Phosphate recovery from aqueous phase using novel zirconium-based adsorbent.

This study aims to document the phosphate ion (PO43-) adsorption capacity of a novel zirconium-based adsorbent. The physicochemical properties of the adsorbent are investigated using an array of methods and metrics such as electron microscopy, X-ray diffraction, thermal analysis, specific surface area, pore volume, pH point of zero charge (pHpzc), and surface hydroxyl groups. The batch method is used to elucidate PO43- adsorption capacity. Results suggested that the adsorption of PO43- was based on an internal diffusion and a monolayer adsorption. We also clarified that the pH of the solution significantly impacted the adsorption. Moreover, the adsorbent shows the ability to not only adsorb but also desorb PO43- for at least five cycles, based on an adsorption mechanism that we document. These findings indicate that this adsorbent could serve as a major industrial PO43- adsorbent.

Effect of Concomitant Drugs on Sodium Zirconium Cyclosilicate Hydrate in Artificial Intestinal Juice.

To explore drug interactions involving sodium zirconium cyclosilicate hydrate (SZC) and concomitant drugs like calcium antagonists (amlodipine and nifedipine) and ß-blockers (carvedilol and bisoprolol), we investigate how these concomitant drugs influenced the administration of SZC in an artificial intestinal juice. Initially, we assessed the potassium ion adsorption capacity, ranking it as follows: calcium polystyrene sulfonate (CPS, 54.9 mg/g) < sodium polystyrene sulfonate (SPS, 62.1 mg/g) < SZC (90.8 mg/g). However, the adsorption equilibrium was achieved in the order of CPS ≒ SPS (within 1 min) < SZC (within 1 h). Subsequently, we determined the residual percentages of amlodipine, nifedipine, carvedilol, and bisoprolol, finding them to be 79.0-91.9% for SZC, 0.38-38.4% for SPS, and 0.57-29.0% for CPS. These results suggest the efficacy of SZC in managing hyperkalemia alongside concomitant drugs in an artificial intestinal juice, with particular emphasis on amlodipine (calcium antagonist) and carvedilol (ß-blocker). Additionally, we identified the presence of carbon, nitrogen, and oxygen components from both drugs on the SZC surface following interaction. We also evaluated how amlodipine, nifedipine, carvedilol, and bisoprolol affected the administration of SZC in the presence of potassium ions. Our results indicate that potassium ions and concomitant drugs did not interfere with each other in the artificial intestinal juice. These results offer valuable insights into the administration of SZC in conjunction with concomitant drugs. Lastly, the presented data shows qualitative results in this study.

Potential Interaction between Sodium Polystyrene Sulfonate and Prescription Drugs in Artificial Intestinal Juice.

This study evaluated the interaction between sodium polystyrene sulfonate (SPS) and several commonly used concomitant drugs, such as carvedilol, bisoprolol, imidapril, atorvastatin and azilsartan. The residual rate of adsorption 6 h after starting the experiment followed the order carvedilol (0.36%) < bisoprolol (19.7%) < imidapril (81.2%) < atorvastatin (86.5%) < azilsartan (87.9%) in artificial intestinal juice (pH 6.8). In addition, the pKa of carvedilol and bisoprolol was 8.0 and 9.6 and that of atorvastatin, azilsartan, and imidapril was 4.5, 6.1, and 2.4, respectively. These results indicate that the form (ionic or uncharged) of each drug is important to its reaction with SPS. Moreover, we demonstrated the effect of potassium ions (concentration of 1000 or 2000 mg/L) on the adsorption of concomitant drugs onto SPS in artificial intestinal juice. Our results show that the residual rate of adsorption of carvedilol and bisoprolol increases with increasing concentration of potassium ions whereas adsorption of potassium ions onto SPS was unaffected by carvedilol and bisoprolol under our experimental conditions. Finally, the obtained results revealed that interactions between SPS and carvedilol or bisoprolol readily occur in artificial intestinal juice.

Potential of waste mangosteen shell in the removal of cadmium ions: Effects of pH, contact time, and temperature.

