نتایج جستجو برای: Modified zeolite

تعداد نتایج: 258999  

2016
Jing Shi Naiming Zhang Chenguang Zhang Boxian Wei

The activation of soil-fixed phosphorus is a long-term concern in soil science. In order to enhance the activation effect to soil-fixed phosphorus in red soil, different modified zeolite, through physical, chemical method and the associated both physics and chemistry, was used in this paper. The results showed as following: 1) the activated ability to soil-fixed phosphorus in red soil for modif...

Journal: :محیط شناسی 0
عادل اصفهانی گروه مهندسی آب دانشگاه زابل، دانشجوی کارشناسی ارشد آبیاری و زهکشی زمان شامحمدی حیدری گروه مهندسی آب دانشگاه زابل، دانشیار گروه مهندسی آب

the purpose of this study is comparison of manganese absorption capacity by natural and modified zeolite. for this purpose used by from semnan mines zeolite with mean particle diameter of 360 micrometer. for modified zeolite, 5 g amount of natural zeolite with 100 ml of 1 m sodium chloride solution mixed and maintained at 24 hours in room temperature. for measure specific surface of absorbents,...

Journal: :تحقیقات نظام سلامت 0
محسن سعدانی دانشجوی دکتری، مرکز تحقیقات محیط زیست، دانشگاه علوم پزشکی اصفهان، مربی، دانشکده بهداشت، دانشگاه علوم پزشکی و خدمات بهداشتی درمانی شهید صدوقی یزد، ایران احسان ابویی مهریزی عضو هیأت علمی گروه مهندسی بهداشت محیط دانشگاه علوم پزشکی خراسان شمالی، بجنورد، ایران کمال غدیری دانشجوی دکتری بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی تهران، تهران، ایران

background: presence of heavy metals in leachate due to the biological accumulation characteristics of these materials endangered the living creatures' health especially human. purpose of this study is to study and investigate the possibility of two metals' absorption i.e, lead and cadmium from leachate by natural zeolite clinopteliolit and increase of the ability to absorb the zeolite by modif...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2003
Z Milán P Villa E Sánchez S Montalvo R Borja K Ilangovan R Briones

The effect of natural and modified zeolites on the anaerobic degradation of acetate and methanol was evaluated by the determination of specific methane productivity (SMP) in batch minidigesters of 50 mL at doses of 0.01, 0.05 and 0.1 g of zeolite/g of VSS. The effects of the different zeolite concentrations were determined by the results of the SMP. A kinetic characterization with data of accum...

Ali Azari, Amir Hossein Mahvi, Mohammad Saberi, Roshanak Rezaei Kalantary, Simin Naseri,

Background & Aims of the Study:  Nitrate is one of the most important pollutants that its reduced form, nitrite, can cause serious problems for human health and environment. Adsorption with cheap sorbents such as Zeolite is the best way for removal of this pollutant. So this study aimed to apply modified Clinoptilolite Zeolite for nitrate removal. Materials & Methods...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2007
hossein faghihian mohammad hossein mousazadeh

the ability of natural clinoptilolite and its modified forms were studied for removal of pahs from n-paraffin. surfactant modified zeolite (smz) was obtained by modifying clinoptilolite with hexadecyltrimethylammonium ion. homoionic forms of zeolite were obtained by ion exchange process using inorganic salts of desirable cations (e.g. ag+, fe3+…). natural clinoptilolite and its cation exchanged...

1997
Debra R. Rolison

The electroactivity of zeolite-encapsulated redox-active transition metal complexes, {M(L)}Z, was explored for Co(salen) and [Fe(bpy)3] formed in NaY zeolite (where salen ) N,N′-bis(salicylidene)ethylenediamine and bpy ) 2,2′-bipyridine). The zeolite boundary was characterized via X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry in nonaqueous electrolyte at either zeolite-modified ...

Background and purpose: Diazinon is one of the most widely used pesticides in agricultural pest control that pollutes water resources. The aim of this study was to evaluate the adsorption of diazinon from water by zeolite modified with cationic surfactant hexadecyltrimethyl ammonium bromide (HDTMA). Materials and methods: The amount of HDTMA surfactant used to modify the zeolite was one-fold E...

Journal: :آب و توسعه پایدار 0
مهدی وثوقی نیری امیرحسین محوی محمد جواد محمدی امیر حسین محوی محمود علی محمدی محمد شیرمردی ابوافضل نعیم آبادی

existence of acid humic in water resources is undesirable and causes carcinogenic component in disinfection process due to reaction with chlorine. due to their cost-effectiveness and higher physical resistance than activated carbon, natural zeloites are used for removing various pollutants. . in the present study, iranian natural zeolite modified with cetylpyridinium bromide (cpb) was investiga...

Journal: :health scope 0
amir hosein mahvi department of environmental health engineering, school of public health, tehran university of medical sciences, tehran, ir iran; center for solid waste research, institute for environmental research, tehran university of medical sciences, tehran, ir iran mehdi vosoughi department of environmental health engineering, school of public health, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; student research committee, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; department of environmental health engineering, school of public health, ahvaz jundishapur university of medical sciences, ahvaz, ir iran. tel: +98-9386939465, fax: +98-6113361544 mohammad javad mohammadi department of environmental health engineering, school of public health, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; clinical research development center, razi teaching hospital, ahvaz jundishapur university of medical sciences, ahvaz, ir iran anvar asadi department of environmental health, school of public health, shahid beheshti university of medical sciences, tehran, ir iran bayram hashemzadeh department of environmental health, khoy school of nursing and public health, urmia university of medical sciences, urmia, ir iran amir zahedi department of environmental health engineering, school of public health, ahvaz jundishapur university of medical sciences, ahvaz, ir iran

conclusions the findings of this study showed that the modification of natural zeolites can achieve higher adsorption capacity for organics. in addition, based on the results, natural zeolite being modified with sds as a cationic surfactant had good efficiency for the adsorption of nom. results the results indicated that sds-modified zeolite showed greatly enhanced adsorption capacity. findings...

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