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Green synthesis of magnetically separable and reusable Fe_(3)O_(4)/Cdots nanocomposites photocatalyst utilizing Moringa oleifera extract and watermelon peel for rapid dye degradation

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Carbon Resources Conversion 2023年第4期6卷 274-286页

作者： Emi Kurnia Sari rivaldo marsel tumbelaka Harlina Ardiyanti Nurul Imani Istiqomah Chotimah Edi Suharyadi Department of Physics Universitas Gadjah MadaYogyakartaIndonesia Department of Physics Institut Teknologi SumateraLampungIndonesia

This study focused on green-synthesized magnetite/carbon dots nanocomposites(GS-Fe_(3)O_(4)/Cdots)utilizing Moringa oleifera leaf extract and watermelon peel waste for rapid degradation of methylene blue(MB)***-precipitation and hydrothermal method were used to synthesize GS-Fe_(3)O_(4) and Cdots,*** addition,the sonication method was used to link Cdots on Fe_(3)O_(4) surface.X-ray diffraction spectrum of GS-Fe_(3)O_(4)/Cdots inform the cubic inverse spinel and has crystallite size in the range of 10.1-7.2 *** crystallite size also decreased with the increase of Cdots *** transmission electron microscope showed the most uniform size of nanocomposites at around 13.4 *** functional group of Fe-O was detected on the nanocomposites,proof that Fe_(3)O_(4) still exists after *** presence of C=C,C-O,and C-O-C also indicates the existence of Cdots on the surface of Fe_(3)O_(4).The addition of Cdots affected the saturation magnetization and coercivity value in the range of 29.2-38.3 emu/g and 59-65 Oe,respectively,which showed a good magnetic *** an organic dye,MB was used for a photocatalytic process under UV *** degradation efficiency was raised to 98% for 30 min photocatalytic *** magnetically separable capability makes nanocomposites could be recycled and reused three times with high ***,GS-Fe_(3)O_(4)/Cdots potential as a low-cost and environmentally friendly reusable photocatalyst for rapid wastewater degradation.

关键词： Green synthesis Fe_(3)O_(4)nanoparticles Cdots Nanocomposite MB degradation

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An Integrated System for Active Filter and Photovoltaic Energy Conversion

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Journal of Energy and Power Engineering 2010年第6期4卷 39-44页

作者： H.H. tumbelaka M. Miyatake Department of Electrical Engineering Petra Christian University Surabaya 60236 Indonesia Department of Engineering and Applied Sciences Sophia University Tokyo 102-8554 Japan

This paper focuses on the implementation of a three-phase four-wire current-controlled Voltage Source Inverter （CC-VSI） as both power quality improvement and Photovoltaic （PV） energy extraction. For power quality improvement, the CC-VSI works as a grid current-controller shunt active power filter. Then, the PV array supported by the Hill- Climbing maximum power point tracking （MPPT） controller is coupled to the DC bus of the CC-VSI. The output of the MPPT controller is a DC voltage that determines the DC-bus voltage according to the PV maximum power. From computer simulation results, the CC-VSI is able to compensate for the harmonic and reactive power as well as to extract the PV maximum power.

关键词： Active power filter MPPT PV energy conversion.

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