OH Functional Groups Research Articles

Super hydrophilic-electrons acceptor regulated rutile TiO2 nanorods for promoting photocatalytic H2 evolution

Photocatalytic H2 evolution from water splitting in liquid–solid two-phase requires an efficient photocatalyst with excellent ability of charge separation and reactant molecular diffusion.In this study, the super hydrophilic-electrons acceptor with abundant –C=O and –OH functional groups were evenly grafted onto rutile TiO2 nanorods surface to speed up the charge separation and water molecular diffusion, respectively. The photocatalytic results showed that the TiO2-CA grafted by citric acid (with three –C=O, three carboxy-(–OH) and one alcohol-(–OH)) presented a 1.48° contact angle and a distinct increased H2-production activity (48.5 mmol·h−1·g−1), whereas the TiO2-PA grafted by propane-1,2,3-tricarboxylicacid (Just lack of one alcohol-(–OH) compared with TiO2-CA) showed a 30.95° contact angle and a decreased H2-production activity (19.3 mmol·h−1·g−1) compared to the unmodified TiO2 (25.8 mmol·h−1·g−1), indicating that the super hydrophilic-electrons acceptor is vitally important to the photocatalytic activity of TiO2. Based on the present results, the carbonyl group (–C=O) possess a stronger reducing capability and act as “electrons acceptor”, while the only alcohol-hydroxyl group (–OH) in TiO2-CA can decrease the mass transfer resistance and serve as “super hydrophilic absorber”. Considering its mild preparation, inexpensive cost, and admirable efficiency, the super hydrophilic-electrons acceptor with dual functional groups regulated TiO2 can become a promising way for potential application in photocatalytic field.

Directly preparing well-dispersed ultra-hydrophilic NiFeP nanoparticle/Mxene complexes from spent electroless Ni plating solution as efficient hydrogen evolution catalysts

A novel approach is proposed to prepare well-dispersed ultra-hydrophilic NiFeP nanoparticle/Mxene complex by recovering Ni, P, and organic acid from spent electroless Ni-plating solution. The mechanism of NiP-based nanoparticle formation and size regulation during the hydrothermal process is analyzed. Ni2+ chelated with sodium citrate in the electroless Ni plating effluent anchors on the Ti3C2 surface with -OH functional groups by chemical reaction and charge adsorption owing to Mxene surface negativity. The as-prepared ultrafine NiFeP nanodots are connected with alkali-induced Ti3C2 Mxene nanosheets, which possess ultra-hydrophilic performance and rapid H2 bubble desorption behavior. The introduction of alkali-induced Ti3C2 MXene as a substrate controls particle agglomeration in the hydrothermal crystallization process and achieves perfect dispersed distribution of NiFeP nanoparticles to further increase the specific surface area of catalyst. Consequently, the NiFeP/Ti3C2 nanohybrid catalyst exhibits outstanding hydrogen evolution reaction (HER) electrocatalyst performance as a result, with an overpotential of 122 mV at 10 mA cm−2, quick reaction kinetics of 68 mV dec−1, and strong long-term stability over 24 h in 1 M KOH. This research develops a strategy for directly preparing high-value catalyst materialization from spent electroless Ni-plating solution.

Adsorptive behavior of multi-walled carbon nanotubes immobilized magnetic nanoparticles for removing selected pesticides from aqueous matrices

The present work synthesized two new materials of functionalized multi-walled carbon nanotubes (MWCNT–OH and MWCNT–COOH) impregnated with magnetite (Fe3O4) using solution precipitation methodology. The resulting MWCNT–OH–Mag and MWCNT–COOH–Mag materials were characterized by scanning electron microscopy coupled with energy dispersion X-ray spectroscopy, Fourier transform infrared, X-ray diffraction, atomic force microscopy, and electrical force microscopy. The characterization results indicate that the –OH functional groups in the MWCNT interact effectively with magnetite iron favoring impregnation and indicating the regular distribution of nanoparticles on the surface of the synthesized materials. The adsorption efficiency of the MWCNT–OH–Mag and MWCNT–COOH–Mag materials was tested using the pollutants 2,4-D and Atrazine. Over batch studies carried out under different pH ranges, it was found that the optimal condition for 2,4-D adsorption was at pH 2, while for Atrazine, it was found at pH 6. The rapid adsorption kinetics of 2,4-D and Atrazine reaches equilibrium within 30 min. The pseudo-first-order model described 2,4-D adsorption well. The General-order model described better atrazine adsorption. The magnetically doped adsorbent functionalized with –OH surface groups (MWCNT–OH–Mag) demonstrated superior adsorption performance and increased Fe-doped sites. The Sips model described the adsorption isotherms accurately. MWCNT–OH–Mag presented the greatest adsorption capacity at 51.4 and 47.7 mg g−1 for 2,4-D and Atrazine, respectively. Besides, electrostatic forces and complexation rule the molecular interactions between metals and pesticides. The leaching and regeneration tests of the synthesized materials indicate high stability in an aqueous solution. Furthermore, experiments with wastewater samples contaminated with the model pollutants indicate that the novel adsorbents are highly promising for enhancing water purification by adsorptive separation.

