Brunauer Emmett Teller Surface Research Articles

A New V-Based Metal–Organic Framework Synthesized from Pyrene-Based Linker

A new vanadium based metal–organic framework (MOF), termed V-TBAPy, V2O2(C44H22O8)·9.5H2O, was designed and solvothermal synthesized. Crystal structure analysis showed that V-TBAPy is constructed from VO(CO2)2 rod-shaped SBUs (SBUs = secondary building units) and 1,3,6,8-tetrakis(p-benzoate)pyrene (TBAPy4–) linker to adopt the frz architecture highlighted by 1D channel of 9.3 Å and 4.0 × 9.4 Å2 in the structure. V-TBAPy was characterized by powder x-ray diffraction analysis (PXRD), thermal gravimetric analysis (TGA), Fourier transform infrared (FT-IR), elemental analysis (EA) and N2 adsorption measurements at 77 K. The resulted analyses indicated the highly thermal stability and permanent porosity of V-TBAPy with the Brunauer–Emmett–Teller surface (BET) area derived from the adsorption data of V-TBAPy to be 1620 m2 g–1. Furthermore, the rod-shaped morphology and the nano-size V-TBAPy were also confirmed by the scanning electron microscope (SEM) analysis suggesting the promising employment of the obtained material for adsorption and catalysis.

Characteristics and Mechanism of Pb2+ Adsorption From Aqueous Solution Onto Biochar Derived From Microalgae and Chitosan-Modified Microalgae

With increasing aquatic heavy metal pollution and eutrophication, using algae to prepare novel adsorbent materials for remediating heavy metal pollution has recently attracted research attention worldwide. However, microalgae biochar exhibits poor adsorption capacity in certain conditions, and little is known regarding microalgae biochar modification using chitosan. Chitosan has been previously used to directly modify microalgae biochar; however, in this study, chitosan is used to modify algae powder used to prepare biochar. Therefore, in this study, chitosan was used as a microalgae biochar modifier to enhance its applicability and adsorption capacity. Accordingly, two new types of microalgae biochars, chitosan-biochar (CTS-BC) and biochar-chitosan (BC-CTS), were developed as an adsorbent material using Clostridium and adding chitosan as a modifier at different stages of its preparation. These developed microalgae biochars were characterized using Brunauer–Emmett–Teller surface area,X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy. The adsorption processes of these biochars can be well described by a pseudo-second-order kinetic model. Pb2+ was dominantly adsorbed by microalgal biochar through chemisorption. Following chitosan modification, several mino, cyano, and aromatic ring groups were attached onto the surface of the microalgal biochar. The Pb2+ adsorption capacity of the chitosan-modified biochar was better than that of the unmodified biochar. The maximum Pb2+ adsorption capacity of CTS-BC under acidic conditions (pH = 5) was 9.41 mg g−1, whereas that of BC-CTS under alkaline conditions (pH = 9) was 9.94 mg g−1, both were higher than that of unmodified microalgae biochar under similar conditions. CTS-BC and BC-CTS possessed excellent stability and reusability for Pb(II) adsorption, the adsorption efficiency still remained above 50% even after three cycles. This study demonstrated that adsorbent materials having a stronger heavy-metal adsorption capacity can be prepared by adding chitosan during different stages of the microalgae biochar preparation process.

Comparative analysis of linear and nonlinear equilibrium models for the removal of metronidazole by tea waste activated carbon.

Tea waste was carbonized at 400 °C for 45 min and modified with potassium hydroxide (KOH), to enhance the active sites for the adsorption of antibiotics. The developed tea waste activated carbon (TWAC) was used as a novel eco-friendly and cost-effective adsorbent for metronidazole (MZN) removal from aqueous solution. The textural and surface properties of the adsorbent were determined using Brunauer-Emmett-Teller (BET) and FT-Raman analysis. The BET surface was found to have increased from 24.670 to 349.585 after carbonization and KOH modification. The batch experimental parameters were optimized and equilibrium time was found to be 75 min. Linear and non-linear models were carried out on the adsorption isotherm and kinetics to determine the best fit for the adsorption data. The adsorption equilibrium data were well fitted by the Freundlich isotherm and pseudo-second order models, with higher regression correlation (R2) and smaller chi-square (χ2), as predicted by the non-linear model. The thermodynamic results revealed the adsorption of MZN as spontaneous, physical, and consistently exothermic in character. The activation energy value of 7.610 kJ/mol further revealed that the adsorption process is dominated majorly by physical adsorption. The removal of MZN onto TWAC was best described by the non-linear adsorption isotherm and kinetics model.

