Adsorption properties of Cr(III) and Cr(VI) on natural (NCS), acid-activated (ACS) and base-activated (BCS) cherry stalks (CS) in Isparta were investigated in aqueous solutions. Batch adsorption ...studies had been completed with different initial chromium concentrations, pH, temperature, time and biosorbent dosage. Adsorption rapidly approached an equilibrium state between 10 and 60 min. The results displayed that the adsorption system was suitable for pseudo-second-order kinetics. Equilibrium isotherms (Langmuir, Freundlich and Dubinin–Radushkevich) were measured experimentally. The retention characteristics of Cr(III) onto NCS, ACS and BCS and Cr(VI) onto ACS were represented by Langmuir adsorption isotherms, while Cr(VI) ions onto NCS and BCS were compatible with Freundlich adsorption isotherms. The adsorption process was endothermic accompanied by a decrease in entropy and Gibbs energy. An artificial neural network (ANN) model was improved to estimate the efficiency of Cr(III) and Cr(VI) ion’s adsorption. The ANN model can predict the behaviour of the Cr(III) and Cr(VI) ion's adsorption under different circumstances. The results have shown that NCS, ACS and BCS biosorbents open up new possibilities and potential commercial uses in the cherry stalks.
The removal of hazardous dyes from water by magnetic biosorbents has received a lot of interest in recent studies. This is because they are inexpensive and simple to separate from the solution phase. ...In this study, nano-magnetic Tamarindus indica fruit seed biochar was combined with iron to create a green nano-magnetic/ biochar (BC) composite (nM-BC). Compared to unmodified biochar, modified biochar composite significantly improved the ability to adsorb methyl blue (MB) and malachite green (MG). The Dubinin-Radushkevich, Scathard, Freundlich, Langmuir, and Temkin models were used to analyze the adsorption equilibrium data, and the Langmuir isotherm (R2 =0.952–0.995) provided a good match to the results. Saturated BC adsorption capacities for MB and MG were 3.055 mg/g and 5.577 mg/g, respectively, while nM-BC values for MB and MG were 3.326 mg/g and 20.408 mg/g, respectively. The adsorption process is accurately described by the pseudo-second-order kinetic model. BC and nM-BC both passed four reusability tests. Utilizing FT-IR and SEM instruments BC and nM-BC were characterized. The study demonstrates that biochar can be enhanced with nano-iron which has a potent ability to remove dyes utilizing a green manufacturing approach.
► We prepared poly(methyl methacrylate)/n-hexadecane microcapsules by using emulsion polymerization and studied their applicability to textiles. ► Microcapsules have considerably high enthalpy and ...nano-sizes to be enough for textile applications. ► The fabrics treated with microcapsules are capable of heat storage depending on fabric construction and raw material of the fabric.
In this study, poly(methyl methacrylate)/n-hexadecane microcapsules were prepared using emulsion polymerization, and their applicability to textiles was studied. Two types of cross-linker, namely allyl methacrylate and ethylene glycol dimethacrylate were used to produce unimodal microcapsule particle size distribution. The characterization of the microcapsules, including particle size and size distribution determination, morphology, and thermal properties was carried out. Mean particle size of microcapsules ranges from 0.22
μm to 1.05
μm. The contents of n-hexadecane in microcapsules are between 29.04% and 61.42% and the melting enthalpies for these ratios are 68.89
J/g and 145.61
J/g, respectively. Prepared microcapsules using ethylene glycol dimethacrylate cross-linker were added to woven fabrics by a conventional pad-cure method to develop textile materials with heat storage property. The enthalpies of microencapsulated PCMs treated fabrics varied between 3.14
J/g and 10.02
J/g for various fabric samples.
Today, increasing dyes pollution is of great importance for life. Leaving the dyes used in industries such as textiles without being discharged pollutes other water sources. In order to prevent this, ...different methods are used in the literature. In this study, SrAl
2
B
2
O
7
, a borate metal, was used to remove methyl blue (MB), an anionic dye, by batch adsorption method. Strontium aluminoborate (SrAl
2
B
2
O
7
) was prepared using a solution combustion method at 950 °C for 4 h in air. The prepared adsorbent was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The particle morphology of the adsorbent was investigated using scanning electron microscope (SEM). By using N
2
adsorption-desorption, the Brunnauer, Emmet, and Teller (BET) specific surface area was found to be 1.9578 m
2
g
−1
. The surface charge of the dye-adsorbed SrAl
2
B
2
O
7
was determined based on zeta-potential measurements. Langmuir (R
2
=0.9897), Freundlich (R
2
=0.985), Dubinin & Radushkevic (R
2
=0.976), Scatchard (R
2
=0.881), Temkin & Pyzhev (R
2
=0.978) isotherms were calculated in the study. SrAl
2
B
2
O
7
showed good adsorption performance for methyl blue (MB) with maximum adsorption capacities of 29.069 mg g
−1
(Langmuir). Adsorption processes were also studied in detail. Thermodynamic and kinetic models; pseudo-first-order (R
2
=0.415), pseudo-second-order (R
2
=0.999), Elovich (R
2
=0.968) showed that adsorption using SrAl
2
B
2
O
7
in MB removal is endothermic and pseudo-second order.
