Studio di impatto ambientale nell'area portuale antistante lo stabilimento industriale EniChem di Porto Torres

This paper reports environmental study carried out in the seaport wear Petro-chemical Plant of Porto Torres (North-Western Sardinia) eight years after study where four areas at different level of pollution were described. In the meantime specific, ecological plants are realized i.e. liquid effluent collectors, biological water treatment plant and a stelling basin of depurated effluents. The present work shows a general improvement of the harbour area, as water quality and transparency, heavy metals content of sediments and aquatic flora. In this way two different methods are used (synecological and chemical), i.e. mapping of biotic community, density of Posidonia oceanica seagrass, chemical analysis of oysters, posidonia's rhizome and leaf, water and sediments

New insights into the efficient charge transfer of ternary chalcogenides composites of TiO2

Abstract A two-step solvothermal synthesis was adopted to prepare AgXSe2-TiO2 (X = In, Bi) composites. DFT study of the pristine parent samples showed the formation of the hexagonal phase of AgBiSe2, and tetragonal phase of AgInSe2 and TiO2, which corroborated the experimentally synthesised structures. Both the AgBiSe2-TiO2 and AgInSe2-TiO2 composites displayed enhanced visible light absorption and reduced band gap in the UV-DRS patterns. The XPS results exhibited a shift in binding energy values and the TEM results showed the formation of spherical nanoparticles of both AgBiSe2 and AgInSe2. The PL signals displayed delayed recombination of the photogenerated excitons. The as synthesised materials were studied for their photocatalytic efficiency, by hydrogen generation, degradation of doxycycline, and antimicrobial disinfection (E. coli and S. aureus). The composite samples illustrated more than 95 % degradation results within 180 min and showed 5 log reductions of bacterial strains within 30 min of light irradiation. The hydrogen production outcomes were significantly improved as the AgBiSe2 and AgInSe2 based composites illustrated 180-fold and 250-fold enhanced output compared to their parent samples. The enhanced photocatalytic efficiency displayed is attributed to the delayed charge recombination of the photogenerated electron-hole pairs in the AgXSe2-TiO2 interface. Formation of a p-n nano heterojunction for AgBiSe2-TiO2 and type II heterojunction for AgInSe2-TiO2 composite are explained

Photocatalytic hydrogen production through photoreforming of organics using copper – based photocatalyst under visible light radiation

Nowadays, 80% of global energy consumption is dependent on fossil fuels, leading different problems such as the decreasing of energy sources and the environmental problems (global warming, greenhouse effect, production of harmful gases, ozone layer depletion and acid rain). Hydrogen represents a potential alternative energy carrier due to its stability and zero emission of greenhouse gases, and many researches are directed toward the utilization of metal oxides semiconductors (such as TiO2 and ZnO) as photocatalysts to convert solar energy into hydrogen; in particular TiO2, due to its high chemical stability and photocatalytic activity in the UV range is the most widely used material; despite the great number of positive characteristics, TiO2 presents different problems such as high electron – hole recombination rate and poor absorption under the visible light, due to its wide band gap (about 3.2 eV). To overcome these drawbacks, several studies reported the utilization of TiO2 in association with other semiconductors such as ZnO and Cu2O; in particular much attention has attracted Cu2O: this is a non-toxic and abundant material, with a narrow band gap (about 2.1 eV); as p – type semiconductor, if combined with a n – type semiconductor, it is able to form a heterojunction photocatalyst, extending the light absorption in the visible range and reducing of electron-hole recombination rate. Several techniques have been used for Cu2O/TiO2 composite preparation and numerous disadvantages are still associated to each of them. In the present research, based on the outcomes of an extended literature analysis, a ball milling method to dryness has been chosen as alternative technique to prepare the photocatalysts, due to its simplicity and industrial applicability. The effect of milling time, rotation rate and Cu2O percentage on the photocatalytic hydrogen generation have been evaluated, obtaining the best performances (H2 generation about 60 μmol/h) with a milling time of 1 minute and a rotation rate of 200 rpm, when 1%wt of Cu2O is used in the composite in presence of methanol as scavenger. Moreover, the effect of the sacrificial agent used is evaluated adopting in the tests other species, and recognizing glycerol as the best candidate to produce hydrogen among the tested organics. Furthermore, the photocatalytic activity of the best prepared photocatalyst was evaluated at varying the pH and the temperature of the suspension, methanol concentration and catalyst load. In particular, a great positive effect was recorded at increasing the temperature of the system, showing a hydrogen productivity about 4.5 – fold higher than that obtained at the lowest temperature. Moreover, being the aim of the present work devoted to the development of a visible light active photocatalytic system, the possibility of using it by exploiting the solar light was evaluated, obtaining a hydrogen production about 5 – fold higher than that collected under simulated solar conditions. Finally, the development of a suitable mathematical model able to predict the hydrogen production in presence of the selected catalyst was also attempted

