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Layered Clay-Alginate Composites for the Adsorption of Anionic Dyes: A Biocompatible Solution for Water/Wastewater Treatment

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Journal of Water Resource and Protection 2014年第3期6卷 177-184页

作者： Sanil Sebastian S. Mayadevi B. Sajeena Beevi Sujata Mandal 1Chemical Engineering and Process Development Division CSIR-National Chemical Laboratory Pune India 2Chemical Engineering Department Government Engineering College Trissur India Chemical Engineering and Process Development Division CSIR-National Chemical Laboratory Pune India Chemical Engineering Department Government Engineering College Trissur India Expertise Center for Eco-Testing Laboratory (EXCEL) CSIR-Central Leather Research Institute Chennai India

Adsorption properties of layered anionic clay-composites for the removal of anionic dyes from water were studied. The dye adsorption capacities of the composites were higher than the pristine clay. The clay-alginate composite with 5.9% alginate showed highest adsorption for both the dyes. The maximum adsorption capacity of the composite was enhanced by 51% for Acid Green 25 and 160% for Acid Green 27, compared to the pristine layered clay sample. The adsorption isotherm data were fitted to the Langmuir, Freundlich and Temkin isotherm models. The isotherm data could be explained well using the Freundlich isotherm model. Adsorption kinetics was analyzed using normal first order and Lagergren first order kinetic models.

关键词： Layered Clay Sodium Alginate Composite Adsorption Acid Green 25 Acid Green 27 Isotherm Kinetics

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Inherently safer reactor design for complex reactions based on calorimetry studies

Inherently safer reactor design for complex reactions based ...

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2011 AIChE Spring Meeting and 7th Global Congress on process Safety, 11AIChE

作者： Pineda-Solano, Alba L. Saenz-Noval, Lina Carreto-Vazquez, Victor H. Rogers, William J. Mannan, Sam Gao, Jun Papadaki, Maria Waldram, Simon Nayak, Subramanya Mary Kay O'Connor Process Safety Center Artie McFerrin Department of Chemical Engineering Texas A and M University College Station TX 77843-3122 United States IPSE SPEME University of Leeds LS2 9JT United Kingdom Department of Environmental and Natural Resources Management University of Ioannina Seferi 2 Agrinio GR 30100 Greece Chemical Engineering Program Texas A and M University at Qatar PO Box 23874 Doha Qatar

ISBN: (纸本)9780816910670

The N-oxidation of alkylpyridines by hydrogen peroxide is a reaction widely used in the pharmaceutical industry. This reaction is accompanied by the undesired gas-generating decomposition reaction of hydrogen peroxide. The oxygen generation, combined with the flammability of the alkylpyridines, represents a serious hazard of fire and explosion. In this work, a new operation strategy and reactor type for the N-oxidation of alkylpyridines are proposed based on calorimetrically obtained data. Previous studies on this system [8] showed that Langmuir-Hinshelwood type kinetics fits well with the Noxidation of this family of reactions and that increased temperature and catalyst concentration favor the N-oxidation reaction. New calorimetric measurements have been performed over an extended range of temperatures and catalyst concentrations in a closed reactor. These measurements confirm that the N-oxidation of alkylpyridines can actually be performed in a much more efficient and inherently safer manner if a closed reactor is used. The advantages and characteristics of such a reactor are explained and a preliminary design is proposed.

关键词： Calorimetry

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Biomass-Based Discrete Furan Oligomers as Materials for Electrochromic Devices

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ACS Sustainable Chemistry and engineering 2024年第1期12卷 459-469页

作者： Atayde, Eduardo C. Fong, Guan-Lun Yeh, Jyun-Yi Matsagar, Babasaheb M. Wang, Yu-Cheng Chen, De-Chian Peng, Chi-How Li, Yi-Pei Yamauchi, Yusuke Ho, Kuo-Chuan Wu, Kevin C.-W. Molecular Science and Technology Program Taiwan International Graduate Program (TIGP-MST) Academia Sinica No. 128 Sec. 2 Academia Road Taipei 11529 Taiwan Department of Chemistry National Tsing Hua University No. 101 Sec. 2 Kuang-Fu Road Hsinchu 30013 Taiwan Department of Chemical Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan Sustainable Chemical Science and Technology Program Taiwan International Graduate Program (TIGP-SCST) Academia Sinica No. 128 Sec. 2 Academia Road Taipei 11529 Taiwan School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN) The University of Queensl Brisbane 4072 QLD Australia Department of Materials Process Engineering Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan Institute of Polymer Science and Engineering National Taiwan University No.1 Sec. 4 Roosevelt Rd. Taipei 10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University No. 135 Yuandong Rd. Taoyuan 320 Taiwan

