Study of selective enhancement of surface hydrophobicity on magnesite and quartz by N, N-Dimethyloctadecylamine: Separation test, adsorption mechanism, and adsorption model

2022 ◽  
pp. 152482
Author(s):  
Haoran Sun ◽  
Wanzhong Yin ◽  
Jin Yao
Keyword(s):  
Adsorption Mechanism ◽  
Surface Hydrophobicity ◽  
Adsorption Model ◽  
Selective Enhancement ◽  
Separation Test

Mucin Coating on Hydrophobic Polymer Materials

1999 ◽  
Vol 599 ◽  
Author(s):  
L. Shi ◽  
K. D. Caldwell
Keyword(s):  
Submaxillary Gland ◽  
Surface Concentration ◽  
Surface Hydrophobicity ◽  
Contact Angles ◽  
Polymer Materials ◽  
Adsorption Model ◽  
Kinetics Parameters ◽  
Water Contact ◽  
Long Term Observation

AbstractIn this work, the adsorption isotherm and kinetics of bovine submaxillary gland mucin (BSM) onto a hydrophobic polystyrene surface were studied by the solution depletion method, in which mucin surface concentrations were analyzed by amino acid analysis. Using a Langmuir adsorption model and non-linear curve fitting, kinetics parameters, kon and koff were determined. The coating was found to be very stable with very limited desorption (less than 2%) from a long term observation. By measuring the water contact angles, the changes in surface hydrophobicity due to mucin coating were monitored on four polymer materials, namely polymethylmethacrylate (PMMA), polyurethane (PU), polystyrene (PS), and silicone. After coating, all the hydrophobic surfaces turned into very hydrophilic. A strict correlation between mucin surface concentration and surface wettability has been found.

scholarly journals Microwave-assisted preparation of manganese dioxide modified activated carbon for adsorption of lead ions

2020 ◽  
Author(s):  
Heng Yan ◽  
Wenhai Hu ◽  
Song Cheng ◽  
Hongying Xia ◽  
Quan Chen ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Manganese Dioxide ◽  
Microwave Heating ◽  
Metal Ion ◽  
Adsorption Mechanism ◽  
Lead Ions ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Fast Heating

Abstract In this study, manganese dioxide was evenly distributed on the surface of activated carbon (AC), and the porous structure of AC and the surface functional groups of manganese dioxide were used to adsorb the heavy metal ion Pb(II). The advantages of microwave heating are fast heating and high selectivity. The mole ratio control of the AC and MnO2 in 1:0.1, microwave heating to 800 °C, heat preservation for 30 min. The maximum adsorption capacity of the MnO2-AC prepared by this method on Pb(II) can reach 664 mg/L at pH = 6. It can be observed by SEM that manganese dioxide particles are dispersed evenly on the surface and pore diameter of AC, and there is almost no agglomeration. The specific surface area was 752.8 m2/g, and the micropore area was 483.9 m2/g. The adsorption mechanism was explored through adsorption isotherm, adsorption kinetics, FTIR, XRD, XPS. It is speculated that the adsorption mechanism includes electrostatic interaction and specific adsorption, indicating that lead ions enter into the void of manganese dioxide and form spherical complexes. The results showed that the adsorption behavior of Pb(II) by MnO2-AC was consistent with the Langmuir adsorption model, the quasi-second-order kinetic model, and the particle internal diffusion model.

scholarly journals Preparation of sustainable non-combustion filler substrate from waterworks sludge/aluminum slag/gypsum/silica/maifan stone for phosphorus immobilization in constructed wetlands

2019 ◽  
Vol 80 (1) ◽  
pp. 153-163 ◽  
Author(s):  
Guanghui Wang ◽  
Jingqing Gao ◽  
Rongxue Yang ◽  
Jingshen Zhang ◽  
Han Guo ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Phosphorus Removal ◽  
Adsorption Mechanism ◽  
High Efficiency ◽  
Removal Rate ◽  
Combustion Process ◽  
Speciation Analysis ◽  
Adsorption Model ◽  
Isothermal Adsorption ◽  
Phosphorus Adsorption