Sorption of Phenolic Acids on Powdered Carbon Prepared by Complex Processing of Spent Coffee Grounds

Activated carbons are prepared by conventional two-stage carbonization–activation processing and complex processing of spent coffee grounds. The latter method includes preliminary solvent extraction of organic compounds. The samples prepared by conventional and complex processing methods have a high BET (Brunauer–Emmett–Teller) surface area (SBET = 864 and 1089 m2/g, respectively), specific surface area of mesopores (400 and 464 m2/g), and total pore volume VΣ (0.68 and 0.87 mL/g). It is shown that the complex processing produces activated carbons with a specific surface area 27% higher, compared to the conventional method. We propose that this sorption material can be used in purification of pharmaceutical production effluents. The capacity of the carbons to adsorb phenolic acids, in particular, salicylic and sulfosalicylic acids, which represent pharmaceutical microimpurities, is studied. The equilibrium concentrations of salicylic and sulfosalicylic acids are determined spectrophotometrically at λ = 296 and 294 nm, respectively, using a UV-2450 instrument (Shimadzu, Japan). The carbon produced by complex processing exhibits the most effective sorption properties (18 mg/g). The carbon prepared by conventional method displays intermediate characteristics (13.3 mg/g), and a reference Natural Brand adsorbent derived from lignocellulose material has the lowest characteristics (11.4 mg/g). The same pattern is observed for adsorption of sulfosalicylic acid, with the saturation adsorption being lower for sulfosalicylic than salicylic acid. We can state that substances with good solubility in water exhibit poorer physical adsorption than those with limited solubility. Processing the experimental data within the Langmuir and Freundlich adsorption models suggests that adsorption of the phenolic acids on the highly porous sorbents follows the Langmuir model, i.e., adsorption occurs at active sites where a dynamic equilibrium is established between adsorption and desorption processes.

Efficient Synthesis of Amides Over Cu-Fe Decorated Multiwalled Carbon Nanotubes and Mesoporous Carbon Catalysts.

A mixture of Cu (10%) and Fe (1 to 9%) was deposited on multiwalled carbon nanotubes (MWCNTs) and mesoporous carbon (MC). The catalytic activity was investigated in a reaction between carboxylic acids/esters and aromatic amines. The physico-chemical properties of the materials were characterized by different analytical techniques such as powder XRD (X-ray diffraction), BET (brunauer emmett teller) surface area, XPS (X-ray photoelectron spectroscopy), TPD-NH₃ (thermal desorption spectroscopy), SEM-EDS (scanning electron microscopy-energy dispersive spectroscopy) and TEM (transmission electron microscopy). The catalytic activity was investigated in the synthesis of aliphatic and aromatic amides from aliphatic/aromatic carboxylic acids and esters with aniline/benzyl amine. The yields of the product/s were in the range 30 to 92% with 100% selectivity. The percentage yield of amides from esters was found to be less than that of corresponding acids. Cu along with 5% of Fe supported on MWCNTs was found to be a better catalyst than when supported on MC, with respect to the isolated yield of the product/s and recyclability. The catalytic activity of the materials had a good correlation with their surface acidity. A plausible reaction mechanism has been proposed.

Calcined alluvium of agricultural streams as a recyclable and cleaning tool for cationic dye removal from aqueous media

Abstract The purpose of the current study was to examine the potential of raw and calcined alluvium, prepared from water streams in agricultural land, as a novel adsorbent for removing methylene blue (MB) and methyl violet (MV) from the aqueous media. Central composite design (CCD) was used to optimize the adsorption process as well as the interaction between parameters (adsorbent dose, initial pH, ultrasonic time and initial dye concentration). The physicochemical properties and surface changes of raw and calcined alluvium were investigated using scanning and transmission electron microscopy (SEM and TEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and Fourier transform infrared spectroscopy (FTIR). The BET surface and pore diameter of the calcined alluvium was obtained 68.13 m2/g and 16.58 nm, respectively. Langmuir, Freundlich, and Tamkin equations were used to model the adsorption equilibrium. The results showed that the adsorption of the dyes is physical and desirable, and the interaction between the surfaces of the alluvium adsorbents with the pollutants is weak. The Langmuir adsorption capacity of the studied dyes using raw alluvium (MB: 49.36 mg/g and MV: 57.84 mg/g) and calcined alluvium (MB: 71.96 mg/g and MV: 78.13 mg/g) was calculated. Adsorption data were more consistent with the pseudo-second-order kinetic model. Also, the adsorption/desorption process was investigated for up to 10 cycles. The difference in the amount of dye adsorption efficiency for the fresh adsorbent and its 10th recycled one was only 5%, indicating that the adsorbent was stable and reusable.

