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Pramanik SK, Bhuiyan M, Robert D, Roychand R, Gao L, Cole I, Pramanik BK. Bio-corrosion in concrete sewer systems: Mechanisms and mitigation strategies. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 921:171231. [PMID: 38417509 DOI: 10.1016/j.scitotenv.2024.171231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Revised: 02/21/2024] [Accepted: 02/22/2024] [Indexed: 03/01/2024]
Abstract
The deterioration of concrete sewer structures due to bio-corrosion presents critical and escalating challenges from structural, economic and environmental perspectives. Despite decades of research, this issue remains inadequately addressed, resulting in billions of dollars in maintenance costs and a shortened service life for sewer infrastructure worldwide. This challenge is exacerbated by the absence of standardized test methods and universally accepted mitigation strategies, leaving industries and stakeholders confronting an increasingly pressing problem. This paper aims to bridge this knowledge gap by providing a comprehensive review of the complex mechanisms of bio-corrosion, focusing on the formation and accumulation of hydrogen sulfide, its conversion into sulfuric acid and the subsequent deterioration of concrete materials. The paper also explores various factors affecting bio-corrosion rates, including environmental conditions, concrete properties and wastewater characteristics. The paper further highlights existing corrosion test strategies, such as chemical tests, in-situ tests and microbial simulations tests along with their general analytical parameters. The conversion of hydrogen sulfide into sulfuric acid is a primary cause of concrete decay and its progression is influenced by environmental conditions, inherent concrete characteristics, and the composition of wastewater. Through illustrative case studies, the paper assesses the practical implications and efficacy of prevailing mitigation techniques. Coating materials provide a protective barrier against corrosive agents among the discussed techniques, while optimised concrete mix designs enhance the inherent resistance and durability of the concrete matrix. Finally, this review also outlines the future prospects and challenges in bio-corrosion research with an aim to promote the creation of more resilient and cost-efficient materials for sewer systems.
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Affiliation(s)
| | - Muhammed Bhuiyan
- School of Engineering, RMIT University, Melbourne, VIC 3000, Australia.
| | - Dilan Robert
- School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Rajeev Roychand
- School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Li Gao
- South East Water, Frankston, Victoria 3199, Australia
| | - Ivan Cole
- School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
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Aina ST, Kyomuhimbo HD, Du Plessis B, Mjimba V, Haneklaus N, Brink HG. Cytotoxic-Ag-Modified Eggshell Membrane Nanocomposites as Bactericides in Concrete Mortar. Int J Mol Sci 2023; 24:15463. [PMID: 37895142 PMCID: PMC10607369 DOI: 10.3390/ijms242015463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 10/16/2023] [Accepted: 10/18/2023] [Indexed: 10/29/2023] Open
Abstract
Against the backdrop of escalating infrastructure budgets worldwide, a notable portion-up to 45%-is allocated to maintenance endeavors rather than innovative infrastructure development. A substantial fraction of this maintenance commitment involves combatting concrete degradation due to microbial attacks. In response, this study endeavors to propose a remedial strategy employing nano metals and repurposed materials within cement mortar. The methodology entails the adsorption onto eggshell membranes (ESM) of silver nitrate (ESM/AgNO3) or silver nanoparticles (ESM/AgNPs) yielding silver-eggshell membrane composites. Subsequently, the resulting silver-eggshell membrane composites were introduced in different proportions to replace cement, resulting in the formulation of ten distinct mortar compositions. A thorough analysis encompassing a range of techniques, such as spectrophotometry, scanning electron microscopy, thermogravimetric analysis, X-ray fluorescence analysis, X-ray diffraction (XRD), and MTT assay, was performed on these composite blends. Additionally, evaluations of both compressive and tensile strengths were carried out. The mortar blends 3, 5, and 6, characterized by 2% ESM/AgNO3, 1% ESM/AgNPs, and 2% ESM/AgNPs cement replacement, respectively, exhibited remarkable antimicrobial efficacy, manifesting in substantial reduction in microbial cell viability (up to 50%) of typical waste activated sludge. Concurrently, a marginal reduction of approximately 10% in compressive strength was noted, juxtaposed with an insignificant change in tensile strength. This investigation sheds light on a promising avenue for addressing concrete deterioration while navigating the balance between material performance and structural integrity.
