Synthesis of graphene nano sheets were carried out by using new route and ammonia as well as to produce gram scale graphene. Graphene nano sheets was characterized by using Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), and Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX). The results of XRD showed that the reemergence of diffraction lines C(002) at 2θ =26.5°, and the distance between the planes is 3.35 Å, which shows the typical structure of graphite and multiple layer of graphene. The results of SEM-EDX showed that the particle size and the graphene nano sheets has a smaller pore size and uniform and randomly arranged aggregates with a thin layer which is closely related to one another. Graphene nano sheets has small size or shape is small and thin also aggregate related with each other.

Size controlled Pt catalysts supported by graphene nanosheets (GNS) are successfully prepared by changing the loading of Pt at 10−70 wt % using an impregnation method. It is found that Pt sub-nanoclusters (0.8 nm) with an extremely large surface area (170 m 2 g −1 ) are formed on the GNS support in a 10 wt % Pt/GNS catalyst. An increase in loading of Pt leads to an increase in the particle sizes of Pt, which results in lower activities for electrooxidation of adsorbed CO. A core level shift of Pt 4f in XPS indicates that Pt is chemically interacted with graphene. The modification of catalytic properties and the electronic structure is ascribed to the interface interaction between Pt and graphene via π−d hybridization.

The formation mechanism of Pt subnano-clusters composed of 5–40 Pt atoms on graphene nanosheets (GNS) has been studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscope (TEM). The exchange of Cl– ion by OH– ion and the reduction of Pt4+ to Pt2+ are examined by XPS in the reduction of an H2PtCl6 catalyst precursor by ethanol at different pH. XPS and TEM results show that particles of Pt2+-containing compounds with the sizes of 2–7 nm are first formed on GNS by the reduction of H2PtCl6 with ethanol, which are then fully reduced to Pt subnano-clusters by H2 at 400 °C. The proposed mechanism for the Pt subnano-cluster formation includes two pivotal surface reactions: the reduction of Pt2+ particles into isolated Pt atoms by H2 on the GNS surface, followed by the formation of Pt subnano-clusters by collision of the Pt single atom migrating on GNS.

AbstrakPelabuhan Kalabahi-Alor di lahan milik PT (persero) pelabuhan Indonesia III Cabang Kupang, dengan luas daerah daratan pelabuhan 71.131 m2 dan lingkungan kerja perairan 1.880 Ha. Sedangkan luas lingkungan kepentingan adalah 1.813 Ha. Dengan ukuran 4 x 5 meter untuk dermaga I dan 115 x 10 meter untuk dermaga II. Wilayah monitoring termasuk dalam wilayah Kelurahan Teluk Mutiara, Kecamatan Teluk Mutiara,   Kabupaten Alor Provinsi NTT. Kegiatan ini dilakukan untuk analisis monitoring kualitas perairan laut di lingkunganpelabuhan umum Kalabahi-Alor.Kualitas air meliputi kualitas kimia-fisika perairan laut disekitar pelabuhan. Sampel air laut diambil dari 3 (tiga lokasi) yang berbeda. Hasil analisis dan pemantauan menunjukan bahwa kualitas air laut di kawasan pelabuhan merupakan dampak dari:kegiatan perkapalan (pengoperasian kapal dan kecelakaan kapal), limbah  yang berasal dari limbah kapal (bongkar-muat barang), aktivitas pelabuhan lainnya (seperti kegiatan kuliner),saluran drainase yang bermuara kelaut, bocoran dan tumpahan pembongkaran muatan yang bercampur minyak dan oli dari sisa ballast dan air sisa pencucian, serta limbah pemukiman yang masuk secara langsung di pinggiran pelabuhan.Data kualitas (sifat kimia-fisika) air laut wilayah perairan  pelabuhan Umum Kalabahi  yang dilaksanakan secara analisis insitu maupun laboratorium menunjukkan bahwa seluruh parameter yang diukur masih memenuhi baku mutu yang diizinkan oleh peraturan pemerintah.Kata Kunci: analisis, kualitas air laut, pelabuhan Waingapu AbstractKalabahi-Alor port on land owned by PT (Persero), the Indonesian port of Kupang Branch III, with an area of 71 131 m2 area of port land and waters 1,880 Ha working environment. While the broad sphere of interest is 1,813 Ha. With a size of 4 x 5 meters to the pier I and 115 x 10 meters to dock II. Monitoring region including the Gulf Pearl Village area, Teluk Mutiara, Alor Regency NTT Province. This activity is carried out for the analysis of sea water quality monitoring in the public ports Kalabahi-Alor. The quality of water include chemical-physical quality of the marine waters around the port. Sea water samples taken from 3 (three locations) are different. The results of analysis and monitoring showed that the seawater quality in the port area is the impact of: the activities of shipping (operation of ships and shipwrecks), waste from waste ship (loading and unloading), the activity of other ports (such as culinary activities), drainage channels which empties into the sea, leaks and spills that mixes the unloading of oil and oil from the remaining residual ballast water and washing, as well as residential waste that goes directly on the outskirts of the port. Data quality (chemical-physical) sea water port water area Kalabahi General conducted an in situ and laboratory analysis showed that all the measured parameters still meet quality standards permitted by government regulations.Keyword : analysiss, sea water quality, Waingapu port