Characterization and evaluation of antibacterial and wound healing activity of naringenin-loaded polyethylene glycol/polycaprolactone electrospun nanofibers

Antibiotic resistance is one of the main reasons for the prolonged wound-healing process in the world. Therefore, natural compounds that possess excellent antioxidant, anti-inflammatory, and antimicrobial properties, can promote the high performance of therapeutic avenues in wound treatment. We report the preparation and evaluation of Naringenin (Nrg), a poorly water-soluble model ingredient, loaded Polycaprolactone (PCL)/Polyethylene glycol (PEG) nanofibers (NFs) as a novel antibacterial wound dressing. The electrospinning method was used to produce a smooth nanofiber. The structure, morphology, components interactions, contact angle, swelling ratios, tensile strength, antibacterial activity, and cell biocompatibility have been investigated. The SEM images revealed that linear morphology, homogeneous, and smooth surface nanofibers had been prepared. The electrospun mats show sustained Nrg-releasing properties at a high concentration of Nrg. It supplemented the FT-IR results that exhibit the cross-link between the –OH functional group of Nrg and C=O of PCL. The results illustrated significantly enhanced antibacterial performance of mats when minimal Nrg was applied in nanofibers, compared to the higher Nrg amounts in NFs. The non-toxic nature of mats was confirmed by increased survival of human fibroblast cells in MTT assay. In in vivo wound injury model in rat, the Nrg-loaded mats shows comparable re-epithelialization and wound closure to commercially available phenytoin ointment. Altogether, the study addresses the Nrg-loaded PCL/PEG NFs mats that can serve as the prototype biodegradable and antibacterial wound dressing to treat cutaneous wound infection.

Green Synthesis and Biological Activity Investigation of New Pyrimidotriazinoazepines

In this research, one-pot multicomponent reactions of isatins, electron deficient acetylenic compounds, α-haloketones, ammonium acetate, isocyanates and hydrazonoyl chlorides in aqueous media at room temperature was investigated for the production of novel derivatives of pyrimidotriazinoazepine in excellent yields. The synthesized pyrimidotriazinoazepines have OH and NH functional groups that have acidic hydrogen and show high antioxidant activity. These synthesized compounds also displayed antimicrobial activity by using the disk diffusion procedure and two Gram-positive and Gram-negative bacteria. The employed process for production of pyrimidotriazinoazepines has some benefits such as short time of reactions, excellent efficiency of product and easy separation of products. Highlights In medicinal chemistry, the heterocyclic compounds have a well-known subject due to having wide area of biological activities of these compounds. Therefore these compounds are very important and for the synthesis of these compounds existed many procedures. Multicomponent reactions (MCRs) is one of the process for the preparation of biological activities heterocyclic compounds with many benefits such as having atom economic, an useful and excellent efficiency in the generation of heterocyclic compounds relative to many stage reactions for preparation of organic compounds The present procedure avoids the use of toxic solvent. Azepines, which have a seven-membered aza-heterocyclic fused aromatic ring, are of interest because of their biological activity and use as building blocks for natural product synthesis and drug discovery.

Experimental study on treatment of high ash coal slime by three-products flotation

ABSTRACT In this work, a three-product slime flotation experiment was conducted utilizing a two-stage direct flotation method with the BS collector and dodecane reagent system to maximize the flotation efficiency and reduce the flotation tailings along with an increase in its ash content. Modern analytical methods, such as X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) were used for analyzing the surface characteristics of the samples and their interaction with collectors. The results demonstrated a significantly higher ash content of secondary flotation tail coal compared to the primary one with increasing reagent dose. Ash content for clean coal ranges from 8.00% to 9.00% when the overall net coal output surpasses 85%, and it rises to 30.00% to 50.00% for flotation tail coal. The surface hydration membrane and BS collector form a hydrogen bond through the -OH functional group, which results in increased hydrophobicity and effectiveness of flotation.

