Pollution is serious environmental problem. One of causes of pollution is the presence of heavy metals. Besides heavy metal, there are plastics that cause serious problem in environment because they are difficult to decompose. These two problems appear an idea about synthesizing activated carbon-magnetite (Fe3O4) composite based on polyethylene that can absorbs heavy metals. The method used literature review of relevant articles. This study examines the properties of magnetite both physical and chemical along with applications and benefits of magnetite in daily life. This study can become a new perspective effort to reduce heavy metals pollution using plastic waste as composite with Fe3O4

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Partial oxidation reaction of bio-methane as a source of methane using ZSM-5 heterogeneous catalyst modified with iron oxide has been carried out. In this study, the ZSM-5 catalyst was synthesized using the double template method using kaolin and natural zeolite as silicate and aluminate sources. The as-synthesized ZSM-5 nat and the Fe2O3/ZSM-5 nat catalysts were analyzed using XRD, XRF and BET. The characterization reveals that the synthesis of ZSM-5 was successful and the amount of iron(III) loaded was 2.98 %. The application test of Fe2O3/ZSM-5 nat as a catalyst was carried out in stainless steel batch reactor with a certain CH4:N2 feed ratio at 150 °C for 120 min. The reaction products were then analyzed with GC-FID to measure the % yield of methanol product. It is found that Fe2O3/ZSM-5 nat catalyst could give 54.93 % yield of methanol. Although the use of bio-methane as feed with lower CH4 : N2 ratio, this catalyst was also active and produced 12.26 % yield of methanol.

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