An Experimental Study of Photocatalytic Degradation of Congo Red Using Polymer Nanocomposite Films

Eco-friendly polymer nanocomposite films were synthesized using biodegradable polymers of chitosan and polyvinyl alcohol as polymeric matrices and carbon black nanoparticles as the reinforcement. These films were applied to study their applicability to industrial wastewater purification as a photocatalyst for degradation of Congo red as a target pollutant and to study the effect of the polymeric matrix types of the films on their performance as a semiconductor photocatalyst. Fourier-transform infrared (FT-IR) spectra and X-ray diffraction (XRD) were used to characterize the films. Visible light photocatalytic degradation of Congo red as a pollutant under various operational conditions of pH, dye concentration, contact time, and light intensity was performed. Photocatalytic results revealed that the polymeric substrate type does not play a major role in the photodegradation of the dye, and the best operational conditions were at a pH of 6 and a dye solution concentration of 8 mg/L

The Burden of Sickle Cell Disease in Saudi Arabia: A Single-Institution Large Retrospective Study

Amerah Bin Zuair, Sheikhah Aldossari, Rand Alhumaidi, Maha Alrabiah, Abdulmajeed Alshabanat Department of Internal Medicine, College of Medicine, King Saud University and King Saud University Medical City, Riyadh, Saudi ArabiaCorrespondence: Amerah Bin Zuair, Internal Medicine, King Saud University Medical City, Riyadh, Saudi Arabia, Tel +966558765609, Email [email protected]: Sickle cell disease (SCD) is a significant burden for patients and healthcare systems due to multiple factors, including high readmission rates. This study aimed to determine the general characteristics, etiology of admissions, annual admission rate, length of stay, and readmission rate of patients with SCD.Patients and Methods: This retrospective observational study included all adult patients with SCD admitted to the General Internal Medicine (GIM) unit between 2016 and 2021.Results: There were 160 patients (mean age, 31.08 ± 9.06 years; 51.25% female) with SCD included in this study. Most originated from southern Saudi Arabia (45.62%). The average annual number of emergency department (ED) visits was 4, and approximately 19% of patients had ≥ 3 annual admissions. The mean length of stay was 6 days. The readmission rates at 7, 30, 60, and 90 days were 8%, 24.5%, 13.6%, and 10.8%, respectively.Conclusion: SCD generates a significant economic burden on the Saudi society and the effects on the healthcare system and patients’ quality of life are evident in the high ED visits, readmission rates and prolonged hospitalization. Thereupon we advocate the implementation of sickle cell disease-specialized multidisciplinary clinics.Keywords: complications, readmission, quality of life, middle east, hemoglobinopath

Asthma and COPD Overlap Syndrome (ACOS): A Systematic Review and Meta Analysis

<div><p>Background</p><p>The combination of asthma and chronic obstructive pulmonary disease (COPD), or ACOS is a recently defined syndrome. The epidemiology of the condition is poorly described and previous research has suggested ACOS is associated with worse outcomes than either condition alone. We therefore decided to complete a systematic review of the published literature.</p><p>Methods</p><p>This review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta- Analyses guidelines. A structured search was performed in the PubMed, Embase, and Medline databases up to Feb 2015 to identify studies reporting incidence, prevalence, health care utilization, morbidity, or mortality in COPD and asthma.</p><p>Results</p><p>A total of 19 studies were included in the present study. The pooled prevalence of overlap among COPD was 27% (95% CI: 0.16–0.38, p<0.0001) and 28% (95% CI: 0.09–0.47, p = 0.0032) in the population and hospital-based studies, respectively. We found no significant difference between ACOS and COPD in terms of gender, smoking status, lung function and 6mWD. However, in comparison to subject with only COPD, ACOS subjects were significantly younger, had higher BMI, healthcare utilization, and lower HRQoL.</p><p>Conclusion</p><p>ACOS is a common condition that exists in a substantial proportion of subjects with COPD. ACOS represents a distinct clinical phenotype with more frequent exacerbations, hospitalization, worse health-related quality of life, and higher healthcare costs than either disease alone. There is a critical need to better define the management and treatment of this syndrome.</p></div

Forest Plot: polled prevalence of overlap among COPD patients in population based studies.

<p>Study 1 = Shirtcliffe et al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref010" target="_blank">10</a>], study 2 = Menezes et al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref011" target="_blank">11</a>], study 3 = Marsh et al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref012" target="_blank">12</a>], study 4 = Johannessen et al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref016" target="_blank">16</a>], study 5 = Danielsson et al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref017" target="_blank">17</a>], study 6 = Methvin et al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref018" target="_blank">18</a>], study 7 = Miravitlles et al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref019" target="_blank">19</a>], study 8 = Y. Zhou+CESCOPD et al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref020" target="_blank">20</a>], study 9 = Jyrki-Tapani al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref021" target="_blank">21</a>].</p

Characteristics of included studies.