Electrochromic devices (ECDs) are materials that can undergo reversible changes in transmittance when exposed to different applied potentials. While many conjugated heterocyclic oligomers, such as oligothiophenes, have been developed for this purpose, there is no reported study on the use of discrete oligomeric furans as ECD materials. In this work, we introduce a furan trimer that can be utilized as a discrete electrochromic material, which transitions from light yellow to red and has a very high coloration efficiency of 1940 cm²/C at 507 nm. We propose that the reversible π-stack formation of the oligomer radical cations is behind this phenomenon, as evidenced by both experimental and computational results. The derivability of this oligomer from biomass and its facile synthesis make it an interesting alternative for other existing organic electrochromic materials. © 2023 American chemical Society

关键词： electrochromism furan oligomer hydroxyalkylation−alkylation reaction solvatochromism π-stacks

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Color and COD degradation in photocatalytic process of procion red by using TiO2 catalyst under solar irradiation

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AIP Conference Proceedings 2017年第1期1903卷

作者： Melati Ireng Sari Tuty Emilia Agustina Elda Melwita Tine Aprianti 1Graduate Program Student Chemical Engineering Magister Program Engineering Faculty Universitas Sriwijaya Indonesia 2Chemical Engineering Department Engineering Faculty Universitas Sriwijaya Indonesia

Increasing textile industries in Indonesia resulted in increasing the utilization of dyes. The use of synthetic dyes are still dominating because they have many advantages. But, synthetic dyes are difficult to decompose in nature so they can cause potential pollution if discharged directly into the environment. In this study, Procion Red was used as a model of synthetic dye wastewater. The objective of this research is to study the effect of TiO2 catalyst concentration and irradiation time on the degradation of Procion Red under solar irradiation. Photo degradation takes place by using TiO2 catalyst powder in the various concentration of Procion Red of 150-300 ppm. The various concentrations of TiO2 catalyst of 0.5-8 g/l were used. The color and COD degradation of Procion Red for 12 hours of solar irradiation were investigated. Color degradation was measured by using a spectrophotometer. While COD degradation was measured by using Ferrous Ammonium Sulfate (FAS) analysis method. The result showed when using Procion Red of 150 ppm, the highest color degradation of 100% was achieved by using TiO2 catalyst of 6 g/l and the highest COD degradation of 62% was obtained by using TiO2 catalyst of 8 g/l, under 12 hours of solar irradiation

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Quality analog rice composite flour: Modified starch, Colocasia esculenta, Canna edulis Ker high protein

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AIP Conference Proceedings 2018年第1期1977卷

作者： Isti Pudjihastuti Siswo Sumardiono Edy Supriyo Heny Kusumayanti 1Vocational Program Study of Chemical Engineering Diponegoro University Semarang Indonesia 2Chemical Engineering Department Faculty of Engineering Diponegoro University Semarang Indonesia

The demand for domestic rice continues to increase along with population growth, making it difficult for the achievement of national rice self-sufficiency. Therefore, it is necessary to decrease rice demand with food diversification program. Since paddy rice and rice have become food culture of Indonesian people, it is necessary to develop product similar to rice (analog rice) by not changing food preparation at the household level. The purpose of this research is to develop analog rice production method from protein rich composite flour with hot extrusion method. Thermal extrusion technology is expected to produce artificial rice with high quality and nutrition and have physicochemical properties equivalent of rice. There fore, it can be applied as food substitute for rice in realizing Indonesia food security program. The result of chemical analysis shows that the best analog rice in this study contains water 13.455%, carbohydrate 74.972%, protein 8.648% and fat 0.180%. Analog rice amylose content equal to 25.677% included in rice with low amylose.

