Membranes made of carbon nanotubes and cellulose acetate with polyacrylic acid were designed in order to study their properties applicability for chromium removal. The membranes prepared by phase inversion method using acid. Carbon added the membrane during process synthesis proportions 1% weight. pores material are formed layers, giving effect depth forming a network. Both characterized IR, Raman, SEM spectroscopy. In addition, concentration acidic basic sites surface charge materials...

In the last years, organic acids have taken importance on diverse industrial applications. Various studies place, where use of such substances is proposed as replace inorganic acids, sulfuric acid, among others. Inorganic are generally aggressive compounds, whose production represents a high environmental impact. On other hand, less substances, which can be obtained from biomass. Thus, its associated to lower impact, with potential contribute implementation circular economy schemes....

The aim of this paper was to propose and test a continuous cobalt recovery process from waste mobile phone batteries. procedure started with dismantling, crushing, classifying the materials. A study on leaching sulfuric acid hydrogen peroxide carried out subsequent selective separation by means liquid–liquid extraction. best extraction conditions were determined based sequence experiments that consisted selecting extractant for cobalt, then assessing impact concentration, pH, contact time...

Abstract Biobutanol is a biofuel with potential to substitute gasoline. It can be generated through fermentation of lignocellulosic material, by which acetone, butanol, and ethanol (ABE) are obtained subsequently separated. Nevertheless, the blend ethanol/butanol itself fuel, so its separation could not even necessary. An alternative proposed simplify purification step ABE mixture, avoiding blend. Intensification alternatives suggested for resulting structure. The schemes optimized...

Abstract This paper deals with the solvent extraction of silver from thiourea leaching Ag ore liquors as an alternative to traditional process involving cyanide. The investigation mechanism acidic solution had not been clearly established date. behavior using di(2‐ethylhexyl)dithiophosphoric acid (D2EHDTPA) and di(2,4,4‐trimethylpentyl) thiophosphinic (CYANEX 302) was studied. effect various parameters such concentrations metal, mineral acid, thiourea, extractant has investigated. extracted...

Electronic waste recycling is a strategy that contributes to implement circular economy model which include reuse, component and raw material recovery minimum final deposition. Given the importance of reincorporating components electronic devices into productive chain correct for some hazardous metals such as lead contained in residues. This study focused on effect maximum available content (MAC) metal, sulfuric acid initial concentration, agitation velocity, oxidising agent copper, iron...

Button cell batteries are used in clocks, thermometers, remote controls, toys and other devices, they usually discarded the trash once its useful life is over. Some models of these contain silver oxide. In this paper we propose liquid-liquid extraction as separation process to recover metal. First, determination performed different leaching with nitric acid carried out. Affinity study done between several commercial extractants for silver. The best performing extractant bis(2-ethylhexyl)...

Mobile phones represent a significant and growing problem with respect to electrical waste electronic equipment (WEEE). Nevertheless, they are perhaps one of the most valuable products, since an important resource for recovery metals in terms mass volume. In this research chemical recycling mobile by solvolysis was investigated. The processing performed comminution hammer mill followed screening obtain mesh-4 sized flakes. Flakes were subjected solvolysis. Different reaction conditions...

Abstract Bioethanol has been identified as a renewable product with high potential for application biofuel. On the other hand, volumes of agri‐food residues are generated daily. Such have raw materials industrial bioethanol production. There is significant advance in synthesis biofuels from fruit and vegetable residues; however, most studies focused on conversion single type material, limiting routes. This work presents methodology to produce carrot broccoli their mixture; samples wastes...

Currently, with the rapid growth of population, demand for metals has increased, especially manufacture electronic devices such as cell phones, computer equipment, among others. Once these stop working, most are sent to landfills, which represents a danger since wastes contain and other materials that must be properly managed prevent them from having negative effect on environment human being. On hand, e-waste contains valuable copper, gold, silver, concentration in makes it cost-effective...

Los efluentes mineros contienen metales pesados y otros contaminantes que pueden dañar los ecosistemas acuáticos terrestres, además representan una pérdida económica, por el desperdicio de preciosos como la plata. Tradicionalmente, se ha utilizado adsorción con carbón activado para tratamiento estos efluentes. Sin embargo, uso hidrogeles (HG) resulta aún más rentable, ya materiales tienen un tiempo retención agua mayor, lo mejora su capacidad adsorción. En presente trabajo, sintetizaron...