scholarly journals Green Synthesis of Nano Zinc Oxide/Nanohydroxyapatite Composites Using Date Palm Pits Extract and Eggshells: Adsorption and Photocatalytic Degradation of Methylene Blue

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 49
Author(s):  
Maha S. Elsayed ◽  
Inas A. Ahmed ◽  
Dina M. D. Bader ◽  
Asaad F. Hassan
Keyword(s):  
Methylene Blue ◽  
Zinc Oxide ◽  
Kinetic Model ◽  
Photocatalytic Degradation ◽  
Date Palm ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Nano Zinc Oxide ◽  
Order Kinetic Model ◽  
Nano Zinc

In this study, zinc oxide nanoparticles (ZnO) and nanohydroxyapatite (NHAP) were prepared in the presence of date palm pits extract (DPPE) and eggshells, respectively. Another four nanocomposites were prepared from ZnO and NHAP in different ratios (ZP13, ZP14, ZP15, and ZP16). DPPE and all nanomaterials were characterized using GC-MS, zeta potentials, particle size distributions, XRD, TEM, EDX, FTIR, and pHPZC. The characterization techniques confirmed the good distribution of ZnO nanoparticles on the surface of NHAP in the prepared composites. Particles were found to be in the size range of 42.3–66.1 nm. The DPPE analysis confirmed the presence of various natural chemical compounds which act as capping agents for nanoparticles. All the prepared samples were applied in the adsorption and photocatalytic degradation of methylene blue under different conditions. ZP14 exhibited the maximum adsorption capacity (596.1 mg/g) at pH 8, with 1.8 g/L as the adsorbent dosage, after 24 h of shaking time, and the static adsorption kinetic process followed a PSO kinetic model. The photocatalytic activity of ZP14 reached 91% after 100 min of illumination at a lower MB concentration (20 mg/L), at pH 8, using 1.5 g/L as the photocatalyst dosage, at 25 °C. The photocatalytic degradation of MB obeyed the Langmuir–Hinshelwood first-order kinetic model, and the photocatalyst reusability exhibited a slight loss in activity (~4%) after five cycles of application.

scholarly journals Investigation of Seeds and Peels of Citrullus colocynthis as Efficient Natural Adsorbent for Methylene Blue Dye

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1279
Author(s):  
Wafa Mohammed Alghamdi ◽  
Ines El Mannoubi
Keyword(s):  
Methylene Blue ◽  
Kinetic Model ◽  
Langmuir Isotherm ◽  
Order Kinetic ◽  
Citrullus Colocynthis ◽  
Natural Adsorbent ◽  
Spontaneous Process ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Mb Adsorption

Natural adsorbents as low-cost materials have been proved efficient for water remediation and have significant capacity for the removal of certain chemicals from wastewater. The present investigation aimed to use Citrullus colocynthis seeds (CCSs) and peels (CCPs) as an efficient natural adsorbent for methylene blue (MB) dye in an aqueous solution. The examined biosorbents were characterized using surface area analyzer (BET), scanning electron microscope (SEM), thermogravimetric analyzer (TGA) and Fourier transform infra-red (FT-IR) spectroscopy. Batch adsorption experiments were conducted to optimize the main factors influencing the biosorption process. The equilibrium data for the adsorption of MB by CCSs were best described by the Langmuir isotherm followed by the Freundlich adsorption isotherms, while the equilibrium data for MB adsorption by CCPs were well fitted by the Langmuir isotherm followed by the Temkin isotherm. Under optimum conditions, the maximum biosorption capacity and removal efficiency were 18.832 mg g−1 and 98.00% for MB-CCSs and 4.480 mg g−1 and 91.43% for MB-CCPs. Kinetic studies revealed that MB adsorption onto CCSs obeys pseudo-first order kinetic model (K1 = 0.0274 min−1), while MB adsorption onto CCPs follows the pseudo-second order kinetic model (K2 = 0.0177 g mg−1 min−1). Thermodynamic studies revealed that the MB biosorption by CCSs was endothermic and a spontaneous process in nature associated with a rise in randomness, but the MB adsorption by CCPs was exothermic and a spontaneous process only at room temperature with a decline in disorder. Based on the obtained results, CCSs and CCPSs can be utilized as efficient, natural biosorbents, and CCSs is promising since it showed the highest removal percentage and adsorption capacity of MB dye.

