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Preparation of Antimicrobial Iron Oxide Nanostructures from Galvanizing Effluent

World Journal of Nano Science and Engineering 2022年第1期12卷 1-11页

作者： Rajapakshe Babilage Sanjitha Dilan Rajapakshe Gonapala Deniyage Madhusha Chathurangi Gonapaladeniya Charith Anuruddha Thennakoon Prabath Nilan Gunasekara Nirosh Siriwardene Sudath Annasiwatte Sayuri Sammanani Niyangoda rajapakse mudiyanselage gamini rajapakse Department of Chemistry Faculty of Science University of Peradeniya Peradeniya Sri Lanka Post Graduate Institute of Science University of Peradeniya Peradeniya Sri Lanka LTL Galvanizers Pvt. Ltd. Makola Sri Lanka

Galvanization is the process of applying a protective zinc coating to iron or steel to prevent rusting. In the batch hot-dip galvanizing process, large amounts of wastes originate in liquid, solid and gaseous forms. Acidic waste containing iron and zinc ions is produced due to the cleaning of steel prior to zinc coating, which is considered the galvanizing acid waste. The galvanizing effluent used was collected from LTL Galvanizers Pvt. Ltd., Sapugaskanda, Sri Lanka, and converted into antimicrobial hematite (α-Fe2O3) nanoparticles. These nanoparticles were synthesized using a chemical precipitation method. X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) were used to characterize the nanomaterials produced. Two pathogenic bacteria and one pathogenic fungus were used to analyze the antimicrobial activity of the nanomaterials. All the samples showed excellent antibacterial and antifungal properties. And the material can inhibit the growth of both Gram-positive and Gram-negative bacteria. According to the SEM images, some of the hematite particles were around 100 nm in size or less, which confirms that the describing method is viable in synthesizing hematite nanostructures. As shown in the XRD, the major diffraction peak, located at 2θ of 35.617° (110) in addition to minor peaks at 24.87° (012), 33.07° (104), 42.08° (113), 51.18° (024), 53.52° (116) and, 57.46° (018) confirm the spinel structure of iron oxide (α-Fe2O3). The estimated average crystallite size of the nanomaterial is calculated to be 36.74 nm. The durability of the manufactured nanomaterial is excellent. This method is a time-efficient, environmentally friendly, cost-effective and industrially viable way to manufacture antimicrobial hematite (α-Fe2O3) nanomaterials from a galvanizing effluent.

关键词： Wastewater Treatment Galvanizing Effluent Antimicrobial Hematite Nanomaterials Iron Oxide Nanostructures Coprecipitation

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Low-Cost Dye-Sensitized Solar Cells Based on Interconnected FTO-Activated Carbon Nanoparticulate Counter Electrode Showing High Efficiency

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材料科学与工程（中英文A版） 2015年第9期5卷 361-368页

作者： Chandana Sampath Kumara Ranasinghe Eranji Nirmada Jayaweera Gamaralalage Rajanya Ashoka Kumara rajapakse mudiyanselage gamini rajapakse Herath mudiyanselage Navarathna Bandara Masamichi Yoshimura Department of Chemistry Faculty of Science University of Peradeniya Peradeniya 20400 Sri Lanka Postgraduate Institute of Science University of Peradeniya Peradeniya 20400 Sri Lanka Graduate School of Engineering Toyota Technological Institute 2-12-1 Hisakata Tempaku-ku Nagoya 468-8511 Japan

The development of low-cost DSCs (Dye-sensitized solar cells) based on activated carbon counter electrodes is described. Although, the use of activated carbon in CEs (Counter electrodes) has been documented, the efficiencies obtained in such solar cells have been low, particularly, due to low electrical conductivity of such counter electrodes. Our design of the counter electrode eliminates this problem by using an in-situ formed FTO (Fluorine-doped tin oxide)-activated carbon composite on FTO surface as the CE. The FTO particles are prepared by atomized spray pyrolysis method from a spray solution containing dispersed activated carbon particles. The CE thus prepared has a reasonable electronic conductivity and the composition of the spray solution was optimized to give the highest conversion efficiency and the thickness of the CE was optimized by controlling the spray duration and deposition temperature. The best DSC based on AC-FTO CE has a JSC of 18.98 mA·cm-2, a VOC of 0.709 V, and a FF (Fill factor) of 0.563 giving a conversion efficiency of 7.6%. The data for Pt-FTO CE based DSC are a JSC of 18.78 mA·cm-2, a VOC of 0.732 V, and a FF of 0.688 with a conversion efficiency of 9.5%.

关键词：染料敏化太阳能电池高效太阳能电池颗粒活性炭纳米电极 FTO 低成本喷雾热解法转换效率

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A Study on Pre-Induction Cervical Ripening with PGE2 Vaginal Tablet One (3 mg) vs. Half (1.5 mg) in Low Risk Multi Parous Mothers at 40 Weeks of Gestation

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Open Journal of Obstetrics and Gynecology 2021年第8期11卷 1005-1012页

作者： Naleen Ratnayake Ahangama Arachchige Nilanga Nishad Yahampath Arachchige gamini Perera Devasuriya Pathinayakalage Lanka Rasanjana Samarakoon mudiyanselage Sameera Gayanath Gunarathna Prabath Kularathna Abeysundara Castle Street Hospital for Women Colombo Sri Lanka Center for Epidemiological and Clinical Research LK Colombo Sri Lanka Worthing Hospital (NHS) Western Sussex UK

Backgrounds: Induction of labor is a common practice. In women with immature cervix, PGE2 is commonly used for pre-induction. We hypothesized that PGE2 1.5 mg may be equally effective to PGE2 3 mg in multiparous women for labor induction. The present effort was an attempt to compare the efficacy and effects of pre-induction cervical ripening with PGE2 3 mg vs. 1.5 mg in multi-parous mothers (2nd and 3rd Pregnancy) at 40 weeks.

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