Introduction to Chemical Adsorption

Pseudo-second-order model, Langmuir isotherm and the thermodynamics deduced a spontaneous endothermic monolayer surface chemical adsorption process.

We also found that the adsorption process followed the pseudo-second-order kinetic model well, which confirmed the capture of KTP onto COF-NH2 was dominated by chemical adsorption.

Furthermore, Cr3+ is mainly absorbed by chemical adsorption, according with quasi-second-order kinetic model and Langmuir isotherm.

The adsorption experiment of methyl orange (MO) showed that the adsorption kinetics of APC-J-2-8 conformed to the quasi-second-order kinetic model, mainly chemical adsorption.

Through zeta potential measurements, solution chemistry calculations, and X-ray photoelectron spectroscopy, the major role of the selective chemical adsorption of Pb-BHA+, Pb-BHA-OL, and Pb(OH)-BHA-OL- on the surface of scheelite in the separation of scheelite from fluorite was revealed, along with the role of NaOL as an accelerator to improve the adsorption modes and capacities of Pb and BHA on scheelite.

Simultaneously, the catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), full-automatic physical-chemical adsorption instrument, and field emission scanning electron microscope (FESEM) to analyze the effect of Ce addition on the adsorption capacity and catalytic activity.

The results show that chemical adsorption was the main reason for the adsorption of Hg0 on ZnIn2S4 (1 1 0) surface.

The results reveal that the adsorption of H2O molecule on the surface of PuH2 (1 1 0) basically presents chemical adsorption, while the adsorption direction of H2O molecule parallel to the PuH2 (1 1 0) surface appears to be preferentially adsorbed on the top of Pu atom.

In addition, the pseudo-first-order model, pseudo-second-order model, and Elovich model all fitted the adsorption process well, which indicated that both physical adsorption and chemical adsorption existed simultaneously, in which physical adsorption played a dominant role and chemical adsorption played a minor role.

The results show that the kinetics was better described by the Elovich model when compared to pseudo-first order and pseudo-second order models, indicating that chemical adsorption occurs during the process.

The kinetics experiments indicated that the Cd(II) removal by B-LDHs-BC was through both the physical and chemical adsorption processes, and the liquid membrane diffusion was the rate-controlling step.

These results indicated that intraparticle diffusion and external mass transport were the main rate controlling steps of the adsorption of herbicides on sediment and that the chemical adsorption was dominant during the adsorption processes.

The adsorption process follows the pseudo-secondary adsorption kinetics model, indicating the chemical adsorption dominates the adsorption process.

The results showed that the adsorption of Cd(II) and Cu(II) by MgAl–[email protected] was conformed to the Langmuir-Freundlich model and PSO kinetics model, indicating single-layer chemical adsorption.

Adsorption kinetics carmine dye molecules onto Fe-CHAs followed the second-order kinetic equation and Langmuir model, indicating that adsorption of carmine dye molecules onto Fe-CHAs was mainly monolayer chemical adsorption.

Adsorption kinetics carmine dye molecules onto Fe-CHAs followed the second-order kinetic equation and Langmuir model, indicating that adsorption of carmine dye molecules onto Fe-CHAs is mainly monolayer chemical adsorption.

The kinetics are better described by the pseudo 2nd order kinetics model because of the physiochemical adsorption.

‎Additionally, the process of Pb2+ adsorption was consistent with the pseudo-‎second-order kinetics model, indicating that chemical adsorption was the dominant ‎mechanism of adsorption.

The adsorptions of penicillin on MCHCl and MCHAc were consistent with pseudo primary kinetics and the Langmuir adsorption isotherm model, and thermodynamic analysis indicated that the adsorption mechanism included physical and chemical adsorption.

Tested compounds inhibited CS corrosion through a physical-chemical adsorption mechanism that followed Langmuir adsorption isotherm model with a change in the free energy of adsorption from −35.

The kinetic of sorption agreed with the second-order model and the chemical adsorption is the rate-limiting step.

The adsorption experiment showed that the second-order kinetic equation had a good fitting effect on the adsorption curve of As (V) on the N-ZrO2-BC surface, which indicated that chemical adsorption was the main factor controlling the reaction rate.