Photocatalytic Degradation of Methylene Blue by the La-N/TiO2 Composite and its Kinetic Enumeration

2017 ◽  
Vol 863 ◽  
pp. 20-25 ◽  
Author(s):  
Jing Li Gao ◽  
Ying Hui Han ◽  
Yu Juan Li ◽  
Xiao Hong Zhang
Keyword(s):  
Methylene Blue ◽  
Composite Material ◽  
Kinetic Model ◽  
Photocatalytic Degradation ◽  
Degradation Kinetics ◽  
Synergistic Effects ◽  
Kinetic Mechanism ◽  
Order Kinetic ◽  
Doping Amount ◽  
Preparation Conditions

Photocatalytic degradation kinetics of methylene blue in aqueous solution was systematically investigated using Ti-based composite material as the photocatalyst. The single-variable-at-a-time ( SVAT) method was employed. It studied the individual and synergistic effects of several classical parameters on photocatalytic efficiencies. The kinetic mechanism was systematically explored. The kinetics effects of the doping amount of La and N, calcination temperature and time, light intensity were studied in detail. The factors on the degradation of MB were in accordance with the pseudo first order kinetic model. This kinetic model followed the Langmuir–Hinshelwood model. The best preparation conditions were found in the experiments. It is proved that the Ti-based composite material is an effective adsorbent for the degradation of dye contaminated water.

scholarly journals Synthesis of Porous Material from Coal Gasification Fine Slag Residual Carbon and Its Application in Removal of Methylene Blue

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6116
Author(s):  
Yixin Zhang ◽  
Rumeng Wang ◽  
Guofeng Qiu ◽  
Wenke Jia ◽  
Yang Guo ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Kinetic Model ◽  
Porous Material ◽  
Coal Gasification ◽  
Raw Material ◽  
Maximum Adsorption Capacity ◽  
Residual Carbon ◽  
Order Kinetic ◽  
Activation Temperature ◽  
Foam Flotation

A large amount of coal gasification slag is produced every year in China. However, most of the current disposal is into landfills, which causes serious harm to the environment. In this research, coal gasification fine slag residual carbon porous material (GFSA) was prepared using gasification fine slag foam flotation obtained carbon residue (GFSF) as raw material and an adsorbent to carry out an adsorption test on waste liquid containing methylene blue (MB). The effects of activation parameters (GFSF/KOH ratio mass ratio, activation temperature, and activation time) on the cation exchange capacity (CEC) of GFSA were investigated. The total specific surface area and pore volume of GSFA with the highest CEC were 574.02 m2/g and 0.467 cm3/g, respectively. The degree of pore formation had an important effect on CEC. The maximum adsorption capacity of GFSA on MB was 19.18 mg/g in the MB adsorption test. The effects of pH, adsorption time, amount of adsorbent, and initial MB concentration on adsorption efficiency were studied. Langmuir isotherm and quasi second-order kinetic model have a good fitting effect on the adsorption isotherm and kinetic model of MB.

scholarly journals Removal Study of Crystal Violet and Methylene Blue From Aqueous Solution by Activated Carbon Embedded Zero-Valent Iron: Effect of Reduction Methods

2021 ◽  
Vol 9 ◽  
Author(s):  
Yongmei Wang ◽  
Tiantian Chen ◽  
Xiaolin Zhang ◽  
Teza Mwamulima
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Kinetic Model ◽  
Specific Surface ◽  
Surface Area ◽  
Crystal Violet ◽  
Zero Valent Iron ◽  
Order Kinetic ◽  
Adsorption Capacities ◽  
Order Kinetic Model

Zero valent iron (ZVI) particles were embedded into porous materials to avoid aggregation and separation problems in the controlled synthesis process. To investigate the adsorption mechanism of crystal violet and methylene blue, activated carbon (AC) and AC-based ZVI extraction by solid-phase and liquid-phase reduced approaches was conducted. Characterization methods of specific surface area, scanning electron microscopy (SEM), and x-ray diffractograms (XRD) were used to elucidate the structure of adsorbents, and the adsorption capacities of crystal violet and methylene blue were obtained under experimental conditions of various pH values (2.0–10.0), adsorption times (0–72 h), and temperatures (30–50°C). The adsorption of crystal violet/methylene blue was controlled by both chemisorption and reduction. The adsorption processes were fitted to a pseudo-second-order kinetic model, and that of reduction kinetics was suitable to pseudo-first-order kinetic model. The thermodynamic study revealed that the adsorption of crystal violet and methylene blue was endothermic and spontaneous, and the adsorption isotherms fitted well to the Langmuir model. Different adsorption capacities of crystal violet and methylene blue on various adsorbents were found, indicating that both the properties of adsorbents (pore size, specific surface area, and chemical functional groups) and the structures of adsorbates had significant effect on the removal of dye molecules.

scholarly journals Preparation and Characterization of Magadiite–Magnetite Nanocomposite with Its Sorption Performance Analyses on Removal of Methylene Blue from Aqueous Solutions

