ANALISIS SEBARAN LOGAM BERAT PADA ALIRAN AIR DARI TEMPAT PEMBUANGAN AKHIR (TPA) SAMPAH AIR DINGIN

Final Disposal of waste at Air Dingin Padang City using open dumping system is expected to negatively affect the groundwater and surrounding waterways. Research on the content of heavy metals in landfill water flow in the Air Dingin were made in 2 (two) times that were before the rain and after the rain, then the results were compared with the applicable standard. The content of heavy metals Pb, Cu, Zn, Cd and Mn in Final Disposal (TPA) of waste at Air Dingin Padang City were 0.01-0.17 mg/L,  0.005-0.025 mg/L, 0.0-0.7254 mg/L,  0.0-0.011 mg/L, dan  0.0-0.966mg/L. Pb concentration exceeded the quality standard KEPMEN LH 51 in 1995 leachate pond, while the flow of water and monitoring wells Pb metal content exceeds the quality standards PP.RI.No.82 on 2001 and Mn outlet river  exceeds the quality standards PP.RI.No.82 on 2001. In population of all heavy metals well below the quality stanadard PP.RI.No.82 on 2001. The content heavy metals was affected by the distance of the location of waste, the pH value and after of the rain water around the landfill waste

SENG OKSIDA (ZnO) SEBAGAI FOTOKATALIS PADA PROSES DEGRADASI SENYAWA BIRU METILEN

 ABSTRACT A research aimed to study the influence of ZnO white powder on photodegradation of methylene blue using Merkuri lamp (l = 365 nm) as light source have been reached. A suspension of ZnO (40 mg) mixed with 25 mL of methylene blue solution (initial concentration of 0.015 mM) then was illuminated for 60 minutes showed degradation and quantum yield amounting 23.84% and 3.55 molecules photon-1, respectively. These results mean that by using ZnO as photocatalyst there is about four times efficiency than the one without ZnO either in case of time consumed or the number of photon applied. In kinetic study, it has been observed that such semiconductor-catalyzed photochemical reaction obeys the first order rule where rate constant and half time consecutively were 0.0029 minute-1 and 231 minutes.  Keywords : photodegradation, photocatalyst, quantum yield, semiconductor, photochemical reaction

PEMBUATAN SEL SURYA TERSENSITASI ZAT WARNA MENGGUNAKAN EKSTRAK KELOPAK BUNGA ROSELLA (Hibiscus sabdariffa) DAN KULIT MANGGIS (Garcinia manggostana)

Vol 5 No 1ABSTRACT The roselle flower and mangosteen pericarp dyes were applied as dye sensitizer for dye-sensitized solar cell. The solar cell was composed of a thin film TiO2 as working electrode, 2B pencil as controle electrode, and I-/I3- as electrode couple. The influence of dipping time of working electrode in dyes extract on the cell efficiency was investigated. The highest efficiency of roselle and mangosteen dye-sensitized solar cells was obtained at 60-minutes dipping, respectively as 0.017% and 0.032%. Characterization of both dyes extract by UV-Vis Spectrophotometry method showed that dyes adsorb in visible region. Keywords: Solar cell, sensitized, dyes, antosianin, TiO

Implementation of Building Construction Prohibition In Watershed (Case Study on Brantas Watershed in Soekarno-Hatta Area, Malang)

The objective of research was aims to find, analyze and understand the policy implementation of the ban on construction of building in watershed (DAS Brantas Case Study on Region Soekarno-Hatta Malang). The legal analysis is focused in finding the limiting factors in the enforcement of the ban on construction of the building in the watershed, the legal consequences of the construction of the building in the watershed area and the efforts to enforce the provisions on the prohibition of building in the watershed. The journal is prepared by the method of empirical juridical approach sociological jurisdiction. Based on the survey results revealed that basically factors which hinder the enforcement of the ban on construction of the building in the watershed occurs because Due to the lack of public awareness regarding the building was required to have a permit, factors of weak local economy, the law enforcement officers who are not firmly against the demolition in the area of ​​watershed Brantas also because of the buildings that have stood prior to Regulation No. 1 Year 2012 Malang. The legal consequences of the construction of the building in the watershed area, namely a written warning and a call to the offenders concerned. While efforts to enforce the provisions of the ban on building in the watershed of them with socialization related rules and if there is a violation, the violator will be called to give advance warning letter, if it is still in violation will be given sanction by misdemeanor