Evaluating the toxicity of TiO2-based nanoparticles to Chinese hamster ovary cells and Escherichia coli: a complementary experimental and computational approach.

Titania-supported palladium, gold and bimetallic nanoparticles (second-generation nanoparticles) demonstrate promising photocatalytic properties. However, due to unusual reactivity, second-generation nanoparticles can be hazardous for living organisms. Considering the ever-growing number of new types of nanoparticles that can potentially contaminate the environment, a determination of their toxicity is extremely important. The main aim of presented study was to investigate the cytotoxic effect of surface modified TiO2-based nanoparticles, to model their quantitative nanostructure–toxicity relationships and to reveal the toxicity mechanism. In this context, toxicity tests for surface-modified TiO2-based nanoparticles were performed in vitro, using Gram-negative bacteria Escherichia coli and Chinese hamster ovary (CHO-K1) cells. The obtained cytotoxicity data were analyzed by means of computational methods (quantitative structure–activity relationships, QSAR approach). Based on a combined experimental and computational approach, predictive models were developed, and relationships between cytotoxicity, size, and specific surface area (Brunauer–Emmett–Teller surface, BET) of nanoparticles were discussed.

Effect of Initial Reactants and Reaction Temperature on Molten Salt Synthesis of CuCo2O4 and Its Sustainable Energy Storage Properties

We have prepared CuCo2O4 using 0.5 M NaNO3 and 0.5 M LiNO3 molten salts at different temperatures (410 and 610 °C) in the air. This was later used as an anode material for LIBs. The morphology, structure, and electrochemical properties of the products were observed using various techniques such as scanning electron microscopy, X-ray diffraction (XRD), Brunauer–Emmett–Teller surface and density method, cyclic voltammetry, and galvanostatic cycling tests. The XRD patterns showed a minor CuO phase in addition to the major CuCo2O4 phase in most of the reactant and salt combination. CuCo2O4 prepared using copper sulfate and cobalt sulfate at 610 °C and copper sulfate and cobalt acetate at 410 °C showed the best performance with capacities of 848 mAh g–1 and 882 mAh g–1 and capacity retentions of 93% and 94%, respectively.

Experimental Interactions Between Clay Minerals and Bacteria: A Review

Interactions between microbes and minerals have the potential to contribute significantly to global cycles of various processes and serve as a link between the geosphere and life. Clays and clay minerals occur commonly in agriculturally utilized soils, are naturally grown underground (soil and rock) and are used in construction material. Clay minerals serve as natural, geological and technical barriers in geotechnics and environmental geotechnics. Bacteria in turn are ubiquitous in natural soils, subsoils and rocks and are in permanent contact with clay minerals. There are numerous ways in which bacteria can interact with clay minerals and alter them: dissolution, refinement and transformation, reduction of trace elements incorporated in the clay minerals and uptake of trace elements from these minerals, e.g., by the production of siderophores and chelators and enhancement or reduction of adsorbance of trace elements on clay minerals. In addition, bacteria can influence layer charge, cation exchange capacity (CEC), exchangeable cations, Brunauer–Emmett–Teller surface, swelling and the rheological properties of clay minerals. The field of clay mineral–microorganism interaction is still wide open because of the large potential that the interactions of bacteria with clay minerals in soils and sediments may result in changes in clay mineral properties and behaviors. Further detailed studies on all these tentative changes and underlying mechanisms as well as broad surveys of quantifications of extents and rates of clay mineral–microorganism interactions, especially in mimicking natural systems, are highly required. This review summarizes the influences of various bacteria on the properties of different clay minerals as determined experimentally using viable bacteria.

