Investigating the effect of temperature on calcium sulfate scaling of reverse osmosis membranes using FTIR, SEM-EDX and multivariate analysis

Ashfaq, Mohammad Y.; Al-Ghouti, Mohammad A.; Da’na, Dana A.; Qiblawey, Hazim; Zouari, Nabil

doi:10.1016/j.scitotenv.2019.134726

Cited by 60 publications

(9 citation statements)

References 52 publications

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“…One of the efficient functionalization methods being done in this aspect is the amine functionalization of GO NPs. The amination of GO was investigated in several studies using different amines and was found to enhance the GO properties such as the hydrophilicity, dispersibility, conductivity, antibacterial properties, surface area, adsorption capacity, mechanical and thermal stability, and the antifouling properties of the materials in contact with water like membranes [7]. Aminated GO NPs were considered as a promising nanofiller in various membrane processes like reverse osmosis (RO), forward osmosis (FO), nanofiltration (NF) and ultrafiltration (UF).…”

Section: Introductionmentioning

confidence: 99%

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

2021

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High-degree functionalization of graphene oxide (GO) nanoparticles (NPs) using polydopamine (PDA) was conducted to produce polydopamine functionalized graphene oxide nanoparticles (GO-PDA NPs). Aiming to explore their potential use as nanofiller in membrane separation processes, the spectral and structural properties of GO-PDA NPs were comprehensively analyzed. GO NPs were first prepared by the oxidation of graphite via a modified Hummers method. The obtained GO NPs were then functionalized with PDA using a GO:PDA ratio of 1:2 to obtain highly aminated GO NPs. The structural change was evaluated using XRD, FTIR-UATR, Raman spectroscopy, SEM and TEM. Several bands have emerged in the FTIR spectra of GO-PDA attributed to the amine groups of PDA confirming the high functionalization degree of GO NPs. Raman spectra and XRD patterns showed different crystalline structures and defects and higher interlayer spacing of GO-PDA. The change in elemental compositions was confirmed by XPS and CHNSO elemental analysis and showed an emerging N 1s core-level in the GO-PDA survey spectra corresponding to the amine groups of PDA. GO-PDA NPs showed better dispersibility in polar and nonpolar solvents expanding their potential utilization for different purposes. Furthermore, GO and GO-PDA-coated membranes were prepared via pressure-assisted self-assembly technique (PAS) using low concentrations of NPs (1 wt. %). Contact angle measurements showed excellent hydrophilic properties of GO-PDA with an average contact angle of (27.8°).

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Section: Introductionmentioning

confidence: 99%

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

2021

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“…The reason for this phenomenon may be that after treatment with sulfuric acid, the specific surface area and Ca 2+ active sites of calcite decreased, resulting in reduced NaOL adsorption. Additionally, water absorption peaks appeared on the surface of calcite treated with sulfuric acid, with the absorption peaks at 3555.2 and 3405.3 cm −1 arising from the O–H stretching vibration and the peaks at 1619.1 and 1688.1 cm −1 resulting from O–H bending vibrations [ 28 , 42 ], indicating that the surface of calcite became hydrophilic after the H 2 SO 4 treatment.…”

Section: Resultsmentioning

confidence: 99%

Effect of Sulfuric Acid Corrosion on Flotation Performance of Calcite by Changing Surface Roughness

Xing,

Sun,

et al. 2024

Molecules

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Surface roughness is a crucial factor that affects the flotation performance of minerals. In this study, the effect of sulfuric acid corrosion on the surface roughness of calcite flotation was investigated through microflotation tests, scanning electron microscopy (SEM–EDS), atomic force microscopy (AFM), Fourier transform infrared (FT-IR) spectroscopy, and contact angle analysis. Microflotation test results show that sulfuric acid treatment has a serious negative effect on the floatability of calcite. When the sulfuric acid dosage was 4 mL (3 mol/L), the flotation recovery of calcite was reduced to less than 19%. SEM–EDS and AFM results verified that the sulfuric acid treatment significantly changed the surface morphology of calcite, reduced the average surface roughness and surface area, and reduced the amount of active Ca2+ sites on the calcite surface. As characterized by FT-IR and contact angle analyses, the sulfuric acid treatment enhanced the hydrophilicity of the calcite surface and reduced the amount of sodium oleate adsorbed on the calcite surface. Consequently, sulfuric acid corrosion can reduce the average surface roughness of calcite and have a serious negative effect on the flotation performance of calcite.

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“…This also indicates the presence of chemical interaction between SO 4 2and Sn 4+ , which is in accordance with the XPS results. [32,47,48] To exclude the thermal decomposition of STRS, the FTIR spectra of STRS samples before and after heating were compared, as shown in Figure 3e,f. The same FTIR spectra indicate (green and blue lines) that STRS does not decompose during heating of 150 °C.…”

Section: Characterization Of Sno 2 and Sno 2 -Strsmentioning

confidence: 99%

Multifunctional Aminoglycoside Antibiotics Modified SnO₂ Enabling High Efficiency and Mechanical Stability Perovskite Solar Cells

Yan

Zhang

et al. 2023

Adv Funct Materials

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SnO 2 as an electron transport layer (ETL) has been widely used in regular planar perovskite solar cells (PSCs) owing to its high optical transmittance, less photocatalytic activity, and low-temperature processing. However, SnO 2 -based PSCs still face many challenges which greatly impair their efficiency and stability of PSCs. Herein, a novel and effective multifunctional modification strategy is proposed by incorporating streptomycin sulfate (STRS) molecules with multiple functional groups into SnO 2 ETL. STRS can significantly suppress SnO 2 nanoparticle agglomeration, improve the electronic property of SnO 2 , as well as reduce nonradiative recombination. At the same time, interfacial residual tensile stress is released and the interfacial energy level alignment becomes more matched. As a result, the STRS-modified PSCs achieve a higher efficiency of 22.89% compared to 20.61% of the control device and exhibit a hysteresis-free feature. The humidity and thermal stability of PSCs based on STRS-SnO 2 are significantly improved. Furthermore, the efficiency of flexible devices increased from 19.74% to 20.79%, and the devices still maintain >80% of initial PCE after 4500 bending cycles with a bend radius of 5 mm. This study provides a low-cost, facile, and efficient strategy for achieving high efficiency and stability in PSCs.

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Investigating the effect of temperature on calcium sulfate scaling of reverse osmosis membranes using FTIR, SEM-EDX and multivariate analysis

Cited by 60 publications

References 52 publications

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

Effect of Sulfuric Acid Corrosion on Flotation Performance of Calcite by Changing Surface Roughness

Multifunctional Aminoglycoside Antibiotics Modified SnO₂ Enabling High Efficiency and Mechanical Stability Perovskite Solar Cells

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Investigating the effect of temperature on calcium sulfate scaling of reverse osmosis membranes using FTIR, SEM-EDX and multivariate analysis

Cited by 60 publications

References 52 publications

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

Effect of Sulfuric Acid Corrosion on Flotation Performance of Calcite by Changing Surface Roughness

Multifunctional Aminoglycoside Antibiotics Modified SnO2 Enabling High Efficiency and Mechanical Stability Perovskite Solar Cells

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Multifunctional Aminoglycoside Antibiotics Modified SnO₂ Enabling High Efficiency and Mechanical Stability Perovskite Solar Cells