PEMBUATAN LAPISAN TIPIS TiO2 -DOPED LOGAM M (M= Ni, Cu dan Zn) DENGAN METODA DIP-COATING DAN APLIKASI SIFAT KATALITIKNYA PADA PENJERNIHAN AIR RAWA GAMBUT

 ABSTRACT Preparation of TiO2-doped M (M = Ni, Zn and Cu) has been prepared on glass substrate using dip-coating technique. Titanium isopropoxide (TIP), Ni(OAct)2.4H2O, Zn(OAct)2.2H2O dan Cu(OAct)2 were used as starting materials and diethanolamine (DEA) as additive in isopropanol solution. Solutions were prepared by mixing of various concentration of metals (1, 3 and 5 mol %)  in 0.5 M TIP solution. Thin films were performed by immersion of glass substrate into solution by withdraw speed of 20 cm/min. Coated glass were dried at 100 – 110°C and heated at 500°C the process were repeated for several time. The product was characterized by XRD and showing TiO2 layer of anatase structure. EDX analysis has shown that thin films have found of Ti and doped-metal. Their crystallized sizes were calculated by Scherrer formula shown that it obtained in various in range of 12-21 nm. According to transformation effectively of titania doped M in peat swam water shown that catalytic activity 34.4 – 53.7% for the irradiation during 24 hours. Keywords : titania, thin films, photocatalytic propertie

OPTIMALISASI TRANSPORT SELEKTIF ION Ni(II) TERHADAP Cd(II) DENGAN ZAT PEMBAWA OKSIN MELALUI TEKNIK MEMBRAN CAIR FASA RUAH SECARA SIMULTAN

  ABSTRACT The selective transport of Ni(II) to Cd(II) through simultaneously liquid membrane technique has been investigated. The cell membrane was made by mixturing Ni(II) and Cd(II) ions at concentration as 3.41x10-4 M and 1.78x10-4 M respectively as source phase, oxine in chloroform as membrane phase and Na2EDTA solution as receiving phase. Concentration of recidual Ni(II) and Cd(II) ions in source phase transported to receiving phase was measured by Atomic Absortion Spectrofotometry (AAS). The results showed the at optimum condition of Ni(II) and Cd(II) transport occurred at source phase of pH 7, oxine concentration 0.001 M in chloroform and 0.04 M Na2EDTA solution pH 7. In this condition, Ni(II) and Cd(II) transport selectivity was found 80.89%. From the experiment, it was found that the transport rate constant from source phase to membrane phase (k1) for Ni(II) (0.7544 per hour) smaller than Cd(II) (1.3800 per hour ), on the other hand the transport rate constant from membrane phase to receiving phase (k2) Ni(II) (2.7580 per hour) greater than Cd(II) (1.3790 per hour). The phase-to-phase transport of Ni(II) and Cd(II) was consecutive first order reaction.  Keywords : bulk liquid membrane, oxine, technique   