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Affiliation(s)
- Samuel Tomi Aina
- Department of Chemical Engineering, University of Pretoria, Pretoria 0002, South Africa; (S.T.A.); (H.D.K.); (B.D.P.)
| | - Hilda Dinah Kyomuhimbo
- Department of Chemical Engineering, University of Pretoria, Pretoria 0002, South Africa; (S.T.A.); (H.D.K.); (B.D.P.)
| | - Barend Du Plessis
- Department of Chemical Engineering, University of Pretoria, Pretoria 0002, South Africa; (S.T.A.); (H.D.K.); (B.D.P.)
| | - Vuyo Mjimba
- Human Sciences Research Council, 134 Pretorius Street, Pretoria 0083, South Africa;
| | - Nils Haneklaus
- Td Lab Sustainable Mineral Resources, University for Continuing Education Krems, Dr.-Karl-Dorrek-Straße 30, 3500 Krems, Austria;
| | - Hendrik Gideon Brink
- Department of Chemical Engineering, University of Pretoria, Pretoria 0002, South Africa; (S.T.A.); (H.D.K.); (B.D.P.)
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Ortega-Nieto C, Losada-Garcia N, Prodan D, Furtos G, Palomo JM. Recent Advances on the Design and Applications of Antimicrobial Nanomaterials. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2406. [PMID: 37686914 PMCID: PMC10490178 DOI: 10.3390/nano13172406] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 08/21/2023] [Accepted: 08/22/2023] [Indexed: 09/10/2023]
Abstract
Present worldwide difficulties in healthcare and the environment have motivated the investigation and research of novel materials in an effort to find novel techniques to address the current challenges and requirements. In particular, the use of nanomaterials has demonstrated a significant promise in the fight against bacterial infections and the problem of antibiotic resistance. Metal nanoparticles and carbon-based nanomaterials in particular have been highlighted for their exceptional abilities to inhibit many types of bacteria and pathogens. In order for these materials to be as effective as possible, synthetic techniques are crucial. Therefore, in this review article, we highlight some recent developments in the design and synthesis of various nanomaterials, including metal nanoparticles (e.g., Ag, Zn, or Cu), metal hybrid nanomaterials, and the synthesis of multi-metallic hybrid nanostructured materials. Following that, examples of these materials' applications in antimicrobial performance targeted at eradicating multi-drug resistant bacteria, material protection such as microbiologically influenced corrosion (MIC), or additives in construction materials have been described.
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Affiliation(s)
- Clara Ortega-Nieto
- Instituto de Catálisis y Petroleoquímica (ICP), CSIC, c/Marie Curie 2, 28049 Madrid, Spain; (C.O.-N.); (N.L.-G.)
| | - Noelia Losada-Garcia
- Instituto de Catálisis y Petroleoquímica (ICP), CSIC, c/Marie Curie 2, 28049 Madrid, Spain; (C.O.-N.); (N.L.-G.)
| | - Doina Prodan
- Department of Dental Composite Materials, Raluca Ripan Institute of Research in Chemistry, Babes-Bolyai University, 30 Fantanele St., 400294 Cluj-Napoca, Romania;
| | - Gabriel Furtos
- Department of Dental Composite Materials, Raluca Ripan Institute of Research in Chemistry, Babes-Bolyai University, 30 Fantanele St., 400294 Cluj-Napoca, Romania;
| | - Jose M. Palomo
- Instituto de Catálisis y Petroleoquímica (ICP), CSIC, c/Marie Curie 2, 28049 Madrid, Spain; (C.O.-N.); (N.L.-G.)
