Removal of cadmium (II) ion from wastewater using natural and modified myrtus communis leaves

A new simple method was developed for the removal of cadmium ions from wastewater by using natural and modified dried leaves of myrtus communis. The effects of varying adsorbent weight, hydrogen ion concentration, contact time and temperature of adsorption were studied. Optimal conditions were obtained (pH was6, weight of adsorbent was2g, particle size was 300μm, temperature was25°c, contact time was 90 minute and concentration of cadmium ions was 10 mg / L)., in order to compare the results obtained from the natural and modification experiments. The result showed that the natural adsorbent gave about 78.12 % removal for Cd(II) at a pH of 6.0 while KMnO4 modified adsorbent gave 98.06 % removal for Cd(II) at the same conditions. The equilibrium data for the adsorption of cd(II) ion on myrtus communis leaves tested using the Freundlich, Temken and Langmuir adsorption isotherms. The Langmuir isotherm was observed more suitable for Cd(II) adsorption on natural myrtus communis leaves, while The Freundlich isotherm was found to be more suitable for Cd(II) adsorption on modified myrtus communis. To evaluate the mechanism of adsorption, pseudofirst order and second order kinetic models were used. The adsorption mechanism was found fit the second order. The thermodynamic parameters were given and showed that ΔH° was endothermicpositive value, ΔG° was found (a spontaneous process-negative value) and ΔS° was found positive value-in KMnO4 modified adsorbent while ΔH° was exothermic-negative value, ΔG° was found (a spontaneous process-negative value) and ΔS° was found negative value on natural myrtus communis. FTIR was used to identify the activity of adsorption process. تهدف الدراسة إلى إيجاد طريقة بسيطة لإزالة أيونات الكادميوم من مخلفات المياه الصناعية (التي تحوي معقدات الكادميوم) باستعمال مسحوق الأوراق المجففة الطبيعية و المعدلة من نبات الياس (Myrtus Communis). تم دراسة الظروف المثالية لعملية الإزالة ( 6 = pH، وزن المادة المازة = 2gm، الحجم الحبيبي =µ m 300، درجة الحرارة = °25 C، زمن التماس 90min =، و التركيز الابتدائي لايونات الكادميوم = 10 mg / L ). تم تطبيق هذه المعطيات على عينات ذات تركيز (50 mg / L) و كانت كفاءة الإزالة بنسبة (% 78.12 ) باستخدام النبات الطبيعي و بنسبة (% 98.06) باستخدام النبات المعدل بمحلول .KMnO4 أثبتت الدراسة الايزوثيرمية انطباق نموذج Langmuir للايزوثيرم في حالة استخدام مسحوق النبات الطبيعي، لكن نموذج Freundlich كان الأكثر انطباقا في النبات المعدل. درست حركيات التفاعل بتطبيق قانون المرتبة الأولى الكاذبة إضافة إلى قانون المرتبة الثانية للتفاعل