L’Adult Attachment Interview nella pratica clinica

Obiettivo: Fare una breve rassegna delle molteplici utilizzazioni dell’Adult Attachment Interview (AAI) in campo clinico e riferire le esperienze personali nell’uso di questa intervista. Il primo paziente descritto era un adolescente di 15 anni con sintomi dissociativi. Sia il paziente che la madre avevano uno stato della mente disorganizzato, un dato che ha consentito di fare delle considerazioni sulla trasmissione intergenerazionale del lutto non risolto. Sui trascritti delle sedute di questa psicoterapia breve sono state evidenziate le modificazioni della coerenza man mano che procedeva il trattamento. Al secondo paziente, un caso di disturbo post-traumatico da stress, l’AAI è somministrata quattro volte nel corso del trattamento quadrisettimanale durato otto anni e si è passati da una condizione di non risoluzione alla sicurezza. È stata messa sotto controllo anche una sintomatologia alessitimica. Il graduale miglioramento della coerenza nelle sedute e la modificazione del modello di attaccamento sono stati riscontrati anche in psicoterapie non intensive. Metodologia:Viene illustrata la metodologia della somministrazione dell’intervista e le motivazioni che hanno spinto l’Autore a usarla. Conclusioni: L’AAI è sempre più utilizzata in una grande varietà di contesti clinici. Nei trattamenti psicoanalitici e nelle psicoterapie a orientamento psicodinamico è documentata la possibilità di modificare il modello di attaccamento del paziente

L’uso dell’Adult Attachment Interview nello studio di un caso di disturbo post-traumatico da stress

Premesse teoriche: Il punto di raccordo più importante tra psicoanalisi contemporanea e teoria dell’attaccamento è indubbiamente il tema dei Modelli Operativi Interni (MOI), un tema fondamentale sia a livello teorico sia a livello delle strategie terapeutiche. Una relazione terapeutica, vista sempre più nei suoi aspetti interattivi, consente una esperienza emozionale correttiva nel corso del trattamento. Obiettivo: Obiettivo di questo lavoro è quello di documentare la trasformazione dei Modelli Operativi Interni di un paziente con l’uso dell’Adult Attachment Interview (AAI) somministrata tre volte nel corso del trattamento. Metodologia: Alla fine della prima consultazione viene proposta al paziente la somministrazione dell’AAI che avverrà in seconda seduta mentre nella terza viene valutato inizialmente l’impatto che ha avuto sul paziente questa esperienza soprattutto per registrare un eventuale arricchimento dell’insight. L’AAI è stata somministrata nuovamente dopo 2 anni di trattamento e anche in seguito mostrando significativi cambiamenti nella classificazione. Discussione critica e conclusioni: Dopo una discussione sui ricordi traumatici, sui sistemi di memoria oggi identificati, sulle radici infantili dell’ipervigilanza mostrata dal paziente in seduta e sull’alessitimia, viene sottolineato che un’area importante che il paziente non riesce ancora a risolvere è quella delle relazioni sentimentali. Alcune considerazioni sul quadro neurobiologico del DPTS concludono il lavoro

Photocatalytic Applications in Wastewater and Air Treatment: A Patent Review (2010–2020)

In this work, we reviewed the most significant patents of the last decade (2010–2020) in the fields of water and air photocatalytic treatment. Patents were discussed by identifying the recurrent addressed issues and presenting the proposed solutions. Adoption of TiO2 and/or modified-TiO2-based material is still the most common choice of inventors, whereas many patents focus on the design of the plants/devices to improve efficiency of photocatalytic treatment by improving light utilization and contact between the phases. The review also highlights issues deriving from specific applications and outlines future trends in the field, such as the need for standardized testing and digitalization of monitoring and control

Photocatalytic applications in wastewater and air treatment: A patent review (2010–2020)

In this work, we reviewed the most significant patents of the last decade (2010–2020) in the fields of water and air photocatalytic treatment. Patents were discussed by identifying the recurrent addressed issues and presenting the proposed solutions. Adoption of TiO2 and/or modified-TiO2-based material is still the most common choice of inventors, whereas many patents focus on the design of the plants/devices to improve efficiency of photocatalytic treatment by improving light utilization and contact between the phases. The review also highlights issues deriving from specific applications and outlines future trends in the field, such as the need for standardized testing and digitalization of monitoring and control