<p>Abbreviations and definitions: COPD = chronic obstructive pulmonary disease; FEV1 = forced expiratory volume in 1 second; FVC = forced vital capacity, ICD: International Classification of Diseases.</p><p>Characteristics of included studies.</p

Review process (PRISMA Flow Diagram): details of review process.

<p>Review process (PRISMA Flow Diagram): details of review process.</p

Forest Plot: polled prevalence of overlap among COPD patients in hospital based studies.

<p>Study 1 = Kauppi et al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref013" target="_blank">13</a>], study 2 = Hardin et al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref014" target="_blank">14</a>], study 3 = Alonso JL et al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref015" target="_blank">15</a>], study 4 = Fabbri et al [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136065#pone.0136065.ref022" target="_blank">22</a>].</p

Biosynthesis Effect of Egg White on Formation and Characteristics of NiO/NiCo₂O₄ Nanocomposites

For the successful production of NiO/NiCo2O4 nanocomposites, the environmentally friendly method of egg white supplementation has been used. Several analytical techniques were employed to characterize the morphology, purity, and crystal structure of the as-prepared nanocomposites. These techniques included transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The physical adsorption and magnetic properties of the investigated composite were determined using the Brunauer–Emmett–Teller (BET) method and a vibrating-sample magnetometer (VSM), respectively. The results have shown that the as-prepared composite particles had diameters of about 10–25 nm, with uniform distribution. The XRD analysis showed that the as-synthesized composites consisted entirely of cubic structures of both NiO and spinel NiCo2O4 nanoparticles, with a space group of Fd3m. The FTIR analysis showed characteristic vibration modes related to metal oxides, confirming the formation of composites containing NiO and NiCo2O4 crystallites. The investigated composites’ saturation magnetization (MS) and coercivity (HC) were easily controllable because of the ingredients’ ferromagnetic (NiCo2O4) and antiferromagnetic (NiO) characteristics. The excellent combination of the NiO/NiCo2O4 nanocomposites’ properties is anticipated to make this system suitable for a wide range of applications

Synthesis of PS/RB-Cs and its use in the treatment of water polluted with heavy metals

Polystyrene waste are non-biodegradable materials that causes harm to the environment. Red brick waste resulting from demolition and reconstruction are an obstacle to its disposal. To solve this problem and meet modern sustainability standards, this study utilized polystyrene (PS) foam and red brick construction waste to prepare composite materials (PS/RB-Cs) as a new efficient adsorbent. The PS/RB-Cs composite as an adsorbent was characterized using a UV–Vis Spectrophotometer, Energy Dispersive X-ray Spectroscopy (EDX), Scanning Electron Microscope (SEM), and transmission electron microscopy (TEM), which showed a clear spectrum shift after using PS/RB-Cs as an adsorbent. The PS/RB-Cs was characterized by a porous structure with higher surface area and high stability. The efficiency of the PS/RB-Cs in treating water contaminated with heavy metals such as cobalt and nickel was verified under different initial concentrations, temperatures, doses, pH, and contact times. The experimental qe values were consistent with the qe calculated values and were approximately 8 mg/g. The adsorption isotherm models showed that the adsorption results fit the Langmuir, Freundlich and Flory-Huggins isotherm models and that the process was favorable. By applying pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetic models, the adsorption process was found to follow PSO. The findings of this research validated that the composite material that was prepared serves as a potent adsorbent for the treatment of water that has been polluted by heavy metals

Adsorption behaviors of crystal violet from aqueous solution using Anatolian black pine (Pinus nigra Arnold.): kinetic and equilibrium studies

In this study, Anatolian black pine (ABP, Pinus nigra Arnold.) was evaluated as biosorbent for removal of crystal violet (CV) from aqueous solution. The influence of operational parameters including solution pH, initial CV concentration, biosorbent dosage, contact time, and temperature were studied in batch systems. The adsorption data followed well Langmuir isotherm with a maximum biosorption capacity of 12.36 mg/g. The equilibrium data were better fitted with pseudo-second-order kinetic model (R2 ˃ 0.99). Moreover, the thermodynamic parameters indicated that the CV biosorption was feasible, spontaneous, and endothermic process. This study showed that ABP (Pinus nigra Arnold.) can be used to remove CV from aqueous solutions. © 2019, © 2019 Taylor & Francis Group, LLC