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Abad A, Gerassis S, Saavedra Á, Giráldez E, García JF, Taboada J. A Bayesian assessment of occupational health surveillance in workers exposed to silica in the energy and construction industry. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:29560-29569. [PMID: 30121763 DOI: 10.1007/s11356-018-2962-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2017] [Accepted: 08/14/2018] [Indexed: 06/08/2023]
Abstract
Medical records generated during occupational health surveillance processes have large amounts of unexploited information that can help to reduce silica-related health risks and many occupational diseases. The methodology applied in this study consists in analyzing through machine learning techniques a database with 70,000 medical examinations from workers in the energy and construction industry in Spain. First, a general unsupervised Bayesian model is built and node force analysis is used to identify the factors with the greatest impact on the worker's health surveillance process. Second, a predictive Bayesian model is created and mutual information is employed to assess the more relevant factors affecting the medical capability of workers exposed to silica dust. The lung auscultation and the breathing exploration are the two factors that influence the most the medical capability of silica-exposed employees. Probabilistic inference shows a remarkable gender effect, where women present more resilience towards occupational diseases than men showing a higher proportion of normal results in certain key factors, such as body mass index (♀49.73%, ♂25.17%) or spirometry (♀53.73%, ♂48.91%). Finally, environmental conditions demonstrate to have a major influence on spatial variability of occupational diseases. The design of health prevention programs based on geographical variations can be crucial to the attainment of an ongoing and sustained healthier workforce with a reduction in the number of chronic workplace illnesses.
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Affiliation(s)
- Alberto Abad
- Department of Natural Resources and Environmental Engineering, University of Vigo, Lagoas Marcosende, 36310, Vigo, Spain
| | - Saki Gerassis
- Department of Natural Resources and Environmental Engineering, University of Vigo, Lagoas Marcosende, 36310, Vigo, Spain
| | - Ángeles Saavedra
- Department of Statistics and Operational Research, University of Vigo, Lagoas Marcosende, 36310, Vigo, Spain.
| | - Eduardo Giráldez
- Department of Natural Resources and Environmental Engineering, University of Vigo, Lagoas Marcosende, 36310, Vigo, Spain
| | - Julio F García
- Department of Natural Resources and Environmental Engineering, University of Vigo, Lagoas Marcosende, 36310, Vigo, Spain
| | - Javier Taboada
- Department of Natural Resources and Environmental Engineering, University of Vigo, Lagoas Marcosende, 36310, Vigo, Spain
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Boroumand Jazi M, Arshadi M, Amiri M, Gil A. Kinetic and thermodynamic investigations of Pb(II) and Cd(II) adsorption on nanoscale organo-functionalized SiO2Al2O3. J Colloid Interface Sci 2014; 422:16-24. [DOI: 10.1016/j.jcis.2014.01.032] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2013] [Revised: 01/16/2014] [Accepted: 01/23/2014] [Indexed: 10/25/2022]
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Johari K, Saman N, Mat H. A comparative evaluation of mercury(II) adsorption equilibrium and kinetics onto silica gel and sulfur-functionalised silica gels adsorbents. CAN J CHEM ENG 2013. [DOI: 10.1002/cjce.21949] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Khairiraihanna Johari
- Advanced Materials and Process Engineering Laboratory, Faculty of Chemical Engineering; Universiti Teknologi Malaysia; 81310 UTM Skudai Johor Malaysia
| | - Norasikin Saman
- Advanced Materials and Process Engineering Laboratory, Faculty of Chemical Engineering; Universiti Teknologi Malaysia; 81310 UTM Skudai Johor Malaysia
| | - Hanapi Mat
- Advanced Materials and Process Engineering Laboratory, Faculty of Chemical Engineering; Universiti Teknologi Malaysia; 81310 UTM Skudai Johor Malaysia
- Novel Materials Research Group, Nanotechnology Research Alliance; Universiti Teknologi Malaysia; 81310 UTM Skudai Johor Malaysia
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A gentle method to graft thiol-functional groups onto silica gel for adsorption of silver ions and immobilization of silver nanoparticles. POWDER TECHNOL 2013. [DOI: 10.1016/j.powtec.2012.10.015] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Arshadi M, Ghiaci M, Gil A. Schiff Base Ligands Immobilized on a Nanosized SiO2–Al2O3 Mixed Oxide as Adsorbents for Heavy Metals. Ind Eng Chem Res 2011. [DOI: 10.1021/ie2015153] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mohammad Arshadi