Pretreatment of Biogas Slurry by Modified Biochars to Promote High-Value Treatment of Wastewater by Microalgae

High concentrations of contaminants such as ammonia nitrogen and organic matter in full-strength wastewater severely inhibit the growth of microalgae, contributing to lower biomass accumulation and contaminant removal efficiency. To overcome this limitation, modified biochars prepared from pine sawdust and sugarcane bagasse were used in this study as an adsorbent–desorbent for the pretreatment of wastewater to promote the growth of microalgae. The results showed that the two modification methods (acid/alkaline modification and magnesium salt modification) used in the experiment could increase the abundance of oxygen-containing functional groups. Moreover, magnesium salt modification could effectively improve the pore structure of biochar surfaces and increase the specific surface areas. Compared with the pristine biochars, the adsorption performance of the modified biochar was found to be significantly higher for nutrients in wastewater. The adsorption capacity of the acid/alkaline-modified pine sawdust biochar reached 8.5 and 16.49 mg∙g−1 for ammonia nitrogen and total organic carbon in wastewater, respectively. The magnesium salt modified pine sawdust biochar achieved a more comprehensive nutrients adsorption capacity of 15.68, 14.39, and 3.68 mg∙L−1 for ammonia nitrogen, total organic carbon, and total phosphorus, respectively. The mechanism of ammonia nitrogen adsorption was mainly the complexation of surface -OH functional groups, while the adsorption mechanism for phosphate was mainly the complexation of -OH and Mg-O functional groups and the chemical precipitation of MgO or Mg(OH)2 attached to the surface.

Synthesis of functional poly(amidoamine) dendrimer decorated apple residue cellulose for efficient removal of aqueous Hg(II)

Water pollution caused by Hg(II) exerts hazardous effect to the environment and public health. The design and fabrication of eco-friendly bioadsorbents for efficient removal of Hg(II) from aqueous solution is a promising strategy. Herein, a series of bioadsorbents were synthesized by the decoration of apple residue cellulose with different generation (G) Schiff base functionalized poly(amidoamine) (PAMAM) dendrimers (SA-G0/CE, SA-G1.0/CE and SA-G2.0/CE). The structures of SA-G0/CE, SA-G1.0/CE and SA-G2.0/CE were characterized and their adsorption performances were determined comprehensively by considering various factors. The maximum adsorption capacity of SA-G0/CE, SA-G1.0/CE and SA-G2.0/CE for Hg(II) are 1.18, 1.73 and 1.88 mmol·g−1, respectively. The as-prepared bioadsorbents exhibit competitive adsorption capacity as compared with other reported adsorbents. Moreover, they exhibit remarkable adsorption selectivity toward Hg(II) with the coexistence of Ni(II), Cd(II), Mn(II), or Pb(II). The bioadsorbents display satisfactory adsorption performance in real water sample and can be reused with good regeneration property. Adsorption mechanism reveals that the functional groups of OH, –CONH–, CN and NC take part in the adsorption for Hg(II). The work not only opens a pathway to realize the reuse of apple residue, but also provides a promising strategy to construct efficient bioadsorbents for the decontamination of Hg(II) from aqueous solution.

Synthesis and characterization of a citric and lipoic acids-derived dendrimer

The paper describes the synthesis and characterization of two third generation dendrimers from citric acid and a variant with a dendron terminated with lipoic acid. FTIR and C NMR confirmed the presence of signals characteristic for the dendrimer functional groups OH, C-O, C=O, C-H and C-S. DSC showed that, unlike citric acid, the dendrimer is amorphous. SEM revealed changes in the structure of citric acid particles in each dendrimer generation. In addition, the structure was more homogeneous. Dendrimers are hydrophobic due to ester linkages. Contact angle > 90° confirms their hydrophobic character. Moreover, the dendrimer with a dendron terminated with lipoic acid absorbs Cu+2 and Fe+3metal ions, so it can be used as an adsorbent for heavy metals.

