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Heterogeneous Fenton Degradation of Batik Wastewater using Natural Pyrite Irawaty, Wenny; Yuliana, Maria; Wijaya, Christian J.; Retnoningtyas, Ery S.; Lourentius, Suratno; Puspitasari, Nathania; Hamidah, Umi
Reaktor Volume 23 No.3 December 2023
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.23.3.101-107

Heterogeneous Fenton processes with solid natural pyrite catalyst have gained attention for wastewater treatment. The improvement of degradation efficiency of natural pyrite is specific and therefore, it is still a challenging issue. This study was aimed to investigate the performance of Indonesian natural pyrite, without any purification, to treat the real wastewater obtained from batik home industry. To address this issue, several experiment variables such as pre-reaction between pyrite and hydrogen peroxide, hydrogen peroxide concentration, and pH were investigated. COD removal has been found to increase in a slightly acid condition (4.5 to 5.65) and inhibited at pHs of 8 and above (10). The results showed the presence of hydrogen peroxide was indeed greatly influence the wastewater degradation and the solution pH did not significantly change the wastewater degradation in the range of 3 and less than 8. Moreover, the pre-reaction period was found as the important part to initiate the degradation process. The optimum degradation efficiency was obtained by providing the pre-reaction time of 20 min with the addition of 326 mmol/L of H2O2 in the system and the mixture was reacted for 30 min at room temperature and real wastewater pH. Based on results observed in this study, it can be concluded that the batik wastewater can be degraded by natural pyrite up to 84% under reaction conditions studied. This finding offers great opportunity to further investigate and develop the heterogeneous Fenton process for real applications in industry.

Optimum and Green Fabrication of MIL-100(Fe) for Crystal Violet Dye Removal from Aqueous Solution Wijaya, Christian Julius; Soetaredjo, Felycia Edi; Yuliana, Maria; Santoso, Shella Permatasari; Hartono, Sandy Budi; Irawaty, Wenny; Lie, Jenni; Putro, Jindrayani Nyoo; Gunarto, Chintya; Puspitasari, Nathania; Ismadji, Suryadi; Gunawan, Setiyo
Indonesian Journal of Chemistry Vol 24, No 5 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.93323

MIL-100(Fe) was prepared and subsequently used to remove crystal violet dye from aqueous solutions simulating dye-containing wastewater in the environment. In the future, it is aimed that MIL-100(Fe) can be used in managing dye-containing wastewater in the environment and reducing the negative impacts it can cause. Here, MIL-100(Fe) fabrication needs to be optimized to obtain optimum process conditions, which are environmentally friendly and can produce MIL-100(Fe) with the best characteristics. This study focused on optimizing the fabrication of MIL-100(Fe), which is a type of MOF with good chemical stability, thermal stability, and flexible structure. In this study, the room-temperature fabrication of MIL-100(Fe) was established using a ligand-to-metal molar ratio of 0.95 and an acetic acid concentration of 5.1 vol% for 6.2 h. The optimum MIL-100(Fe) was tested for crystal violet removal and provided an optimum removal capacity of 182.66 ± 3.81 mg/g. Statistical approaches are used to investigate the independent parameters and their interactions contributing to MIL-100(Fe) formation.

Potential Conversion of Coconut Husk-Waste to Magnetic Cellulose Designed for Synthetic Dye Removal Natajaya, Andrean; Ongkowijoyo, Felix Natanael; Yuliana, Maria; Santoso, Shella Permatasari; Hartono, Sandy Budi
Jurnal Teknologi Lingkungan Vol. 25 No. 2 (2024)
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jtl.2024.5779

Increasing concern about sustainability and environmental issues caused by the massive amount of solid biomass waste in Indonesia has driven efforts to develop new products for various endues applications in energy, environment, and health sectors. This study uses coconut husk as the cellulose source to fabricate magnetic cellulose (MC) via coprecipitation with iron chloride salts. Combining cellulose with magnetite nanoparticles aims to improve the removal rate of synthetic dye as the latter provides high catalytic activity in the Fenton degradation process to eliminate persistent pollutants. The paramagnetic characteristics that MC possesses also make them quickly recovered after use. The adsorption capacity is found at 252.2 mg/g (pH 7, temperature of 30°C, the dye initial concentration of 100 ppm, and the precursor mass ratio of 1:4.8:25) for Rhodamine-B. The dye mineralization in this condition also reaches 50%, indicating that this adsorbent can be used as an efficient material to adsorb and degrade dye from an aqueous solution. This magnetic adsorbent will be of immense potential application for removing organic contaminants, particularly synthetic dyes, due to its good performance, simple separation, and ability to perform both adsorption and degradation processes simultaneously.