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Ślosarczyk A, Klapiszewska I, Parus A, Balicki S, Kornaus K, Gapiński B, Wieczorowski M, Wilk KA, Jesionowski T, Klapiszewski Ł. Antimicrobial action and chemical and physical properties of CuO-doped engineered cementitious composites. Sci Rep 2023; 13:10404. [PMID: 37369694 DOI: 10.1038/s41598-023-37673-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 06/26/2023] [Indexed: 06/29/2023] Open
Abstract
CuO nanoparticles (NPs) were added to cement matrices in quantities of 0.25, 0.50 and 1.00 wt% to inhibit the growth of Gram-positive (Bacillus cereus, Staphylococcus aureus) and Gram-negative (Pseudomonas aeruginosa, Escherichia coli) bacteria. It was shown that CuO NPs, in all tested concentrations, improved the antibacterial properties of the cement matrix. Nevertheless, the best mechanical, structural and durability properties were obtained for cement composites doped with CuO NPs at 0.25 wt%. Larger amounts of NPs caused a decrease in all parameters relative to the reference mortar, which may be the result of a slight change in the porosity of the composite microstructure. For 0.50 wt% CuO NPs, a slight increase in the volume of micropores in the cement matrix was observed, and an increased number of larger pores was confirmed by non-invasive computed tomography (CT). The reduction in the mechanical parameters of composites with 0.50 and 1.00 wt% CuO NPs may also be due to the slower hydration of the cement binder, as confirmed by changes in the heat of hydration for these configurations, or agglomeration of NPs, especially for the 1.00 wt% concentration, which was manifested in a decrease in the plasticity of the mortars.
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Affiliation(s)
- Agnieszka Ślosarczyk
- Institute of Building Engineering, Faculty of Civil and Transport Engineering, Poznan University of Technology, 60965, Poznan, Poland.
| | - Izabela Klapiszewska
- Institute of Building Engineering, Faculty of Civil and Transport Engineering, Poznan University of Technology, 60965, Poznan, Poland
| | - Anna Parus
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, 60965, Poznan, Poland
| | - Sebastian Balicki
- Department of Engineering and Technology of Chemical Processes, Faculty of Chemistry, Wroclaw University of Science and Technology, 50370, Wrocław, Poland
| | - Kamil Kornaus
- Department of Ceramics and Refractories, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30059, Kraków, Poland
| | - Bartosz Gapiński
- Institute of Mechanical Technology, Faculty of Mechanical Engineering, Poznan University of Technology, 60965, Poznan, Poland
| | - Michał Wieczorowski
- Institute of Mechanical Technology, Faculty of Mechanical Engineering, Poznan University of Technology, 60965, Poznan, Poland
| | - Kazimiera A Wilk
- Department of Engineering and Technology of Chemical Processes, Faculty of Chemistry, Wroclaw University of Science and Technology, 50370, Wrocław, Poland
| | - Teofil Jesionowski
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, 60965, Poznan, Poland
| | - Łukasz Klapiszewski
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, 60965, Poznan, Poland.
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Leong CY, Wahab RA, Lee SL, Ponnusamy VK, Chen YH. Current perspectives of metal-based nanomaterials as photocatalytic antimicrobial agents and their therapeutic modes of action: A review. ENVIRONMENTAL RESEARCH 2023; 227:115578. [PMID: 36848977 DOI: 10.1016/j.envres.2023.115578] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 02/04/2023] [Accepted: 02/24/2023] [Indexed: 05/08/2023]
Abstract
Efforts to restrict the emergence and progression of multidrug-resistant bacterial strains should heavily involve the scientific community, including government bodies, researchers, and industries, in developing new and effective photocatalytic antimicrobial agents. Such changes warrant the modernization and upscaling of materials synthesis laboratories to support and expedite the mass production of materials at the industrial scale for the benefit of humankind and the environment. Despite the massive volume of publications reporting the potential usage of different types of metal-based nanomaterials as antimicrobial agents, reviews uncovering the similarities and differences among the various products remain lacking. This review details the basic and unique properties of metal-based nanoparticles, their use as photocatalytic antimicrobial agents, and their therapeutic modes of action. It shall be noted that compared to traditional antibiotics, the mode of action of photocatalytic metal-based nanomaterials for killing microorganisms are completely different, despite displaying promising performance against antibiotic-resistant bacteria. Besides, this review uncovers the differences in the mode of actions of metal oxide nanoparticles against different types of bacteria, as well as towards viruses. Last but not least, this review comprehensively describes previous published clinical trials and medical usages involving contemporary photocatalytic antimicrobial agents.
