IJE TRANSACTIONS B: Applications Vol. 30, No. 11 (November 2017) 1448-1457    Article in Press

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Ibrahim U. Salihi, S. R. Mohamed Kutty and M. H. Isa
( Received: June 01, 2017 – Accepted: September 08, 2017 )

Abstract    Municipal and industrial wastewater contains a lot of contaminants. The major contaminant of concern is the heavy metals. Heavy metals are known to be toxic, non-biodegradable and have a long half-life. The release of untreated wastewater containing heavy metals can cause serious problems to human, plants and animals. In this study, activated carbon was developed from sugarcane bagasse and its effectiveness in absorbing lead ions from wastewater was examined. Sugarcane bagasse activated carbon was developed in a tube furnace at a temperature of 900 °C, a heating rate of 10 °C/min, the residence time of 3 hrs, and at a nitrogen flow rate of 100 mL/min. Batch adsorption experiments were carried out to investigate the effects of pH and initial lead concentrations on the adsorption process. The batch adsorption test showed that extent of lead adsorption by SCBA was dependent upon pH and initial lead concentrations. The optimum pH for lead adsorption was found to be pH 5.0. Removal of lead decreases with the increase in initial metal concentrations. The adsorption of lead ions onto SCBA is a pseudo-second-order reaction model. The rate limiting step is a chemisorption or chemical adsorption that involves valence forces by means of electrons exchange between the SCBA and lead ions.


Keywords    Adsorption, lead, sugarcane, bagasse, activated carbon, heavy metals


چکیده    چكيده فاضلاب شهری و صنعتی شامل بسیاری از آلاینده های. آلاینده عمده ای از نگرانی فلزات سنگین است. فلزات سنگین هستند شناخته شده به سمی، غیر قابل تجزیه و نیمه عمر طولانی است. انتشار فاضلاب تصفیه نشده حاوی فلزات سنگین می تواند مشکلات جدی به انسان، گیاهان و حیوانات شود. در این مطالعه، کربن فعال از باگاس نیشکر توسعه داده شد و اثر خود را در جذب یونهای سرب از فاضلاب مورد بررسی قرار گرفت. نیشکر باگاس کربن فعال در یک کوره لوله در دمای 900 درجه سانتی گراد، نرخ حرارت از 10 درجه سانتی گراد / دقیقه، زمان اقامت 3 ساعت توسعه داده شد و در نرخ جریان نیتروژن 100 میلی لیتر / دقیقه. آزمایش های جذب دسته ای به منظور بررسی اثر غلظت و pH سرب اولیه در فرایند جذب انجام شد. آزمون جذب دسته ای نشان داد که میزان جذب سرب توسط SCBA وابسته به غلظت سرب اولیه pH و بود. pH بهینه برای جذب سرب به مقدار pH 5.0 پیدا شد. حذف سرب با افزایش غلظت اولیه فلز کاهش می یابد. جذب یونهای سرب بر روی SCBA یک مدل واکنش شبه مرتبه دوم است. گام نرخ محدود کردن شیمیایی یا شیمیایی جذب است که شامل نیروهای والانس با استفاده از تبادل الکترون بین SCBA و یونهای سرب است.

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