fa مقایسه تاثیر استفاده از آلژینات و کیتوسان در سنتز جاذب های زئولیتی گرانول شده مورد استفاده در حذف آرسنیک تصفیه آب تصفیه آب پژوهشي Research <div style="text-align: justify;"><span style="line-height:150%"><span style="tab-stops:55.35pt"><span style="direction:rtl"><span style="unicode-bidi:embed"><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">زمینه و هدف:</span></span></span></b> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">زئولیت&shy; ها از جمله جاذب&shy; های پرکاربرد در حذف آلاینده سمی آرسنیک هستند. </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">هدف از این مطالعه تهیه جاذب&shy; های زئولیتی گرانولی شده، با استفاده از کیتوسان (</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">CS/Fe-Clin</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">) و آلژینات (</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">Alg/Fe-Clin</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">) و مقایسه آن&shy;ها از لحاظ شکل ظاهری و میزان جذب آرسنیک است.</span></span></span></span></span></span></span><br> <span style="line-height:150%"><span style="direction:rtl"><span style="unicode-bidi:embed"><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">روش بررسی:</span></span></span></b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> جاذب &shy;های گرانولی به روش ژلاسیون یونی تهیه شدند. تأثیر پارامترهای نوع و غلظت محلول اتصال&shy; دهنده عرضی و نسبت اولیه مواد در شکل &shy;گیری گرانول &shy;ها و </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">همچنین، تأثیر غلظت اولیه</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">آرسنیک</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">و مقدار</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">جاذب بر</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">میزان</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">جذب آرسنیک مورد بررسی قرار گرفت</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">. از آنالیز&shy;های </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">SEM</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">،</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">XRD </span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">،</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">FTIR </span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">&nbsp;و</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">AAS </span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">&nbsp;جهت تأیید نتایج استفاده گردید. داده&shy; های تعادلی با ایزوترم &shy;های فروندلیچ و لانگمویر مطابقت داده شد.</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:"B Lotus""></span></span></span></span></span></span><br> <span style="line-height:150%"><span style="direction:rtl"><span style="unicode-bidi:embed"><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">یافته&shy; ها:</span></span></span></b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> محلول اتصال &shy;دهنده عرضی کلرید آهن (</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">III</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">)</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">2 درصد وزنی و نسبت اولیه 4:1 از آلژینات به نانوکامپوزیت برای (</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">Alg/Fe-Clin</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">) و محلول اتصال&shy; دهنده عرضی سدیم هیدروکسید + سدیم تری&shy; پلی &shy;فسفات 2 درصد وزنی (1 درصد + 1 درصد) با نسبت اولیه 3:1 از کیتوسان به نانوکامپوزیت برای (</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">CS/Fe-Clin</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">)، </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">برای سنتز گرانول&shy; های دارای شکل کروی، استحکام مناسب و ظرفیت جذب بالا </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">انتخاب شدند. حداکثر</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">راندمان جذب جاذب &shy;های </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">Alg/Fe-Clin</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> و </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">CS/Fe-Clin</span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> به</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">ترتیب در دوزهای</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">0/6 و </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">g/L</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> 1 و در غلظت&shy; های اولیه 200 و</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">&micro;g/L </span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">&nbsp;300</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">، برابر با</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">88/1 و 92/9 درصد تعیین شد. </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">q_max</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">جاذب &shy;های </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">Alg/Fe-Clin</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> و </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">CS/Fe-Clin</span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> توسط ایزوترم لانگمویر به ترتیب</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">11/11 و </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">mg/g</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> 10 بدست</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">آمد. نتایج با ایزوترم&shy; فروندلیچ برازش بهتری نشان دادند.