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Affiliation(s)
- Cheng Yee Leong
- Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310, Johor Bahru, Johor, Malaysia; Centre for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310, Johor Bahru, Johor, Malaysia
| | - Roswanira Abdul Wahab
- Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310, Johor Bahru, Johor, Malaysia; Advanced Membrane Technology Research Centre (AMTEC), Universiti Teknologi Malaysia, 81310, Johor Bahru, Johor, Malaysia
| | - Siew Ling Lee
- Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310, Johor Bahru, Johor, Malaysia; Centre for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310, Johor Bahru, Johor, Malaysia.
| | - Vinoth Kumar Ponnusamy
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Research Center for Precision Environmental Medicine, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Department of Chemistry, College of Science, National Sun Yat-Sen University (NSYSU), Kaohsiung, 80424, Taiwan; Department of Medical Research, Kaohsiung Medical University Hospital (KMUH), Kaohsiung City, 807, Taiwan; Ph.D. Program of Aquatic Science and Technology, College of Hydrosphere Science, National Kaohsiung University of Science and Technology (NKUST), Kaohsiung City, 811, Taiwan.
| | - Yi-Hsun Chen
- Division of Gastroenterology, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
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Non-toxic self-cleaning large area cement blocks fabrication by biomimicking superhydrophobic periwinkle flowers. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129112] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Physicomechanical and Antimicrobial Characteristics of Cement Composites with Selected Nano-Sized Oxides and Binary Oxide Systems. MATERIALS 2022; 15:ma15020661. [PMID: 35057378 PMCID: PMC8779094 DOI: 10.3390/ma15020661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/13/2022] [Accepted: 01/14/2022] [Indexed: 11/26/2022]
Abstract
In recent years, increasing attention has been paid to the durability of building materials, including those based on cementitious binders. Important aspects of durability include the increase of the strength of the cement matrix and enhancement of material resistance to external factors. The use of nanoadditives may be a way to meet these expectations. In the present study, zinc, titanium and copper oxides, used in single and binary systems (to better the effect of their performance), were applied as additives in cement mortars. In the first part of this work, an extensive physicochemical analysis of oxides was carried out, and in the second, their application ranges in cement mortars were determined. The subsequent analyses were employed in determining the physicochemical properties of pristine oxides: Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray fluorescence (EDXRF), scanning electron microscopy (SEM), measurement of the particle size distribution, as well as zeta potential measurement depending on the pH values. Influence on selected physicomechanical parameters of the cement matrix and resistance to the action of selected Gram-positive and Gram-negative bacteria and fungi were also examined. Our work indicated that all nanoadditives worsened the mechanical parameters of mortars during the first 3 days of hardening, while after 28 days, an improvement was achieved for zinc and titanium(IV) oxides. Binary systems and copper(II) oxide deteriorated in strength parameters throughout the test period. In contrast, copper(II) oxide showed the best antibacterial activity among all the tested oxide systems. Based on the inhibitory effect of the studied compounds, the following order of microbial susceptibility to inhibition of growth on cement mortars was established (from the most susceptible, to the most resistant): E. coli < S. aureus < C. albicans < B. cereus = P. aeruginosa < P. putida.