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Synthesis of geopolymer from biomass-coal ash blends

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AIP Conference Proceedings 2017年第1期1887卷

作者： Tjokorde Walmiki Samadhi Winny Wulandari Muhammad Iqbal Prasetyo Muhammad Rizki Fernando Aprilina Purbasari 1Chemical Engineering Program Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia 2Chemical Engineering Department Faculty of Engineering Universitas Diponegoro Semarang Indonesia

Geopolymer is an environmentally attractive Portland cement substitute, owing to its lower carbon footprint and its ability to consume various aluminosilicate waste materials as its precursors. This work describes the development of geopolymer formulation based on biomass-coal ash blends, which is predicted to be the prevalent type of waste when biomass-based thermal energy production becomes mainstream in Indonesia. The ash blends contain an ASTM Class F coal fly ash (FA), rice husk ash (RHA), and coconut shell ash (CSA). A mixture of Na2SiO3 and concentrated KOH is used as the activator solution. A preliminary experiment identified the appropriate activator/ash mass ratio to be 2.0, while the activator Na2SiO3/KOH ratio varies from 0.8 to 2.0 with increasing ash blend Si/Al ratio. Both non-blended FA and CSA are able to produce geopolymer mortars with 7-day compressive strength exceeding the Indonesian national SNI 15-2049-2004 standard minimum value of 2.0 MPa stipulated for Portland cement mortars. Ash blends have to be formulated with a maximum RHA content of approximately 50 %-mass to yield satisfactory 7-day strength. No optimum ash blend composition is identified within the simplex ternary ash blend compositional region. The strength decreases with Si/Al ratio of the ash blends due to increasing amount of unreacted silicate raw materials at the end of the geopolymer hardening period. Overall, it is confirmed that CSA and blended RHA are feasible raw materials for geopolymer production..

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Analog rice characteristics made from sago flour and arrowroot flour in supporting food diversification

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AIP Conference Proceedings 2019年第1期2114卷

作者： Isti Pudjihastuti Siswo Sumardiono Edy Supriyo Heny Kusumayanti 1Vocational Program Study of Chemical Engineering Universitas Diponegoro Semarang Central Java Indonesia 2Chemical Engineering Department Faculty of Engineering Universitas Diponegoro Semarang Central Java Indonesia

Food security of a country is classified ideal if the food needs of the people have been met in terms of quantity and nutrition evenly. One alternative in achieving national food security is food diversification. Analog rice is one of the diversification of foods made from various kinds of flour as the ingredients. It is an alternative food substitute for rice. The purpose of the present study was to create and test the characteristics of analog rice made from sago flour and arrowroot flour. The parameters observed were water content, water absorption and texture. The treatment of the research was the variation of the ratio between sago flour and arrowroot flour, namely: 50:50, 60:40, 70:30, 80:20, and 90:10. This research produces analog rice with water content ranging from 11.250%-13.325%, water absorption capacity of 175%-208%, and analog rice texture from the ratio 90:10.

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Synergistic Effect of Fe Nanoparticles Supported on Nanoporous Carbon for Catalyzing Hydrogen Storage Properties of Mg(Bh4)2

SSRN

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SSRN 2023年

作者： Wahab, Md. Abdul Karim, Mohammad Rezaul Al-Mubaddel, Fahad S. Sindan, A. Will, Geoffrey Abdala, Ahmed Nanomaterials Centre Australian Institute for Bioengineering and Nanotechnology The University of Queensland St Lucia BrisbaneQLD4072 Australia Energy and Process Engineering Division School of Mechanical Medical and Process Engineering Science and Engineering Faculty Queensland University of Technology 2 George Street QLD4001 Australia Chemical Engineering Program Texas A and M University Education City Doha Qatar King Saud University Riyadh11421 Saudi Arabia K.A. CARE Energy Research and Innovation Center King Saud University Riyadh11451 Saudi Arabia Chemical Engineering Department King Saud University PO Box 800 Riyadh11421 Saudi Arabia

This study investigates synergistic effects of Fe nanoparticles (FeNPs) supported on mesoporous carbon (MC) for catalyzing hydrogen storage properties of Mg(BH4)2 (MBH). The study compares two methods for dispersing Fe NPs in MC: (i) ultrasonication nanoconfinement (un) and (ii) postnanoconfinement (pn) via stirring. Based on the results, it is found that the ultrasonication nanoconfinement method can effectively disperse the FeNPs with 5 nm in MC support (FeNP-unMC), later which can efficiently confine MBH (FeNP-un-MC@MBH system). The hydrogen (H2) desorption properties of the FeNP-un-MC@MBH system were found to be better than that of postconfinement-mediated FeNP-pn-MC@MBH system. For instance, H2 started to desorb from the FeNP-un-MC@MBH system at only 66°C (Tonset) and reached its peak at ~153°C, compared to 270°C (Tonset) and its peak ~350°C for pure MBH, respectively. The ultrasonication-mediated nanoconfined FeNP-un-MC@MBH system released a total of 7.01 wt% H2 within 90 minutes at 350°C. The study shows that the activation energy (Ea) of FeNP-un-MC@MBH is 19.57 kJ/mol, achieved due to the improved dehydrogenation kinetics of MBH. These improvements are due to the synergistic effects of nano-compartmentalization and highly dispersed Fe NP catalyst sites in the MC support. The research emphasizes the promising application of ultrasonication-mediated nanoconfined Fe NPs in mesoporous carbon which can be used as an effective catalyst for enhancing the hydrogen storage properties of metal-based hydrides (MBH). © 2023, The Authors. All rights reserved.