In this study, waste biomass adsorbents produced from mangosteen shells (MGS) were prepared (denoted as MGS500 and MGS1000). The physical and chemical characteristics, such as scanning electron microscopy, thermogravimetric-differential thermal analysis, specific surface area, pore volumes, surface functional groups, and point of zero charge of the prepared MGS samples were determined, and the adsorption capacity of cadmium ions from aqueous media was assessed. The effects of pH, adsorption time, temperature, and coexistence on adsorption were carefully assessed using an inductively coupled plasma optical emission spectrometer under several experimental conditions. The adsorption capacity decreased in the order, MGS < MGS500 < MGS1000. The optimal pH for cadmium ion removal was 5.0. The amount of cadmium ions adsorbed gradually increased with time, and adsorption equilibrium was achieved within 24 h after adsorption. Additionally, the amount of adsorbed cadmium ions increased with increasing adsorption temperature. To elucidate the adsorption mechanism in detail, the elemental distribution and X-ray photoelectron spectra of the prepared adsorbents were analyzed. Finally, desorption solutions such as HNO3, H2O, and NaOH were used to desorb the absorbed cadmium ions from MGS1000. Under our experimental conditions, the desorption percentage of cadmium ions was approximately 98.8% using HNO3. In conclusion, MGS1000 exhibited a good adsorption capacity of 12.0 mg/g for adsorbing cadmium ions from aqueous media and desorption capacity with HNO3 at 1000 mmol/L.

Fundamental Investigation of Adsorption Behavior onto Sodium Polystyrene Sulfonate to Potassium Ions and Its Concomitant Drugs in the Digestive Tract.

To verify the interaction between sodium polystyrene sulfonate (SPS) and its concomitant drugs, we elucidated the capability of potassium ions and concomitant drugs to adsorb onto SPS and the effect of their coexistence on the amount adsorbed. We identified 14 drugs used concomitantly with SPS from 2017-2019 in our investigation, and 5 drug preparations used in the clinical setting were used for the experiments. In the artificial intestinal juice, SPS adsorbed 39.05-69.77 mEq/g of potassium ions. Amlodipine besylate and nifedipine were well-adsorbed, while azosemide and febuxostat were did not adsorb well onto SPS. Our results and the results of a previous study suggest that additives in drug preparations affect the adsorption of drugs onto SPS. The adsorption kinetics onto SPS of drugs conformed to the pseudo-second order model. However, the adsorption of amlodipine besylate completely may not be fitted to the pseudo-second order model. The amount of amlodipine besylate adsorbed under the coexistence of potassium ions decreased compared to when potassium ions were absent. The amount of nifedipine and potassium ions adsorbed remained constant, regardless of whether potassium ions were present or not. These results might be due to the differences in their mechanisms of adsorption onto SPS and to the characteristics of the drugs. In a clinical setting, SPS is used concomitantly with various oral drugs. The interaction between SPS and its other concomitant drugs need to be elucidated more to obtain enough evidence for pharmacists to propose the appropriate prescription.

Granulation of Nickel-Aluminum-Zirconium Complex Hydroxide Using Colloidal Silica for Adsorption of Chromium(VI) Ions from the Liquid Phase.

We combined a nickel-aluminum-zirconium complex hydroxide (NAZ) with colloidal silica as a binder to prepare a granulated agent for adsorbing heavy metals from aqueous media. Three samples with different particle diameters were prepared to evaluate the effects on the properties: small (NAZ-S), medium (NAZ-M), and large (NAZ-L). We confirmed the granulation of the prepared samples at a binder content of 25%. NAZ-S had the largest specific surface area and number of hydroxyl groups, followed by NAZ-M and then NAZ-L. Regarding the adsorption capacity, NAZ-S adsorbed the most chromium(VI) ions followed by NAZ-M and then NAZ-L. The binding energy of Cr(2p) at 575-577 eV was detected after adsorption, and the effects of the temperature, contact time, and pH on the adsorption of chromium(VI) ions were evaluated. We identified the following adsorption mechanism: ion exchange with sulfate ions in the interlayer region of the NAZ samples. Finally, the chromium(VI) ions adsorbed by the NAZ samples were easily desorbed using a desorption solution. The results showed that NAZ offers great potential for the removal of chromium(VI) ions from aqueous solutions.

In vitro removal of paraquat and diquat from aqueous media using raw and calcined basil seed.