This study focused on the preparation, characterization, and determination of thermal properties of microencapsulated n-hexadecane with poly(butyl acrylate) (PBA) to be used in textiles with heat ...storage property. Microcapsules were synthesized by emulsion polymerization method, and the particle size, particle size distribution, shape, and thermal storage/release properties of the synthesized microcapsules were analyzed using Fourier-transform infrared spectroscopy, scanning electron microscopy, and differential scanning calorimetry techniques. Allyl methacrylate, ethylene glycol dimethacrylate, and glycidyl methacrylate were used as cross-linkers to produce unimodal particle size distribution. MicroPBA microcapsules produced using allyl methacrylate cross-linker were applied to 100% cotton and 50/50% cotton/polyester blend fabrics by pad-cure method. The mean particle size of microcapsules ranges from 0.47 to 4.25 μm. Differential scanning calorimetry analysis indicated that hexadecane in the microcapsules melts at nearly 17°C and crystallizes at around 15°C. The contents of n-hexadecane of different PBA microcapsules were in the range of 27.7-50.7%, and the melting enthalpies for these ratios were between 65.67 and 120.16 J/g, respectively. The particle size and thermal properties of microcapsules changed depending on the cross-linker type. The cotton and 50/50% cotton/polyester blend fabrics stored 6.56 and 28.59 J/g thermal energy, respectively. The results indicated that PBA microcapsules have the potential to be used as a solid-state thermal energy storage material in fabrics.
Today, the importance of materials produced by natural means or by synthesis is increasing in the prevention of increasing water pollution. Sophora Japonica fruit seeds (SJfs) were pyrolyzed at 450 ...°C to produce SJfs-biochar (SJfsB) in this study. Iron nanoparticles were immobilized to the SJfsB structure to form a more active biosorbent matrix. SJfsB and the resulting novel biosorbent (nanomagnetic-Sophora Japonica fruit seeds biochar (nM-SJfsB) were used to remove malachite green (MG) from an aqueous solution. Fourier transform infrared analysis (FTIR) and scanning electron microscopy were used to elucidate the details of the biosorbent properties. The effect on removal was investigated using various parameters. A combined strategy was used to define the adsorption parameters such as adsorbent amount, time, initial dye concentration, pH, and temperature. The maximum adsorption capacity determined by the Langmuir model was 51.020 mg/g for SJfsB-MG and 101.010 mg/g was found for nM-SJfsB-MG. The pseudo second order equation made the equilibrium data suitable. After regeneration, nM-SJfsB can be used for re-adsorption studies and reused for multiple cycles in adsorption and desorption applications without discharging nano-iron particles into aqueous medium.
Batch sorption experiments were performed to investigate the potential of Bauhinia variagata fruit (BVf) and nano-magnetic Bauhinia variagata fruit (nM-BVf) to remove methylene blue (MB) and ...malachite green (MG). Equilibrium studies have been carried out using various experimental parameters such as the amount of biosorbent, initial solution concentration, contact time, pH, and temperature. The Langmuir, Freundlich, Scatchard, D-R and Temkin adsorption models were applied for the experimental information of MB and MG. The Freundlich model fits better than the Langmuir model. Freundlich model confirmed the magnificent dye sorption ability; 19.3 mg/g for BVf/MB, 21.2 mg/g for nM-BVf/MB, 19.7 mg/g for BVf/MG, and 30.1 mg/g for nM-BVf/MG. The pseudo-second-order kinetic model displayed a more suitable behavior to the experimental result for the removal of MG and MB. Thermodynamic parameters such as changes in Gibbs free energy (ΔG
o
), enthalpy (ΔH
o
), and entropy (ΔS
o
) were investigated and the fine details in the adsorption system were completed. The conclusion from this study is that the prepared nano biosorbent can be efficient for the removal of cationic dyes from wastewater.
Novelty statement
This novel biodegradable biosorbent (nanomagnetic-Bauhinia variagata fruits (nM-Vf)) has many different functional groups to bind methylene blue (MB) and malachite green (MG) from aqueous solution. The method to introducing magnetic form is well defined and provided an astronomically enormous capacity for the sorption of the dyes. It has a great capacity to adsorb dyes compared to other biosorbents applied by a different researcher. This nano-magnetic form of the biosorbent can be easily applied to wastewater system and has a lower price. Since it is a starter and a new biosorbent applied in the literature, it can be cited by a sizable number of researchers when published. The young researcher is trying to develop a new magnetic biosorbent for seperation techniques. Hence, this new biosorbent can be referenced by them as it is to prepare and apply for laboratory work.
Dyes are frequently used in industries such as textile, leather, paper and printing, to water sources causes harmful effects on the environment and human health. Therefore, it is crucial to ...effectively remove colored contaminants from water in order to protect the environment and public health, maintain biodiversity and preserve the esthetic aspects of water resources. In this study, wood chips obtained from Pinus brutia (PB) tree grown in many parts of the world were turned into biochar and then modified and used for the removal of malachite green, a cationic dye. For this purpose, biochar (PBB) was made by collecting PB wood and turning it into chips (PB). Later, PBB was modified to gain nano-magnetic properties. The structure of the obtained PBB and nM-PBB adsorbents was characterized by FT-IR. pH (2-9), temperature (25 °C-55 °C), time change (15 min-240 min), adsorbent amount change (0.05 g-0.45g) and MG concentration (25 mg/L-250 mg/L) were investigated in MG removal of PBB and nM-PBB. The process was found to be pseudo-second-order and spontaneous endothermic reaction. PBB and nM-PBB were found to be suitable for Langmuir isotherm in MG removal (q
max
=13.004 mg/g for PBB, q
max
=18.215 mg/g for nM-PBB).
Various adsorbents are used to remove different substances from water. The use of pinus brutia tree, which is a biochar product, in the removal of malachite green dyes from aqueous solutions has not been found in the literature. The findings revealed that Pinus brutia could be used to extract malachite green, a cationic dyestuff. Pinus brutia is a widely distributed, easy-to-access, low-cost species with many uses. Our study, in which Pinus brutian is used as an adsorbent, will contribute to the literature in this respect, and its use in the removal of different anionic and cationic dyes will be discussed in the future.
