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Featured researches published by Carlo Porfido.


Talanta | 2018

Application of micro X-ray fluorescence and micro computed tomography to the study of laser cleaning efficiency on limestone monuments covered by black crusts

Giorgio S. Senesi; Ignazio Allegretta; Carlo Porfido; Olga De Pascale; Roberto Terzano

Laser cleaning is widely used to remove black crusts from weathered limestone monuments. The cleaning efficiency is commonly tested using conventional analytical techniques, which do not allow to analyze the same sample before and after the treatment. In this paper, micro computed tomography (μ-CT) and micro X-ray fluorescence spectroscopy (μ-XRF) techniques were used for the first time to evaluate the laser cleaning efficiency on two different encrusted quoins collected from a limestone monument. Analyses were carried out non-destructively on the same portion of the two lithotypes before and after the treatment. μ-XRF confirmed the presence of gypsum in the black crust, and showed a marked decrease of S and other typical elements after laser cleaning of both samples. μ-CT clearly showed the different structure of limestone before and after cleaning and the crust portion removed by the laser. The combination of the two techniques allowed to assess that, even if the two samples had a similar chemical composition, their response to laser cleaning was different on dependence of their different fabric/structure. In fact, in one sample calcium sulphate was still partially retained also after the black crust removal, whereas in the other sample the sulphate layer was almost completely ablated due to its more compact structure. In both cases, laser cleaning operation was shown not to cause any structural modification or mechanical damage of the original stone material. In conclusion, the use of these novel techniques appears very promising for studying the effects of laser ablation on rock samples in order to set the best working conditions for their cleaning.


Journal of Hazardous Materials | 2018

Alkaline hydrothermal stabilization of Cr(VI) in soil using glass and aluminum from recycled municipal solid wastes

Concetta Eliana Gattullo; Caterina D’Alessandro; Ignazio Allegretta; Carlo Porfido; Matteo Spagnuolo; Roberto Terzano

Hexavalent chromium was stabilized in soil by using a mixture of glass and aluminum recovered from municipal solid wastes under alkaline hydrothermal conditions. Cr(VI) concentration was reduced by 94-98% already after 7days of treatment. After the same period, more than 90% of total Cr was stabilized in highly recalcitrant and scarcely mobile chemical forms, with 50% in the residual fraction (when the samples were treated at 1/10w/w mixture/soil ratio). Longer treatments increased Cr stabilization. X-ray microanalyses revealed that Cr was stabilized in geopolymeric structures within large aluminosilicate mineral aggregates (containing both amorphous and crystalline phases). 3D microstructural analyses showed a limited compaction of the soil with still a 20% internal porosity in the neoformed aggregates. Increased pH and salinity after the treatment can be restored by simple soil amendments and washing.


Polymer Testing | 2017

Multiwalled carbon nanotube promotes crystallisation while preserving co-continuous phase morphology of polycarbonate/polypropylene blend

P. Mohammed Arif; C. Sarathchandran; Aravinda Narayanan; A. Saiter; Roberto Terzano; Ignazio Allegretta; Carlo Porfido; Nandakkumar Kalarikkal; Sabu Thomas


Spectrochimica Acta Part B: Atomic Spectroscopy | 2017

Determination of As concentration in earthworm coelomic fluid extracts by total-reflection X-ray fluorescence spectrometry

Ignazio Allegretta; Carlo Porfido; Onofrio Panzarino; Maria Chiara Fontanella; Gian Maria Beone; Matteo Spagnuolo; Roberto Terzano


Archive | 2016

Bioavailability of arsenic in two Italian industrial contaminated soils

Carlo Porfido; Ignazio Allegretta; Onofrio Panzarino; Roberto Terzano; E de Lillo; Matteo Spagnuolo


III International Conference on Applied Mineralogy & Advanced Materials - MMS 2018 | 2018

FROM ARCHAEOLOGICAL DRAWING TO X-RAYS MICROTOMOGRAPHY ANALYSIS FOR TECHNO-FUNCTIONAL ANALYSIS: THE CASE OF STONE ARROWHEADS OF COPPA NEVIGATA (BRONZE AGE, SOUTHERN ITALY)

Ignazio Allegretta; Mironti Vittorio; Recchia Giulia; Lemorini Cristina; Stella Nunziante Cesaro; Carlo Porfido; Roberto Terzano; Italo Maria Muntoni; Giacomo Eramo


Environmental Science and Pollution Research | 2018

Characterization of As-polluted soils by laboratory X-ray-based techniques coupled with sequential extractions and electron microscopy: the case of Crocette gold mine in the Monte Rosa mining district (Italy)

Ignazio Allegretta; Carlo Porfido; María Martín; Elisabetta Barberis; Roberto Terzano; Matteo Spagnuolo


XXXV CONVEGNO NAZIONALE della Società Italiana di Chimica Agraria - SICA 2017 | 2017

Approccio analitico integrato per la caratterizzazione di suoli inquinati da metalli pesanti

Concetta Eliana Gattullo; Ignazio Allegretta; Carlo Porfido; Rosaria Mininni; Matteo Spagnuolo; Roberto Terzano


Technart 2017 | 2017

Micro X-ray fluorescence and micro computed tomography applied to characterize the limestone of a quoin of Castello Svevo, Bari, Italy

Giorgio S. Senesi; Ignazio Allegretta; Carlo Porfido; Roberto Terzano; Olga De Pascale


17th International Conference on Total Reflection X-ray Fluorescence Analysis and Related Methods | 2017

TXRF analysis of earthworm coelomic fluid extracts: a useful tool to assess the bioavailability of As in soils

Ignazio Allegretta; Carlo Porfido; Onofrio Panzarino; Enrico de Lillo; Matteo Spagnuolo; Roberto Terzano

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Gian Maria Beone

Catholic University of the Sacred Heart

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