Cr(VI) removal relied on the amount of Cr(VI) adsorbed on the particles of ZIF-8, and the mechanisms of Cr(VI) adsorption by ZIF-8 included chemical/physical processes and the rate-limiting step was the chemical adsorption.

Such adsorption behaviour obeyed the Weber-Morris intra-particle diffusion, pseudo-second-order kinetic and Freundlich isotherm models, suggesting that the adsorption behaviour was kinetically limited by the intra-particle diffusion and chemical adsorption steps and it was likely to be multi-layer adsorption.

The results of the batch experiments showed that the uptake equilibrium of HLPC-PO4 to U(VI) occurred within 20 min, and the kinetic simulation showed that the process was monolayer chemical adsorption.

The adsorption process of methyl orange by MSM was indicated as a non-spontaneous monolayer chemical adsorption process, which obeyed the pseudosecondorder kinetic model.

Meanwhile, the CoNi LDH flakes provide sufficient hydroxyl active sites to improve the strong chemical adsorption of polysulfides.

Moreover, the hierarchical Mn3O4/NC shell play a dual role in physical restricting and offering strong chemical adsorption of polysulfides.

The adsorption kinetics and isotherm analysis of the PVA/GO nanofiber film during the adsorption process showed that the adsorption of Cu2+ and MB by PVA/GO nanofiber film was mainly chemical adsorption, while the adsorption of CR was mainly physical adsorption.

The adsorption of Hg2+ on the CB was characterized using a kinetic model and an isothermal adsorption line, which revealed that the pseudo-second-order kinetic model and Langmuir isothermal model well represented the adsorption of Hg2+ on the CB, indicating that the adsorption was mainly chemical adsorption of the monolayer.

These indicated that the adsorption behavior was a single-layer chemical adsorption.

The adsorption process of Cu(II) on CS-PAR conformed to Langmuir and pseudo second-order models and belonged to a single-layer chemical adsorption process on the surface of a homogeneous medium.

Pseudo-second-order model, Langmuir isotherm and the thermodynamics deduced a spontaneous endothermic monolayer surface chemical adsorption process.

Diamane, the two-dimensional counterpart of diamond, is achieved from bi-layer graphene (BLG) or few-layer graphene (FLG) through surface chemical adsorption or high-pressure technology.

Through zeta potential measurements, solution chemistry calculations, and X-ray photoelectron spectroscopy, the major role of the selective chemical adsorption of Pb-BHA+, Pb-BHA-OL, and Pb(OH)-BHA-OL- on the surface of scheelite in the separation of scheelite from fluorite was revealed, along with the role of NaOL as an accelerator to improve the adsorption modes and capacities of Pb and BHA on scheelite.

Selective chemical adsorption on the surface-modified EOP decreases the pumping performance of EOP due to a decrease in the surface electric charge.

The acid/alkali modification effectively promotes the inductive effect of electron transfer between modified kaolin and heavy metals to form stable chemical adsorption.

8 eV around the Fermi level, demonstrating a stable chemical adsorption.

Furthermore, S-C bonds can enhance chemical adsorption of carbon for sulfur and improve the structural stability of the materials.

The contact angle measurement and atomic force microscopy (AFM) imaging indicated that, for the same concentration of sodium humate, the treatment by hydrogen peroxide could increase surface wettability and largely enhance chemical adsorption of humate on galena surface.

The in-situ embedded polar Fe3C nanoparticles are proved to possess excellent chemical adsorption and catalysis effect toward the immobilization-conversion of polysulfides and fast Li2S nucleation.

The Fe3O4-Si-IL and Si-IL nanocomposites show excellent chemical adsorption capacities as 653 and 472 mg g−1, respectively, during times ranging 90 to 110 min when they are used as adsorbents to remove Congo red (CR) dye as a water pollutant.

The subangstrom thickness resolution of ellipsometry enabled the real-time observation of single chemical adsorption and plasma-induced ligand removal/exchange events.

The sensitivity of the multiwavelength ellipsometry provided sufficient resolution to observe not only the minuscule changes in the growth-per-cycle (GPC) parameter, but also the single chemical adsorption (chemisorption) and plasma-assisted ligand removal events.