</span></span></span></span></span></span><br> <span style="line-height:150%"><span style="direction:rtl"><span style="unicode-bidi:embed"><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">نتیجه&shy; گیری:</span></span></span></b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> با توجه به ظرفیت جذب مناسب، هر دو جاذب سنتز شده قابلیت حذف مؤثر آرسنیک را داشته و اتصال دهنده آلژینات نسبت به کیتوسان در این زمینه کارآمدتر است.</span></span></span></span></span></span><br> &nbsp;</div> <div style="text-align: justify;"><span style="line-height:150%"><b><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">Background and Objective:</span></span></b> <span style="line-height:150%"><span new="" roman="" style="font-family:" times="">Zeolites are among the widely used adsorbents for the removal of arsenic-toxic pollutants. The objective of this study is to prepare granulated zeolite adsorbents using chitosan (CS/Fe-Clin) and alginate (Alg/Fe-Clin) and compare them in terms of physical appearance and arsenic adsorption efficiency.</span></span><span dir="RTL" lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:"B Lotus""></span></span></span></span><br> <span style="line-height:150%"><b><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">Materials and Methods:</span></span></b><b> </b><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">Granular adsorbents were prepared via the ionotropic gelation method. The effects of the type and concentration of the cross-linking solution and the initial ratio of materials in granules formation, as well as the effect of initial arsenic concentration, and the amount of adsorbent used on the adsorption efficiency, were investigated. SEM, XRD, FTIR, and AAS analyses were used to confirm the results.</span></span> <span lang="EN" style="line-height:150%"><span new="" roman="" style="font-family:" times="">Equilibrium data were matched with Freundlich and Langmuir isotherms.</span></span><span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:"B Lotus""></span></span></span></span><br> <span style="line-height:150%"><b><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">Results: </span></span></b><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">A weight percentage of 2 % iron chloride</span></span> <span style="line-height:150%"><span new="" roman="" style="font-family:" times="">(III) and an initial ratio of 1:4 of alginate: nanocomposite for Alg/Fe-Clin and a weight percentage of 2 % (1 % sodium hydroxide + 1 % sodium tripolyphosphate) and an initial ratio of 1:3 of chitosan:</span></span> <span style="line-height:150%"><span new="" roman="" style="font-family:" times="">nanocomposite for </span></span><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">CS/Fe-Clin </span></span><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">were chosen as the optimal values. Maximum adsorption efficiency of Alg/Fe-Clin and CS/Fe-Clin adsorbents was determined 88.1 and 92.9 % at dosages of 0.6 and 1 g/L and at initial concentrations of 200 and 300 &micro;g/L, respectively. The </span></span><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">q_max</span></span><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">values for Alg/Fe-Clin and CS/Fe-Clin adsorbents were 11.11 and 10 mg/g, respectively. </span></span><span lang="EN" style="line-height:150%"><span new="" roman="" style="font-family:" times="">Results better fitted with Freundlich isotherm.</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman",serif"></span></span></span><br> <span style="line-height:150%"><b><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">Conclusion:</span></span></b> <span lang="EN" style="line-height:150%"><span new="" roman="" style="font-family:" times="">Due to the </span></span><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">proper </span></span><span lang="EN" style="line-height:150%"><span new="" roman="" style="font-family:" times="">adsorption capacity, both synthesized adsorbents showed the ability to effectively remove arsenic; whoever, alginate binder was more efficient.</span></span><span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:"B Lotus""></span></span></span></span><br> &nbsp;</div> نانوکامپوزیت زئولیتی, آرسنیک, کیتوسان, آلژینات, جاذب گرانولی Zeolite nanocomposite, Arsenic, Chitosan, Alginate, Granular adsorbent 459 480 http://ijhe.tums.ac.ir/browse.php?a_code=A-10-2721-2&slc_lang=fa&sid=1 Maryam Tahmasebpoor مریم طهماسب پور tahmasebpoor@tabrizu.ac.ir Yes Department of Chemical Engineering, Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, Iran گروه مهندسی شیمی، دانشکده مهندسی شیمی و نفت، دانشگاه تبریز، تبریز، ایران Leila Sanaei لیلا ثنایی ail.com@tabrizu.ac.ir No Department of Chemical Engineering, Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, Iran گروه مهندسی شیمی، دانشکده مهندسی شیمی و نفت، دانشگاه تبریز، تبریز، ایران Masoomeh Chaharkam معصومه چهارکام masoomeh4kam@gmail.com No Department of Chemical Engineering, Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, Iran گروه مهندسی شیمی، دانشکده مهندسی شیمی و نفت، دانشگاه تبریز، تبریز، ایران