Kemampuan Serbuk Daun Nangka (Artocarpus heterophyllus Lamk) Dalam Menekan Serangan Nematoda Puru Akar (Meloidogyne Spp.) Pada Tanaman Seledri Yuliana, Maria; Marsuni, Yusriadi; Fitriyanti, Dewi
JURNAL PROTEKSI TANAMAN TROPIKA Vol 8 No 3 (2025): Oktober 2025
Publisher : www.ulm.ac.id

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jptt.v8i3.3516

Celery (Apium graveolens L.) is a leafy vegetable that plays a very important role and has significant export value. In terms of popularity and economic value, celery ranks second after lettuce among spice plants. In South Kalimantan, celery is widely cultivated, but there are serious obstacles faced by farmers, namely the attack of root knot nematodes (Melodogyne spp.) whose population is quite high. Celery plants infected with Meloidogyne spp. usually shows symptoms such as chlorosis on the leaves, stunted growth, wilted leaves, and a small number of roots. In severe conditions, the plant may die. Therefore, the search for environmentally friendly alternatives for pest control is very important. The aim of this research is to reduce dependence on chemical pesticides which can damage agricultural ecosystems. One alternative that can be considered in controlling pests is the use of vegetable pesticides derived from jackfruit leaves (Artocarpus heterophyllus Lamk). This research aims to test the effectiveness of jackfruit leaf powder in dealing with attacks by root knot nematodes (Meloidogyne spp.) on celery plants which is the main focus of this research. This research was carried out by applying the Completely Randomized Design (CRD) method, which aims to obtain accurate and reliable data regarding the impact of the attack which involves one factor, namely treatment using 500 Meloidogyne spp eggs. as a control and four other treatments with jackfruit leaf powder: 500 Meloidogyne spp. + 25 grams of jackfruit leaf powder (P1), 500 Meloidogyne spp eggs. + 50 grams of jackfruit leaf powder (P2), 500 Meloidogyne spp eggs. + 75 grams of jackfruit leaf powder (P3), as well as 500 Meloidogyne spp eggs. + 100 grams of jackfruit leaf powder (P4). The results of the research showed that treatment with 100 grams of jackfruit leaf powder (P4) was able to reduce the severity of the disease and the average number of root knot nematode populations. The highest disease severity was recorded in control plants (K0), namely 38.80%, while the lowest percentage was found in the treatment (P4) which only reached 12.50%. The highest root knot nematode population was observed in treatment (P1) with 427.25 individuals, while the lowest population was recorded in treatment (P4) with 199,875 individuals.

Kemampuan Serbuk Daun Nangka (Artocarpus heterophyllus Lamk) Dalam Menekan Serangan Nematoda Puru Akar (Meloidogyne Spp.) Pada Tanaman Seledri Yuliana, Maria; Marsuni, Yusriadi; Fitriyanti, Dewi
JURNAL PROTEKSI TANAMAN TROPIKA Vol. 8 No. 3 (2025): Oktober 2025
Publisher : www.ulm.ac.id

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jptt.v8i3.3516

Celery (Apium graveolens L.) is a leafy vegetable that plays a very important role and has significant export value. In terms of popularity and economic value, celery ranks second after lettuce among spice plants. In South Kalimantan, celery is widely cultivated, but there are serious obstacles faced by farmers, namely the attack of root knot nematodes (Melodogyne spp.) whose population is quite high. Celery plants infected with Meloidogyne spp. usually shows symptoms such as chlorosis on the leaves, stunted growth, wilted leaves, and a small number of roots. In severe conditions, the plant may die. Therefore, the search for environmentally friendly alternatives for pest control is very important. The aim of this research is to reduce dependence on chemical pesticides which can damage agricultural ecosystems. One alternative that can be considered in controlling pests is the use of vegetable pesticides derived from jackfruit leaves (Artocarpus heterophyllus Lamk). This research aims to test the effectiveness of jackfruit leaf powder in dealing with attacks by root knot nematodes (Meloidogyne spp.) on celery plants which is the main focus of this research. This research was carried out by applying the Completely Randomized Design (CRD) method, which aims to obtain accurate and reliable data regarding the impact of the attack which involves one factor, namely treatment using 500 Meloidogyne spp eggs. as a control and four other treatments with jackfruit leaf powder: 500 Meloidogyne spp. + 25 grams of jackfruit leaf powder (P1), 500 Meloidogyne spp eggs. + 50 grams of jackfruit leaf powder (P2), 500 Meloidogyne spp eggs. + 75 grams of jackfruit leaf powder (P3), as well as 500 Meloidogyne spp eggs. + 100 grams of jackfruit leaf powder (P4). The results of the research showed that treatment with 100 grams of jackfruit leaf powder (P4) was able to reduce the severity of the disease and the average number of root knot nematode populations. The highest disease severity was recorded in control plants (K0), namely 38.80%, while the lowest percentage was found in the treatment (P4) which only reached 12.50%. The highest root knot nematode population was observed in treatment (P1) with 427.25 individuals, while the lowest population was recorded in treatment (P4) with 199,875 individuals.

