Abdul Wahid Wahab
Chemistry DepartementFaculty of Mathematics and Natural Sciences Hasanuddin University Makassar 90245

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ANALISIS KANDUNGAN ION TIMBAL DAN SENG PADA KERANG DARAH (Anadara granosa) DI PERAIRAN PELABUHAN PARE-PARE H, Meilanty; Wahab, Abdul Wahid; Hala, Yusafir
MARINA CHIMICA ACTA Vol 6, No 2
Publisher : Universitas Hasanuddin

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Abstract

The research about analysis of concentration of Pb and Zn in Anadara granosa at the territorial waters of Pare-Pare Harbor. The Pb and Zn content was analyzed by using the Atomic Absorption Spectrophotometric Method. The result of analysis indicated that Pb concentration was 13,36 – 23,94 mg/kg in dried weight and Zn concentration was 53,78 – 67,88 mg/kg in dried weight, and the concentration of Pb and Zn was highest in Cappa’ Ujung Harbor. The value of Pb and Zn have exceeded the value float the boundary so that Anadara granosa have improper to be consumed by peoples.   Keywords :  Anadara granosa, Plumbum, Zinc, AAS
ANALISIS KANDUNGAN LOGAM BERAT TIMBAL DAN SENG DI SEKITAR PERAIRAN PELABUHAN PARE-PARE DENGAN METODE ADISI STANDAR Wahab, Abdul Wahid; -, Mutmainnah
MARINA CHIMICA ACTA Vol 6, No 2
Publisher : Universitas Hasanuddin

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Abstract

This research is aimed to find out the content of heavy metal such Pb and Zn in the sediment in around waters of Pare-Pare harbour with standard addition method. Sampling was conducted in four different locations (stations). Heavy metal content was analyzed by using the Atomic Absorption Spectrophotometer (AAS) and analyze  result  measurement  was  done  by  standard adition method.  The  result  of research showed that Pb content in sediment is between 54,3331 - 93,8774 mg/kg of sediment dry  weight and  Zn between 64,9744 - 94,3321 mg/kg of sediment dry weight. According to guide of sediment quality, the waters condition in around of Pare-Pare harbour has been contaminated by    Pb and Zn metals. Keywords : standard addition, sediment, plumbum, zink
EKSTRAKSI LOGAM BERAT Cd DAN Cu DALAM SEDIMEN LAUT DANGKAL DENGAN BEBERAPA KOMBINASI ASAM MINERAL Nafie, Nursiah La; Wahab, Abdul Wahid; Malik, Abdul
MARINA CHIMICA ACTA 1999
Publisher : Universitas Hasanuddin

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Abstract

Sampling preparation and appropriate choice of analytical method are two important points to consider in obtaining reliable data on toxic metal analysis in marine environment. This work aims to know the quality of two or three acid combinations in metal extraction of Cd and Cu in marine sediment as preliminary steps in sampling preparation. The result was tested through its effectiveness and accuracy by looking at its quantitative aspect and relative standard deviation. Determination of Cd and Cu was carried out by Attomic Absorption Spectroscopy and the result has shown that combination of HCl/HNO3/HClO4 is having best effectiveness and accuracy. The amount of extract obtained are 13.16 ug/g for Cd and 74.93 for Cu. Deviation standards for Cd and Cu are 1.23% and 0.58% respectively.   Key words : extraction, marine sediment, toxic metal, effectiveness, accuracy, deviation standard
Effect of Medium Contaminated Pb and Cu toward the Growth Ofnannochloropsis Salina Wahab, Abdul Wahid; Hala, Yusafir; Fibiyanthy, .
MANASIR Vol 1, No 1 (2013): April 2013
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat Universitas Hasanuddin

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Abstract

This research was conducted with the aim of utilizing phytoplankton Nannochloropsis salina as biosorbent for Pb and Cu metal ions pollutant in water. In this study, exposure to Pb and Cu metal ions with various concentrations of each of 10, 30, and 50 ppm conducted at the beginning of the growth of N. salina in Conwy Medium at 30‰ salinity, aeration and continuous illumination, as well as room temperature 20 °C. Metals ion concentration was determined by atomic absorption spectrophotometer (AAS). Optimum growth of N. salina as a control obtained on day 8th, while the growth of N. salina after exposure the metal ions showed very low population in the initial contact. Trend of growth increases with contact time of N. salina with metal ions. The metals ion adsorption efficiency of Pb and Cu by N. salina inversely with increasing contact time.
Application of TiO2 Nanotube As Photoelectrode For Corrosion Prevention Of Stainless Steel In pH Variation of NaCl Misriyani, Misriyani; Wahab, Abdul Wahid; Taba, Paulina; Gunlazuardi, Jarnuzi
Indo. J. Chem. Res. Vol 3 No 1 (2015): Edisi Bulan Juli (Edition For July)
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

