Judul: Adsorption of Cu(II) using synthetic Zeolite from coal fly ash
Abstrak: Fly ash and synthetic zeolite synthesized from coal fly ash had been used to investigate the adsorption of Cu2+ synthetic solution. Optimation studies of adsorption process was performed batch system in central composite design with three parameters, pH, contact time, and concentration of adsorbent. The optimum condition for adsorption process for fly ash and synthetic zeolite were found at pH 5.5 and 4, contact time 83 and 58 minutes, and adsorbent concentration at 150 and 90 mg/50 mL solution respectively. The Langmuir and Freundlich isotherm models were applied. The Langmuir models fits best the equilibrium isotherm data. The optimum fly ash and zeolite synthetic adsorption capacities were 4,11 mg/g and 60,97 mg/g respectively. The kinetics data were tested using a pseudo first-order and a pseudo second-order Lagergren equation. Kinetics data correlated well with the pseudo second-order kinetics model. Thermodinamic study indicated that adsorption process was spontaneous and accompanied by an increase in entropy and decrease in Gibbs energy. The decreasing of adsorption capacity of Cu(II) by both fly ash and synthetics zeolite were influenced by the coexisting ions Pb(II) or Mn(II), although there were increasing of the total adsorption capacity.
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Judul: Adsorpsi Cu(II) menggunakan zeolit sintetis dari abu terbang batu bara
Abstrak: Fly ash and synthetic zeolite synthesized from coal fly ash had been used to investigate the adsorption of Cu2+ Key word : fly ash, synthetic zeolite, isothermal adsorption, kinetics model, Langmuir and Freundlich models, Gibbs energy, entropy synthetic solution. Optimation studies of adsorption process was performed batch system in central composite design with three parameters, pH, contact time, and concentration of adsorbent. The optimum condition for adsorption process for fly ash and synthetic zeolite were found at pH 5.5 and 4, contact time 83 and 58 minutes, and adsorbent concentration at 150 and 90 mg/50 mL solution respectively. The Langmuir and Freundlich isotherm models were applied. The Langmuir models fits best the equilibrium isotherm data. The optimum fly ash and zeolite synthetic adsorption capacities were 4,11 mg/g and 60,97 mg/g respectively. The kinetics data were tested using a pseudo first-order and a pseudo second-order Lagergren equation. Kinetics data correlated well with the pseudo second-order kinetics model. Thermodinamic study indicated that adsorption process was spontaneous and accompanied by an increase in entropy and decrease in Gibbs energy. The decreasing of adsorption capacity of Cu(II) by both fly ash and synthetics zeolite were influenced by the coexisting ions Pb(II) or Mn(II), although there were increasing of the total adsorption capacity
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Judul: Prolapsus vagina kronis, kausa dan teknik reposisinya
Abstrak: Prolapsus vagina kronis merupakan penyembulan bagian belakang hewan, khususnya lantai vagina melalui vulva, diikuti dengan perpindahan serviks dan uterus ke belakang. Pada sapi kejadian prolapsus vagina sering pada masa 2-3 bulan akhir kebuntingan, sedangkan pada domba dan hewan sejenisnya terjadi beberapa minggu sebelum melahirkan. Kasus prolapsus vagina kadang-kadang dapat terjadi setelah melahirkan, dan jarang terjadi tanpa ada hubungannya dengan kebuntingan atau kelahiran. Penyebab prolapsus vagina kronis belum dapat dipastikan, beberapa faktor umumnya ambil bagian. Faktor uta- ma adalah tingginya kadar hormon estrogen pada akhir kebuntingan. Faktor mekanis dengan meningkatnya tekanan intra abdominal dan gaya berat dari fetus dalam kandungan. Beberapa faktor predisposisi yang dapat menunjang terjadinya prolapsus vagina adalah: perlukaan saluran kelahiran, kelahiran yang rapat, makanan yang kurang baik, terbatasnya pergerakan, faktor lingkungan dan hereditas. Prolapsus vagina kronis umumnya hampir terjadi pada semua hewan piara, lebih sering pada sapi dan domba. Pada sapi sering terjadi pada sapi potong jenis Hereford ...
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