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Ielo I, Giacobello F, Castellano A, Sfameni S, Rando G, Plutino MR. Development of Antibacterial and Antifouling Innovative and Eco-Sustainable Sol-Gel Based Materials: From Marine Areas Protection to Healthcare Applications. Gels 2021; 8:26. [PMID: 35049561 PMCID: PMC8774406 DOI: 10.3390/gels8010026] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/15/2021] [Accepted: 12/24/2021] [Indexed: 12/19/2022] Open
Abstract
Bacterial colonization of surfaces is the leading cause of deterioration and contaminations. Fouling and bacterial settlement led to damaged coatings, allowing microorganisms to fracture and reach the inner section. Therefore, effective treatment of surface damaged material is helpful to detach bio-settlement from the surface and prevent deterioration. Moreover, surface coatings can withdraw biofouling and bacterial colonization due to inherent biomaterial characteristics, such as superhydrophobicity, avoiding bacterial resistance. Fouling was a past problem, yet its untargeted toxicity led to critical environmental concerns, and its use became forbidden. As a response, research shifted focus approaching a biocompatible alternative such as exciting developments in antifouling and antibacterial solutions and assessing their antifouling and antibacterial performance and practical feasibility. This review introduces state-of-the-art antifouling and antibacterial materials and solutions for several applications. In particular, this paper focuses on antibacterial and antifouling agents for concrete and cultural heritage conservation, antifouling sol-gel-based coatings for filtration membrane technology, and marine protection and textile materials for biomedicine. In addition, this review discusses the innovative synthesis technologies of antibacterial and antifouling solutions and the consequent socio-economic implications. The synthesis and the related physico-chemical characteristics of each solution are discussed. In addition, several characterization techniques and different parameters that influence the surface finishing coatings deposition were also described.
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Affiliation(s)
- Ileana Ielo
- Institute for the Study of Nanostructured Materials, ISMN—CNR, c/o Department of ChiBioFarAm, University of Messina, Viale F. Stagno d’Alcontres 31, Vill. S. Agata, 98166 Messina, Italy; (I.I.); (F.G.); (A.C.); (S.S.)
| | - Fausta Giacobello
- Institute for the Study of Nanostructured Materials, ISMN—CNR, c/o Department of ChiBioFarAm, University of Messina, Viale F. Stagno d’Alcontres 31, Vill. S. Agata, 98166 Messina, Italy; (I.I.); (F.G.); (A.C.); (S.S.)
| | - Angela Castellano
- Institute for the Study of Nanostructured Materials, ISMN—CNR, c/o Department of ChiBioFarAm, University of Messina, Viale F. Stagno d’Alcontres 31, Vill. S. Agata, 98166 Messina, Italy; (I.I.); (F.G.); (A.C.); (S.S.)
| | - Silvia Sfameni
- Institute for the Study of Nanostructured Materials, ISMN—CNR, c/o Department of ChiBioFarAm, University of Messina, Viale F. Stagno d’Alcontres 31, Vill. S. Agata, 98166 Messina, Italy; (I.I.); (F.G.); (A.C.); (S.S.)
- Department of Engineering, University of Messina, Contrada di Dio, Vill. S. Agata, 98166 Messina, Italy
| | - Giulia Rando
- Department of Chemical, Biological, Pharmaceutical and Analytical Sciences (ChiBioFarAm), University of Messina, Viale F. Stagno d’Alcontres 31, Vill. S. Agata, 98166 Messina, Italy;
| | - Maria Rosaria Plutino
- Institute for the Study of Nanostructured Materials, ISMN—CNR, c/o Department of ChiBioFarAm, University of Messina, Viale F. Stagno d’Alcontres 31, Vill. S. Agata, 98166 Messina, Italy; (I.I.); (F.G.); (A.C.); (S.S.)