Raw and calcined basil seeds (BS and BS1000, respectively) were evaluated for their ability to remove herbicides such as paraquat and diquat. The physicochemical properties of BS and BS1000 were determined and the effects of contact time and initial concentration on paraquat and diquat adsorption were assessed. After calcination treatment, the number of pores in BS increased, and the specific surface area was increased from 0.265 to 86.902 m2 g-1. The quantity of herbicides adsorbed using BS1000 was greater than that using either BS or medicinal-grade carbon. Additionally, the adsorption quantity increased with the increase in contact time and initial concentration of herbicide. Therefore, BS1000 is a potential resource for the removal of herbicides. Moreover, BS and BS1000 exhibited the capacity for herbicide adsorption in simulated intestinal fluid.

Adsorption Performance on As(III) from Aqueous Solution Using the Complex Nickel-Aluminum Hydroxides.

In this study, complex nickel-aluminum hydroxides were prepared at different molar ratios (NA12, NA11, NA21, NA31, and NA41), and their adsorption capability on arsenic ions (As(III)) from aqueous media was assessed. The physicochemical properties such as morphology, X-ray diffraction pattern, specific surface area, numbers of hydroxyl groups, and surface pH were investigated. In addition, the effect of contact time, temperature, and pH on the adsorption capability on As(III) was also evaluated. NA41 exerted the highest adsorption capability on As(III) comparable to other prepared adsorbents. However, the specific surface area and numbers of hydroxyl groups did not significantly affect the adsorption capability on As(III). The equilibrium adsorption of As(III) using NA41 was achieved within 24 h, and the obtained results corresponded to a pseudo-second-order model with correlation coefficient value of 0.980. Additionally, the adsorption isotherms were well described by both the Langmuir and Freundlich equations. The optimal pH condition for removal of As(III) using NA41 was found to be approximately 6-8. Finally, the adsorption mechanism of As(III) was assessed by analyzing the binding energy and elemental distribution, which indicated that the electrostatic interaction and ion exchange influenced the adsorption of As(III) under experimental conditions. These results demonstrated the potential candidate of NA41 as an effective adsorbent on As(III) removal from aqueous media.

[The Adsorption Capabilities of Methylene Blue Using Coconut Fibers in Order to Develop the Aquatic Environment].

To decrease the amount of waste biomass and develop a useful application. Coconut fiber (CF) was used to prepare a novel adsorbent to remove methylene blue (MB), which is a recalcitrant organic compound in the water environment. We were able to produce novel adsorbents such as CCF500 and CCF1000 by the calcination treatment of CF. The specific surface area and pore volume of CCF1000 were higher than those of CF or CCF500. Quantity of MB adsorbed was in the order; CCF5000.986). The adsorption mechanism of MB using CCF1000 was demonstrated in this study. The intensities of carbon (C), nitrogen (N), and sulfur (S) onto CCF1000 surface increased after adsorption of MB. In addition, the binding energies of nitrogen (1s) at approximately 400 eV and sulfur (2s and 2p) at approximately 165 and 230 eV which were generated after adsorption. Therefore, the adsorption of MB from aquatic solution was strongly involved with the physicochemical properties of CCF1000 surface. Our findings showed that CCF500 and CCF1000 could be produced from CF by calcination treatment, which demonstrates that the amount of waste biomass decreased. In particular, CCF1000 displays the capability to adsorb MB from aquatic solution. These results showed that CCF1000 could be a useful adsorbent for aquatic environment purification.

[Zeolite Produced from Fly Ash by Thermal Treatment in Alkaline Solution and Its Capability to Adsorb Cs(I) and Sr(II) in Aqueous Solution].

In this study, we evaluated the efficiency of fly ash (FA) recycling technology, produced from a coal-fired power plant, with the capability to adsorb cesium ion[Cs(I)] and strontium ion [Sr(II)] from aqueous phase. Zeolite was produced from FA by hydrothermal treatment in an alkaline solution. Zeolite 12, 24, and 48 have a Garronite structure. Moreover, the specific surface area of Zeolite was greater than that of FA. Zeolite 12 demonstrated the adsorption capability of Cs(I) and Sr(II) from aqueous phase. Adsorption isotherms data fitted both the Langmuir equation (correlation coefficient: >0.895) and the Freundlich equation (correlation coefficient: >0.881). In addition, the kinetic data fitted the pseudo-second-order model when compared to the pseudo-first-order model. Cs(I) and Sr(II) were selectively adsorbed by Zeolite 12 in complex solution system. Our findings indicate that Zeolite can be produced from FA by hydrothermal treatment in an alkaline solution and shows the capability to adsorb Cs(I) and Sr(II) from aqueous phase. Therefore, Zeolite can be useful adsorbent for purification in water environments.