA study revealed that the synthesized nanomaterials were very stable to temperature and only 6.54% total loss occurred during heating range (25 °C-600 °C).The CdS NPs were used for the first time against the degradation of Eosin B (EB) and Methyl green (MG) dyes in aqueous solution.The degradation of EB and MG over CdS nanocatalysts followed second order kinetics. The predicted activation energies for both the dyes' reactions were 61.1 kJ/mol and 32.11 kJ/mol, respectively. About 95% and 90% dye degradation was observed at the time interval of 160 minutes for EB and MG, respectively. High percent degradation of EB was observed at high pH (pH 0) while at low pH (pH 4) high percent degradation was found for MG dye. Maximum dye degradation was found at the optimal dose (0.03 g/L) of the catalyst and at low dye concentration. The rate of EB and MG dye degradation was found to increase with increase in temperature up to 45 °C. The recyclability study showed that CdS nanoparticles could be reused for the degradation of the given dyes. Good antibacterial activity against Staphylococcus aureus was shown by CdS NPs. From the biocompatibility it was confirmed that CdS NPS are bioincompatible compatible.

Designing, modelling, and optimising amido black and Eosin B dyes adsorption on MWCNT/ZrO2/Pb nanocomposites from aqueous solution by response surface methodology

ABSTRACT This research illustrates the modification of multi-walled carbon nanotube (MWCNT) by ZrO2/Pb to construct a nanocomposite (MWCNT/ZrO2/Pb-NC) using a simple precipitation technique, as well as to examine the ability of this NC for the adsorption of two dyes, amido black (AB) and Eosin B (EB), in binary systems. FESEM, XRD, FTIR, and EDX were utilised to investigate the MWCNT/ZrO2/Pb-NC. The results suggested that MWCNT/ZrO2/Pb-NCs possessed as-synthesised crystalline nature with a cubic morphology and the average particle size of 30–50 nm. The nano-adsorbent represented herein showed high adsorption efficiency towards AB and EB. The influence of experimental parameters, i.e. pH, initial concentration of dyes, contact time, and MWCNT/ZrO2/Pb-NCs mass, were analysed by central composite design (CCD). The removal percentages more than 95% for AB and EB dyes were obtained by the adjustment of operational conditions at pH 6.0, 0.05 g of MWCNT/ZrO2/Pb-NCs, 15 min stirring, and 15 mg L−1 of each dye. The binding behaviour of the two dyes on the proposed NC was precisely modelled by the Langmuir isotherm. The adsorption capacities for AB and EB were 15.46 and 16.92 mg g−1, respectively. Pseudo-first order model, owing to its high correlation coefficient and closeness of experimental and theoretical data, well represented the behaviour of the corresponding adsorption system. Mechanism examination strongly affirmed the high contribution of external mass transference as the main rate-controlling step. The successful regeneration of MWCNT/ZrO2/Pb-NC signified the usefulness of the NC in wastewater treatment and its capability of environmental management.

Utilization of charge-transfer complexation to generate carbon-based nanomaterial for the adsorption of pollutants from contaminated water: Reaction between urea and vacant orbital acceptors

In this study, the charge-transfer complexation between urea as a donor and vacant orbital acceptors (i.e., FeCl3 and NiCl2) was used to generate a NiFe2O4 composite. The resultant composite was used to increase the adsorption capacity of free fullerene carbon nanotubes (CNT) for two organic dyes as example models [toluidine blue (TB) and eosin B (EB)] by combining this CNT with the resultant composite. Fullerenes are a type of carbon nanomaterials which particularly well suited for environmental remediation applications due to their large surface area combined with unique physicochemical properties that render them easily biodegradable and nontoxic. They have great potential for the recovery and removal of dyestuff from water. Crushing the NiFe2O4 composite with fullerene CNTs at a 1:10 M ratio (composite to CNT) in the presence of a few drops of methanol yielded a solid, black, homogenous NiFe2O4-CNT adsorbent material. This environmentally friendly approach enhanced the adsorption efficiency of free fullerene CNT for TB dye by 33% and for EB dye by 25%.

Sub-ppm-level organic dyes catalyzed reversible deactivation radical polymerization (RDRP) via in situ bromine-iodine exchange under LED light irradiation

A facial white light-emitting diode (LED) induced reversible deactivation radical polymerization (RDRP) of methacrylate monomers was successfully conducted by using sub-ppm-level organic dyes as organocatalysts. The organic dyes contained Eosin B (EB), Rose bengal (RB), Eosin Y (EY) and 3,3,5,5-Tetraiodophenolsulfonphthalein (TIPS) with the merits of metal free, non-toxic and inexpensive. The resulted poly (methacrylate) with controlled molecular weights and polydispersity indices were obtained either under white LED irradiation or green and blue LED. The polymerization of various functional methacrylates demonstrated that this polymerization system with dyes as organocatalysts had high monomer versatility. Chain extensions copolymerization verified the living features of reversible deactivation radical polymerization.

Cathodic electrochemiluminescence behavior of Eosin B and its quenching mechanism by Cr3+

A novel electrochemiluminescence (ECL) system consisting of Eosin B (EB) and K2S2O8 was studied and found to generate ECL following the oxidation or reduction of Eosin B and K2S2O8. The type of buffer solution, type of co-reactant, pH value, and K2S2O8 concentration were optimized through experiments to make the reaction system reach the best value. In addition, we found that Cr3+ has a great quenching effect on the EB reaction system. Through the comparison of ECL and CV under different conditions, DPV curve, UV spectrum and ECL spectrum experiments, we focused on the quenching mechanism of Cr3+ on the system and made reasonable guesses. This method demonstrates the potential application value of ECL in the field of environmental monitoring and reveals the potential value of organic molecular ECL luminophores.