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Abstract

The research amis to synthesize TiO2 nanotube photoelectrode (TiO2-NT) by anodizing method. The photoelectrodes applied in photoelectrochemical system to prevent the corrosion of steel. Anodizing method carried out by preparing an electrochemical system consisting of a titanium plate as anode and Pt wire as cathode in electrolyte containing glycerol, ammonium fluoride and water. Voltage applied from the DC current source and followed by thermal treatment at a temperature of 500oC. The photoelectrode further characterized by using X-Ray Diffraction and Surface Area Analyzer. The result of anti-corrosion test of stainless steel 304 by TiO2-NT showed that photopotential value of steel shifted to the more negative value in UV light. The significant potential shift occurs at pH 8 and the corrosion rate of stainless steel 304 couple with TiO2-NT decrease reaches 1.7 times. It concluded that the photoelectrodes can be used to reduce the corrosion rate of stainless steel 304 by utilizing sollar energy as a source of UV light.
Effect of Anodizing Time and Annealing Temperature on Photoelectrochemical Properties of Anodized TiO2 Nanotube for Corrosion Prevention Application Misriyani, Misriyani; Wahab, Abdul Wahid; Taba, Paulina; Gunlazuardi, Jarnuzi
Indonesian Journal of Chemistry Vol 17, No 2 (2017)
Publisher : Universitas Gadjah Mada

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Abstract

A study on the influence of anodizing time, annealing temperature and photoelectrochemical properties of TiO2 nanotube (TiO2 NT) has been investigated. The crystallinity was investigated using X-Ray Diffraction and the anti-corrosion performance of stainless steel 304 (SS 304) coupled with TiO2 NT was evaluated using electrochemical techniques under ultraviolet exposure. The optimum anodizing condition occurs at a voltage of 20 V for 3 h. After anodizing, the TiO2 NT amorf was calcined at 500 °C to obtain anatase crystalline phase. For the photoelectrochemical property, the effects of pH and NaCl concentration on corrosion prevention have been examined. The result showed that the corrosion rate of stainless steel 304 coupled with TiO2 NT can be reduced up to 1.7 times compared to the uncoupled stainless steel 304 (3.05×10-6 to 1.78×10-6 mpy) under ultraviolet exposure by shifted the photopotential to the more negative value (-0.302 V to -0.354 V) at a pH of 8 and 3% NaCl concentration (-0.264 V to -0.291 V). In conclusion, the TiO2 NT films, which was prepared by anodization and followed by annealing can prevent the corrosion of stainless steel 304.
Pengaruh Ion Kadmium(II) dan Nikel(II) pada Ekstraksi Ion Tembaga(II) dengan Ekstraktan 4-Benzoil -1-Fenil-3-Metil- 2- Pirazolin-5-On Menggunakan Emulsi Membran Cair Hamzah, Baharuddin; Jalaluddin, Noor; Wahab, Abdul Wahid; Upe, Ambo
Jurnal Natur Indonesia Vol 13, No 03 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

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Abstract

The effects of cadmium(II) and nickel(II) ions to copper(II) extraction using liquid membrane emulsion with 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-on (HPMBP) as an extractant was studied. The optimum condition forcopper(II) extraction were as follows: emulsification rate=2000 rpm, emulsification time=10 minutes, extractionrate=300 rpm, extraction time=15 minutes, concentration of mixed surfactant (span 80+span 20)=3%, volumeratio of membrane phase and internal phase=1:1, concentration of HPMBP=0.020 M, concentration of HCl=1M,volume ratio of emulsion and external phase=1:7. The result showed that the extraction of copper(II) by liquidmembrane emulsion with HPMBP as an extractant was selective to cadmium(II) and nickel(II) ions, relatively. Theresult also showed that in the extraction of 500 mg/l copper(II), the presence of 500 mg/l of nickel(II) was decreasingthe percentage of copper(II) extraction to be 83.73. While, the presence of 500 mg/l of cadmium(II) does notinfluence the percentage extraction of copper(II), relatively.
Pengaruh Metode Sintesis Silika Mesopori SBA-15 terhadap Analisis Differential Scanning Calorimetry dan Pengukuran Low Angles X-Ray Diffraction Ridhawati, Ridhawati; Wahab, Abdul Wahid; La Nafie, Nursiah; Raya, Indah
INTEK: Jurnal Penelitian Vol 5, No 1 (2018): April 2018
Publisher : Politeknik Negeri Ujung Pandang