Abstract In this study, an artificial wetland filler matrix capable of effectively fixing phosphorus was prepared using a non-combustion process to save energy. To evaluate the adsorption performance of this filler, adsorption experiments were performed and the phosphorus adsorption mechanism characterization was studied. An alkaline environment was found to be conducive to the increase of adsorption capacity, but excessive alkalinity was not conducive to adsorption. Static adsorption experiments showed that the phosphorus removal rate could reach 95% in the simulated phosphorus-containing wastewater after adsorption completion. The adsorption process is closely simulated by the pseudo-second-kinetic adsorption model. The isothermal adsorption experiment data were consistent with the Langmuir and the Freundlich adsorption isotherms. The characterization results showed a large number of micropores and adsorption binding sites inside and on the surface of the filler. Speciation analysis on the adsorbed phosphorus revealed that chemisorption by calcium in this filler was the dominant adsorption mechanism. The research results of this study provide the basis and reference for the development of high-efficiency phosphorus removal filler in constructed wetlands.

Activation effect of lead ions on scheelite flotation: Adsorption mechanism, AFM imaging and adsorption model

2019 ◽  
Vol 209 ◽  
pp. 955-963 ◽  
Author(s):  
Liuyang Dong ◽  
Fen Jiao ◽  
Wenqing Qin ◽  
Hailing Zhu ◽  
Wenhao Jia
Keyword(s):  
Adsorption Mechanism ◽  
Lead Ions ◽  
Adsorption Model ◽  
Activation Effect ◽  
Afm Imaging

scholarly journals The Mo-Co-Al2O3 System. II) Model of Adsorption of Molybdenum on Al2O3 and on Co-Al2O3

1988 ◽  
Vol 5 (1) ◽  
pp. 57-64 ◽  
Author(s):  
M.I. Morales ◽  
M.N. Blanco ◽  
H.J. Thomas
Keyword(s):  
Adsorption Isotherms ◽  
Adsorption Mechanism ◽  
Equilibrium Constants ◽  
Spectroscopic Studies ◽  
Experimental Results ◽  
Equilibrium Adsorption ◽  
Adsorption Model ◽  
Adsorption Sites ◽  
Polymeric Species ◽  
Two Systems

A model which interprets the equilibrium adsorption of molybdenum on Al2O3 and on Co-Al2O3 is presented. This model assumes the adsorption of monomelic and polymeric species of molybdenum on two different adsorption sites of the support. It is proposed a) that the adsorption mechanism can be represented by two independent adsorption reactions; b) that each species is adsorbed only on one type of site, and c) that the adsorption isotherms can be represented by the sum of a Langmuir type expression for the monomer and a sigmoidal one for the polymer. By applying this model to the experimental isotherms obtained for the two systems under study (Mo/Al2O3 and Mo/Co-Al2O3), the equilibrium constants for adsorption on site 1 (K,) and on site 2 (K2) and the numbers of adsorption sites S1 and S2 have been estimated. This adsorption model was confirmed by experimental results data and by spectroscopic studies.

scholarly journals Synthesis and Characterization of Halloysite/Carbon Nanocomposites for Enhanced NSAIDs Adsorption from Water

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3754 ◽  
Author(s):  
Beata Szczepanik ◽  
Nina Rędzia ◽  
Laura Frydel ◽  
Piotr Słomkiewicz ◽  
Anna Kołbus ◽  
...  
Keyword(s):  
Density Functional ◽  
Structural Changes ◽  
Adsorption Mechanism ◽  
Nitrogen Adsorption ◽  
Infrared Spectrometry ◽  
Adsorption Model ◽  
Adsorption Method ◽  
Carbon Nanocomposites ◽  
Chemical Structures ◽  
Intra Particle Diffusion