关键词： Hydrogen storage

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Catalytic and thermal cracking processes of waste cooking oil for bio-gasoline synthesis

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AIP Conference Proceedings 2017年第1期1823卷

作者： Muhammad Andry Rizki Dewanto Aulia Azka Januartrika Heny Dewajani Arief Budiman 1Chemical Engineering Department Universitas Gadjah Mada Jalan Grafika 2 Yogyakarta 55281 Indonesia 2Chemical Engineering Program The State Polytechnic of Malang Jalan Sukarno Hatta 9 Malang 65141 Indonesia

Non-renewable energy resources such as fossil fuels, and coal were depleted as the increase of global energy demand. Moreover, environmental aspect becomes a major concern which recommends people to utilize bio-based resources. Waste cooking oil is one of the economical sources for biofuel production and become the most used raw material for biodiesel production. However, the products formed during frying, can affect the trans-esterification reaction and the biodiesel properties. Therefore, it needs to convert low-quality cooking oil directly into biofuel by both thermal and catalytic cracking processes. Thermal and catalytic cracking sometimes are regarded as prospective bio-energy conversion processes. This research was carried out in the packed bed reactor equipped with 2 stages preheater with temperature of reactor was variated in the range of 450-550°C. At the same temperature, catalytic cracking had been involved in this experiment, using activated ZSM-5 catalyst with 1 cm in length. The organic liquid product was recovered by three stages of double pipe condensers. The composition of cracking products were analyzed using GC-MS instrument and the caloric contents were analyzed using Bomb calorimeter. The results reveal that ZSM-5 was highly selective toward aromatic and long aliphatic compounds formation. The percentage recovery of organic liquid product from the cracking process varies start from 8.31% and the optimal results was 54.08%. The highest heating value of liquid product was resulted from catalytic cracking process at temperature of 450°C with value of 10880.48 cal/gr and the highest product yield with 54.08% recovery was achieved from thermal cracking process with temperature of 450°C.

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Morphological arrangement of two-dimensional aggregated colloid

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AIP Conference Proceedings 2017年第1期1858卷

作者： Sarunya Promkotra Tawiwan Kangsadan 1Department of Geotechnology Faculty of Technology KhonKaen University KhonKaen 40002 Thailand 2Chemical and Process Engineering Program Department of Mechanical and Process Engineering TheSirindhorn International Thai-German Graduate School of Engineering (TGGS) King Mongkut’s University of Technology North Bangkok (KMUTNB) Bangsue Bangkok 10800 Thailand

Two-dimensional aggregate morphologies can be controlled by adjusting the suspending alcohol and the composition of the substrate solution. Water-glycerol substrates were used in these experiments because their high viscosity minimizes vibration in floating 2D aggregates. The polystyrene microspheres, 4.0 µm in diameter, were suspended in alcohol-water solutions at 0.1 vol% solid fraction by adding appropriate amounts of the as-received dispersion to the alcohol. The resulting suspending phase contained 12 vol% water. Methanol and ethanol were used as the suspension medium for the particles. The substrate composition and the suspending medium alcohol were varied, leading to a better understanding of the effect of these variables on 2Daggregate morphology. Light alcohols, methanol and ethanol, formed the two-dimensional(2D) aggregated monolayers at the air-liquid interface. Also, high acidity in the liquid substrate (pH values below 6) was required for formation of 2D aggregates. Similarly, salt additions also induced particle aggregation. The 2D morphologies were classified by their fractal dimension, which increased with the concentration of glycerol and acid in the substrateliquid. In addition, both aggregates and isolated particles in the ethanol system showed anovel circular ring structure, which disappeared over time. Morphology diagrams for the 2D aggregates were developed; these diagrams showed the fractal dimension of the clusteras a function of the formation conditions.

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