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Iranian Journal of Health Sciences، جلد ۴، شماره ۲، صفحات ۵۵-۷۰
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| عنوان فارسی |
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| چکیده فارسی مقاله |
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| کلیدواژه‌های فارسی مقاله |
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| عنوان انگلیسی |
Direct Blue 71 Removal from Aqueous Solutions by Adsorption on Pistachio Hull Waste: Equilibrium, Kinetic and Thermodynamic Studies |
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| چکیده انگلیسی مقاله |
Background and Purpose: Azo dyes including Direct Blue 71 (DB71) are toxic, mutagenic and carcinogenic contaminants in effluents of industries. This study aimed to investigate the adsorption of DB71 from aqueous solution onto pistachio hull waste (PHW) as a low-cost adsorbent. Materials and Methods: A series of experiments were performed via batch adsorption technique to examine the effect of the process variables such as contact time 0-210 minutes, initial dye concentration 10-100 mg/l, pH 2-12, adsorbent 0.05-1 g/l, and the processing temperature of 25, 40, and 50° C. The concentration changes of DB71 were measured using the colorimetric method by the spectrophotometer T80 ultraviolet/visible at the 587 nm wavelength. Moreover, The PHW was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, Freundlich and Langmuir isotherm model, pHpzc and Brunauer–Emmett–Teller (BET) surface area analysis. Results: Maximum adsorption capacity was 90.48 mg DB71 per 1 g adsorbent at pH 2, DB71 100 mg/l, temperature 50° C, and time 210 minutes. In general, by increasing the adsorbent dosage, time, and processing temperature, the removal efficiency was increased; however, incrementing pH and dye concentration had a reverse effect. Maximum BET specific surface and total pore volume on the adsorbent were 1.04 m2/g and 0.0002 cm3/g, respectively. The Freundlich isotherm (R2 = 0.9912) model fits the equilibrium data better than the Langmuir isotherm (R2 = 0.9024) model. The adsorption kinetic was found to be well described by the pseudo-second-order model. Thermodynamic analysis indicated that the adsorption process is a spontaneous and endothermic process. Conclusion: PHW can be used well as a low-cost surface adsorbent in the treatment of DB71 from aquatic environments. |
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| کلیدواژه‌های انگلیسی مقاله |
Direct Blue 71, Adsorption, Pistachio Hull, Aqueous |
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| نویسندگان مقاله |
حامد بیگلری | hamed biglari
department of environmental health engineering, school of health, gonabad university of medical sciences, gonabad, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی گناباد (Gonabad university of medical sciences)
نسیبه جوان | nasibeh javan
health promotion research center, zahedan university of medical sciences, zahedan, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی زاهدان (Zahedan university of medical sciences)
رسول خسروی | rasoul khosravi
department of environmental health, school of medical sciences, birjand university of medical sciences, birjand, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی بیرجند (Birjand university of medical sciences)
امین زارعی | amin zarei
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| نشانی اینترنتی |
http://jhs.mazums.ac.ir/browse.php?a_code=A-10-476-6&slc_lang=fa&sid=en |
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| کد مقاله (doi) |
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| زبان مقاله منتشر شده |
en |
| موضوعات مقاله منتشر شده |
بهداشت |
| نوع مقاله منتشر شده |
پژوهشی |
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