Journal of Applied Chemical Research
Volume:16 Issue: 1, Winter 2022

The present study delineates the applicability of polysulfone/ X% Fe2O3 mixed matrix membranes as a low-cost and non-toxic natural adsorbent.  It was used to  remove humic acids (HAs)  rapidly from aqueous solutions. The polysulfone/ X% Fe2O3 mixed matrix membranes were characterized by BET, FT-IR, XRD, and SEM. The humic acids (HAs) removal by the developed adsorbent was investigated  using  the batch  adsorption  technique  and  all  parameters  influencing  the  removal efficiency such as dose of adsorbent and pH were considered. The optimal conditions for the humic acids (HAs) removal were found to be 5, 120-160 min, 10 mg/L, and 0.1 g for pH, contact time and adsorbent dosage respectively. The rapid adsorption of the humic acids (HAs) is an advantage of this adsorbent. The adsorption capacity of humic acids (HAs) onto polysulfone/ X% Fe2O3 mixed matrix membrane was reasonably constant in the pH range of 5–7 but decreased as the pH exceeded 5. Various isotherm models  were  used to  fit  the  experimental  equilibrium  data. Equilibrium  data obtained  have  been  fitted  to  the Langmuir,  Freundlich,  and  Dubinin–Radushkevich adsorption isotherms. Langmuir's model best fits the experimental results. Kinetic modeling showed that the pseudo-second-order equation was the most appropriate for the description of humic acids (HAs) for  PSF,  PSF/5%  Fe2O3, and PSF/10%  Fe2O3 mixed  matrix  membrane were  found  to  be  13.333, 10.309, and  7.874  mg/g,  respectively.  The  overall  results  confirmed  that polysulfone/  X%  Fe2O3 mixed matrix membrane could be a promising adsorbent material for humic acids (HAs) removal from aqueous solutions.

Megestrol drug is a synthetic steroid progesterone, and it is used as an anti-plasma agent to treat advanced  breast  cancer  or  endometriosis. In  this  study,  for  determination  of  megestrol  drug  in solution using kinetic spectrophotometric method, we prepared a solution of Origanum majoranacapped AgNPs utilizing sodium borohydride as a stabilizer sensor. The calibration curve was linear in the range of (0.01 to 10.0 µg L−1). The standard deviation of (1.8%), and detection limit of the method (0.023 µg L−1 in time 8 min, 345 nm) were obtained for Sensor level response Origanum majorana-capped AgNPs with (95%) confidence evaluated. The observed outcomes confirmed the suitability recovery and a very low detection limit for measuring the megestrol drug. The method introduced to measure megestrol drug in real samples such as urine and blood was used and can be used for other drugs and hospital samples.

An efficient and green protocol for synthesis of title compounds has been achieved via a one pot, three component reaction of 4-hydroxycoumarin or 4-hydroxy-6-methylpyran-1-one, aryl glyoxals and amides in choline chloride/oxalic acid as a deep eutectic solvent (DES) has been described. The DES  system  offers  advantages  in  terms  of  environmentally  benign,  biodegradable,  short  reaction times, high yield and the use of safe and inexpensive components. DES can be easily recovered and can be reused for other runs without any reduction in the activity.

In  this  research,  a  series  of  new  poly(ether  sulfone)  derivatives  were  prepared  by the direct condensation of 4,4'-(arylpyridine-2,6-diyl)diphenols with bis(fluorophenyl)sulfone in the presence of K2CO3 in DMSO/toluene at 180°C. The synthetic polymers show good solubility in polar aprotic solvents,  such  as  DMSO,  NMP,  DMF,  as  well  as  in  THF.  The  resulting  gel  permeation chromatography  (GPC)  analysis  of poly (ether sulfones) indicates  moderate  molecular  weights (Mw) in the range of 1625-4185 g/mol. Using differential scanning calorimetry, the glass transition temperatures  of  the  poly (ether sulfones) were  determined  to  be within  the  range of 157–181°C. Thermogravimetric analysis data for these polymers showed the 10% weight loss temperatures to be within the range of 177–377°C. The char yields of the polymers at 600°C ranged from about 43–62%. This method provides a simple polymerization process for the convenient preparation of poly(ether sulfones).

Graphene oxide/polydopamine-polyacrylamide nanocomposite was synthesized by a simple method and  used  as  adsorbent for  dispersive  micro-solid-phase  extraction of phenobarbital  in  plasma samples.  The adsorbent  was  characterized  by  Fourier-transform  infrared  spectroscopy,  X-ray diffraction, scanning electron microscopy–energy dispersive spectroscopy and thermal gravimetric analysis. The  results show  that functionalization of graphene  oxide  by  polymeric  materials  can enhance  the  sorption  properties  and  thermal  stability  of the  prepared  adsorbent.  Influential parameters on  the extraction  efficiency  of Phenobarbital  including  adsorbent  amount,  elution solvent and its volume, sorption and desorption times and pH of sample solution were investigated and optimized. Under the optimized conditions, limits of detection and quantitation values were 1.4 and 5ng/mL, respectively. Relative recovery data for several real samples were obtained within the range of 84.0-98.0% with a relative standard deviation less than 7.2%. The proposed method was successfully applied to quantitative determination of phenobarbital in plasma samples.

This  study  describes  the  construction of  a  new  electrochemical  sensor  and  applies  it  for  the determination  of  Hg2+ ion.  This  sensor  was  prepared  using  new  nanographene  on  G-C3N4 nanosheets.  Although  the  other  methods  (gas  or  liquid  chromatographic,  electrophoresis,  flow injection) for measuring Hg2+ ion have advantages such as excellent accuracy and reproducibility, it has  limitations  such  as  long-time  measure,  high  equipment  cost.  Here,  we  report  the  use  of  an electrochemical approach for analytical determination of Hg2+ ion that takes 120 s. The calibration curve was linear in the range of (0.03 to 33.0 nM). The current response was linearly proportional to the Hg2+ion concentration with a R2~ 0.999. We demonstrated a sensitivity a limit of detection of (0.093  nM).  Finally,  Sensor  nanosheets  G-C3N4/CPE  has  been  successfully  applied  for  the determination of Hg2+ ion in different kind of water samples. The method introduced to measure Hg2+ ion in real samples such as water samples was used and can be used for other samples.