Cintia K Rojas-Mayorga

Universidad de Colima · Faculty of Chemistry

Aquatic ecosystems worldwide are strongly influenced by the productive activities of a region. These activities can generate pollution by compounds with little-known or unknown characteristics and without regulation. Emerging contaminants are a group of compounds that have worldwide begun to be frequently detected in the environment, raising concer...

This paper analyzes the thermodynamics and interfacial interactions of the adsorption of fluorides and arsenates on pristine MIL-100(Fe) and MIL-101(Fe) structures. Experimental equilibrium studies showed that the fluoride adsorption was exothermic on both MOFs at 20 – 40 °C and pH 7, while the arsenate adsorption was endothermic at the same operat...

The adsorption of naproxen (NAP), diclofenac (DFC), and acetaminophen (APAP) molecules from aqueous solutions using MIL-100-Fe and MIL-101-Fe metal organic frameworks (MOFs) has been analyzed and modeled. Adsorption isotherms of these pharmaceuticals were experimentally quantified at 30 and 40°C and pH 7. Textural parameters and surface chemistry o...

The application of artificial neural networks on adsorption modeling has significantly increased during the last decades. These artificial intelligence models have been utilized to correlate and predict kinetics, isotherms, and breakthrough curves of a wide spectrum of adsorbents and adsorbates in the context of water purification. Artificial neura...

New activated carbons were prepared from coconut shell and tested to evaluate their adsorption properties to separate benzene and cyclohexane. A Taguchi experimental design was utilized to identify the best preparation conditions of the activated carbons based on their benzene adsorption capacities. Type and concentration of the chemical agent, rat...

Due to the sulfur dioxide (SO 2) negative effects to the environment and human health, its removal is currently of great importance to policy markers and researchers. In this context, the present work had the aim to study the SO 2 dynamic adsorption behavior on two activated carbons rich on calcium species. One material prepared directly from peach...

The objective of this work is to highlight the importance of the textural and functional groups present in the carbon surface for the adsorption process of basic, acid and reactive dyes through experimental and theoretical adsorption studies. The adsorption of dyes on activated carbon prepared from peach endocarp shell by simple carbonization (CP)...

Immersion calorimetry into liquids of different dimensions is a powerful tool to learn about the pore size and shape in nanoporous solids. In general, in the absence of specific interactions with the solid surface, the accessibility of the liquid probe molecule to the inner porosity, and the associated enthalpy value decreases with an increase in i...

Active carbons were synthesized from a furfural copolymer using a polyester resin as an activator. The influence of the temperature of the thermal treatment of the carbon sorbents on the weights and ash contents of the obtained materials was established. The molecular structures of the carbons were studied by NMR spectroscopy.

The VOC’s adsorption in dynamic systems using three different sorbents (carbonaceous materials) prepared from biomass residue as precursor, was studied. The sorbents were prepared from pecan nut shell (Carya illinoinensis), peach stone shell (Prunus persica) and sawdust (Pinus cembroides), using a L9 orthogonal array of Taguchi method to identify t...

This study reports the assessment of helical coil-packed bed columns for Zn adsorption on bone char. Zn adsorption breakthrough curves have been obtained using helical coil columns with different characteristics and a comparison has been conducted with respect to the results of straight fixed-bed columns. Results showed that the helical coil adsorp...

This paper evaluates the pyrolysis conditions applied during the synthesis of bovine bone char and the effect of these parameters in its adsorption properties for heavy metal removal at batch conditions. The synthesis route has been analyzed in detail and the surface interactions involved in the adsorption process has been studied and discussed usi...

This study reports the multicomponent adsorption of dye AB25, nickel (Ni2+) and zinc (Zn2+) ions on an activated carbon using binary mixtures of metal and dye, and packed bed columns at different operating conditions. Design parameters of packed bed adsorption columns have been calculated using the breakthrough curves and Thomas model, and an analy...

New bone chars for fluoride adsorption from drinking water have been synthetized via a metal doping using aluminum and iron salts. A detailed statistical analysis of the metal doping process using the signal-to-noise ratios from Taguchi’s experimental designs and its impact on the fluoride adsorption properties of modified bone chars have been perf...

In this study, the denim fiber scraps were reused as an alternative low-cost sorbent for the removal of heavy metals Pb2+, Cd2+, Zn2+ and arsenic from aqueous solutions. Results showed that this textile waste was an effective sorbent for the removal of these heavy metal ions and offered a better removal performance than those reported for other syn...

This study reports the optimization of pyrolysis process for the synthesis of bone char for fluoride removal from water. Specifically, we have performed a detailed analysis of the adsorption properties of bone char samples obtained at different operating conditions of pyrolysis. Results show that the pyrolysis temperature plays a major role to synt...

Batch experiments were performed to model kinetic and thermodynamic data for Cd and Ni biosorption by raw chicken feathers (CFs) under different conditions. Results indicated that Cd and Ni sorption onto CFs occurred on the external surface of the biosorbent. Ion removal increased with pH, whereas both endothermic and exothermic stages where observ...