Among various metal-doped C24N24, the adsorption energies of NO2 on K- and Na-doped C24N24 are apparently lager than those of other gas molecules, which fall between the suitable range of strong physical adsorption and weak chemical adsorption.

The adsorption isotherms showed that the adsorption process was complex, combining physical and weak chemical adsorption, in good agreement with the Sips model.

Density functional theory calculation results revealed that a CNT played a key role in optimizing the distribution of bonding and antibonding states in the Fe 3d orbital, resulting in the outstanding ability of FeSA-N-CNT for PMS chemical adsorption and activation.

The outstanding ability of BFMN for PMS chemical adsorption and activation may attribute to the enhanced covalency and reactivity of Mn-O.

Both experiments and DFT calculations together suggest that N-doping enhances the electron transfers between Tg-C3N4 and LiPSs, leading to improved chemical adsorptions and catalytic effects towards the redox conversions of the active sulfur species.

Experiments and DFT calculations together suggest that P-doping enhances the electron transfers between P-NiSe2 and LiPSs, leading to improved chemical adsorptions and catalytic effects towards the redox conversions of the active sulfur species.

Herein, a flexible strain sensor was fabricated to generate carboxylated carbon nanotubes (CNTs-COOH) and silver nanoparticles (AgNPs) respectively on the polydopamine (PDA)-templated nylon/polyurethane (nylon/PU) fabric surface via a dip-coating technique and liquid-phase chemical adsorption reduction process.

The gas-phase chemical adsorption and decomposition of 2-CEES were demonstrated for the first time, with an estimated t1/2 of 1.

For oxygen atoms on the scheelite surface, Pb–MBHA has stronger chemical adsorption ability than Pb–BHA, and its adsorption made the scheelite surface more hydrophobic.

34 eV which can provide stronger chemical adsorption energies for Al and O.

OH, consuming chemical adsorption energy (~2.

The target pollutants undergo surface cleavage and convert H2O to ⋅OH, consuming chemical adsorption energy (∼2.

The presence of Ca2Fe2O5 with abundant oxygen vacancies significantly improves CO2 chemical adsorption and activation and Pr(Ca)Fe(Ni)O3-δ serves charge carrier matrix, and consequently leads to a high CO2 reduction reaction rate constant of 1.

Herein, promoted π electron transfer between a graphene substrate and cobalt phthalocyanine (CoPc) is achieved by introducing abundant intrinsic defects into graphene (DrGO), which not only generates more electrochemically active Co sites and leads to a positive shift of the Co2+/Co+ reduction potential but also enhances the CO2 chemical adsorption.

2 kcal mol−1, suggesting a great chemical adsorption.

2 kcal mol-1, suggesting a great chemical adsorption.

As a result, Bi-NC significantly features the effective chemical adsorption and remarkable redox catalyzation for polysulfides, corroborated by both computational and experimental demonstrations.

Furthermore, the effective chemical adsorption between SAPs and dust particles had a stable consolidation effect.

Pseudo-second-order model, Langmuir isotherm and the thermodynamics deduced a spontaneous endothermic monolayer surface chemical adsorption process.

This assumes that the adsorption mechanism is the chemical adsorption process.

The ammonium adsorption followed the pseudo-second-order kinetic model which suggests that the ammonium adsorption process is controlled by the chemical adsorption mechanism.

The energetic study showed that the adsorption energies ∣−ΔE1/2 ∣ of AlCl3 on H2TTPP and H2TPP are superior to 40 kJ/mol (chemical adsorption mechanism), whereas the adsorption mechanisms of FeCl3 and InCl3 took place via a physical process since they presented adsorption energy values lower than 40 kJ/mol.

The increased adsorption, especially chemical adsorption capacity, of the OE.

Due to the excess positive charge with a strong Lewis acidity and large chemical adsorption capacity, the bcc-Au38S2(S-Adm)20 nanocluster outperformed the hcp-Au30(S-Adm)18 and fcc-Au21(S-Adm)15 nanoclusters.