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Bai X, He B, Han P, Xie R, Sun F, Chen Z, Wang Y, Liu X. Corrosion behavior and mechanism of X80 steel in silty soil under the combined effect of salt and temperature. RSC Adv 2021; 12:129-147. [PMID: 35424483 PMCID: PMC8978660 DOI: 10.1039/d1ra08249c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 12/11/2021] [Indexed: 12/23/2022] Open
Abstract
In this study, X80 pipeline steel was embedded in silty soil with different salinities and subjected to corrosion at a constant temperature for 24 h before electrochemical testing. The effect of soil medium, temperature, and salt content on the kinetics of corrosion behavior of X80 steel was analyzed. Furthermore, the compositions and structures of the corrosion products were analyzed by X-ray photoelectron spectroscopy and scanning electron microscopy. Based on the results, the anodic dissolution reaction mechanism of X80 steel in silty soil was determined, the differences in the corrosion process caused by different soil systems were comprehensively contrasted, and the impact of the migration process of heterogeneous silty soil on corrosion behavior under different conditions was systematically explored. Comparative analysis revealed that chloride ions possess strong adsorption ability at temperatures above freezing point and that more oxidized substances are present in the deposited layer on the surface of corroded steel, which facilitates the occurrence of corrosion under deposition. At temperatures below freezing point, the sulfate ions present in the pore solution contribute to crystallization-induced expansion and lead to swelling and deformation of the soil, rendering the X80 steel more prone to corrosion in sulfate corrosion environments.
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Affiliation(s)
- Xiangling Bai
- College of Civil Engineering, Taiyuan University of Technology Taiyuan 030024 P. R. China
| | - Bin He
- College of Civil Engineering, Taiyuan University of Technology Taiyuan 030024 P. R. China
| | - Pengju Han
- College of Civil Engineering, Taiyuan University of Technology Taiyuan 030024 P. R. China
| | - Ruizhen Xie
- Mechanics Institute, Jinzhong University Jinzhong 030619 P. R. China
| | - Funan Sun
- College of Civil Engineering, Taiyuan University of Technology Taiyuan 030024 P. R. China
| | - Zhiwei Chen
- College of Civil Engineering, Taiyuan University of Technology Taiyuan 030024 P. R. China
| | - Yuting Wang
- College of Civil Engineering, Taiyuan University of Technology Taiyuan 030024 P. R. China
| | - Xinyu Liu
- College of Civil Engineering, Taiyuan University of Technology Taiyuan 030024 P. R. China
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Abstract
Concrete sewer pipes can be corroded by the biogenic sulfuric acid (H2SO4) generated from microbiological activities in a process called biocorrosion or microbiologically induced corrosion (MIC). In this study, inhibitors that can reduce Acidithiobacillus thiooxidans growth and thus may reduce the accumulation of biofilm components responsible for the biodegradation of concrete were used. D-tyrosine, tetrakis hydroxymethyl phosphonium sulfate (THPS) and TiO2 nanoparticles were investigated as potential inhibitors of sulfur-oxidizing bacteria (SOB) growth. Results showed that most of the chemicals used can inhibit SOB growth at a concentration lower than 100 mg/L. TiO2 nanoparticles exhibited the highest biocide effect and potential biocorrosion mitigation activity, followed by D-tyrosine and THPS.
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Self-Cleaning Coatings and Surfaces of Modern Building Materials for the Removal of Some Air Pollutants. MATERIALS 2021; 14:ma14092161. [PMID: 33922766 PMCID: PMC8123039 DOI: 10.3390/ma14092161] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 04/20/2021] [Accepted: 04/21/2021] [Indexed: 11/17/2022]
Abstract
Air quality is one of the most important problems of the modern world, as it determines human health and changes occurring in other elements of nature, including climate change. For this reason, actions are taken to reduce the amount of harmful substances in the air. One such action is the use of building materials with special properties achieved by the application of self-cleaning coatings and photocatalytic additives. This article presents achievements in the field of additives and modifiers for building materials, whose task is to improve air quality. Concrete, cement, paints, and facade coatings modified based on the achievements of nanotechnology have been analyzed in terms of new properties and the possibility of their application in the area of modern environmental requirements. Both positive aspects and doubts were described in the scope of the effective reduction of the amount of gases such as VOC, NOx, dust and microorganisms.
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