EFEK DOPANT TERHADAP STRUKTUR DAN KARAKTER DARI FOTOKATALIS POWDER TITANIA

 ABSTRACT The structure and characterization of the titania (M-TiO2) can be modified by metal doped and calcinations temperatures variation by sol-gel method. Characterization of gel and M-TiO2 powder realized by FT-IR, TGA, XRD, Photo Optic and SEM. Titania has two crystal structures such as anatase and rutile. Anatase structures shown higher photocatalytic properties than rutile. The crystal structure was characterized to JCPS reference no. 21-1272, 2Ө : 25.3° identically as anatase structure and 2Ө : 27.3° as rutile. Structure modification is depend on calcinations temperature change. At 400°C the anatase structure was formed. The anatase intensity was increased at 500°C and at 600°C anatase transportation to rutile was found and anatase mixture was obtained. Several types of dopant can inhibit anatase to rutil transformation process at temperature ≥ 600°C. Park et al.,[1] reported that calcinations temperature and valence ion dopant influence the crystal size. Based on Scherrer’s equation the crystal size can be calculated by using the XRD  data. The crystal size of maximum intensity which was identified as anatase structure at 500°C as following Fe-TiO2 10.6 nm, MoTiO2 16.8 nm.  M-TiO2 character through inhibition of E. Coli bacteria growth was great infulenced by particle size and dopant ion type. This character shown by MIC value (Minimal Inhibition Concentration)) of each Fe, Mo-TiO2 between 0.35 – 0.45%. Keywords : crystal structure, characterization, titania, sol-ge

Sintesis Nanomaterial Mangan Oksida Dengan Metode Bebas Pelarut

Manganese dioxide (MnO2) known as manganese oxide which has a variety polimorfi crystal structure, such as β-, α-, δ- and γ- MnO2. Each of manganese oxide material comprises a tunnel structure. With the structure of the tunnel which is owned by manganese oxide material is widely used as selective catalysts, ion exchange, and the exchange of molecules. Manganese oxide is synthesized using free methods solvent. Synthesis process is performed with a temperature variation of 90, 120, and 150 °C. The results was characterized by XRD and SEM. XRD diffraction patterns produced showed that the manganese oxide that is formed is a β-MnO2 (pyrolusite) with an optimum temperature of 120 °C. The resulting material also has a range of nanoparticles that reach 14:08 nm crystal size. Mangan shaped morphology produced oxide can degrade dye rhodamine B.DOI: http://dx.doi.org/10.15408/jkv.v0i0.3147

EKSTRAK METANOL DARI DAUN MAHKOTA DEWA (Phaleria macrocarpa) SEBAGAI INHIBITOR KOROSI BAJA DALAM ASAM KLORIDA

Vol 7 No 2ABSTRACTExtract of Phaleria macrocarpa leaves have been studied as corrosion inhibitor for mild steel ofhydrochloric acid solution 2.0 N. The efficiency of inhibition was evaluated by gasometric methodand electrochemical analysis. The temperature and concentration effects on the inhibitorsperformance were also investigated. The result obtained showed that the extract is one of promisingcandidate as an inhibitors for the corrotions of mild steel in HCl media, inhibition efficiencyincrease as the extract concentration is evaluated. The activation energy (Ea) increase with theaddition of the extract. Where inhibition of extract on the steel surface obey modified Langmuirisotherm equation. Potentiodynamic polarization curve indicated the Phaleria macrocarpa leavesextract play role as the anodic type inhibitor.Keywords : Corrosion inhibition, mild steel, Phaleria macrocarpa, hydrochloric acid

Penentuan Kondisi Optimasi Transpor Ion Cu (Ii) Melalui Teknik Membran Cair Fasa Ruah Secara Simultan Dengan Oksin Sebagai Pembawa

 ABSTRACT Determination of optimum condition and kinetic analysis Cu (II) iontransport by simultaneous bulk liquid membrane has been studied. Optimum condition for resource phase with Cu (II) ion concentration as 3,147 x 10-4 M obtained at pH 3 receiving phase with H2SO4 concentration 0,15 M and transport time as long as 3 hours through chloroform membrane using oxine 17,5 x 10-4 M as carrier. Transportation rate of Cu (II) ion decided by comparasion changer-over rest concentration in resource phase Rs and transpoted to receiving phase Rp and then monitored by Atomic Adsorbtion Spectrophotometre (AAS). Kinetic of transport Cu (II) ion process by simultaneous bulk liquid membrane technique fulfil irreversible consecutive first order reaction with transport Cu (II) ion gave (k1) value as 0,0442 minute-1 and ( k1 ) 0,0372 minute-1 . Simultaneous bulk liquid membrane method can be the alternative method in the determination of optimum condition and kinetic analysis of metal ions transport. Key words: Cu (II) ion, kinetic, optimum, transport, liquid membrane, simultaneous