Penentuan Kadar Logam Tembaga pada Perairan dan Sedimen di Limbah Pertambangan Tradisional Desa Perabu Kabupaten Lombok Tengah

. Prabu’s people in central Lombok regency make traditional mining for their livelihood. Coppers are one of the wastes from traditional mining, which is dumped into rivers can pollute the waters used by humans a source of clean water. Heavy metals in biota consumed by humans and transmit various diseases, This research to determination copper compound in waters and sediments. The are two puposes of this reseach: (1) to determine coppers in waters and sediments, and (2) to determine copper compound. There are three steps of this reseach: (1) conducting sampling, (2) pretreatment of sediment samples, (3) determining heavy metal levels with the fraction 1 stepwise extraction method (ELFE), and (4) analyzing copper compound . The result showed that copper compound increasing in locations B and C, contain 0.065 mg / L and 0.051 mg / L in water and contain 89 mg/kg, 85 mg/kg in sediment

Adsorption of Copper Ions by Microwave Treated Bentonite

Changes of bentonite surface structure under the influence of direct microwave irradiation during adsorpion of Cu2+ from concentrated solutions were investigated by X-ray and EDS analysis. The microwave treated bentonite (MTB) has been proved to have enhanced adsorption capacity for copper due to improved pore structure and some peculiarities of adsorption mechanism. The non-linear fitting of experimental data to the theoretical isotherms have demonstrated that the adsorption on natural bentonite fitted the Toth model, whilst microwave-treated bentonite fitted the Langmur-Freundlich model. The isotherm modeling allowed predicting the maximal adsorption capacities 44.8 mg/g. XRD and SEM analysis of MTB sample after adsorption indicated formation of microcrystals of individual copper compound. The adsorption on MTB sample takes place not only in pores or in monomolecular layer on the bentonite surface, but the prevalent mechanism is surface-induced co-precipitation of copper as microcrystals of individual copper compound.

PENGGUNAAN PENGGUNAAN KUPRISULFAT PADA PENCAPAN RINTANG METODA KHELASI LOGAM (METAL CHELATION) PADA KAIN POLIESTER DENGAN ZAT WARNA DISPERSI

Abstrak – Pencapan rintang metode khelasi logam (metal chelation) pada kain poliester menggunakan zat warna dispersi jenis antrakinon sebagai warna dasarnya, karena zat warna tersebut tidak tahan terhadap logam-logam transisi contohnya logam tembaga yang diperoleh dari senyawa kuprisulfat. Untuk warna motifnya digunakan zat warna dispersi jenis azo karena zat warna azo tahan terhadap logam-logam transisi. Senyawa kuprisulfat berfungsi menghalangi terfiksasinya zat warna pada serat yang ditambahkan pada pasta warna motifnya, sehingga perlu dilakukan optimasi pemakaiannya dengan variasi konsentrasi dan waktu fiksasi pengukusan, pada proses pencapan rintang metode khelasi logam (metal chelation) kemudian dilakukan pengujian terhadap derajat putih kain, beda warna, dan sifat fisik kain poliester. Keadaan terbaik dicapai pada konsentrasi kuprisulfat 35 g/kg pasta dan waktu fiksasi 180 derajar Celcius 6 menit dengan nilai derajat putih kain Delta K/S 0,0092, nilai beda warna Delta E= 1,09, kekuatan tarik kain dengan nilai 22,80 kg kearah lusi 19,50 kg kearah pakan, tahan luntur warna terhadap pencucian dan gosokan dengan nilai 4- 5. Abstract – Resist printing the metal chelation method on a polyester fabric uses an antrakinon dispersion dyes as its base color, because the dye is not resistant to transition metals, for example copper metal obtained from copper compound. Azo dispersion dyes are used for motif color because they are resistant to transition metals. Kuprisulfate compound functions to prevent the fixation of dyes in the fiber added to the color paste of the motif, so it is necessary to optimize its use with variations in concentration and time of streaming fixation in the metal chelation method, then testing the degree of white fabric, different colors, fabric tensile strength and color fastness to washing and rubbing. Optimum conditions were achieved at a concentration of kuprisulfate 35 g/kg paste and a fixation time of 180 Degrees Celcius for 6 minutes with a white degree of fabric Delta K/S 0.0092, color difference value Delta E= 1.09, fabric tensile strength with a value of 22.80 kg towards the warp 19.50 kg towards the feed, fastness to washing and rubbing with a value of 4- 5.

Investigation into the synthesis conditions of CuMoO4 by an in situ method and its photocatalytic properties under visible light irradiation

A kind of molybdenum and copper compound, CuMoO4, was prepared by a hydrothermal method.

Heterobimetallic complexes from 0D clusters to 3D networks based on various polycyanometallates and [Cu(dmpn)2]2+ (dmpn = 2,2-dimethyl-1,3-diaminopropane): synthesis, crystal structures and magnetic properties

Six new cyanide-bridged complexes (0–3D) have been assembled by employing one copper compound and six cyano precursors. Investigation of the magnetic properties revealed the ferro- or antiferromagnetic coupling between FeIII/CrI ion and CuII ion.