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 607 ◽  
Author(s):  
Mingliang Ge ◽  
Zhuangzhuang Xi ◽  
Caiping Zhu ◽  
Guodong Liang ◽  
Guoqing Hu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Adsorption Isotherm ◽  
Kinetic Model ◽  
Aqueous Solutions ◽  
Langmuir Adsorption Isotherm ◽  
Order Kinetic ◽  
Langmuir Adsorption ◽  
Adsorption Performance ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The magadiite–magnetite (MAG–Fe3O4) nanocomposite has great potential applications in the field of biomaterials research. It has been used as a novel magnetic sorbent, prepared by co-precipitation method. It has the dual advantage of having the magnetism of Fe3O4 and the high adsorption capacity of pure magadiite (MAG). MAG–Fe3O4 was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). The results showed that Fe3O4 nanoparticles were deposited on the interlayer and surface of magadiite. MAG–Fe3O4 was treated as an adsorbent for methylene blue (MB) removal from aqueous solutions. The adsorption properties of MAG–Fe3O4 were investigated on methylene blue; however, the results showed that the adsorption performance of MAG–Fe3O4 improved remarkably compared with MA and Fe3O4. The adsorption capacity of MAG–Fe3O4 and the removal ratio of methylene blue were 93.7 mg/g and 96.2%, respectively (at 25 °C for 60 min, pH = 7, methylene blue solution of 100 mg/L, and the adsorbent dosage 1 g/L). In this research, the adsorption experimental data were fitted and well described using a pseudo-second-order kinetic model and a Langmuir adsorption isotherm model. The research results further showed that the adsorption performance of MAG–Fe3O4 was better than that of MAG and Fe3O4. Moreover, the adsorption behavior of MB on MAG–Fe3O4 was investigated to fit well in the pseudo-second-order kinetic model with the adsorption kinetics. The authors also concluded that the isothermal adsorption was followed by the Langmuir adsorption isotherm model; however, it was found that the adsorption of the MAG–Fe3O4 nanocomposite was a monolayer adsorption.

Photocatalytic Degradation of Methylene Blue Dye from Aqueous Solutions in the Presence of Synthesized ZnO Nanoparticles

2021 ◽  
Vol 19 (8) ◽  
pp. 53-58
Author(s):  
Noor Al-Huda Baiee ◽  
Ayad F. Alkaim
Keyword(s):  
Methylene Blue ◽  
Zinc Oxide ◽  
Degradation Process ◽  
Catalytic Degradation ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Zinc Oxide Nanoparticle ◽  
Nano Zinc Oxide ◽  
Oxide Nanoparticle ◽  
Nano Zinc

The photo catalytic degradation of an aqueous solution of methylene blue dye has studied under different conditions of preparation Zinc oxide nanoparticles and study effect of various mass of zinc oxide on the removal of methylene blue dye and initial concentration of MB dye. Several techniques were used to determine the surface properties of the prepared nano-zinc oxide such as XRD, TEM. Results showed that, the phot catalytic degradation process was high at the beginning and then decreased with time. and the phot catalytic degradation efficiency, increased by increasing weight of zinc oxide nanoparticle from 0.05 g to 0.3 g. and decrease with increase weight of zinc oxide nanoparticle from 0.5 g to 0.7g. also showed that the best weight to removal MB dye 0.3 gm.

scholarly journals Syringa vulgaris leaves powder a novel low-cost adsorbent for methylene blue removal: isotherms, kinetics, thermodynamic and optimization by Taguchi method

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Giannin Mosoarca ◽  
Cosmin Vancea ◽  
Simona Popa ◽  
Marius Gheju ◽  
Sorina Boran
Keyword(s):  
Methylene Blue ◽  
Low Cost ◽  
Dye Adsorption ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Adsorbent Surface ◽  
Order Kinetic Model ◽  
Endothermic Process ◽  
Pseudo Second Order ◽  
Better Than

Abstract In this study, the potential of a new low-cost adsorbent, Syringa vulgaris leaves powder, for methylene blue adsorption from aqueous solution was investigated. The adsorbent surface was examined using SEM and FTIR techniques. The experiments were conducted, in batch system, to find out the effect of pH, contact time, adsorbent dose, initial dye concentration, temperature and ionic strength on dye adsorption. The process is best described by Langmuir isotherm and the pseudo second order kinetic model. Maximum adsorption capacity, 188.2 (mg g−1), is better than other similar adsorbent materials. Thermodynamic parameters revealed a spontaneous and endothermic process, suggesting a physisorption mechanism. A Taguchi orthogonal array (L27) experimental design was used to determine the optimum conditions for the removal of dye. Various desorbing agents were used to investigate the regeneration possibility of used adsorbent. Results suggest that the adsorbent material is very effective for removal of methylene blue from aqueous solutions.

