30 documents found, page 1 of 3
Solar-driven thermo-photocatalytic CO2 methanation over a structured RuO2:TiO2/...
Paulista, Larissa Oliveira; Ferreira, Alexandre; Castanheira, Bruna; Ðolić, Maja B.; Martins, Ramiro; Boaventura, Rui; Vilar, Vítor J.P.A new hybrid catalyst composed of mesostructured silica SBA-15 functionalized with TiO2 and further loaded with RuO2 was developed to efficiently promote thermo-photocatalytic CO2 hydrogenation into methane at low temperatures. The catalytic activity was assessed with respect to TiO2:RuO2 loading, catalyst dosage, illumination source (polychromatic sunlight and monochromatic LEDs) and power, [H2]:[CO2] molar ra...
Solar thermo-photocatalytic methanation using a bifunctional RuO2:TiO2/Z13X pho...
Paulista, Larissa O.; Ferreira, Alexandre F.P.; Rodrigues, Alírio; Martins, Ramiro; Boaventura, Rui; Vilar, Vítor J.P.; Silva, Tânia F.C.V.A novel bifunctional photocatalyst/adsorbent material based on the RuO2:TiO2/zeolite 13X (Z13X) composite was developed to enhance solar-driven methanation through simultaneous carbon dioxide (CO2) capture and thermo-photoconversion. The activity/stability of the hybrid material towards methane (CH4) production was assessed by varying the (i) photocatalyst composition (Ru load and semiconductor type), (ii) bifu...
Ozone membrane contactor for tertiary treatment of urban wastewater: Chemical, ...
Presumido, Pedro Henrique; Ribeirinho-Soares, Sara; Montes, Rosa; Quintana, Jose B.; Rodil, Rosário; Ribeiro, Marta; Neuparth, Teresa; Santos, Miguel M.A membrane ozone contactor, operated under continuous mode, was applied to promote the tertiary treatment of urban wastewater (UWW), targeting the removal of contaminants of emerging concern (CECs), bacterial disinfection, and toxicity reduction. This system relies on the homogeneous radial distribution of ozone (O3) in the reaction zone by "titration" through a microfiltration borosilicate tubular membrane, wh...
Multistage treatment for olive mill wastewater: Assessing legal compliance and ...
Vuppala, Srikanth; Paulista, Larissa Oliveira; Morais, Daniela F.S.; Pinho, Inês L.; Martins, Ramiro; Gomes, Ana I.; Moreira, Francisca C.A treatment train for the remediation of a raw olive mill wastewater (OMW) was investigated, aiming to comply with the emission limit values (ELVs) for direct discharge into water bodies. The following stages were proposed: (i) pre-treatment (filtration and sedimentation), (ii) coagulation, (iii) biological oxidation, and (iv) advanced oxidation process (AOP). Under the best-operating conditions for coagulation...
A novel ceramic tubular membrane coated with a continuous graphene-TiO2 nanocom...
Presumido, Pedro Henrique; Santos, Lucrécio F. dos; Neuparth, Teresa; Santos, Miguel M.; Feliciano, Manuel; Primo, Ana; Garcia, HermenegildoThis work presents a ceramic tubular membrane coated with a continuous graphene-TiO2 nanocomposite thinfilm for contaminants of emerging concern (CECs) removal from synthetic and real matrices in single-pass flow-through operation. Microfiltration ceramic membranes were coated in situ with graphene (G)-TiO2-P25 nano-composite using two different methods: Membrane type A - TiO2-P25 incorporated in the G prepara...
Ozone membrane contactor to intensify gas/liquid mass transfer and contaminants...
Presumido, Pedro Henrique; Montes, Rosa; Quintana, Jose B.; Rodil, Rosário; Feliciano, Manuel; Li Puma, Gianluca; Gomes, Ana I.; Vilar, Vítor J.P.A tubular porous borosilicate membrane contactor was investigated for ozone gas/water mass transfer and the removal of contaminants of emerging concern (CECs) in water. Ozone gas/water contact occurs on the mem-brane shell-side, which is coated with a photocatalyst (TiO2-P25), as the ozone gas stream is fed from the lumen side and permeates through the pores generating micro-sized ozone bubbles uniformly delive...
Finding a suitable treatment solution for a leachate from a non-hazardous indus...
Barbosa Segundo, Inalmar D.; Martins, Ramiro; Boaventura, Rui; Silva, Tânia F.C.V.; Moreira, Francisca C.; Vilar, Vítor J.P.The current study aimed at tackling the lack of effective treatment solutions for leachates from industrial solid waste landfills (ISWLs) through the development of a treatment train for a non-hazardous ISWL (NHISWL) leachate with low/moderate content of organics and salts and low biodegradability. The following technologies were tested: (i) coagulation using ferric chloride (FeCl3) or aluminium sulphate (Al2(S...
Enhancing methane yield from crude glycerol anaerobic digestion by coupling wit...
Paulista, Larissa Oliveira; Boaventura, Rui; Vilar, Vítor J.P.; Pinheiro, Alexei; Martins, RamiroAnaerobic digestion of crude glycerol from biodiesel production is a feasible way for methane production. However, crude glycerol (CG) contains impurities, such as long-chain fatty acids (LCFA) that can inhibit methanogenic microorganisms. Ultrasound promotes the hydrolysis of LCFA and deagglomerates the microorganisms in biological flocs. Furthermore, Aspergillus niger and Escherichia coli produce lipases capa...
Valorização energética de glicerol bruto por digestão anaeróbica, pré tratament...
Paulista, Larissa Oliveira; Boaventura, Rui; Vilar, Vítor J.P.; Pinheiro, Alexei; Martins, RamiroA digestão anaeróbia do glicerol bruto proveniente da produção de biodiesel é uma alternativa que vem sendo estudada para sua valorização mediante a produção de metano. A elevada carga orgânica (1800 g CQO.L-1) do glicerol bruto pode provocar stress cinético, o que se traduz numa inibição dos microrganismos metanogénicos. Para contornar o problema, uma alternativa é o uso prévio da energia ultrassónica, que pro...
Insights on sulfamethoxazole bio-transformation by environmental proteobacteria...
Reis, Patrícia J. M.; Homem, Vera; Alves, Arminda; Vilar, Vítor J.P.; Manaia, Celia M.; Nunes, Olga C.Although sulfonamide residues are frequently reported as freshwaters contaminants, information on the ability of native bacteria to modify these synthetic antibiotics is scarce. Our purpose was to investigate the potential of bacteria from different aquatic environments to cleave or transform sulfamethoxazole (SMX) and infer on their ability to reduce the toxicity of this antibiotic. From a collection of about ...