Colorimetric detection of silver ions in different pH conditions using Pongamia pinnata leaf extract derived carbon dots

In this study, carbon dots (PPCDs) with OH and COOH functional groups were synthesized using Pongamia pinnata leaf extract as a carbon source by oxidation and a hydrothermal process. The colorimetric sensing results reveal the intensity of PPCDs enhancement upon the addition of the different concentrations of the silver ions, with LODs of 7.8, 0.758, and 0.340 μM in 5.1, 7.2, and 10 pH conditions, respectively. On the other hand, point-of-care kit (POC) data exhibits an intensive band that appeared after the addition of the silver ions at three pH conditions. The formation of the OH and COOH functionalities on the surface of the PPCDs might be responsible for the highly selective and sensitive detection of the Ag+ ions through metal–ligand charge transfer complex formation.

Polysaccharide Modified Cathodes for High-Capacity Rechargeable Nonaqueous Li–O2 Batteries

Nonaqueous rechargeable Li-O2 batteries are recognized as possible alternatives to the currently established Li-ion battery technology for next-generation traction by virtue of their high specific energy. However, the technology is still far from commercial realization mainly due to the performance-limiting reactions at the cathode. The insulating discharge product, Li2O2, can passivate the cathode leading to issues such as low specific capacity and early cell death. Herein, the -OH functionalities at the cathode, incorporated by polysaccharide addition, are shown to enhance the discharge capacity and cyclability. The -OH functional group (high pKa) at the cathode helps to stabilize the intermediate, LiO2, via an energetically favorable pathway and delays the precipitation to Li2O2, without any parasitic reaction, unlike the other reported low pKa additives. The role of the functionalities is studied using various experimental techniques and first principles density functional theory based studies. This approach provides a rational design route for the cathodes that provide high capacities for the emergent Li-O2 batteries.

Lanthanum phosphate as catalyst in the reaction of 5-HMF formation

Lanthanum phosphate (LP) has been synthesized by sol-gel method at room temperature. The synthesized catalyst was characterized by X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), pyridine adsorption FTIR, N2 adsorption-desorption and SEM-EDX. The XRD results show that LP has a hexagonal structure. The FTIR spectra of LP showed O=P-O bending vibrations, P-O vibrations (from phosphate tetrahedral distortion), P-O symmetrical strain vibrations and PO43- bending vibrations, each of which was characterized by the appearance of a peak at 613, 530-620, 950 and 538-621 cm-1. The presence of the OH functional group was indicated by a peak at 3450-3700 cm-1, which was strengthened by the H-O-H bending vibration that appeared at 1629 cm-1. The surface area, pore volume and pore diameter of LP are 51.04 m2/g, 0.21 cm3/g and 13.31 nm, respectively. SEM image showed that agglomerated solids with irregular shapes were obtained from the synthesis. Catalytic testing indicates that the acidity of the catalyst has main role in the formation of 5-HMF.

SARS-CoV-2 suppression depending on the pH of graphene oxide nanosheets.

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) inactivation of pH-dependent graphene oxide (GO) nanosheets is presented. The observed virus inactivation using an authentic virus (Delta variant) and different GO dispersions at pH 3, 7, and 11 suggests that the higher pH of the GO dispersion yields a better performance compared to that of GO at neutral or lower pH. The current findings can be ascribed to the pH-driven functional group change and the overall charge of GO, favorable for the attachment between GO nanosheets and virus particles.

Ultrasensitive ammonia gas sensor based on Ti3C2Tx/Ti3AlC2 planar composite at room temperature

Two-dimensional (2D) transition metal carbides (MXene) have attracted great attention for device applications due to their unique structures and excellent properties, such as high electrical conductivity and abundant functional groups on the surface. However, gas sensors based on Ti3C2Tx MXene have the problems of high detection limit and poor long-term stability. Herein, we report a simple method to prepare Ti3C2Tx/Ti3AlC2 planar composite gas sensing materials using high molar ratio of HCl and LiF with Ti3AlC2 as a framework. The Ti3C2Tx/Ti3AlC2 planar composite gas sensor has a high sensitivity, good selectivity and low detection limit for NH3, which can detect 50 ppb (1.2%) at room temperature ((25 ± 2) ℃). Furthermore, the gas sensor has good repeatability and long-term stability. After 120 days, the response of the gas sensor to 500 ppb of NH3 fluctuated little due to the Ti3AlC2 as a framework. The superior performances can be attributed to the special heterojunction between Ti3C2Tx and Ti3AlC2 and the high proportion of -O and -OH functional groups on the surface of Ti3C2Tx/Ti3AlC2 composite. This study provides an important reference for the realization of high performance NH3 sensing by Ti3C2Tx.