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Abstract

Mesoporous silica SBA-15 is an interesting material having highly ordered nanopores and large surface area, which is synthesized by sol gel and hydrothermal methods. In this study, mesoporous silica SBA-15 was synthesised with two different methods and the characteris was using X-Ray Diffraction (XRD) and Differential Scanning Calorimetry (DSC). SBA-15 was prepared TEOS as precursor and Pluronic 123 as surfactant. Thermoporous mesoporous DSC thermogram results of the SBA-15A mesoporous silica is (Tg 79oC and Tc 158oC). This is relatively lower than SBA-15B (Tg 86oC and Tc 158oC). The measurement of low angle X-Ray Diffraction SBA-15A has a crystal size 9.46 nm and SBA-15B has a crystal size 9.96 nm. The synthesis of SBA-15 using the hydrothermal method needs to be studied further to obtain thermal characteristics and a more stable crystal structure
Synthesis and Structural Analysis of Magnesium Oxide Nanomaterial Using Ethanol as Polymerization Solvent Sutapa, I Wayan; Wahab, Abdul Wahid; Taba, Paulina; La Nafie, Nursiah
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 4, No 2 (2019): June 2019
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

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Abstract

The purpose of the study was to synthesize MgO nanomaterials using sol-gel method with ethanol as solvent and to perform structural analysis of the products. Mg-oxalate was initially prepared prior magnesium acetate. Magnesium acetate dissolved in ethanol, and the oxalic acid added to adjust pH until gel phase formed. The gel was heated at 100 C for 24 hours to produce magnesium oxalate solids. Solids was sieved using ±150 mesh then annealed at 550 C for 6 hours to produce MgO nanomaterial. The magnesium oxalate was characterized using FT-IR, XRD, and SEM. FT-IR peak at 3408.22 cm-1; 1709.35 cm-1; 1375.39 cm-1; 830.32 cm-1; 420.48 cm-1, and the XRD peak 17.95o; 22.97o; 25.02o; 27,94o; 35.10o; 37,63o; 44.16o were characteristic of Mg-oxalate. Meanwhile, FT-IR band at 1030.24 cm-1; 2358.94 cm-1; 1627.92 cm-1; 1417.66 cm-1; 437.84 cm-1, and XRD peak at 38.92o; 43.3o; 56.02o; 62.64o; 74.88o and 79.04o shows characteristic of MgO nanomaterial. Structure analysis shown the MgO nanomaterials has an average crystal size 8.11 nm, and lattice length 21.21 nm. The values of strain, stress, energy density crystal and dislocation density of the MgO are 5.3 x 10-5 MPa, 32.97 MPa, 154.81 J/nm2, 1.52 x 10-3 nm-2 respectively. Morphologically the MgO nanomaterial produced is cubic.
Synthesis and Characterization of TiO2 Nanoparticle as Adsorbent on The Treatment of Methylene Blue Dye Pollutant Thahir, Ridhawati; Wahab, Abdul Wahid; Nafie, Nursiah La; Raya, Indah
Jurnal Rekayasa Kimia & Lingkungan Vol 14, No 1 (2019): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

The dye of methylene blue (MB) is organics pollutant from chemical industries. The parameter of MB content are available as methylene blue active substance (MBAS) do not exceed 200 µg/L.  The treatment of MB dye pollutant can be done by adsorption process with TiO2 nanoparticle. This aim of this research was synthesized of TiO2 nanoparticle using PVA as surfactant and titanium tetraisoproxide (TTIP) as titanium source through sol-gel preparation to hydrothermal process at temperature 400 and 600oC. The result of XRD spectrum was shown the tetragonal crystal, the phase of anatase, and the size of particle was 1.66 to 3.15 nm. Infrared spectroscopy of Ti-O functional group was at 467 cm-1 and there were hydroxyl groups of the surface TiO2. DSC analysis was indicated the thermal stability of TiO2 at 250oC. Application of TiO2 nanoparticle as an adsorbent to photodegradation of MB with Hg lamp 150 watt during 60 minutes. The highest of adsorption capacity at the sample TiO2-600 was 217 mg/g and effectiveness adsorption was 81%. Isoterm adsorption process of MB by TiO2 nanoparticle can be obtained with Langmuir and Freundlish equation, with the determined coefficient value were close to 1. These results suggest of TiO2 nanoparticle was indicated highly potential to apply for the treatment of pollutant industries.