The adsorption of ketoprofen, naproxen, and diclofenac (non-steroidal anti-inflammatory drugs, NSAIDs) on halloysite/carbon nanocomposites and non-modified halloysite were investigated in this work. Halloysite/carbon nanocomposites were obtained through liquid phase impregnation and carbonization using halloysite as the template and saccharose as the carbon precursor. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectrometry (FT-IR), and low-temperature nitrogen adsorption method were employed to study the morphological and structural changes of the halloysite/carbon nanocomposites. The effects of contact time, initial concentration of adsorbates, pH of solution, and mass of adsorbent on the adsorption were studied. Adsorption mechanism was found to fit pseudo-second-order and intra-particle diffusion models. The obtained experimental adsorption data were well represented by the Langmuir multi-center adsorption model. Adsorption ability of halloysite/carbon nanocomposites was much higher for all the studied NSAIDs in comparison to non-modified halloysite. Optimized chemical structures of ketoprofen, naproxen, and diclofenac obtained by Density Functional Theory (DFT) calculation showed that charge distributions of these adsorbate molecules and their ions can be helpful to explain the details of adsorption mechanism of NSAIDs on halloysite/carbon nanocomposites.

scholarly journals Magnetically modified corn cob as a new low-cost biosorbent for removal of Cu (II) and Zn (II) from wastewater

2020 ◽  
Vol 9 (2) ◽  
pp. 96-102
Author(s):  
Ajeng Yulianti Dwi Lestari ◽  
Achmad Chafidz ◽  
Anindita Ratih Hapsari ◽  
Wildan Denly Elnaufal ◽  
Silvi Nurukma Indri ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Adsorption Mechanism ◽  
Low Cost ◽  
Adsorption Model ◽  
Isothermal Adsorption ◽  
Adsorption Capacities ◽  
Magnetic Modification ◽  
Living Organisms ◽  
Digestive Health

Wastewater containing heavy metals can potentially harm the human and living organisms and also damage the environment and ecosystem. Wastewater containing total copper (Cu) and zinc (Zn) over the normal threshold will result in Wilson's disease and digestive health, respectively. One of the most widely used methods to remove heavy metals from wastewater is adsorption. One type of adsorbent that has gained interest among researchers was biomass-based adsorbent or biosorbent. In this work, magnetic modification was used to increase the adsorption capacity of the biosorbent. Therefore, the aim of this study was to determine the effect of magnetic modification of corncobs as biosorbent on the adsorption of Cu(II) and Zn(II) heavy metals from an aqueous solution. Magnetic modification with FeCl3.7H2O on corncobs has successfully increased the adsorption capability of Zn(II) and Cu(II) from aqueous solution. The optimum modification ratios for the adsorption of Zn(II) and Cu(II) were 1:2 and 2:1. The adsorption of these both heavy metals took place at temperature of 50°C with the adsorbent doses of 1 g and 1.5 g for Cu(II) and Zn(II), respectively. The highest adsorption percentages for the adsorption of Zn(II) and Cu(II) were 89.3% and 89.2%, respectively. Whereas, the maximum adsorption capacities of Cu(II) and Zn(II) were 75.76 mg/g and 63.93 mg/g, respectively. The adsorption mechanism of Zn(II) and Cu(II) has followed the Freundlich isothermal adsorption model.

scholarly journals Adsorption Isotherm Studies of Rhodamine B on Citrus sinesis Peel

2018 ◽  
Vol 3 (1) ◽  
pp. 47-53
Author(s):  
Gani Purwiandono ◽  
Puji Lestari ◽  
Wahyu Widodo ◽  
Marlina Marlina ◽  
Nadia Aprilia
Keyword(s):  
Adsorption Isotherm ◽  
Rhodamine B ◽  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Active Surface ◽  
Adsorption Model ◽  
Freundlich Model ◽  
Neutral Ph

Adsorption of Rhodamine B on Citrus sinesis peel biosorbent has been conducted. The adsorption process was carried out in neutral pH for 90 min. The active surface of the Citrus sinesis peel biosorbent was 15 m2/g and the density was 0.52 g/cm3. The adsorption mechanism of Rhodamine B on Citrus sinesis peel biosorbent was studied using 4 adsorption model; Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich. The adsorption fitted the Freundlich model with the regression value of 0.906. This indicates that the adsorption of Rhodamine B on the surface of Citrus sinesis peel biosorbent was a multilayer interaction.

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