scholarly journals KEMAMPUAN ADSORPSI KITOSAN UNTUK ION LOGAM TIMBAL (Pb2+) DAN KADMIUM (Cd2+)

2015 ◽  
Vol 2 (1) ◽  
pp. 21
Author(s):  
John Hendri ◽  
Rahmawati ◽  
Aspita Laila
Keyword(s):  
Metal Complex ◽  
Metal Concentration ◽  
Complex Compound ◽  
Adsorption Energy ◽  
Contact Time ◽  
Toxic Metal ◽  
Natural Polymer ◽  
Form Complex ◽  
Adsorption Transition ◽  
Chitosan Molecule

 ABSTRACT Chitosan is natural polymer that has been known to posses the capacity to adsorb various transition metals. This capacity of adsorption is resulted from the ability of chitosan to form complex compound with metal, especially Pb and Cd. The  formation of chitosan-metal complex is enabled by the presence of active hydroxil group in chitosan molecule. The results of this study on adsorption of Pb2+ and Cd2+ revealed the existence of linear relationship between the amount of the metal adsorbed with concentration of the metal tested. It was found that for Pb2+, the maximum adsorption was 10.32 mg/g which was achieved for the metal concentration of 50 mg/L, and 24.998 mg/g for Cd2+ at metal concentration of 100 mg/L. The optimum contact time for adsorption was found to be 24 hours for both metals. The adsorption was found to take place with the adsorption energy of 29.82 kJ/mol for Pb2+ and 17.23 kJ/mol for Cd2+.  Keywords:  chitin, chitosan, adsorption, transition metal, and toxic metal 

The silver–pyrazole electrode and its application to determine the stability of Cd(II), Zn(II), Ni(II), Co(II) pyrazole complexes

1977 ◽  
Vol 55 (2) ◽  
pp. 199-202 ◽  
Author(s):  
Marie-José Blais ◽  
Guy Berthon
Keyword(s):  
Metal Complex ◽  
Metal Concentration ◽  
Stability Constants ◽  
Divalent Metal ◽  
The Stability ◽  
Concentration Ratios

The silver–pyrazole metal-complex electrode was investigated and used to determine free concentrations of pyrazole in the presence of Cd2+, Zn2+, Ni2+, or Co2+ ion, under different pyrazole/divalent metal concentration ratios. The stability constants of the complexes formed between these ions and pyrazole were calculated.

scholarly journals Toxic metal concentration and ecotoxicity test of sediments from dense populated areas of Congo River, Kinshasa, Democratic Republic of the Congo

2020 ◽  
Vol 2 ◽  
pp. 83-90 ◽  
Author(s):  
Henry K. Mata ◽  
Dhafer Mohammed M. Al Salah ◽  
Georgette N. Ngweme ◽  
Joel N. Konde ◽  
Crispin K. Mulaji ◽  
...  
Keyword(s):  
Metal Concentration ◽  
Democratic Republic ◽  
Toxic Metal ◽  
Ecotoxicity Test ◽  
Congo River ◽  
Republic Of The Congo

scholarly journals STUDY OF MULTIELEMENTAL ADSORPTION ON ACTIVATED CARBON

2012 ◽  
Vol 06 ◽  
pp. 121-126
Author(s):  
LE THI XUAN THUY ◽  
MIKITO YASUZAWA ◽  
TOMOKI YABUTANI
Keyword(s):  
Activated Carbon ◽  
Metal Concentration ◽  
Contact Time ◽  
Adsorption Process ◽  
Adsorption Rate

In this study, multielemental adsorption on activated carbon (AC) was investigated. The treatment parameters (pH, AC concentration, metal concentration and contact time) in the adsorption process of multiple metals such as Bi , Cd , Co , Ga , Mn , Mo , Ni , In , Pb , Pd , Sn , Rh , Ru and W were experimented. Three types of characteristic behaviors of analyte elements were observed when the pH was varied. The adsorption rate of Bi , Co , Ga , Ni , In , Pb , Sn , Ru and W were over 80% within 30 min.

scholarly journals DAYA SERAP KULIT KACANG TANAH TERAKTIVASI ASAM BASA DALAM MENYERAP ION FOSFAT SECARA BATH DENGAN METODE BATH

2016 ◽  
Vol 1 (1) ◽  
pp. 52 ◽  
Author(s):  
Irdhawati Irdhawati ◽  
Alling Andini ◽  
Made Arsa
Keyword(s):  
Adsorption Capacity ◽  
Complex Compound ◽  
Contact Time ◽  
Fine Powder ◽  
Ammonium Molybdate ◽  
Activation Process ◽  
Blue Color ◽  
Peanut Shell ◽  
Phosphate Ion ◽  
Acid And Base

AbstrakKulit kacang tanah digunakan sebagai adsorben untuk menyerap ion fosfat dalam larutan. Sebelum digunakan sebagai adsorben, kulit kacang tanah dicuci, dikeringkan, dihaluskan menggunakan blender dan diayak dengan ukuran partikel ≤ 100 mesh. Serbuk halus diaktifkan dengan asam (H2SO4) dan basa (NaOH) pada berbagai konsentrasi. Selanjutnya, adsorben dengan dan tanpa aktivasi digunakan untuk menentukan kadar fosfat yang terserap secara optimum. Parameter adsorpsi yang digunakan adalah waktu kontak dan kapasitas adsorpsi. Kapasitas adsorpsi diukur dengan mereaksikan ion fosfat dengan adsorben, dan sisa analit dalam larutan ditambahkan dengan amonium molibdat membentuk senyawa kompleks amonium fosfomolibdat berwarna biru dalam larutan asam. Konsentrasi senyawa kompleks ditentukan dengan metode spektrofotometri UV-Visible.Hasil dalam proses aktivasi menunjukkan konsentrasi optimum asam adalah 0,05 M, dan basa sebesar 0,5 M. Waktu kontak optimum diperoleh 45 menit untuk adsorben tanpa aktivasi dan aktivasi basa,  sedangkan untuk aktivasi asam 30 menit. Kapasitas adsorpsi optimum berturut-turut adalah  8,5 mg/g; 8,8 mg/g, dan 10,4 mg/g menggunakan adsorben tanpa aktivasi, teraktivasi asam dan teraktivasi basa. Adsorben teraktivasi basa memiliki kapasitas adsorpsi tertinggi dibandingkan adsorben tanpa aktivasi dan teraktivasi asam. Kata kunci: kulit kacang tanah, ion fosfat, adsorpsi, amonium fosfomolibdat  AbstractPeanut shell was used as adsorbent to adsorb phosphate ion in solution. Before using as adsorbent, the peanut shell was washed, dried, mashed and sifted with particle size <100 mesh. The fine powder was activated by acid (H2SO4) and base (NaOH) with various concentrations. Furthermore, the adsorbent with and without activation was used to determine the optimum phosphate concentration that can be adsorbed. The parameters adsorption such as contact time and adsorption capacity, were examined. The adsorption capacity was measured by reacting the phosphate ion with adsorbent, and the rest of analyte in the solution reacted with ammonium molybdate formed ammonium phospho molybdate complex compound whose blue color in acidic solution. The concentration of complex compound can be determined by UV-Visible spectrophotometry method. The results in activation process showed the optimum concentration of acid is 0.05 M, and base is 0.5 M. The optimum contact time obtained 45 minutes for adsorbent without and base activated, while 30 minutes for acid activated. The optimum adsorption capacity is 8.5 mg/g, 8.8 mg/g, and 10.4 mg/g using adsorbent without, acid, and base activated, respectively. Adsorbent in base activated has the highest adsorption capacity compared with no and acid activated. Keywords: peanut shell, phosphate ion, adsorption, ammonium phospho molybdate

scholarly journals THE APPLICATION OF WHEAT BRAN FOR THE REMOVAL OF COPPER IONS FROM POLLUTED WATER

2020 ◽  
Author(s):  
Gideon Masedi Nii Ayi Lomoko ◽  
Dainius Paliulis
Keyword(s):  
Metal Concentration ◽  
Wheat Bran ◽  
Contact Time ◽  
Room Temperature ◽  
Copper Ions ◽  
Polluted Water ◽  
Adsorption Efficiency ◽  
Toxic Heavy Metals ◽  
Solution Ph ◽  
Adsorbent Dose

The purpose of the study underlying the present paper was to determine the adsorption of copper ions which happens to be one of the most important toxic heavy metals in the environment; for that purpose a test was carried out under laboratory conditions using wheat bran as adsorbent. The object of the test was to examine the effect of solution pH, contact time, adsorbent dose and initial copper ions concentration (2 mg/L to 20 mg/L) on adsorption yield and uptake. Three masses of wheat bran (0.5 g, 1.0 g and 2.0 g) were used for this experiment. 1.0 g of wheat bran gave a maximum adsorption efficiency at pH 5.0. At this pH, the adsorption efficiency for initial copper ions concentration of 5 mg/L was found to be 65.8% at room temperature for a contact time of 60 min. The adsorption of copper ions slowly reached equilibrium at 30 mins. With an adsorbent dose of 0.5 g of wheat bran, a maximum uptake of 0.277 mg/g of copper ions was recorded. With increasing mass of adsorbent dose from 0.5 g to 2.0 g. the adsorption uptake of copper ions decreased from 0.273 mg/g to 0.087 mg/g The highest removal efficiency of copper ions was found to be at a metal concentration of 5 mg/L. With the metal concentration increasing the adsorption of copper ions by 0.5 g of wheat bran decreased from 52.0% to 39.9%.

scholarly journals Factorial Design Analysis of Zn(II) Ions Adsorption on Thermally Treated Rice Husk

2015 ◽  
Vol 10 (1) ◽  
pp. 121
Author(s):  
Keat Khim Ong ◽  
A. T. Ahmad Farhan ◽  
W. M. Z. Wan Yunus ◽  
Ahmad Mujahid Ahmad Zaidi ◽  
M. L. Jabit ◽  
...  
Keyword(s):  
Metal Concentration ◽  
Rice Husk ◽  
Contact Time ◽  
Heating Temperature ◽  
Ion Concentration ◽  
Adsorbent Dosage ◽  
Percentage Removal ◽  
Student’S T ◽  
Significant Factors ◽  
Thermally Treated

<p class="zhengwen"><span lang="EN-GB">Adsorption of Zn(II) ions from aqueous solutions by thermally treated rice husk was investigated using factorial experimental design to study effects of heating temperature and period of rice husk, pH, initial Zn(II) ion concentration, adsorption temperature and contact time, and adsorbent dosage. Main and interaction effects of these factors were analyzed using statistical techniques and the results were analyzed statistically using the Student’s t-analysis and analysis of variance which were used to determine significant factors that affect the percentage removal of Zn(II). These significant factors were heating temperature of rice husk, pH, initial metal concentration, contact time, and adsorbent dosage. The interaction between two different effects also affects the percentage removal of Zn(II) ions. These include the interactions between heating temperature of rice husk and initial metal concentration, pH and initial metal concentration, and pH and the adsorbent dosage.</span></p>

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