توليد كربن فعال مزوحفره از پسماند ليگنوسلولزي براي حذف رنگ‌هاي راكتيو بلو 19 و بلو 21 از محلول آبي

Mesoporous activated carbon production from lignocellulose waste for removing reactive dyes Blue 19 and Blue 21 from aqueous solution

تخليه پساب تصفيه نشده صنايع نساجي به دليل استفاده از تركيبات سمي در آن‌ها‌ باعث آلودگي در محيط‌هاي آبي و مشكلات بزرگ زيست‌ محيطي و بهداشتي مي‌شود. هدف از اين مطالعه بررسي پتانسيل جذب كربن فعال توليد شده از پسماند چوب انگور (Vitis Vinifera) به منظور حذف رنگ‌هاي راكتيو بلو 19 (RB19) و بلو 21 (RB21) از محلول آبي است. كربن فعال از چوب انگور و با استفاده از فعال‌ساز اسيد فسفريك (H3PO4) با نسبت‌هاي اشباع 1:1، 1:2، 1:3 و 1:4 سنتز شد. آناليزهاي BET،FTIR و SEM براي تعيين مشخصات كربن فعال انجام شد. همچنين آزمايش جذب رنگ براي همه نمونه‌ها در شرايط يكسان: pH برابر 2، دوز جاذب g/l 01/0، غلظت اوليه رنگ mg/l 250، دما C° 20، حجم محلول ml100 و زمان تماس 120 دقيقه انجام شد. نتايج نشان داد نمونه كربن فعال‌سازي شده در نسبت اشباع 1:4 در دماي C° 600 با سطح ويژه g/2m 1850 و حجم كلي حفرات g/3 cm40/2 و توزيع حفرات 86 درصد در محدوده مزوحفره با mg/g 1932 براي رنگ بلو 19 و mg/g 908 براي رنگ بلو 21 داراي حداكثر مقدار ظرفيت جذب است. اين مطالعه نشان داد كربن فعال تهيه‌شده از پسماند حاصل از هرس ساليانه سرشاخه‌هاي درختچه مو از پتانسيل بالايي در تصفيه پساب صنايع نساجي برخوردار است.

Mesoporous activated carbon production from lignocellulose waste for removing reactive dyes Blue 19 and Blue 21 from aqueous solution Introduction. Reactive dyes have been increasing in textile industries for dyeing natural and synthetic fibers. Discharge of dye- bearing waste-water makes an adverse effect on aquatic environment because the dyes give water undesirable color. The major environmental and health problems associated with water pollution caused by the discharge of untreated textile effluent are due to disorders in the aquatic environment because of use of toxic chemicals. The aim of this study was to investigate the adsorption potential of as-produced activated carbon from grape wood residue (Vitis Vinifera) in order to remove Reactive Blue 19 (RB19) and Reactive Blue 21 (RB21) dyes from aqueous solution. Activated carbon is the most common adsorbent for the removal of many dyes.Activated carbons are made from various agricultural wastes by physical and chemical activation. The preparation of activated carbon from agricultural waste could increase economic return and also provides an excellent method for the solid waste disposal thereby reduce pollution. Method: The adsorbates in this study included three reactive dyes, Reactive Red 23 (RR23), Reactive Blue 19 and Reactive Blue 21. All dyes were commercial grade and employed without further purification. The activated carbon was synthesized from grape wood biomass by activation of phosphoric acid (H3PO4) with impragnation ratios of 1:1 1:2,1:3, 1:4. The FTIR, BET, and SEM techniques were used to characterize the as-prepared carbon materials. In addition, dye adsorption experiments were carried out, which measurements are taken for all of the samples under in the same condition, at pH of 2, adsorbent dose of 0.01 g/l, initial dye concentration of 250 mg/l, sworking volume of 100 ml, and contact time of 120 min. Results and discussion: The results showed that the carbon sample activated under imprenation ratio of 1:4 and temperature of 600oC, that obtained a special surface area of 1850 m2/g, and total pore volume of 2.40 cm3/g, and pore size distribution of mesoporous at 86%, had maximum adsorption capacity of 1932 and 908 mg/g for RB19 and RB21 dyes, respectively. The adsorption behaviors of three reactive dyes (Reactive Blue 19 23, Reactive Blue 21) onto this biomass activated carbon were investigated in batch systems. The experimental data were analysed by the Langmuir, Freundlich and Sips models of adsorption. Equilibrium data of dyse fitted well with the Sips model. The rates of adsorption were found to conform to the pseudo-second-order kinetics with good correlation. The equilibrium adsorption capacity of the Activated carbon was determined with the Langmuir equation found to be 1914 mg/g for Reactive Blue 19 and 1195 mg/g for Reactive Blue 21. Conclusion: This study showed that activated carbon produced from annual pruning vineyards waste has a high potential in the treatment of textile wastewater. Also results indicate that Activated carbon from grape wood could be employed as low-cost alternative to commercial activated carbon in wastewater treatment for the removal of acid dyes. Keywords: Activated carbon, lignocellulose waste, Grape wood, Blue 19, Blue 21