Adsorption of methylene blue by using novel chitosan-g-itaconic acid/bentonite nanocomposite – equilibrium and kinetic study

2017 ◽  
Vol 75 (8) ◽  
pp. 1932-1943 ◽  
Author(s):  
Farzaneh Shakib ◽  
Ahmad Dadvand Koohi ◽  
Arash Kamran Pirzaman
Keyword(s):  
Methylene Blue ◽  
Adsorption Capacity ◽  
Itaconic Acid ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Oh Groups ◽  
Maximum Sorption ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
The Fourier Transform

In this study, novel chitosan-g-itaconic acid/bentonite (CTS-g-IA/BT) and chitosan/bentonite (CTS/BT) nanocomposites were synthesized for adsorption of methylene blue (MB) from aqueous solution. The process was pH-sensitive and maximum sorption was obtained at pH 6 (CTS-g-IA/BT) and 7 (CTS/BT) in 76 h agitation time using 0.03 g of nanocomposites for 50 mL of MB solution. The results showed that in pH less than 6, the adsorption capacity of CTS-g-IA/BT nanocomposite due to the existence of IA monomer is less than that of CTS/BT nanocomposite. The Fourier transform infrared spectroscopy (FTIR) spectrum of CTS-g-IA/BT revealed that both itaconic acid and BT present in the nanocomposite structure, and also the –OH groups of BT, –NH2 and –OH of CTS participated in nanocomposite formation. According to the FTIR results, a schematic diagram of the nanocomposite synthesis was presented. The kinetic results indicated that the adsorption of MB fitted well with the pseudo-second-order kinetic model. The equilibrium data followed Langmuir isotherm with the maximum adsorption capacity of 500 and 181.818 mg/g for CTS-g-IA/BT and CTS/BT nanocomposites, respectively. The negative values of Gibbs free energy change (ΔG0) and the positive values of ΔH0 confirmed that the adsorption process is spontaneous and endothermic. The positive values of ΔS0 suggested the randomness of adsorption at interface.

scholarly journals PREPARATION OF NOVEL HYBRID (ALMOND SHELL AND PLEUROTUS SAJOR CAJU) BIOSORBENT FOR THE REMOVAL OF HEAVY METALS (NICKEL AND LEAD) FROM WASTEWATER

2020 ◽  
Vol 5 (1) ◽  
pp. 1-7
Author(s):  
Aneeza Abdul Sattar
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Kinetic Model ◽  
Active Sites ◽  
Maximum Adsorption Capacity ◽  
Local Market ◽  
Order Kinetic ◽  
Almond Shell ◽  
Order Kinetic Model ◽  
Pleurotus Sajor Caju

Level of contaminants (Nickel and Lead) in aquatic ecosystems has increased due to discharge of industrial effluents in water. Hence, there is a need to remove heavy metals (Nickel and Lead) from the water. For removing heavy metals from water, hybrid biosorbent (Almond shell and Pleurotus sajor caju) was prepared. To prepare a novel hybrid biosorbent (Almond shell and Pleurotus sajor caju) for the removal of nickel and lead from waste water the study was conducted in the department of chemistry, university of agriculture Faisalabad. The biomass was collected from local market of Chiniot. Hybrid matrix (Almond shell and Pleurotus sajor caju) and heavy metals (Nickel and Lead) were prepared. Waste water was interacted with the developed hybrid metals (Nickel and Lead) and hybrid bio sorbent (almond shell and P.sajor caju).The maximum adsorption capacity q(mg/g) of nickel and lead obtained at l0mgL-l concentration is in the following order; hybrid biosorbent(87)>P.sajor caju(65)> almond shell(54) and hybrid biosorbent(85)>P.sajor caju(57)>almond shell(45). The maximum uptake for nickel obtained by almond shell, P.sajor caju, hybrid biosorbent (56%), (66%), (90%) for lead and (47%), (61%), (89%) for nickel. The adsorption of nickel and lead follows the 2nd order kinetic model. FTIR spectra show that there are various functional groups, active sites present in hybrid biosorbent (Almond shell and Pleurotus sajor caju). Maximum absorption of lead occurs at pH 5 and nickel at pH 3. The sorptions of heavy metals (Lead and Nickel) follow the pseudo 2nd order kinetic model. From the whole analysis it is concluded that Hybrid biosorbent calm of microbial and plant waste biomass was extremely functional in exclusion of lead and Nickel from wastewater.

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