Potensi Arang Aktif dari Tulang Sapi sebagai Adsorben Ion Besi, Tembaga, Sulfat dan Sianida dalam Larutan

Chemically the composition of cow bones preparation consist of 69% of inorganic phase, 22% of organic phase and 9% water. The organic phase of bone contains 90% collagen. Therefore, the organic phase of cow bone can be used as a source of carbon that functions as the active charcoal bone. Active charcoal cow bones made of carbonization and activation process, using activator Na2CO3 with variation concentration of 2.5%; 5% and 7.5%. In this study, the active charcoal cow bones with the variation of concentration are characterizated and obtained the optimum concentration of Na2CO3 at concentrations of 5% to 7.99% of moisture content, 13,33% of ash content, 27,164 m2/g of methylene blue adsorption and 184, 6947 mg/g of iod adsorption. The active charcoal cow bones with Na2CO3 5% was utilized to adsorp ions of iron (SNI 6989-4-2009), copper (SNI 6989-6-2009), sulfate (SNI 06-2426-1991) and cyanide (SNI 6989-76-2011) in solution for 24 hours with variations of the concentration of 100, 200, 300, 400, 500 and 600 mg/L. Ions of iron and copper were analyzed using an Atomic Absorption of Spectrofotometer (AAS), while ions of sulphate and cyanide analyzed using a Spectrofotometer UV-VIS. The Optimum adsorption ability of active charcoal cow bones is 99,9624% of the iron ions at a concentration of 300 mg/L, copper ions at 99,6484% that obtained at a concentration of 200 mg/L, sulfate ions at 68,274% and 69,594% of cyanide ions at a concentration of 200 mg/L

Potensi Abu Cangkang Kerang Darah (Anadara Granosa) sebagai Adsorben Ion Timah Putih

The waste of blood clam seashells (Anadara granosa) can be used as adsorbent of tin.Blood clam seashells was calcinated at 800 0 C of ±9 hours. Blood clam seashellscontained CaO . The aim of this study was to see potential of blood clam seashell ash asabsorbent of tin. The research was conducted by contacting was tin ion and blood clamseashell ash with the variation of concentration. Tin analysis performed by using atomicabsorption spectroscopy (AAS). The results showed that optimal absorption occurs at30 mg/L, at 15 hours was 66,53%

Potensi Arang Aktif Tulang Sapi sebagai Adsorben Ion Timbal, Kadmium, Nitrat dan Klorida dalam Larutan

Cow bone can be used as raw material of craft. Based on the development of science and technology cow bone can be utilized for many purposes, for example, it could be as an adsorbent. Cow bone can also be used as an activated charcoal, because bone contains about 35% of organic compounds. Activated charcoal was made of cow bone through carbonization and activation processes. The activation process used Na 2 CO 3 as an activator which the concentration is 2,5%, 5% and 7,5%. In this experiment, activated carbon of cow bone was used to adsorbed is cadmium, lead, nitrate and chloride ions in solution. Cadmium and lead were analyzed using atomic absorption spectrophotometer (AAS), while chloride was analyzed using Argentometry Mohr method and nitrate was analyzed using Brusin Sulfate method. The adsorption capacity of the activated charcoal cow bones to cadmium, lead, nitrate and chloride ions are 99.9643%, 99.9481%, 90.5885% and 10.145% respectively

Penerapan Model Problem Based Learning (Pbl) untuk Meningkatkan Kemampuan Pemecahan Masalah Matematis Siswa Kelas X2 SMA Negeri 1 Tanah Merah

This research is a class action research that aims to improve thelearning process and to improve the student\u27s mathematical problem solving ability byapplying Problem Based Learning (PBL). The subjects of this research are the studentof class X2 Senior High School 1 Tanah merah at first semester of academic years2015/2016, which amounts to 29 students. This research consists of two cycles, eachcycle consists of four stages: planning, implementation, observation, and reflection.Data collected through observation and student\u27s mathematical problem solving abilitytest. Data analysis is done by observation data analysis and student\u27s mathematicalproblem solving ability data analysis. The action is successful if the scores of teacher\u27sactivities and student\u27s activities increase in every meeting, improve the student\u27smathematical problem solving ability every cycle and improve the classical\u27smathematical problem solving ability. The result of observation show teacher andstudents activities are improve better than before in every meeting. Based on dataanalisys of student\u27s mathematical problem solving ability test show the average N-gainof student\u27s mathematical problem solving ability in first cycle has improve 0,26, itsmean the student\u27s mathematical problem solving ability in low classification and insecond cycle the average N-gain of student\u27s mathematical problem solving ability hasimprove 0,39, its mean the student\u27s mathematical problem solving ability in mediumclassification. The average score of classical\u27s mathematical problem solving abilityhas improve 31,46 in first cycle than beginning test and the average score of classical\u27smathematical problem solving ability has improve 6,15 in second cycle than first cycle.The result of this research showed that Problem Based Learning improve the learningprocess and increase the the student\u27s mathematical problem solving ability of class X2Senior High School 1 Tanah merah at first semester of academic years 2015/2016

Preparation and Characterization of Polymer Electrolyte of Glycidyl Methacrylate-Methyl Methacrylate-LiClO 4

In the present investigation, we study the properties of the plasticized polyglycidyl methacrylate P(GMA) copolymerized with polymethyl methacrylate P(MMA)-LiClO4 polymer electrolyte prepared by solution casting technique. The electrolyte was characterized using impedance spectroscopy (EIS), Fourier transforms infrared (FTIR), cyclic voltammetry (CV), and X-ray diffraction (XRD). The conductivity was improved from 1.3×10−12 S cm−1 to 8.7×10−6 S cm−1 upon the addition of 25 wt.% LiClO4 salt into P(GMA-MMA). The conductivity was improved from 1.4×10−6 S cm−1 to 3.0×10−4 S cm−1 upon the addition of 80 wt.% EC into P(GMA-MMA)-LiClO4 The band that belongs to C–O–C is shifted farther than the band of C=O upon the addition of LiClO4 into P(GMA-MMA). The band of C–O–C stretching is shifted to lower wavenumber upon the addition of EC into P(GMA-MMA)-LiClO4. Upon the addition of EC into P(GMA-co-MMA), the intensity of the peaks decreases, implying the amorphous nature of the electrolyte increases with the concentration of the plasticizer. The electrolyte is electrochemically stable at 3.8 V, making it suitable for dye-sensitized solar cell application

Analisis Kandungan Logam Timbal, Kadmium dan Merkuri dalam Produk Krim Pemutih Wajah

Whitening cream is a mixture of chemicals or other materials which is able to whiten the skin. The presence of heavy metals such as Pb, Cd and Hg in the whitening cream products are very dangerous, because if the heavy metal ions adsorbed into organs, it will cause health problems. This study aims to determine the metal content of lead, cadmium and mercury in the whitening cream products. The sample of whitening cream which is used in this study consists of day cream and night cream. 6 samples ( 3 of daycream and 3 of night cream) were purchased randomly in Pekanbaru market to be analyzed by using atomic absorption spectrophotometer. The result of the study showed the highest contentof Pb was seen in the sample of day whitening cream with values of C134,91 μg/g and the highest content of Cd was seen in the sample of night whitening cream with values of C21,55 μg/g while the highest content of Hg was shown by the sample of night whitening cream with values of B24,18 μg/g. All the results are above the safe limit determined by the National Agency of Drug and Food Control of the Republic of Indonesia BPOM RI No. HK 03.1.23.08.11.07331 tahun 2011