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Effect of initial concentration dye and contact times on adsorption of GM dye at T=25°C, pH=12 and 350 rpm of stirring
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In this work we report the preparation of ZSM-5 (pyrr) with molar composition: 0.2057Na2O - 0.00266Al2O3 - SiO2-0.68Pyrr (pyrrolidine) - 40 H2O - 0.12H2SO4 by hydrothermal synthesis method. The sample is characterized using IR spectra, MEB and XRD. The removal of Methyl Green (MG) dye from aqueous solutions onto ZSM-5(pyrr.), is examined under vari...
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With the growing use of nanomaterials, it is essential to carefully determine whether they represent a risk for potential users. So far, validated stand-alone methods that allow a proper risk assessment are still rare. In the present study, cytotoxicity of CeO2 nanoparticles has been assessed. For this purpose, a variety of well-defined CeO2 nanopa...
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... Therefore, the amount of dye absorption per gram of sorbent is reduced. Comparison of methyl green dye adsorption capacity of ECS-MC with other modified chitosan and also different adsorbents such Table 1 (Rida et al. 2020;Alardhi et al. 2020aAlardhi et al. , 2020bMaghni et al. 2017;Yin et al. 2017;Lamia et al. 2016;Mahmoud et al. 2019;Arjomandi-Behzad et al. 2020;Bahgat et al. 2013;Bashandeh and Khalaji 2021b;Khalili et al. 2021;Sanati et al. 2021). The results confirm that the as-prepared ECS-MC is a good sorbent for the removal of methyl green dye. ...
New modified epichlorohydrin chitosan Schiff base (ECS-MC) was successfully synthesized and characterized by various techniques such as FT-IR, TGA, DSC, BET, XRD and SEM. In addition, methyl green (MG) removal efficiency from aqueous solution has been studied and the influence of solution pH, sorbent dose, initial MG concentration and contact time were investigated. The results of adsorption study indicated that 99.12% of MG dye were removed via adsorption using 0.02 g of ECS-MC at pH of 8 and 120 min solution shaking. Results showed high MG sorption capacity of 194.4 mg/g, when 0.005 g of ECS-MC was used as sorbent. Then, ECS-MC can be more efficient for removal of other cationic dyes.
Graphic Abstract
The mechanism of MG adsorption on the surface of ECS-MC depends on functional groups of both adsorbent and adsorbate. It was clear that the electrostatic interaction such as π–π and H-bonds between the sorbent and methyl green played a main role in MG adsorption.
... Likewise, according to ∆q, RMSE and χ 2 , the pseudo-second order model displays lower errors and is in good consistency with the experimental data. Similar phenomena have been reported for the adsorption of methyl green onto various adsorbent such as loofah fiber [59], titanium dioxide [60], zeolite H-ZSM-5 [69], carbon nanotubes [70], and graphene sheets [71]. ...
... A comparison of the adsorption capacity of methyl green onto CuO nanoparticles with other adsorbents reported by other researchers was shown in Table 5. It can be seen that CuO nanoparticles showed comparable adsorption capacity with respect to zeolite H-ZSM-5 [69] and grapheme oxide [62]. The adsorption capacity of CuO nanoparticles was higher than those of loofah fiber (18.2 mg g −1 ) [59] and bamboo [75], and was lower than that of titanium dioxide (384.6 mg g −1 ) [60], activated carbon from Brachychiton Populneus fruit shell [64], activated bentonite [63], and graphene sheets [71]. ...
... Loofah fiber [59] pH = 6.5; dose = 0.4 g/L; T = 25 • C 18.2 Bamboo [75] pH of solution; dose =1 g/L; T = 25 • C 20.4 Graphene oxide [62] pH = 7; dose = 0.1 g/L; T = 25 • C 28.5 Zeolite H-ZSM-5 [69] pH = 4; dose = 1 g/L; T = 25 • C 31.3 Graphene sheets-CoFe 2 O 4 nanparticles [71] pH of solution; dose = 1 g/L; T = 25 • C 47.2 Activated carbon from Brachychiton Populneus fruit shell [64] pH of solution; dose = 1 g/L; T = 20 • C 67.9 CoFe 2 O 4 /rGO nanocomposites [61] pH of solution; dose = 0.25 g/L 88.3 (CNTs-NiFe 2 O 4 ) [70] pH of solution; dose = 1 g/L; T = 25 • C 88.5 CNTs [70] pH of solution; dose = 1 g/L; T = 25 • C 146 Graphene sheets [71] pH of solution; dose = 1 g/L; T = 25 • C 203.5 Activated bentonite [63] pH of solution; dose = 0.1 g/L; T = 25 • C 335.3 Titanium dioxide [60] pH = 6.6; dose = 1 g/L; T = 25 • C 384.6 CuO nanoparticles (this work) pH of solution; dose = 2 g/L; T = 25 • C 28.7 ...
The aqueous extract from the bark of Punica granatum L. was invested to generate CuO nanoparticles from CuSO4 using a green, economical, ecological, and clean method. The synthesized nanoparticles were characterized and were successfully used as adsorbents for methyl green retention of an absorptive capacity amounting to 28.7 mg g−1. Methyl green equilibrium adsorption data were correlated to the Langmuir model following the pseudo-second order kinetics model. This study clearly corroborates that copper nanoparticles exhibit a high potential for use in wastewater treatment.
