Potassium hydroxide-impregnated char sorbents (KOH/char) prepared via an ultrasonic-assisted method were used for SO2 removal from flue gas. ... X-ray diffraction (XRD), Fourier-transform infrared spectroscopy, and scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS) were used to analyze both the chemical and physical ...
XRD analysis was carried out on powder samples to investigate the structural changes with the treatment with acid (nitric acid) and alkaline (potassium hydroxide).
In this study, the preparation of chars from municipal sewage sludge was carried out using chemical activation with potassium hydroxide (KOH). The main objectives were to (1) investigate the effect of KOH activation on the characters of the sewage sludge char, (2) explore the influence of KOH activation on the stabilization of heavy metals in activated chars, and (3) …
Ma et al. [27] used potassium hydroxide activated magnetic microporous loofah sponge biochar to remove imidacloprid, registering a maximum adsorption capacity of 738 mg g −1, whereas when a ...
The effects of hydrothermal temperature, concentration, and excess rate of potassium hydroxide on the leaching rate of alumina were investigated. The products …
Geosil 14517, the potassium silicate compound shows a multitude of peaks, which indicates that the compound contains further constituents besides potassium silicate (expected peaks at 28, 34 and ...
X-ray diffraction (XRD) measurements were performed using a Philips, Xpert JEOL-8630 diffractometer with Cu kα 1 radiation (λ = 1.5405 A°) at 40 kv and 30 mA with a scanning speed of 4°min − 1. The crystallite sizes of nickel hydroxide and nickel oxide were estimated using the Scherer equation.
diffraction (XRD) patterns were recorded with a Bruker D2 PHASER instrument with a Cu Kα radiation source; scanning was conducted over 35−80° (2θ). An inductively coupled plasma optical emission spectrometer (ICP-OES, Agilent 725) was used to detect Pd. The surface compositions were evaluated with an XPS photometer (Thermo, K-α) using a
Using hydrazine solutions or tetraethyl ammonium hydroxide under nitric acid or -ray radiation conditions at ambient tempera- tures, -Mn 2 O 3 nanocrystals were reported [103][104][105].
With increasing climate variability, a sustainable crop production approach remains an indispensable concern across the globe. In this study, P retention/availability of MgCl2.6H2O/KOH modified Douglas fir biochar was assessed. The MgCl2·6H2O/KOH treated Douglas fir biochar was prepared by sequentially treating Douglas fir biochar with magnesium …
For enriching the silicates, the cement was dissolved in potassium hydroxide and sucrose extraction solution prepared at 9:1:1 in 300 ml deionized water at 95°C. After 1 minute of stirring, the solution was vacuum filtered using an 11 μm cellulose filter paper in a Buchner funnel. ... XRD data were acquired on the as-received and selectively ...
The in situ formation of potassium hydroxide (KOH) can also be ruled out by the comparison with JCPDS #015-0890. Therefore, the XRD pattern at 800 °C confirms the …
The inorganic polymers were prepared by mixing amorphous silica (Microsilica U 983, Elkem) with a highly concentrated solution of potassium hydroxide in distilled water. In …
Here, the activated carbon (AC) was first produced by potassium hydroxide (KOH) activation from pistachio shells. Subsequently, the obtained AC was modified with hydrogen peroxide (H 2 O 2) activation.Cu (II) and Zn (II) ions adsorption using the KOH-AC-H 2 O 2 was carried out from wastewater. The correlation coefficient (R 2) values in the adsorption of KOH …
In the realm of supercapacitor applications, the fabrication of coin cell supercapacitors with superior performances played a crucial role. In this wo…
Characterization studies including SEM, XRD and FTIR were performed to examine the structure and chemistry of the derived activated hydrochar. The hydrochar sample (BP-180) when activated with a KOH/hydrochar ratio of 3 and an activation temperature of 700°C has a well-developed microstructure with a surface area and pore volume of …
Geopolymer pastes are studied with XRD, DTA/TGA, SEM. ... Common activators are sodium and potassium hydroxide, sodium and potassium silicate solutions (water glass) and sodium carbonate. Geopolymerization starts with dissolution of alumina and silica from the raw materials as soon as they are mixed.