Experimental assessment of biobutanol degradation exposed to automotive components: A material compatibility approach

This study investigates the corrosive nature of gasoline engine parts such as piston, ring and valve exposed to various biobutanol ratios by static immersion method at different immersion durations. After immersion, variations in the surface morphology and elemental compositions of the metal samples were studied with the help of SEM and XRD results. The degradation in fuel characteristics such as density, viscosity and TAN were investigated as per the ASTM standards. According to the experimental findings, the piston sample is identified as least resistive than other components and resulted in more corrosive oxides. Among the various fuel blends, the degradation of fuel samples and corrosion rate of metals are comparatively higher for pure butanol and lower for gasoline (Bu0 <Bu20 <Bu50 <Bu100). The oxygen content that exists in the biobutanol chemical composition promotes the corrosiveness of the blends. To balance that, the OH functional group of biobutanol acts as a corrosion inhibition factor to restrict aggressive corrosion. Even though Bu100 ended with a higher corrosion rate, it can be used as a standalone fuel in gasoline because the results achieved were within the acceptable limit and has no severe influence on the failure of engine components due to corrosion.

Antibacterial properties of binuclear Zn(II)-azomethine complexes derived from diaminodiphenylsulphide bridged spacer

Antimicrobial resistance of microbes against treatment that once could cure, has inspired an urgent need for new drugs development. Accordingly, three binuclear Zn(II)-Schiff bases complexes ZnLa - ZnLc were prepared by direct reaction of the ligands La-Lc with Zn(II) ions in equimolar ratios bearing salicyldehydes with OH, NO2 and Cl functional groups. The synthesized compounds ZnLa - ZnLc were evaulated against Gram positive (Enterococcus faecalis NCIMB 13280, Streptococcus mutant ATCC 25175™ and Staphylococcus aureus ATCC 6538™) and gram negative (Escheria coli NCTC 12900, Salmonella typhi and Pseudomonas aeruginosa ATCC 15442) bacterial strains, respectively, by agar well diffusion and broth microdilution techniques. The minimum inhibitory concentration (MIC90) values were calculated by microplate reader at 550 nm to optimum result. It was found that all the synthesized compounds showed promising antibacterial activity against the genus Streptococcus mutant followed Staphylococcus aureus and Escheria coli. Binuclear Zn(II) complexes had a superior antibacterial activity compared to their parent Schiff base ligands. In general, 3,4-dihydroxy derived Schiff bases alongwith their relevant complexes exhibited magnificent antibacterial activity and hence merits to be established as promising keystone for subsequent antimicrobial drug advancement.

The Use of Pyrolytic Char Derived from Waste Tires in the Removal of Malachite Green from Dyeing Wastewater

The organic dye malachite green (MG) poses a potential risk of cancer and fertility loss in humans and aquatic organisms. This study focused on a modified pyrolytic char (PC) derived from waste tires to efficiently remove MG from wastewater. Modified PC has rich -OH functional groups, higher BET (Brunauer-Emmett-Teller) surfaces of 74.4, 64.95, and 67.31 m2/g, and larger pore volumes of 0.52, 0.47, and 0.62 cm3/g for NaOH, Na2CO3, and CaO modification, respectively. The pseudo-second-order model fit the adsorption well, and the maximum equilibrium adsorption capacity was 937.8 mg/g for PC after CaO activation (CaO-PC). NaOH-modified PC (NaOH-PC) showed the best fit with the Langmuir model (R2 = 0.918). It is suggested that alkali-modified waste tire pyrolytic char could be a potential adsorbent for removing MG from dye-containing wastewater.

