Papel de Colgadura, Vol. 14

Contiene : Bienes íntimos: releyendo historias de familia y poder, Watkins, Sarah E. -- Soflan is a weapon of mass destruction, Buchely Ibarra, Lina Fernanda -- Horneando pan en fogón de leña, Vergara Figueroa, Aurora -- Pensamientos desde el cuarto al lado de la cosina, Sierra Arango, Sergio Alberto -- De brujas e ismos, Cuéllar Barona, Margarita Leonor -- Puertas pa´ fuera, Cadavid Valencia, Claudia -- Miedo y cuerpo, Granados Barco , Adriana -- ¿Quién dijo que esta ciudad es para todas?, Garay , Ana -- Mis días en el sauna -- Es cuestión de ser un gallo fino, López Herazo, Luis Alfredo -- El compadrazgo colombiano : ¿la otra sociedad de los Caballeros del Anillo?, Ortega, Alexander -- Bordando para no olvidar, Cardona Londoño, Nicolás -- Pensamientos acerca de la construcción de la masculinidad, Paz Serrano, Juan José -- Círculo de hombres de Cali, Pinto Alvarado, Natalio -- Los signos : el médico y el arte de la lectura del cuerpo, Lozano Sánchez, Esthepanía -- Señor ego -- De la belleza un corsé. Del dolor, ellas -- Cachetes de marrana flaca, Montoya Robledo, Valentina -- Las palabras, el estado y el amor, Solano Gómez, Diana Marcela -- Celebrar con moderación, Valero L., Andrés -- Cómo ser mujer : Caitlin Moran, Unás Camelo, Viviam Stella -- Gabriela Castellanos y su novela Jalisco, Navia, Carmiña -- En diciembre llegaban las brisas, Ruíz Navarro, Catalina -- Vida hogareña, Cuéllar Barona, Margarita Leonor -- La guerra no tiene rostro de mujer, Ibarra Melo, María Eugenia -- Sarah Kane o el paso obligado de la explosión violenta a la reflexión interior, Ariza, María del Mar -- Notches,Necochea López, Raúl

Optimization of adsorptive removal of α-toluic acid by CaO2 nanoparticles using response surface methodology

The present work addresses the optimization of process parameters for adsorptive removal of α-toluic acid by calcium peroxide (CaO2) nanoparticles using response surface methodology (RSM). CaO2 nanoparticles were synthesized by chemical precipitation method and confirmed by Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) analysis which shows the CaO2 nanoparticles size range of 5–15 nm. A series of batch adsorption experiments were performed using CaO2 nanoparticles to remove α-toluic acid from the aqueous solution. Further, an experimental based central composite design (CCD) was developed to study the interactive effect of CaO2 adsorbent dosage, initial concentration of α-toluic acid, and contact time on α-toluic acid removal efficiency (response) and optimization of the process. Analysis of variance (ANOVA) was performed to determine the significance of the individual and the interactive effects of variables on the response. The model predicted response showed a good agreement with the experimental response, and the coefficient of determination, (R2) was 0.92. Among the variables, the interactive effect of adsorbent dosage and the initial α-toluic acid concentration was found to have more influence on the response than the contact time. Numerical optimization of process by RSM showed the optimal adsorbent dosage, initial concentration of α-toluic acid, and contact time as 0.03 g, 7.06 g/L, and 34 min respectively. The predicted removal efficiency was 99.50%. The experiments performed under these conditions showed α-toluic acid removal efficiency up to 98.05%, which confirmed the adequacy of the model prediction