Bayu Wiyantoko

Improving the quality of patchouli oil by adsorption process using surfactant modified of natural zeolite

This research concerns with the development of natural material i.e. natural zeolite. Natural zeolite were modified by surfactant treatment. Material modification has been done using cetyltrimethyllammonium bromide as cationic surfactant for mesopore template. The physicochemical characters of natural material modified and unmodified was investigated by using XRD, FTIR, nitrogen physisorption, and SEM-EDX. The XRD was used to show crystallinity structure of natural material modified and unmodified. Surfactant treatment caused decreasing crystallinity of natural zeolite. The FTIR spectra showed characteristic peaks for natural zeolite modified and unmodified, the bands around 3400-3500 cm−1 and 1635-1641 cm−1 correspond to adsorbed water and bands around finger print area were characteristic for silica and alumina. Meanwhile physisorption nitrogen profiles gave information that the pore modification by surfactant. The morphologies of natural material modified and unmodified as well as chemical composition ...

Phenolic removal using phenylamine modified montmorillonite

Synthesis, characterization, and application of phenylamine modified montmorillonite have been studied. Preparation of phenylamine modified montmorillonite was conducted by intercalation process using simple amine compound. The changes in physical and chemical properties were observed through the crystal structure, functional groups and acidity as well as the application as an adsorbent for phenolic compound. The diffractogram showed characteristic basal spacing of montmorillonite at 2θ = 7.0710° and 19.8856°, also peaks with sharp intense around 20-30° were 2θ = 28.6181° and 35.0112°. The reflection pattern of phenylamine modified montmorillonite exhibited the shifting of d001 basal spacing at 2θ = 7.0710° into 7.1624° that implied the phenylamine was attached to the surface of montmorillonite. The spectra of FTIR gave the difference of wave number for –OH stretching, -OH bending also Mg-O-Al vibration that distinguished between natural montmorillonite and prepared material. The prepared material has low...

Cetyltrimethyl ammonium bromide-Mg/Al hydrotalcite for removal phenol in water

Hydrotalcite materials was synthesized by using Cetyltrimethyl Ammonium Bromide (CTAB) and Mg/Al layered double hydroxide with ratio molar 3:1. Synthesis of CTAB-Mg/Al hydrotalcite was carried out using ex situ co-precipitation method at pH 10±0.5. Removal of phenol was optimum at medium pH 6 and it had optimum contact time in 300 min. It followed pseudo second order with adsorption rate constant was 1.15·10−4 mM-1·min−1. The maximum adsorption capacities obtained from the Langmuir model was 35.71 mg·g−1 at room temperature.

Utilization of natural indicators for borax identification in the Indonesian tofu

Borax has been found in food products i.e. on the Indonesian Tofu that is often consumed by people. Generally, the identification of borax in food products hard to do by the public. Indicators of natural materials will allow the public to identify the presence of borax in food easier. Qualitative test for borax on Indonesian Tofu showed purple cabbage and sappanwood are the effective natural indicators. The result of determining borax on Indonesian Tofu indicated natural indicator from purple cabbage had the smallest correction factor (with conventional indicators PP) about 4.8%. The results of the validation method for purple cabbage indicator in acid-base titration showed that the purple cabbage indicator is homogenous but unstable. The natural indicators of purple cabbage could not be used again after three days of extraction time based on the results of control chart.

The effect of aging temperature on natural zeolite modification

This study investigated the effect of aging temperature on the development of natural zeolite. Natural zeolite was modified by surfactant treatment using cetyltrimethylammonium bromide as the cationic surfactant for mesopore template. Characterization materials used XRD, FTIR and nitrogen physisorption. XRD diffractograms showed variations aging temperature caused the crystallinity and mesopores structure of natural zeolite (MZ). All FTIR spectra showed the presence of silanol and siloxane in the sample MZ and modified of natural zeolite (MMZ). It is proved that all the samples MZ and MMZ on any variation is economical silica-based material. Meanwhile, physisorption nitrogen profiles gave information that the addition of aging temperatures increased the surface area of the modified material but at a temperature of 100°C, the surface area of MMZ becomes smaller due to the water loss system.

Verification of spectrophotometric method for nitrate analysis in water samples

The aim of this research was to verify the spectrophotometric method to analyze nitrate in water samples using APHA 2012 Section 4500 NO3-B method. The verification parameters used were: linearity, method detection limit, level of quantitation, level of linearity, accuracy and precision. Linearity was obtained by using 0 to 50 mg/L nitrate standard solution and the correlation coefficient of standard calibration linear regression equation was 0.9981. The method detection limit (MDL) was defined as 0,1294 mg/L and limit of quantitation (LOQ) was 0,4117 mg/L. The result of a level of linearity (LOL) was 50 mg/L and nitrate concentration 10 to 50 mg/L was linear with a level of confidence was 99%. The accuracy was determined through recovery value was 109.1907%. The precision value was observed using % relative standard deviation (%RSD) from repeatability and its result was 1.0886%. The tested performance criteria showed that the methodology was verified under the laboratory conditions.