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Pujiastuti, Hendrini
Universitas Sultan Ageng Tirtayasa
Chemical Engineering, Chemistry & Bioengineering

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Engineering and Fabrication of TiO2 Photocatalyst: review Pujiastuti, Hendrini; Kustiningsih, Indar
World Chemical Engineering Journal VOLUME 8 NO.1 JUNE 2024
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/wcej.v8i1.25787

Abstract

The photocatalytic reactions occurring on the surface of TiO2 photocatalysts are crucial factors determining the kinetics and mechanisms of photocatalytic reactions. Photocatalyst engineering, especially of TiO2, is important due to various applications in photocatalytic processes. This review paper presents the engineering of materials and fabrication processes for TiO2 photocatalysts. Material catalyst engineering includes the development of TiO2 composites with magnetic materials, other additives, and doping. With the development of the chitosan-TiO2 coating to create the nanocomposite film, red grapes could be effectively protected against microbial infection and have their shelf life increased. F-doping on TiO₂ can increase the amount of photocatalytic oxidative species, encourage electron separation, and improve visible light absorption. To improve the effectiveness of removing the photocatalyst from the treated liquid waste once the procedure is finished, magnetic particles are added to photocatalysts. Fabrication methods for TiO2 modification to obtain specific crystal structures, including hydrothermal methods, anodization, and template-assisted techniques, will also be discussed. Another important factor is the duration of the hydrothermal treatment; nanotubes are generated after more than 12 hours. In contrast to diluted solutions, longer nanotubes will be produced during the Ti anodization process when concentrated electrolyte solutions, such as ethylene glycol and glycerol, are used.
The Influence of Natural Bayah Zeolite on the Pyrolysis Process of Liquid Fuel Based on HDPE and PP Plastic Waste Heriyanto, Heri; Suhendi, Endang; Nasheh, Muhammad Yusril; Rizqillah, Muhammad Fathi; Wardalia, Wardalia; Pujiastuti, Hendrini
World Chemical Engineering Journal VOLUME 8 NO.1 JUNE 2024
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/wcej.v8i1.26617

Abstract

Pyrolysis is a decomposition reaction method involving the heating of a material with little or no oxygen. The objectives of this research are to utilize plastic waste for the production of liquid fuel and determine the optimal conditions for maximizing liquid fuel yield. The pyrolysis method was used at a temperature of 350°C for 300 minutes with High-Density Polyethylene (HDPE) and Polypropylene (PP) plastic as raw materials in composition variations of 7:3, 5:5, and 3:7, and the Bayah natural zeolite catalyst was activated and varied in amounts of 0%, 3%, and 5%. The analysis included yield tests, density tests, viscosity tests, calorific value tests, and the composition analysis of the liquid product yield.The results of this research indicated that the highest liquid product yield was obtained with a composition of 30% HDPE, 70% PP, and 0% catalyst, achieving a yield of 66.4%. It was concluded that the activated Bayah natural zeolite catalyst was not sufficiently effective in the pyrolysis process at a temperature of 300°C. The highest density and viscosity values were obtained with a composition of 70% HDPE, 30% PP, and 0% catalyst, which were 0.764 g/cm³ and 0.789 cP, respectively. The highest calorific value was obtained with a 50% HDPE and 50% PP composition, reaching 10,978.8 Cal/g. The composition analysis of the liquid product yield for a 70% HDPE and 30% PP composition resulted in 42% gasoline and 58% kerosene. For a 30% HDPE and 70% PP composition, the yield was 30% gasoline, 62% kerosene, and 8% diesel.
Eco-Friendly Transformation and Energy Efficiency in Methanol-to-Olefins (MTO) Processes: Innovations Toward Sustainable Olefin Production Heriyanto, Heri; Rochmat, Agus; Suhendi, Endang; Pujiastuti, Hendrini; Wardalia, Wardalia; Kanani, Nufus
World Chemical Engineering Journal VOLUME 8 NO. 2 DECEMBER 2024
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v8i2.30231

Abstract

Uncertainty regarding global crude oil prices has raised concerns for industry players, including the intermediate chemical industry such as olefins. The possibility of oil prices rising unpredictably makes the production of olefins from naphtha less attractive. On the other hand, abundant reserves of coal and natural gas are being considered as the foundation for developing the olefin industry based on gasification processes. The process routes include the formation of synthetic gas (SynGas) consisting of Hydrogen and Carbon Monoxide (H2 and CO), Methanol production from SynGas, and Olefin production from Methanol (MTO). This review aims to provide an overview of MTO and future developments related to the diversification of processes and technologies for the commercial production of olefins. Current research development on the Methanol-to-Olefins (MTO) process has narrowed down to three main areas, including: (1) Catalyst modification to increase reaction yield (particularly C2 and C3 products), (2) Determination of detailed reaction mechanisms in olefin formation, and (3) Catalyst deactivation processes in MTO.
Advances in Photocatalytic Nanocomposite Technology: Synthesis and Applications Pujiastuti, Hendrini
World Chemical Engineering Journal VOLUME 8 NO. 2 DECEMBER 2024
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v8i2.30235

Abstract

In wastewater treatment in particular, photocatalytic nanocomposites have shown great promise as a remedy for environmental contamination. Through the improvement of charge separation and the expansion of the spectral sensitivity to visible light, the synthesis of nanocomposites—which usually combine metal oxides like ZnO or TiO₂ with materials like carbon nanostructures or noble metals—improves photocatalytic performance. Sol-gel, hydrothermal, ion-exchange, and intercalation are some of the synthesis techniques that have been used to create these nanocomposites; each has its own advantages in terms of structural control and photocatalytic activity. Organic contaminants, including colors and medicinal chemicals, can be effectively degraded by photocatalytic nanocomposites. This overview covers the basic ideas of photocatalysis, how to create nanocomposite materials, and the latest developments in using photocatalytic nanocomposites for environmental cleanup. Making use of these resources provides a green, efficient, and sustainable approach to water purification, with future research focusing on improving their stability and scalability for industrial applications.
Utilization of Agricultural and Organic Waste as Eco-Friendly Biomass-based Adsorbents Pujiastuti, Hendrini; Aziz, Sarah Rafidah
World Chemical Engineering Journal VOLUME 9 NO. 1 JUNE 2025
Publisher : Chemical Engineering Department, Engineering Faculty, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/wcej.v9i1.33760

Abstract

The development of effective and sustainable remediation techniques is required due to the growing environmental contamination brought on by industrial activities, especially from heavy metals and organic pollutants. The purpose of this review is to evaluate critically the potential of biomass-based adsorbents made from organic and agricultural waste for use in environmental remediation, specifically in the treatment of soil and water. The study assesses the surface properties, functional groups, and adsorption mechanisms of several bio-adsorbents and groups them according to their sources, including activated carbon, agricultural residues, and biochar. The impact of chemical and physical changes on improving adsorption performance is also thoroughly examined. The results show that these environmentally friendly materials have notable adsorption capacities and provide a sustainable, scalable, and affordable substitute for traditional synthetic adsorbents. The study adds to the expanding corpus of research that supports the circular economy's waste valuation principles and emphasises the usefulness of green environmental management techniques.
Co-Authors Aziz, Sarah Rafidah Heriyanto, Heri Kanani, Nufus Kustiningsih, Indar Nasheh, Muhammad Yusril Rizqillah, Muhammad Fathi Rochmat, Agus Suhendi, Endang Wardalia, Wardalia