NITROGEN, WATER AND BENZENE ADSORPTION IN MESO POROUS CARBON (CMK-1) AND COMMERCIAL ACTIVATED CARBON (NORIT SX22)

ABSTRACT Adsorption at various interfaces has attracted the attention of many scientists. This article discusses gas-solid and vapour-solid adsorption in CMK-1 and Norit SX22 using nitrogen, water and benzene as adsorbates. For comparison, MCM-48 used as template in synthesizing CMK-1 was also utilized as adsorbent. Results showed that the shape of nitrogen isotherm for CMK-1 is categorized as Type IV shape, whereas activated carbon (Norit SX2) has Type I shape with a hysteresis loop at PlpD > 0.5, which is a H4 type of hysteresis. The shafJ.eof nitrogen isotherm for MCM-48 is categorized as Type IV shape with small hysteresis loop observed at PIFP above 0.45, indicating that the larger pores are filled at high PIFP,which is typical of an H3 hysteresis loop The amount of nitrogen adsorbed in activated carbon at the high relative pressure is considerably smaller than that in CMK-1. The hydrophobicity feature of CMK-1 is the same as activated carbon (Norit SX2), but slightly different to the template MCM-48. The affinity of CMK-1 to benzene is considerably higher than activated carbon, suggesting the promising future of CMK-1to be used as a selective adsorbent for the removal of organic compoundsfrom water environment. Keywords: Adsorption, water, benzene, CMK-1,activated carb

FTIR AND NMR STUDIES OF ADSORBED CETHYLTRIMETHYLAMMONIUMCHLORIDE IN MCM-41 MATERIALS

The high use of surface-active agents (surfactants) by industry and households today leads to environmental pollution, therefore treatments are required to remove such substances from the environment. One of the important and widely used methods for removal of substances from solution is adsorption. In this research, MCM-41 and its modified product of MCM41-TMCS were used to adsorb cationic surfactants, cethyltrimethylammonium chloride, CTAC. FTIR and NMR methods were used to study the interaction between the surfactants and the adsorbents. MCM-41 was synthesized hydrothermally at 100°C and its modification was conducted by silylation of MCM-41 with trimethylchloro silane (MCM41-TMCS). Both unmodified and, modified MCM-41 can adsorb the surfactant. The interaction of CTAG with MCM-41 was mostly the electrostatic interaction between the electropositive end of the surfactant and MCM-41, whereas in modified MCM-41 hydrophobic interactions become more dominant. These hydrophobic interactions appear however to involve the methyl groups on the head group of the surfactant interacting with the modified surface. Keywords: FTlR, NMR, adsorbed CTAC, MGM-41material

Mesoporous Silica MCM-48 as Chloramphenicol Adsorbent

This study is aimed to determine the potential use of MCM-48 to adsorb chloramphenicol pollution. Chloramphenicol adsorption was conducted at various times contact and concentration. Adsorption isotherm was studied by comparing Langmuir and Freundlich adsorption isotherm. The results showed that chloramphenicol adsorption was suited to Freundlich isotherm with an optimum contact time of 80 minutes&nbsp

Modifikasi Silika Mesopori MCM-48 dengan Gugus Tiol untuk Adsorpsi Ion Logam Ag(I)

A research of silica mesoporous MCM-48 modified by using 3-MPTMS has been conducted. MCM-48 and its modification (MCM-48-SH) can be used to overcome environmental contamination by heavy metals. Adsorption of Ag(I) ion by MCM-48 and MCM-48-SH was studied with variation of contact time, temperature, and concentration of Ag(I) ion. X-Ray Difraction (XRD) and Fourier Transform Infra Red (FTIR) were used to characterize MCM-48 and MCM-48-SH. Langmuir and Freundlich models were used to study the adsorption isotherm of Ag(I) by MCM-48 and MCM-48-SH. The result showed that adsorption of Ag(I) by MCM-48 is suitable with Langmuir and Freundlich models. The adsorption capacity of Ag(I) by MCM-48 according to Langmuir model is 45.66 mg/g and 9.3562 mg/g with Freundlich model. The adsorption capacity of Ag(I) by MCM-48-SH is 294.1176 mg/g for Langmuir model and 49.11 mg/g for Freundlich model

PEMANFAATAN Nannochloropsis salina SEBAGAI BIOSORBEN UNTUK MENGATASI PENCEMARAN Ni2+

Penelitian mengenai pemanfaatan Nannochloropsis salina sebagai biosorben untuk mengatasi pencemaran Ni2+ telah dilakukan. Penelitian ini bertujuan untuk menentukan pola pertumbuhan N. salina pada medium yang tercemar Ni2+, menentukan efisiensi penjerapan Ni2+ oleh N. salina, dan menentukan gugus fungsi yang terlibat dalam penjerapan Ni2+ oleh N. salina. Pada penelitian ini, pemaparan Ni2+ dilakukan di awal pertumbuhan N. salina. Pertumbuhan N. salina diamati setiap hari dengan cara menghitung jumlah populasi N. salina. Konsentrasi Ni2+ dalam filtrat ditentukan dengan menggunakan SSA. Gugus fungsi yang terlibat dalam penjerapan diidentifikasi dengan menggunakan FT-IR. Pola pertumbuhan N. salina pada medium yang tercemar Ni2+ berbeda dengan pola pertumbuhan N. salina pada medium tanpa dicemari Ni2+. Efisiensi penjerapan berbanding terbalik dengan konsentrasi logam yang dipaparkan pada medium pertumbuhan N. salina. Efisiensi penjerapan maksimum Ni2+ 5 ppm oleh N. salina sebesar 64,80 %, Ni2+ 10 ppm sebesar 46,80 %, dan Ni2+ 15 ppm sebesar 34,40 %. Gugus fungsi yang berperan dalam proses penjerapan Ni2+ oleh N. salina adalah gugus karboksil

