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Comparison of performance of recursive partitioning models and parametric imputation models based on predictive mean matching in multiple imputation by chained equations, in the presence of an interaction effect
Get PDFبررسی فراوانی مصرف اپیوم و ارتباط آن با ابتلا به بیماری کووید-19 در بیماران بستری بیمارستان افضلی پور کرمان در سال ۱۴۰۰
Get PDFبررسی فراوانی رتینوپاتی نوزادان نارس متولد شده در بیمارستان های آموزشی دانشگاه علوم پزشکی کرمان طی سال های ۱۳۹۴ تا ۱۳۹۷
Get PDFبررسی فراوانی واریاسیون های شریان های شکمی و تنگی شریانی در بیماران مبتلا به آنوریسم آئورت شکمی در تصاویر حاصل از سی تی اسکن، آنژیوگرافی و آرتریوگرافی
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بررسی وضعیت روش های سازگاری با استرس و ارتباط آن با ویژگی های فردی و شغلی در پرستاران بیمارستان های آموزشی دانشگاه علوم پزشکی کرمان در سال ۱۴۰۰
Get PDFبررسی اثر شدت ورزش استقامتی بر برخی فاکتورهای اکسیدانی و آنتی اکسیدانی کبدی در مدل اوتیسم القا شده توسط والپروئیک اسید در موش صحرایی
Get PDFInvestigating the effect of exercise intensity on some liver oxidant and antioxidant factors in a rat valproic acid-induced autism model
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Single and competitive adsorption of Cu2+ and Pb2+ by tea pulp from aqueous solutions
Get PDFBackground: Removal of heavy metals by bioadsorbents is one of the effective and inexpensive methods
for water and wastewater treatment. The aim of this study was to investigate the ability of tea pulp in
order to remove Cu+2 and Pb+2 metals in two states of adsorption (single element and two elements) from
aqueous solutions.
Methods: Experiments were performed on synthetic and real samples at ambient temperature. The
effect of solution pH, adsorbent dose, contact time, and initial concentration on single and competitive
removal of copper metals and lead was studied. Adsorption kinetics and adsorption isotherms were
analyzed by pseudo-second-order kinetic equations, Elovich model and intraparticle diffusion,
Freundlich and Langmuir equations, respectively.
Results: The maximum adsorption capacity for copper and lead was observed at pH = 5-8 and pH = 4-8,
respectively. Maximum adsorption capacity for copper and lead by tea pulp in single-element solution
(single) was 37.17 and 48.54 mg/g and in two-element solution (competitive), was 28.41 and 43.47 mg/g,
respectively. The adsorption reaction of heavy metals by tea pulp followed the Longmuir isotherm and
pseudo-second-order kinetic models.
Conclusion: Tea pulp as an inexpensive bioadsorbents is able to remove about one-third of the copper,
and approximately, half of lead from aqueous solutions, so its use in the treatment of aqueous solutions
will be beneficial.
Keywords: Copper, Lead, Adsorption, Te