A Review of the Development and Role of Heterogeneous Catalysts for Biodiesel Production Yuliana, Maria; Ismadji, Suryadi; Wijaya, Christian Julius; Soetaredjo, Felycia Edi; Gunarto, Chintya; Santoso, Shella Permatasari; Putro, Jindrayani Nyoo; Anggorowati, Adriana Anteng; Lourentius, Suratno
Widya Teknik Vol. 23 No. 1 (2024): May
Publisher : Fakultas Teknik, Universitas Katolik Widya Mandala Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33508/wt.v23i1.5453

Indonesian regulations regarding the implementation of B30 encourage a significant increase in biodiesel demand. Moreover, this implementation will continue to be increased to B35 in 2025 and is projected to reach B100 in 2045. This high demand for biodiesel needs to be supported by the development of adequate biodiesel production technology where the catalyst is one aspect that plays an important role in biodiesel production. The use of catalysts aims to accelerate biodiesel production so that high biodiesel yields and good quality are achieved. In biodiesel production, the choice of catalyst greatly influences the operating conditions, the products produced, the subsequent purification process, and the environmental impacts. Moreover, the changing trend in biodiesel raw materials from food to non-food ingredients requires the development of catalysts that are more suitable for the raw materials used in biodiesel production. The specific characteristics of each catalyst play an important role in the transesterification reaction to produce biodiesel where this needs to be supported and adapted to optimum operating conditions, especially in terms of alcohol-to-oil molar ratio, catalyst amount, temperature, pressure, and reaction time. This review provides a comprehensive overview of the various heterogeneous catalysts used to assist the transesterification reactions in biodiesel production.

A Review of Biofuels and Their Positive Impacts on Health and the Environment Yuliana, Maria; Ismadji, Suryadi; Wijaya, Christian Julius; Soetaredjo, Felycia Edi; Lie, Jenni; Hartono, Sandy Budi; Irawaty, Wenny; Puspitasari, Nathania; Lourentius, Suratno
Widya Teknik Vol. 23 No. 1 (2024): May
Publisher : Fakultas Teknik, Universitas Katolik Widya Mandala Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33508/wt.v23i1.5454

Indonesia's high population and rapid economic growth are driving a major transformation in the transportation sector, which is in line with the high increase in fuel demand. The need for biofuel as a substitute for conventional fuel is increasingly being prioritized by considering sustainable development goals (SGDs). Biofuel has safer health and environmental impacts than conventional fuel but still has fuel performance that meets fuel standards and engine performance. Biofuels can be derived from a variety of more sustainable and abundant raw materials, such as biomass and vegetable oils. In this review biodiesel, hydrogenated vegetable oil (HVO), and direct vegetable oil (SVO) are discussed in depth regarding the transformation of their production processes and their impacts on health and the environment. Biodiesel is one of the most widely developed and implemented compared to HVO and SVO to encourage the use of renewable energy in various aspects of people's lives in Indonesia. These three biofuels have different fuel characteristics and performance but can continue to be developed in the future to increase the implementation of renewable energy more massively.

Teknologi Tepat Guna Mesin Pencuci Porang untuk Meningkatkan Produktivitas Petani Porang di Desa Morang, Kare, Madiun: Indonesia Irawaty, Wenny; Hadi; Wijaya, Christian Julius; Indrawati, Chatarina Dian; Anggorowati, Adriana Anteng; Soetaredjo, Felycia Edi; Santoso, Shella Permatasari; Ismadji, Suryadi; Yuliana, Maria; Ernest, Edward H; Wardhani, Rinda; Afendi, Yulius; Panjaitan, Imelda
Jurnal Abdimas Madani dan Lestari (JAMALI) Volume 06, Issue 01, Maret 2024
Publisher : UII

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jamali.vol6.iss1.art9

Recently, the productivity of porang tuber-based products has been growing well, especially after the Indonesian Government released a policy to prohibit the export of porang plants and their harvested products. One of the porang-based products is in the form of chips. Before processing, the porang tubers must be washed thoroughly to remove soil/dirt from the surface. The conventional washing process of each tuber can take up to 3-5 minutes. Therefore, the purpose of this activity is to design and manufacture porang washing equipment based on centrifuge washing model with rubber vibration. Four stages to carried out the program, i.e. designed and manufactured the washing machine, run the machine in laboratory, training activities to the porang farmers, and evaluation process. From the observation to porang farmers as our partner during the activity, it can be seen that the partners can operate the washing machine well. The results show that the washing process of porang tuber using this technology can save the washing time up to 90% compared to the conventional washing. The surface cleanliness of porang tubers resulted from the developed washing machine is the same as the conventional one. The noise level of the machine has met the requirement of Indonesian Government. It is clear that the usage of the machine can increase the production capacity of products-based porang tuber. In addition, the use of this technology may promote a more comfortable and healthy work environment due to ergonomic reason, however, based on RULA analysis, the machine is still need to be improved in the future. Overall, the partners were satisfied with this activity and expected to have further programs in the future.

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