... Zeolites are a series of microporous aluminosilicate crystal with interconnected pores and channels in size range from 0.3 to 1 nm. Their threedimensional framework facilitates the adsorption of an organic molecule into its channel [17]. ZSM-5 is a type of zeolite that very potential to be developed as an adsorbent for an organic molecule. ...
Rhodamine B (RB) and Methylene Blue (MB) dyes adsorption using adsorbent ZSM-5 synthesized from Bangka kaolin were investigated in this study. The effects of the initial concentration, contact time and temperature on the adsorption process were also analyzed. The effect of the initial concentration and contact time played an important role in the adsorption process; however, the effect differs significantly in both dyes. The temperature plays little role in the dye adsorption process. The results showed the adsorption process occurred in ZSM-5 adhere to Langmuir isothermal adsorption model showing that the adsorption process occurred to be monolayer. Based on the kinetics studies, the pseudo-first-order kinetic model represents the adsorption kinetics that occurs for both dyes onto the synthesized ZSM-5. Thermodynamic parameters namely Gibbs free energy (ΔG°), standard entropy changes (ΔS°) and standard enthalpy (ΔH°) reveal that the adsorption process onto ZSM-5 for both dyes was spontaneous and exothermic.
Given the impact of climate change, it is becoming increasingly important to ensure a secure water supply in order to enable sustainable spatial development. Water shortages, which are already noticeable in many regions of the world, are thus hindering rural, urban and industrial development. Nowadays, approximately half of the world’s population is affected by water scarcity, albeit temporarily. Climate change is serving to further aggravate this situation since periods of drought are becoming increasingly common.
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Modified chitosan with various functional groups has high potential as an efficient adsorbent in removing water pollution. In this study, new magnetic adsorbent, bio-based chitosan/Fe2O3/NiFe2O4, was successfully prepared by green chemistry route involving mixing of chitosan as core moiety and Fe2O3/NiFe2O4 nanocomposite, and slow evaporation of solvent. Synthesized chitosan/Fe2O3/NiFe2O4 was characterized by FT-IR, TGA, XRD, VSM and FE-SEM. The FT-IR and XRD results confirmed that the successful preparation of chitosan/Fe2O3/NiFe2O4. Uniform dispersion of Fe2O3/NiFe2O4 nanoparticles with low aggregation was confirmed by FE-SEM. The as-prepared magnetic chitosan/Fe2O3/NiFe2O4 was developed as solid phase adsorbent to remove methyl green (MG) dye from aqueous solutions. Several important parameters such as contact time, pH, temperature and adsorbent dosage were investigated systematically. The high and fast MG dye removal (≈ 80%) occurs after 30 min. The optimal conditions for MG removal was recorded at pH = 8, contact time of 60 min, adsorbent dosage of 0.2 g and 25 °C and displayed a high MG dye removal percentage of 96.51% and adsorption capacity of 77.22 mg/g.
HZSM-5 (MFI type) of composition (Hx)[Al3+xSi12−xO24] × wH2O and nanocomposites NA/HZSM-5, NA:M/HZSM-5 (NA—nanoscale anatase; M = V, Ni, Ag) with Si/Al = 12, 25, 40, 300 (sp.gr. Pnma or P21/n; z = 8), as well as zeolites [(Ti4+xSi12−xO24] × wH2O (TS) with Si/Ti = 47, 53, 73.5 (sp.gr. Pnma) were studied by XRPD, XAS, FTIR-spectroscopy, BET, XPS, SEM, EDX, TPD, UV–VIS-spectroscopy, UV–DRS, and chemiluminescence methods. The results obtained together with photocatalytic, adsorption, antimicrobial, catalytic properties were analyzed using crystallochemical concepts and literature data. It was shown that NA or NA:M introduction into HZSM-5 leads, respectively, to the photodegradation of MeO dye in the UV region or difenoconazole in the visible range, and contributes to the appearance in the dark of adsorption (almost complete extraction of P(V), As(V), and Se(V) from aquatic environment) and bacteriostatic properties in respect to Staphylococcus epidermidis, Bacillus antracoides, and Escherichia coli for NA:Ag/HZSM-5(40, 300). The presence of titanium ions in NA nanoparticles on the HZSM-5 surface improves the catalytic activity in ethanol and propane (the best performance for NA/HZSM-5(25) and NA/HZSM-5(40), respectively) conversion. Determination of the composition (surface and bulk) and structure (statistical and local) of TS zeolites together with the found correlations made it possible to propose new catalysts in the reactions of propane, ethanol, and allyl chloride conversion.
A novel biomaterial which is of low cost, easily available and eco-friendly was identified from the seed pods of tecoma stans shrub. It was chemically activated using sulphuric acid and the resulting carbonaceous material was characterized by FTIR, SEM and BET Analysis. Its potential was investigated for the removal of methyl green dye. Batch mode studies were performed to optimize the reaction control variables such as temperature, pH, adsorbent dosage, adsorbent particle size, initial dye concentration and agitation time. The data obtained was analysed for best performance of the adsorbent. These examinations have led to the surface modifications of the adsorbent using iron oxides. Batch mode studies have proved maximum dye adsorption of 97.3% at pH 6 for a nominal adsorbent dose of 0.001 g/ml at room temperature. Isotherm investigation proved multilayered adsorption of the dye with the maximum adsorption of 158.74 mg/g. Kinetic modelling of the data for different concentrations confirmed pseudo second order mechanism. Thermodynamic parameters were evaluated and negative values of ΔG and ΔH proved exothermic nature of adsorption. Desorption studies were also performed to examine the regeneration capacity of the adsorbent.
