Departemen Kimia, Universitas Gadjah Mada dengan bangga mempersembahkan konferensi internasional pada pertukaran ion 2018 (ICIE 2018), yang diadakan pada 10-13 September 2018, di Yogyakarta Indonesia.
Untuk informasi lebih lanjut, kunjungi website ICIE 2018.

Date: September 10^th – 13^rd, 2018

Host Venue: University Club, Universitas Gadjah Mada, Yogyakarta, Indonesia.

Topics and Scope

The conference has aims to stimulate and promote a mutual discussion and exchange the latest developments on the fundamental and applied studies of ion exchange and its related subjects. The general topics of the conference will be: read more

Publikasi terbaru dari staf Departemen Kimia FMIPA UGM :

Journal of Environmental Chemical Engineering
Volume 4, Issue 2, June 2016, Pages 1839–1849, ddoi:10.1016/j.jece.2016.03.016

Adsorption of mercury(II) on dithizone-immobilized natural zeolite
Link : Sciencedirect

Mudasir Mudasir, Karelius Karelius, Nurul Hidayat Aprilita, Endang Tri Wahyuni

Abstract

Adsorption of Hg(II) ions onto selective adsorbent of dithizone-immobilized natural zeolite (DIZ) from Wonosari, Yogyakarta, Indonesia has been investigated in batch mode. Some parameters influencing immobilization of dithizone and adsorption of Hg(II) were optimized including effect of temperature and reaction time on the effectiveness of dithizone immobilization as well as effect of pH, contact time and initial concentration of Hg(II) ion on the efficiency of the Hg(II) adsorption. Preliminary application of the adsorbent in the removal of Hg(II) ion in river water spiked with Hg(II) was also studied. The FT-IR and XRD analytical results show that the surface of natural zeolite can be modified by immobilization of selective organic ligand towards Hg(II) ions. The optimum conditions for the adsorption of Hg(II) is achieved at pH 5 and 90 min of contact time. Kinetics and adsorption isotherm studies suggest that the capacity, affinity and selectivity of the DIZ in adsorbing hazardous metal ions such as Hg(II) is significantly improved compared to those of non-immobilized activated natural zeolite (AZ). The Hg(II) adsorption capacity for AZ and DIZ at optimum condition is 8.0 and 13.1 µmol/g, respectively and the both adsorption follows first-order reaction. It has also been demonstrated that the DIZ adsorbent may be applied in the removal of Hg(II) ion in the river water spiked with Hg(II) ion up to 99.36% from the initial concentration of 8 mg L-1 in two serial batch adsorptions. read more

Publikasi terbaru dari staf Departemen Kimia FMIPA UGM :

International Journal of Biological Macromolecules
Volume 82, January 2016, Pages 48–53, doi:10.1016/j.ijbiomac.2015.10.021

In vitro hemocompatibility of PVA-alginate ester as a candidate for hemodialysis membrane

Choirul Amri, Mudasir Mudasir, Dwi Siswanta, Roto Roto

Abstract

Alginate based biopolymer with improved physical and chemical properties after esterification using polyvinyl alcohol (PVA) has been studied for possible application as a hemodialysis membrane. The alginic acid to vinyl alcohol molar ratio was predetermined at 0, 0.1, 0.5 and 1. Mechanical strength, hydrophilicity and Ca2+ adsorption of the membrane before and after modification were evaluated. The obtained PVA-alginate (PVA-Alg) ester membrane was also confirmed using FTIR and SEM. It shows that the PVA-Alg membrane tensile strength is higher than that of native alginate. The water contact angle of the membrane was found to be around 33–50°. The Ca2+ adsorption capacity tends to decrease with the increase in molar ratio. Furthermore, the modified PVA-Alg ester membrane achieves better protein adsorption and platelet adhesion than the unmodified one. It also exhibits a dialysis performance of 47.1–50.0% for clearance of urea and 42.2–44.6% for clearance of creatinine, respectively. It is expected that this PVA-Alg ester may challenge cellulose acetate for potential application as hemodialysis membranes. read more

Publikasi terbaru dari staf Departemen Kimia FMIPA UGM :

Chemical Physics Letters, April 2016, doi:10.1016/j.cplett.2016.04.010

Revisiting Structure And Dynamics of Ag+ in 18.6 % Aqueous Ammonia : An Ab Initio Quantum Mechanical Charge Field Simulation

Niko Prasetyo dan Ria Armunanto

Highlights
• Very first application of QMCF-MD to investigate Ag+ ion in aqueous ammonia.
• First solvation shell is labile compared to result from previous QM/MM-MD study.
• [Ag(NH3)2(H2O)3]+ dominate during simulation time. read more