BIOSORPSI Cd2+ OLEH Nannochloropsis salina DALAM MEDIUM CONWY

Penelitian tentang biosorpsi Cd2+ oleh Nannochloropsis salina dalam larutan Medium Conwy telah dilakukan. Penelitian ini dilakukan dengan tujuan memanfaatkan mikroalga N. salina sebagai biosorben untuk polutan Cd2+ di perairan. Pada penelitian ini pemaparan Cd2+ dengan variasi konsentrasi 5, 10, dan 15 ppm yang dilakukan di awal masa pertumbuhan N. salina dalam Medium Conwy pada salinitas 30 "???," aerasi dan pencahayaan kontinyu, serta suhu ruangan 20 oC. Metode analisis yang digunakan dalam penelitian ini adalah Spektrofotometer Serapan Atom (SSA) dan Forrier Transformation Infra Red (FT-IR). Waktu optimum pertumbuhan N. salina sebagai kontrol diperoleh pada hari ke-10, sementara pertumbuhan N. salina yang dipapar ion logam menunjukkan jumlah populasi N. salina berbanding terbalik dengan konsentrasi Cd2+ yang dipaparkan. Efesiensi penjerapan maksimum Cd2+ oleh N. salina terjadi pada kultur yang terpapar 10 ppm yaitu 59,70 %. Gugus fungsi yang terlibat dalam proses biosorpsi Cd2+ oleh N. salina adalah gugus O-H, C-N dan C-O

Peta Asam Lemak Berbagai Spesies Lamun (Seagrass) di Pantai Kabupaten Donggala

ABSTRAK Telah dilakukan identifikasi kuantitatif jenis-jenis asam lemak lamun dari spesies Thalassodendron ciliatum, Cymodocea rotundata, Cymodocea serrulata, Thalassia hemprichii, dan Enhalus acoroides. Analisis lemak contoh yang diambil di perairan kabupaten Donggala ini dilakukan dengan metode soxhlet dan analisis asam lemak menggunakan metode GC. Ternyata diperoleh variasi kandungan lemak antara 0,27 % - 1,01 %, sementara konsentrasi asam lemak jenuh yang ditemukan bervariasi antara 4,39 % - 8,03 %, asam lemak tak jenuh bervariasi antara 4,48 % - 18,39 %, dan omega 3 (EPA) bervariasi antara 0,27 % - 1,24 %. Hasil di atas, jika digabungkan bersama hasil analisis protein, fosfat, dan mineral dapat menjadi dasar untuk memperkirakan status kesuburan lamun. Kata kunci : Lamun, asam lemak, ABATRACT The quantitative analyses of fatty acids various was conducted from the seagrass Thalassodendron ciliatum, Cymodocea rotundata, Cymodocea serrulata, Thalassia hemprichii, and Enhalus acoroides speciess. The sampel takken from Donggala coast is analyses as the soxhlet method and the Gas Chromatography. The result obtained obstetrical variation of  fatty are vary among 0,27 - 1,01 %, for a while concentration of saturated fatty acids are vary among 4,39 - 8,03 %, unsaturated fatty acid are vary among 4,48 - 18,39 %, and omega 3 (EPA) are vary among 0,27 - 1,24 %. The result is it is joined with the protein, phosphate, and mineral analyses result can become basic for estimate the fertility status the sea grass. Keyword: Sea grass, fatty aci

Sintesis Selulosa Suksinat Melalui Reaksi Esterifikasi Asam Suksinat

Cellulose is a biopolymer that is widely applied in various fields. Modification of cellulose is needed to increase the added value of cellulose. One of these cellulose derivatives is cellulose succinate. This study aims to synthesize succinic cellulose using succinic acid. This research covers the synthesis of cellulose succinate via esterification reaction with a variation of succinic acid (1.6%; 2.4%; 3.2% and 4.0%), DS determination by titration method, and characterization with FTIR. Based on the synthesis results, the optimum DS was obtained at 2.4% succinic acid (SS3) concentration, namely 0.692. The results of the characterization with FTIR also showed the presence of a C=O absorption band indicating the presence of cellulose succinate monoester

17,18-dihydroxy Montecristin Compound from the Stem Bark of the Soursop (Annona muricata Linn.)

The development of natural ingredients use for conventional medicine is now in high requirement due to the traditional drugs are reasonably undemanding to be achieved. Annonaceae is one plant family which is usually utilized as medical plants in Indonesia and many other countries. One species of the family which is regularly used as customary medicine is A. muricata Linn which is well-known as soursop that comes from Caribbean, Central America, and South America. Along with the technological advancement, compounds and efficacy of soursop plant becomes popular. Annona muricata Linn. or soursop belongs to the Annonaceae family that is traditionally used to treat various diseases, such as cancer, diarrhea, convulsive, fungal and itching. The purpose of this study was to isolate and purify secondary metabolites of ethyl acetate fraction of the soursop stem bark. Research methods include extraction (maceration), fractionation and BLST test against Artemia salina. The structure of the 17.18-dihydroxy montecristin compound was determined by IR, 1H and 13C-NMR spectra HMBC and COSY. The compound had an activity to the tumor cell of murine leukemia cells P-388 with the IC50 value of 34.05 mg/mL respectively. This study found that the compound of 17.18-dihydroxy montecristin have been isolated from the stem bark of A. Muricata L. which has potential as an anticancer with the IC50 of 34.05 µg/mL