Owing to the strong chemical adsorption ability for polysulfide and superior electronic transportation, the polysulfide migration could be efficiently inhibited and the electronic conductivity is greatly improved.

For oxygen atoms on the scheelite surface, Pb–MBHA has stronger chemical adsorption ability than Pb–BHA, and its adsorption made the scheelite surface more hydrophobic.

For the adsorption of As2O3 on CuO surface, the “Osuf-Osuf bridge” site was the active site with the chemical adsorption energy of −1.

OH, consuming chemical adsorption energy (~2.

A coexistence process of physical and chemical adsorption existed in all ACs as predicted by the best fitting obtained with the Dubinin–Radushkevich, pseudo–second–order kinetic and Elovich models.

In addition, the pseudo-first-order model, pseudo-second-order model, and Elovich model all fitted the adsorption process well, which indicated that both physical adsorption and chemical adsorption existed simultaneously, in which physical adsorption played a dominant role and chemical adsorption played a minor role.

The adsorption of Hg0 was analyzed by various surface analysis methods, and the results proved that physical and chemical adsorption occurred.

989), indicating that chemical adsorption occurred on the adsorbent surface.

The value of $${\Delta}G_{{{\text{ads}}}}^{^\circ }$$ showed that 2MBT adsorbs on API-5L X60 surface via physical and chemical adsorption processes.

The kinetics experiments indicated that the Cd(II) removal by B-LDHs-BC was through both the physical and chemical adsorption processes, and the liquid membrane diffusion was the rate-controlling step.

Herein, a novel layered PI/g-C3N4 heterojunction was successfully prepared by a simple chemical adsorption method.

Using chemical adsorption method to recover Sb in sewage is of great value for both academic and industry research.

9934), which meant that monolayer and chemical adsorption dominated.

The kinetic adsorption process was well described by the pseudo-second-order model and chemical adsorption dominated the adsorption process.

876 kJ mol−1) and it was found that the adsorption is endothermic and spontaneous with a physicochemical adsorption nature.

929 kJ mol–1) with a physicochemical adsorption nature which includes an randomness enhancement at the solid/liquid interface with augment temperature ( Δ S 0 =0.

Moreover, the adsorption process might be a chemical adsorption according to kinetics fitting analysis of FCF.

It was found that the interaction between C5-PFK and Al (1 1 1) is stronger than that of Ag (1 1 1), which belongs to chemical adsorption according to the electronic properties results.

The azathioprine (AZA) electrochemical adsorption onto the screen-printed carbon electrodes (SPCE) modified with the reduced graphene oxide (RGO) sheets in the absence and in the presence of polyaniline-emeraldine salt (PANI-ES) is reported in this work.

The studied PIL aggregates show strong chemical adsorption onto the copper surfaces demonstrated by Fourier transform infrared spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy.

The results showed that the synergistic combination of surface adsorption and chemical adsorption played important role in the removal process.

Our results indicated that chemical adsorption played a crucial role in the Hg0 adsorption on the ZnSe (1 1 0) surface.

The results showed that L-malic acid forms a chemical adsorption film on the surface of aluminum waste dust particles that can prevent particles from contacting water and realizes hydrogen suppression by preventing the reaction from proceeding.

The study of the lubrication mechanism shows that the physical and/or chemical adsorption film formed by gallate ester molecules between friction pairs is the key factor for them to obtain friction-reducing and antiwear properties.

The superior performance of Cr-doped NiO NPs can be ascribed to the electron transfer among Ni-O-Cr bond, defective oxygen and chemical adsorption oxygen after Cr doping, which are beneficial for the gas adsorption and reaction on the surface of the sensing materials.

Calcination temperature has a great influence on SCR activity that a suitable one increased the surface Mn4+, Ce3+ and chemical adsorption oxygen, while a high one visibly decreased NOx conversion due to the rapid weakened oxygen absorption and lattice oxygen content.

In the current study, the density function theory (DFT) is used to investigate the chemical adsorption strength of NO2 gas molecule.

Transition metal phosphides (TMPs) feature relatively good electrical performance, mild synthesis, adequate chemical adsorption strength and exceptional catalytic capability for PS, which make them a cathode host/separator modifier for the new generation of Li–S batteries.