Green approach in anticorrosive coating for steel protection by Gliricidia sepium leaf extract and silica hybrid

The lack of non-toxic, biodegradable and easily available green corrosion inhibitor that offer analogous anticorrosive property as that of commercial toxic inhibitors is the main tailback in the area of anticorrosive coatings. Current work presents a novel green corrosion inhibitor Gliricidia sepium leaf extract and investigation of its anticorrosive activity on steel in saline environment. Promising results from preliminary analysis of crude extract prompted to the isolation of active fraction and subsequent identification of major corrosion inhibitor in it. Structural elucidation substantiated the presence of disaccharide sucrose along with two other low yield components in the active fraction. The –OH functional group present in the sucrose moiety contributes towards developing a protective layer at the metal-electrolyte interface thereby retard corrosion. The crude extract explored as a novel green alternative in epoxy protective coatings via engineering an organic–inorganic hybrid GSL-PAS. The prepared hybrid coating offered an exceptional corrosion resistance than that of reported hybrids and commercial anticorrosive pigments. Two months continuous electrochemical study validated the durability of the prepared hybrid epoxy coating, authenticated the advantage of harmonious action of active and passive inhibitor GSL and PAS, respectively, in the epoxy matrix. The present work provides a new hope to the future researchers for the application of plant extract inhibitor in protective polymer coatings without hesitation.

Application of electrospun composite nanofibers as an efficient sorbent for extraction of pesticides from food samples

Herein, the composite of polylactic acid (PLA)/ Iron-based metal-organic framework (r-MIL-88A)/ Cellulose electrospun nanofibers was fabricated; and then, applied as a novel sorbent for thin-film micro-extraction (TFME) of four selected pesticides followed by GC-FID analysis. From the evaluation of scanning electron microscopy, Fourier transform infrared spectroscopy energy dispersive X-ray spectroscopy and X-ray diffraction, the successful fabrication of composite nanaofibers was approved. The presence of r-MIL-88A/Cellulose with large surface area and plenty of OH-functional groups results in improving PLA extraction efficiency. The effect of various main parameters on extraction efficiency was evaluated. The LODs (based on S/N = 3) were in the range of 1.0 to 1.5 ng mL−1. Intra-day and inter-day relative standard deviations (RSDs) were in the range of 4.8% - 5.6% and 5.2%-6.4%, respectively. In addition, the fiber to fiber relative standard deviations were observed in the range of 5.2%–12.3%. By using the optimized factors, acceptable linearity ranges were obtained in the range of 3.0-1900.0 ng mL−1 for metribuzin and ethofumasate, and 5.0-2000.0 for atrazine and ametryn (R2 = 0.9913-0.9967). The developed method was investigated in fruit juice, vegetables, milk and honey samples, and recoveries (79.3-95.6%) indicate that the PLA/r-MIL-88A/Cellulose can be a prominent composite film for the extraction of the target analytes in various samples.

Effect of active composite ionic liquids treatment on chemical structure and wettability of coal

To investigate the effect of different ionic liquid composite solutions on the wettability and chemical structure of coal dust, 14 ionic liquid compound solutions with various composite ratios were selected to act on long flame coal. Through the contact angle measuring instrument, 14 ionic liquid compound solutions were optimized, and 4 ionic liquid compound solutions with the same anion/cation were selected. The wetting agent with good water retention performance in the 4 kinds of composite solutions was selected by the water retention experiment. FTIR was used to research the change of functional group content in the coal treated by the 4 kinds of composite solutions. The results displayed that the contact angle of [Bmim][BF4]/[Emim][BF4] solution with the mixture ratio of 1:5 on the coal surface reached the min value of 34.483°. The [Bmim][BF4]/[Bmim][Cl] solution with a compounding proportion of 1:5 had the best water retention performance. The hydrophilic and hydrophobic functional groups of long flame coal treated by ionic liquid composite solutions had changed significantly. The [Bmim][BF4]/[Emim][BF4] composite solutions with the compounding proportion of 2:4 and 1:5 and the [Bmim][BF4]/[Bmim][Cl] composite solutions with the compounding proportion of 2:4 and 1:5 can not only increase the content of hydrophilic functional groups OH⋯O, Si–O–Si, COC, CO, and CO, but also decrease the content of hydrophobic functional groups CH2 and 2H. By analyzing the relationship between coal wettability and functional groups, it was discovered that the hydrophilic functional group CO was the primary functional group affecting the contact angle, and –OH and COC were the primary functional groups affecting the moisture content of coal samples. In this essay, the novel composite wetting agent type was prepared by compounding ionic liquid solutions with the same anion/cation in pairs, which has certain guiding significance for further using the novel composite moistening agent to improve the wettability of coal and preventing and control mine dust.