عنوان مقاله
نانو ذرات نقره بارگذاری شده برروی کربن فعال شده به عنوان یک جاذب برای حذفSUDAN RED 7B از محلول آبی
فهرست مطالب
چکیده
مقدمه
مواد و روش ها
نتایج و بحث
نتیجه گیری
بخشی از مقاله
اندازه گیری جذب رنگ
غلظت های SR7B در محلول به روش کمی با استفاده از معادلات رگرسیون خطی به دست آمده از طریق ترسیم منحنی کالیبراسیون برروی رنج غلظت ها تخمین زده شدند. ظرفیت جذب سطحی رنگ ماده جاذب در بازه های زمانی 0-35 دقیقه و در دماهای مختلف (60- 10 درجه سانتی گراد) تعیین گردید. مقدار رنگ جذب شده توسط جاذب، qe (mg g−1 )، با رابطه موازنه جرم زیر محاسبه گردید:
qe = (C0 − Ce) V/W
کلمات کلیدی:
SILVER NANOPARTICLE LOADED ON ACTIVATED CARBON AS AN ADSORBENT FOR THE REMOVAL OF SUDAN RED 7B FROM AQUEOUS SOLUTION Farzaneh Marahel1,*, Mehrorang Ghaedi1 and Syamak Nasiri Kokhdan2 1 Chemistry Department, Islamic Azad University, Omidiyeh Branch, Omidiyeh, Iran 2 Young Researchers club, Yasooj Branch, Islamic Azad University, Yasooj, Iran ABSTRACT In this research adsorption and removal of Sudan red 7B (SR7B) from aqueous solution using silver nanoparticle loaded on activated carbon (Ag-NP-AC) has been investigated. Equilibrium data are mathematically modeled using the Freundlich Langmuir, Tempkin and DubininRadushkevich (D–R) adsorption models. The SR7B adsorption kinetics on to Ag-NP-AC was studied in terms of pseudo-first-order, pseudo-second-order, Intraparticle diffusion and Elovich models. A maximum adsorption capacity of 90.909 mg.g-1 based on Langmuir as most applicable model at equilibrium is achieved. The high capacity and low removal time show the suitability and usefulness of Ag-NP-AC alternative adsorbent for the removal of SR7B in wastewater treatment. KEYWORDS: Sudan red 7B (SR7B); Silver nanoparticle loaded on activated carbon (Ag-NP- AC); Kinetic. 1. INTRODUCTION Dyes as multiple varieties generally resist the breakdown of long-term exposure to sunlight, water and other atrocious conditions. Therefore, the dye treatment of wastewater is a difficult task. Azo dyes among overall category of synthetic textile dyestuffs consist of half of global production and during dyeing operation processes emerged to wastewaters [1]. The removal of dye (as widely applicable modern industry) from textile effluents is one of the most significant environmental problems synthetic origin and complex aromatic molecular structures dye are inert and difficulty biodegradable and harmful to aquatic life in rivers. The occupational exposure of workers in the textile industries is linked to a higher bladder cancer risk. The use of hair coloring products and breast cancer has also been linked [2-4]. * Corresponding author FIGURE 1 - Chemical structure of Sudan Red. The group of color additives known as Sudan dyes (Fig.1) consists of a number of red colors, e.g., Sudan I through IV, Sudan Orange G, Sudan Red B, Sudan Red G, and Sudan Red 7B. Since their degradation products carcinogens and teratogens, their application as foodadditives is forbidden. However, in some countries, these dyes are still occasionally used to intensify the color of bell pepper and chili powders. The EU-Rapid Alert System (RASFF) disseminated a series of notifications concerning the presence of Sudan dyes in chili products and other foods (spices, tomato sauces, pastas and sausages) [5]. Synthetic dyes treatment from wastewater before discharging to environment before their offering to public use is essential for the protection of health and environment is required. Some of the techniques used in treatment of wastewaters containing dyes are flocculation, coagulation, precipitation, adsorption, membrane filtration, electrochemical techniques, ozonation and fungal decolorization [6]. Among these techniques, adsorption is an effective technique in term of efficiency, capacity and large scale applicability to as well as the regeneration recovery and recycling potential of adsorbents [6–10]. Some commercial systems currently use activated carbon as an adsorbent to remove dyes in wastewater [11-14]. However, the high cost of activated carbon and high removal times restricts its comprehensive use. Although the adsorption behaviors of aromatic adsorbate on gold and silver nanoparticle surfaces have been extensively investigated, the enhancement mechanism is not completely understood. In this paper, we describe the adsorption of SR7B from aqueous solutions onto this Ag-NP-AC adsorbent has reported. Equilibrium