The effect of an alkali treatment (potassium hydroxide) on the properties of a commercial activated carbon has been studied. The aim of the treatment was to improve the adsorption properties of...
Also, Surface modification techniques, such as potassium hydroxide (KOH) activation, further enhance biochar properties, resulting in increased surface area, pore volume, and the formation of K 2 CO 3 and KHCO 3 species [38]. By incorporating renewable KOH-activated biochar as a partial substitute for binders in MKPC formulations, a low-carbon ...
To follow the influence of doping with other alkaline cations on the phase transformation of γ-Al 2 O 3, γ-Al 2 O 3 was doped with ammonium hydroxide (NH 4 OH), potassium hydroxide (KOH), and lithium hydroxide (LiOH) until the pH of the samples reached 7.5, 9.5, or 11.5, respectively. The thermal treatment temperature for all samples was 1200 ...
Effect of potassium hydroxide concentration on the photo-electrochemical performance of titanium oxide prepared through the high voltage ... effect of the calcination temperatures on the electrodes anodized for 10 min at 50 V potential in 0.5 M potassium hydroxide bath was studied by recording XRD patterns of electrodes exposed to different ...
The resulting char was chemically activated by immersing it in a potassium hydroxide (1:3 ratios) solution for 24 h. The mixture was then heated to 800 °C under nitrogen for 2 h. ... XRD measurements were performed using a BRUKER D2 PHASER diffractometer with CuKα radiation at a wavelength of 1.5406 Å. The XRD data were collected over a 2θ ...
Nanocrystals of ZnO were prepared by chemical method using Zn (II) acetate and potassium hydroxide as the starting materials and methanol as solvent. The material were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), electron diffraction analysis (EDS), UV–Visible ...
Download scientific diagram | XRD pattern of aluminum hydroxide. from publication: Preparation of β-dicalcium silicate (β-C2S) and calcium sulfoaluminate (C3A3CS¯) phases using non-traditional ...
Powder activated carbon (PAC) treated with potassium hydroxide (KOH). PAC-KOH was used to synthesize multiwall carbon nanotubes using chemical vapor deposition …
The effect of an alkali treatment (potassium hydroxide) on the properties of a commercial activated carbon has been studied. ... No phases containing any potassium compounds can be detected using XRD method for the carbon treated with KOH. Figure 1. The effect of the KOH on the XRD spectra of the WG12 carbon. XRD: X-ray Diffraction.
Treatment with potassium hydroxide led to the formation of intermediate layers of potassium titanate on the surfaces of titanium substrates, while apatite was subsequently deposited onto the intermediate layer. ... Thin-film XRD (D/Max 2500PC, Rigaku, Japan) was used to characterize the crystalline phases of both native Ti samples and treated ...
Download scientific diagram | XRD patterns of the mixture prepared with different molar ratios of activated Al(OH) 3 /Al 2 (SO 4 ) 3 @BULLET18H 2 O/K 2 SO 4 Al(OH) 3 /Al 2 (SO 4 ) 3 @BULLET18H 2 O ...
Recent development of the Rietveld method for X-ray powder diffraction for multi-phase mixtures provides a means to overcome the difficulties of the earlier XRD analyses, resulting in a …
It was prepared by slow pyrolysis at 400 °C after treating the biomass with potassium hydroxide for activation. These biochars were characterized thoroughly (SEM, SEM–EDX, TEM, FTIR, XRD, elemental analyses, and …
XRD: X-ray Diffraction. from publication: Surface characteristics of KOH-treated commercial carbons applied for CO 2 adsorption | The effect of an alkali treatment (potassium hydroxide) on the ...
One carbon's surface has been modified with potassium hydroxide while the other is plain. Can anyone suggest what is the inference from these graphs. ... The XRD of the modified sample shows ...
The in situ formation of potassium hydroxide (KOH) can also be ruled out by the comparison with JCPDS #015-0890. ... the EDS analysis shows a significant deviation from the nominal values. As described earlier in XRD and Raman analysis, potassium ion is not incorporated into the iron oxide lattice due to the larger size of K + than Fe 3 ...