Mixed Oxides, (Ni1–xZnx)Fe2O4 (x = 0, 0.25, 0.5, 0.75, 1): Molten Salt Synthesis, Characterization and Its Lithium-Storage Performance for Lithium Ion Batteries

We prepared solid solutions based on Ni, Zn, and Fe oxides to be used as nanomaterials for anodes of Li-ion batteries. The materials were synthesized using molten salt method with KCl as the molten salt. The prepared nanomaterials (Ni1–xZnx)Fe2O4 (x = 0, 0.25, 0.5, 0.75, 1) were subsequently characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), the Brunauer–Emmett–Teller surface and density methods. Cyclic voltammetry (CV) and galvanostatic cycling tests were then conducted to understand the lithium storage performance of the electrodes. Electrochemical impedance spectroscopy (EIS) was also performed to analyze the kinetics of our electrodes and other characteristics of the battery cell. The electrochemical properties of prepared compounds showed reversible capacities (mAh/g) of 706, 819, 603, 781, 637 for x = 0, 0.25, 0.5, 0.75, and 1 at the end of the 50th cycle.

Adsorption of Polychlorinated Dibenzo-p-Dioxins and Dibenzofurans Vapors on Activated Carbon

Activated carbon (AC) adsorption is an important method to control the emission of dioxins and dioxin-like congeners (polychlorinated dibenzo-p-dioxins and dibenzofurans [PCDD/Fs] and polychlorinated biphenyls [PCBs]), of other semi-volatiles (such as Polycyclic Aromatic Hydrocarbons) and heavy metals (mainly mercury) arising from municipal waste incineration and other effluents. Investigating the adsorption characteristics of AC for PCDD/Fs allows selection of the best AC types, to meet the new and more stringent PCDD/F emission standards. In this study, the adsorption of dioxins on three kinds of commercial AC was evaluated through three bench-scale experiments. A dioxin generator was applied to generate a PCDD/Fs containing gas stream with constant concentration. Physical properties of AC, including its density, Brunauer–Emmet–Teller–surface, pore volume, and pore size distribution, were considered. The results show that the removal efficiencies of PCDD/Fs correlate more strongly with pore volume (r2>0.93) than with the surface area (r2<0.48). Among the three types of AC tested, the coconut shell sample with wide pore size distribution reached the highest adsorption efficiency. Under the testing conditions used, the total removal efficiency reached over 96%, much more than the 81.7% efficiency achieved by lignite AC. In addition, the selectivity of lignite AC for 17 toxic PCDD/F congeners is distinct from the two other samples.

Characterization of Activated Carbon from Oil Palm Shell Prepared by H&lt;sub&gt;3&lt;/sub&gt;PO&lt;sub&gt;4&lt;/sub&gt; for Procion Red Dye Removal

Characterization of activated carbon from oil palm shell prepared by H3PO4and application for the removal of procion red dye was investigated. Oil palm shell was carbonized at 500°C and prepared by H3PO45 % with ratio of 1:3. Characterized activated carbon by Fourier Transform Infra Red Spectroscopy (FTIR), Brunauer Emmet Teller (BET) surface area, Scanning Electron Microscope-Energy Dispersive X Ray Spectrometry (SEM-EDS). The result indicated that functional groups on the activated carbon surface were influenced by acidic treatment. The activated carbon have surface area 385.991 m2g-1and volume of micro porous 0.201 cm3g-1. The SEM-EDS image showed that activated carbon have many porous structure and the strong peak of C was 92.7 %. Adsorption capacity of activated carbon prepared by H3PO45 % was 278.197 mg g-1which is higher than not chemical activation was 216.456 mg g-1at equilibrium time 5 h.

Preparation and Photocatalytic Properties of Bi&lt;sub&gt;2&lt;/sub&gt;WO&lt;sub&gt;6&lt;/sub&gt; with Different Morphologies

Bismuth tungstate (Bi2WO6) microcrystalline with different surfactant were successfully prepared by a facile hydrothermal route.The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and BrunauerEmmettTeller surface area (BTE) in detail. The photocatalytic activity of the samples was also evaluated using the degradation of Rh B at room temperature under visible light irradiation. It was found that the surfactant played important roles in the formation process of controlling the morphology and structure of the catalyst and also had a great influence on the catalytic activity. SDS and CTAB effectively improved the catalytic activity and PVP was good at controlling morphologies.

Preparation of benzene adsorption materials using waste activated alumina

A new type of benzene adsorption material was prepared by using the airtight heat treatment method. This method can directly transform the organic impurities of the activated alumina waste into carbon with adsorption capability. The microstructure and carbon content of materials were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), BET (Brunauer Emmett Teller) surface area analysis and elemental analysis. The influences of heat treatment temperature on the properties of the composite materials were discussed. The benzene adsorption capability of the material was investigated. The experimental results show that the optimal heat treatment process condition is airtight heating at 400°C for 2 h. The resulting sample has carbon mass fraction of 3.57%, specific surface area of 234.70m2/g, pore volume of 0.41m3/g, and average pore size of 6.59 nm. The samples show excellent benzene adsorption capability with an adsorption rate of 21.80%.

Decomposition of 2,2′,4,4′,5,5′-hexachlorobiphenyl with iron supported on an activated carbon from an ion-exchange resin

An activated carbon (AC) containing a high concentration (374mgg−1) of Fe was prepared by carbonization of an ion-exchange resin. To examine its chemical reactivity as a catalyst to decompose 2,2′,4,4′,5,5′-hexachlorobiphenyl (PCB-153), the decomposition parameters of temperature and time were varied under air or N2. Decomposition at 350°C was achieved within 15min under air and 30min under N2, and the efficiency of PCB-153 decomposition was 99.7% and 98.0%, respectively. An analysis of inorganic chloride ions revealed that PCB-153 was mineralized effectively during the decomposition. The Brunauer–Emmett–Teller (BET) surface area and pore volume of the AC were measured to assess the adsorption capacity before and after the decomposition. The differences between decomposition under air and N2 reflected the differences in the BET surface and pore volume measurements. A decomposition pathway was postulated, and the reactive characteristics of chlorine atoms loaded on the benzene rings followed the order of para>meta>ortho, which agrees with the calculated results from a density functional theory study.

The Pore Structure of Phosphoaluminate Cement

The effects of curing time and water-to-cement ratio (W/C) on the pore structure of phosphoaluminate cement (PAC) paste are here presented. Based on the adsorption and condensation theory, the adsorption isotherm of hardened paste was tested using the Brunauer-Emmett-Teller (BET) nitrogen adsorption method. The phase composition and morphology of hydration products cured at different times were analyzed using X-ray diffraction (XRD), and a hydration heat test instrument (HHT) was employed to determine the heat of hydration. The effects of curing time and W/C on the pore structure of PAC are significant. The adsorption isotherm is fitted to the second category based on the Brun-auer- Deming-Deming-Teller (BDDT) classification system. Adsorption volume was found to increase with W/C and then decrease with age. The hysteresis loop of PAC is fitted to the H3 type based on International Union of Pure and Applied Chemistry (IUPAC) guidelines, and the adsorption volume and area enclosed by the hysteresis loop were found to increase with W/C and then decrease with age. BET surface and saturated adsorbed volume of PAC both increase with W/C and decrease with curing time, which is attributable to the greater hydration that produces and changes the characteristics of the pore structure.

Criteria to Select Biochars for Field Studies based on Biochar Chemical Properties

One factor limiting the understanding and evaluation of biochar for soil amendment and carbon sequestration applications is the scarcity of long-term, large-scale field studies. Limited land, time, and material resources require that biochars for field trials be carefully selected. In this study, 17 biochars from the fast pyrolysis, slow pyrolysis, and gasification of corn stover, switchgrass, and wood were thoroughly characterized and subjected to an 8-week soil incubation as a way to select the most promising biochars for a field trial. The methods used to characterize the biochars included proximate analysis, CHNS elemental analysis, Brunauer–Emmett–Teller surface (BET) area, photo-acoustic Fourier transform infrared spectroscopy, and quantitative 13 C solid-state nuclear magnetic resonance (NMR) spectroscopy. The soil incubation study was used to relate biochar properties to three soil responses: pH, cation exchange capacity (CEC), and water leachate electrical conductivity (EC). Characterization results suggest that biochars made in a kiln process where some oxygen was present in the reaction atmosphere have properties intermediate between slow pyrolysis and gasification and therefore, should be grouped separately. A close correlation was observed between aromaticity determined by NMR and fixed carbon fraction determined by proximate analysis, suggesting that the simpler, less expensive proximate analysis method can be used to gain aromaticity information. Of the 17 biochars originally assessed, four biochars were ultimately selected for their potential to improve soil properties and to provide soil data to refine the selection scheme: corn stover low-temperature fast pyrolysis (highest amended soil CEC, information on high volatile matter/O–C ratio biochar), switchgrass O2/steam gasification (relatively high BET surface area, and amended soil pH, EC, and CEC), switchgrass slow pyrolysis (higher-amended soil pH and EC), and hardwood kiln carbonization (information on slow pyrolysis, gasification and kiln-produced differences).

