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RISS 인기검색어
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- 저자 : Hosseini Asma (검색결과 3 건)
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Hosseini Asma,Faghihian Hossein 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
A novel photocatalyst was prepared by immobilization of TiO2 on the surface of FSM-16 catalyst support,and was characterized by different techniques. Optical properties of synthesized sample studied bydiffuse reflectance spectroscopy, and photoluminescence analysis indicated that after immobilization thebang gap energy of TiO2 was shifted to visible region, and electron-hole recombination was reduced. Thedegradation tests performed at various conditions under UV and visible lights showed that at optimizedconditions 91% of benzothiophene and 77% of dibenzothiophene were eliminated. Degradation productswere identified by GC–MS, and were removed by MCM-41 adsorbent. The used photocatalyst was highlyregenerable.
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Biological soil crusts impress vegetation patches and fertile islands over an arid pediment, Iran
Sepehr Adel,Hosseini Asma,Naseri Kamal,Gholamhosseinian Atoosa 한국생태학회 2022 Journal of Ecology and Environment Vol.46 No.1
Background: Plant vegetation appears in heterogeneous and patchy forms in arid and semi-arid regions. In these regions, underneath the plant patches and the empty spaces between them are covered by biological soil crusts (moss, lichen, cyanobacteria, and fungi). Biological soil crusts lead to the formation and development of fertile islands in between vegetation patches via nitrogen and carbon fixation and the permeation of runoff water and nutrients in the soil. Results: The present study has investigated the association of biological soil crusts, the development of fertile islands, and the formation of plant patches in part of the Takht-e Soltan protected area, located in Khorasan Razavi Province, Iran. Three sites were randomly selected as the working units and differentiated based on their geomorphological characteristics to the alluvial fan, hillslope, and fluvial terrace landforms. Two-step systematic random sampling was conducted along a 100-meter transect using a 5 m2 plot at a 0–5 cm depth in three repetitions. Fifteen samplings were carried out at each site with a total of 45 samples taken. The results showed that the difference in altitude has a significant relationship with species diversity and decreases with decreasing altitude. Results have revealed that the moisture content of the site, with biocrust has had a considerable increase compared to the other sites, helping to form vegetation patterns and fertile islands. Conclusions: The findings indicated that biological crusts had impacted the allocation of soil parameters. They affect the formation of plant patches by increasing the soil’s organic carbon, nitrogen, moisture and nutrient content provide a suitable space for plant growth by increasing the soil fertility in the inter-patch space.
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Cadmium removal from aqueous solution by brown seaweed, Sargassum angustifolium
Seyed Ali Jafari,Abbas Jamali,Asma Hosseini 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.10
Four kinds of indigenous seaweed were employed for assessing their soluble cadmium biosorption performance. Sargassum angustifolium revealed the greatest capacity in the range of equilibrium cadmium concentration lower than 0.5mmol l−1. It was further examined by optimization, equilibrium, kinetic and thermodynamic studies. It was found that1 g l−1 biosorbent at initial pH of 6 and 38 oC revealed the highest Cd2+ uptake. Kinetic studies revealed that the Cd2+ biosorption included a two-stage mechanism with an initial rapid stage during the first 30 min where ion exchange was the dominant mechanism. The process gradually reached equilibrium after 40-50 min of contact where the metal adsorption occurred too low due to the intraparticle diffusion. However, it was not the sole rate-limiting step. The pseudo-second order kinetic model, unlike the pseudo-first order, excellently described the experimental data in the whole range of contact time. The Langmuir isotherm model was more successful in describing the equilibrium data than the Freundlich and D-R models. Using this isotherm model, a relationship was proposed to predict the dose of biosorbent needed for removing specific initial cadmium concentration from aqueous solution or to meet a desire equilibrium cadmium concentration. The spontaneity and endothermicity as well as increasing randomness at the solid/solution interface during the biosorption were revealed by means of the thermodynamic studies.
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