- Department of Chemistry, Isfahan University of Technology, Isfahan, Iran, 8415683111
| | - Mehran Ghiaci
- Department of Chemistry, Isfahan University of Technology, Isfahan, Iran, 8415683111
| | - Antonio Gil
- Department of Applied Chemistry, Los Acebos Building, Public University of Navarra, Campus of Arrosadia, E-31006, Pamplona, Spain
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Vasudevan M, Sakaria PL, Bhatt AS, Mody HM, Bajaj HC. Effect of Concentration of Aminopropyl Groups on the Surface of MCM-41 on Adsorption of Cu2+. Ind Eng Chem Res 2011. [DOI: 10.1021/ie201448q] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Manu Vasudevan
- Discipline of Inorganic Materials and Catalysis, Central Salt & Marine Chemicals Research Institute (CSIR-CSMCRI), Gijubhai Badheka Marg, Bhavnagar 364 021, Gujarat
| | - Praful L. Sakaria
- Discipline of Inorganic Materials and Catalysis, Central Salt & Marine Chemicals Research Institute (CSIR-CSMCRI), Gijubhai Badheka Marg, Bhavnagar 364 021, Gujarat
| | - Adarsh S. Bhatt
- Discipline of Inorganic Materials and Catalysis, Central Salt & Marine Chemicals Research Institute (CSIR-CSMCRI), Gijubhai Badheka Marg, Bhavnagar 364 021, Gujarat
| | - Haresh M. Mody
- Discipline of Inorganic Materials and Catalysis, Central Salt & Marine Chemicals Research Institute (CSIR-CSMCRI), Gijubhai Badheka Marg, Bhavnagar 364 021, Gujarat
| | - Hari C. Bajaj
- Discipline of Inorganic Materials and Catalysis, Central Salt & Marine Chemicals Research Institute (CSIR-CSMCRI), Gijubhai Badheka Marg, Bhavnagar 364 021, Gujarat
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Lu Z, Sun L, Nguyen K, Gao C, Yin Y. Formation mechanism and size control in one-pot synthesis of mercapto-silica colloidal spheres. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:3372-3380. [PMID: 21355589 DOI: 10.1021/la1048216] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Mercapto-silica spheres with controllable size from ∼150 nm to ∼3.5 μm and narrow size distribution have been prepared in water using a one-pot synthesis, in which 3-mercaptopropyltrimethoxysilane (MPS) was used as the sole silica source and ammonia as the base catalyst. The hydrolysis of MPS at the early stage of the reaction produces amphiphilic silicate species which initiate the self-emulsification of the system and lead to the formation of oil-in-water emulsion droplets. Further hydrolysis and condensation promote the nucleation and growth of the mercapto-silica spheres inside the emulsion droplets. These mercapto-silica spheres are both structurally and functionally different from typical silica particles prepared from silicon alkoxides. Understanding the formation mechanism allows systematic tuning of the size of mercapto-silica spheres in a wide range by changing the amount of precursor, the concentration of ammonia, the amount of additional surfactants, and the reaction time. We find that Ostwald ripening may occur quickly if the spheres are kept in the reaction solution, resulting in significant broadening of the particle size distribution. In order to obtain uniform and stable samples, it is important to quench the growth of the mercapto-silica spheres by separating them from the original reaction mixture and then storing them in solvents that can prevent further ripening.
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Affiliation(s)
- Zhenda Lu
- Department of Chemistry, University of California, Riverside, California 92521, USA
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Shinde PV, Shingate BB, Shingare MS. Aqueous Suspension of Basic Alumina: An Efficient Catalytic System for the Synthesis of Poly Functionalized Pyridines. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.2.459] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Application of unmodified microporous molecular sieves for the synthesis of poly functionalized pyridine derivatives in water. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcata.2011.01.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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V. M, Mody HM, Bajaj HC, Jasra RV. Adsorption of Cu2+ on Amino Functionalized Silica Gel with Different Loading. Ind Eng Chem Res 2009. [DOI: 10.1021/ie900273v] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Manu V.
- Discipline of Inorganic Materials and Catalysis, Central Salt & Marine Chemicals Research Institute (CSIR), Gijubhai Badheka Marg, Bhavnagar 364 002, Gujarat, India
| | - Haresh M. Mody
- Discipline of Inorganic Materials and Catalysis, Central Salt & Marine Chemicals Research Institute (CSIR), Gijubhai Badheka Marg, Bhavnagar 364 002, Gujarat, India
| | - Hari C. Bajaj
- Discipline of Inorganic Materials and Catalysis, Central Salt & Marine Chemicals Research Institute (CSIR), Gijubhai Badheka Marg, Bhavnagar 364 002, Gujarat, India
| | - Raksh V. Jasra
- Discipline of Inorganic Materials and Catalysis, