Browsing by Author "Amri, T. A."
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Item EFEKTIFITAS LEMPUNG CENGAR SEBAGAI KOAGULAN CAIR DALAM PENJERNIHAN AIR GAMBUT(2013-05-20) Hamid, A.; Muhdarina; Amri, T. A.Cengar clay has been used as a basic material for getting a liquid coagulant. Based on the content of Al and Fe which were given, three types of liquid coagulants were selected to use in coagulation process for decreasing the turbidity and total dissolved solid of peat water. The three types of liquid coagulants selected were the coagulant with cation content 28,118 mg/L for Al and 26,818 mg/L for Fe which called liquid coagulant of Al>Fe, the coagulant with cation content 29,368 mg/L for Al and 29,993 mg/L for Fe which called liquid coagulant of Al≈Fe and the coagulant with cation content 23,926 mg/L for Al and 34,993 mg/L for Fe which called liquid coagulant of AlFe coagulant, 3 NTU and 133 mg/L for Al≈Fe coagulant and 3 NTU and 24 mg/L for AlItem ISOTERMA DAN TERMODINAMIKA ADSORPSI KATION PLUMBUM(II) PADA LEMPUNG CENGAR TERAKTIVASI ASAM SULFAT(2013-07-30) Johan, A.; Muhdarina; Amri, T. A.This research studied isotherm and thermodynamic adsorption of Pb(II) on sulfuric acid activated Cengar clay. Cengar clay was activated by various moles of sulfuric acid (0.2, 0.4 and 0.6 mol). The adsorption process of Pb(II) on the sulfuric acid activated Cengar clay was observed under batch system at various of Pb(II) concentration and temperature for 90 minutes. The observed data was analyzed with isotherm and thermodynamic. The research results showed the adsorption model of Pb(II) on all of the sulfuric acid activated Cengar clay accordance with Freundlich isotherm. Furthermore, adsorption process of Pb(II) on the Cengar clay activated by 0.2 moles of sulfuric acid occurs with endothermic, where ∆H 29,672 kJ/mol, ∆S 116,063 J/molK and ∆G - 5,784 kJ/mol, respectively.Item KARAKTERISASI LEMPUNG CENGAR TERAKTIVASI ASAM SULFAT(2013-07-19) Nurpiyenti; Muhdarina; Amri, T. A.Sulfuric acid activated Cengar clay was a side product of liquid coagulant. It was obtained by calcination of the Cengar clay at 500 oC for 3 hours and then extracted with sulfuric acid with varying moles (0,2 ; 0,4 and 0,6) at 30 oC for a hour and filtered. The sulfuric acid activated clay solid then was calcined again at temperature of 230 oC for 5 hours. The sulfuric acid activated Cengar clay was characterized to identify the mineral types and Si/Al ratio. Characterization by x-ray diffraction (XRD) have generated a new mineral of bassanite at every moles of sulfuric acid, whereas the types of clay mineral that only calcined at 500 oC for 3 hours (LC500) are kaolinite, muscovite, monmorilonite, and calcite. Meanwhile, the Si/Al ratio in every sulfuric acid activated clays LC0,2, LC0,4 and LC0,6 are 1,56, 2,93 and 3,18, respectively, while the LC500 is 1,69.Item PENYARINGAN SULFAT DAN SULFIDA AIR SUNGAI SIAK MENGGUNAKAN KOMPOSIT KARET ALAM/ARANG AKTIF/PASIR COR UNTUK MENGHASILKAN AIR BERSIH(2013-07-30) Silaban, B. B.; Amri, T. A.; ErmanWater is a source of life. Liquid waste goes into the river body can cause a negative impact on the quality of river water. The advantage of sulfate and sulfide content can be toxic to humans. To reduce sulfate and sulfide content to look for the exact method. Composite screening can reduce sulfate and sulfide content of the river water. In this study, composite made from natural rubber as a matrix and active charcoal and cast sand as filler. Filler is used by 5% of the total rubber used. Composites made with filler comparison between active charcoal with sand cast, namely: 0: 100, 50: 50, and 100: 0. Composite with comparison of active charcoal : sand cast = 100: 0 has a efficiency largest in reducing concentrations of sulphate and sulphide to sulphate that is 24,952% and 11,519% for sulfide. In general, the more active charcoal content in the composite the greater the effectiveness of sulfate reduction and sulfide content. The information get from this research are very useful from to solve the problems in the river water and utilization of materials that have not been on used optimal.Item STUDI KESETIMBANGAN ADSORPSI Cu (II) PADA LEMPUNG DAERAH PALAS YANG DIAKTIVASI DENGAN NATRIUM HIDROKSIDA (NaOH)(2013-08-01) Saragih, O.; Erman; Amri, T. A.Copper (Cu) is one pollutant that becomes a problem because it is toxic and is classified as a hazardous waste material so that the presence of this metal in the aquatic environment should be reduced by adsorption. Adsorbent used commonly is activated carbon, seaweed , sugar cane waste and other materials. Clay is a natural mineral which is cheap and readily available as well as a porous material with a large surface area and cation in it that can be interchanged so that it can be used as an adsorbent. Power low adsorption of natural clays can be improved by physical and chemical activation. In this study, use of natural clays from Palas activated with NaOH 2M soaked for 8 hours at a temperature of 105 ± 4oC and calcined at 400o C for 3 hours. Clay activation results were used to adsorb Cu based on the influence of contact time, concentration, temperature, pH and adsorbent weight to study the adsorption equilibrium. The method used is a batch reactor and the filtrate obtained was analysed with Atomic Absorption Spectroscopy (AAS). The results showed that the model can represent equlibrium Langmuir adsorption of Cu (II) on clay which is activated with NaOH. It can be seen from the coefficient of determination (R2), that models Langmuir is higher (0.950) than Freundlich (0.931. Exothermic reaction occurs on adsorption clay activation by the value of ΔH = -7,851kJ / mol and ΔS = -42,85J / mol K. Gibss free energy (ΔG) which is positive value 5,131 kJ /mol hence it can be concluded that the reaction is not spontaneous.