The preparation of titanium oxide-zeolite composite (TiO2-zeolite) has been done. Preparation was initiated by dispersing oligocation of titanium solution into suspension of natural zeolite. The suspension was stirred and then filtered to separate the solid phase from the filtrate. The solid phase was heated by microwave oven to convert the oligocations into its oxide forms and the resulting material (called as TiO2-zeolite) then was used to photodegrade the wastewater of PT.Jogjatex The TiO2-zeolite and unmodified zeolite were characterized using X-ray diffractometry, FT-IR spectro-photometry, X-ray fluorescence (XRF) and gas sorption analysis (GSA) methods to determine their physicochemical properties. Photocatalytic activity of TiO2-Zeolite was tested by exposing the suspension of TiO2-Zeolite/wastewater by the UV light of 366 nm at room temperature for 15 - 75 minutes. Characterization results exhibited that the formation of TiO2 on internal as well as external surfaces of Zeolite could not be detected  with X-ray diffractometry as well as  FT-IR spectrophotometry, however elemental analysis result with XRF indicated that titanium concentration in zeolite increased due to the inclusion, i.e from 0.26% (w/w) in zeolite to 2.80% (w/w) in TiO2-zeolite. Characterization result by GSA exhibited the increased of specific surface area from 19.57 m2/g in zeolite to 67.96 m2/g in TiO2-zeolite; total pore volume from 20.64 x 10-3 mL/g in zeolite to 49.561 x 10-3 mL/g in TiO2-Zeolite; pore radius average decreased from 21.10 Å in zeolite to 14.58 Å in TiO2-zeolite. Photocatalytic activity test of TiO2-zeolite on wastewater of PT. Jogjatex showed that UV radiation for 75 minutes on the mixture of TiO2-zeolite and wastewater resulted in the decreased of  COD number up to 57.85%. Meanwhile the sorption study showed that zeolite and TiO2-zeolite could decrease COD number of wastewater up to 43.95% and 57.85%, respectively.   Keywords: TiO2-zeolite, photocatalytic, wastewater

The aim of this study is to produce biodiesel from palm oil using heterogeneous catalyst i.e. KOH/ZrO 2 -Bentonite. The catalyst was prepared through KOH impregnation on ZrO 2 -Bentonite with a ratio between KOH:ZrO 2 -Bentonite was 20-30 wt%. Afterwards, it was followed by the heating process using microwave radiation 700 W for 10 minutes Based on the result of the characterization using XRD, Gas Sorption Analyzer, FTIR and SEM-EDX, the best performance for the ratio of KOH:ZrO 2 -Bentonite of the process was on 25 wt%. The catalytic activity test on palm oil transesterification resulted methyl ester as much as 81% on the reaction condition of 65 o C for three hours. In addition, the amount of catalyst-used was as much as 3% of the oil weight. The result of ASTM test showed that the methyl ester product from palm oil fulfills the National Test Standard for Diesel Oil referring to SNI 04-7182-2006.

The preparation and characterization of charcoal from sago pulp as an adsorbent in reducing content of COD and BOD of tofu factory waste has been carried out. Sago pulp has been turned into charcoal through carbonization at 400oC for 2 hours. The results of charcoal characterization using XRD show that the carbon produced from sago pulp carbonization has a low crystallinity which is indicated by a wide peak at around 2θ 23oC, which is the characteristic carbon peak. The results of characterization using Surface Area Analyzer show that the pores in the sago pulp charcoal are very few and irregular, and dominated by macropores. The results of the characterization using SEM showed that sago pulp charcoal had very few pores. The material is dominated by the residue from the results of non-porous carbonization. Performance as an adsorbent to reduce the content of COD and BOD in tofu mill wastewater by batch method shows the capacity and efficiency of adsorption on COD of 75.00 mg/g and 35.21%, respectively.  While capacity and efficiency of adsorption on COD of 7.00 mg / g and 3.57%, respectively

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Telah dilakukan preparasi dan karakterisasi lempung alam terpilar Al2O3 sebagai adsorben zat warna metil orange. Pilarisasi lempung dilakukan melalui interkalasi polikation Al pada lempung alam yang dilanjutkan dengan kalsinasi pada suhu 400 ºC selama 2 jam. Hasil sintesis dikarakterisasi dengan XRD untuk melihat basal spacing dan luas permukaan menggunakan metode adsorpsi gas nitrogen menggunakan Surface Area Analyzer, sedangkan analisis zat warna metil orange hasil adsorpsi dilakukan menggunakan spektrofotometer UV-VIS. Hasil penelitian menggunakan XRD diperoleh bahwa proses pilarisasi oksida logam aluminium (Al2O3) telah berhasil, dibuktikan dengan terjadinya pergeseran bidang d001 ke sudut yang lebih kecil diikuti dengan peningkatan basal spacing pada lempung terpilar Al2O3. Analisis luas permukaan, volum total pori, diameter pori rata - rata masing-masing sebesar, 57,743 m2/g, 1,76 cm3/g, 6,1015 Å. Adsorpsi dilakukan secara batch  dengan variasi waktu kontak 5, 10, 15, 20, 25 menit pada kecepatan 300 rpm serta variasi massa 0,1, 0,2 dan 0,3 g. Kapasitas dan efesiensi adsorpsi lempung terpilar Al2O3 pada adsorpsi zat warna metil orange yang paling tinggi pada waktu kontak 5 menit yakni 2,545 mg/g dan 84,008%.

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