Impact of the bacterium Pseudomonas fluorescens and its genetic derivatives on vermiculite: Effects on trace metals contents and clay mineralogical properties

Using bacteria of the strain Pseudomonas fluorescens wild type CHA0 and its genetic derivative strains CHA631, CHA77, CHA89, CHA400, CHA661 (which differ in one gene only) the changes in chemical, mineralogical and rheological properties of the clay mineral vermiculite affected by microbial activity were studied in order to test whether the individually different production of metabolites by the genetically engineered strains may alter the clay mineral vermiculite in distinct ways. With the novel strategy of working with living wild type bacteria, their genetic derivatives and clay, the following properties of the mineral altered by the various strains of Pseudomonas fluorescens were determined: grain size, X-Ray diffraction pattern, intercrystalline swelling with glycerol, layer charge, CEC, BET surface and uptake of trace elements. All experiments were carried out with suspensions containing the bacteria in the nutrient medium and abiotic control suspensions with the nutrient medium only. The wild type CHA0 and strains CHA631, CHA77, CHA89 caused a decrease in the apparent grain size whereas strains CHA400 and CHA661 caused an increase in apparent grain size due to aggregation. Aggregation was furthermore evidenced by the smaller BET (Brunauer–Emmett–Teller) surface. In the absence of bacteria the clay mineral incorporates Na + from the medium. In contrast this is inhibited by the wild type CHA0 and the genetic derivatives CHA631, CHA77, CHA89 whereas strains CHA400 and CHA661 allowed the exchange of K + and Mg 2+ against Na + in vermiculite. Among all analyzed the trace elements, Fe, Mn and Cu are the most interesting. Fe and Mn are taken up from the clay mineral by all bacterial strains whereas Cu is only removed from vermiculite by strains CHA0, CHA77, CHA400, CHA661. The latter mentioned strains all produce 2,4-diacetylphloroglucinol and monoacetylphloroglucinol which can complex Cu efficiently. Therefore the alteration of only one gene of the bacteria is causing significant effects on the clay mineral.

Kinetics on the decomposition of polychlorinated biphenyls with activated carbon-supported iron

The process of destroying polychlorinated biphenyls (PCBs) generates exhaust gases that contain low quantities of PCBs, which cannot be disposed of easily. Activated carbon (AC) can be used to adsorb residual PCBs after disposal of high-level PCBs. We examined the chemical reactivity of AC-supported iron as a catalyst to decompose PCB-153, and varied three decomposition parameters (temperature, time and iron concentration) under an atmosphere of either air or N 2. We measured the Brunauer–Emmett–Teller (BET) surface area and pore volume of AC to assess the adsorption capacity of AC before and after decomposition. At low temperatures the adsorption process was more important than the decomposition process. The decomposition process was completed within 30 and 60 min under air and N 2, respectively. The efficiency of PCB-153 decomposition at 350 °C for 120 min was ∼100.0% and 97.1% under air and N 2, respectively. Analysis of inorganic chloride ions revealed that PCB-153 was effectively destroyed during decomposition. The differences between decomposition under air and N 2 reflected differences in BET surface and pore volume.

Characterisation of surface roughness and wettability of salt-type minerals: calcite and barite

Salt-type minerals of calcium (calcite) and barium (barite) are important raw materials for metallurgical, chemical and agricultural industries. Flotation is the primary process for recovering these minerals from ores. This study reports the determination of the surface roughness and wettability characteristics of these salt-type minerals ground in ball, rod and autogenous mills. Surface roughness values of these minerals have been expressed by the calculated surface roughness (RBET) factors based on BET (Brunauer-Emmett-Teller) surface area measurements. The wettability characteristics (γC) of these minerals ground by three different mills were also determined by a microflotation technique using the EMDEE MicroFlot agitator. Finally, significant correlations were found between the surface roughness (RBET) and wettability (γC) characteristics. The results revealed that the γCvalues increase with increasing RBET values. This means that if a mineral has lower surface roughness value, it will float better with lower γC value that indicates more hydrophobic character. The empirical relationships could be stated as γC = a × RBET + b type of equations; where a and b are constants.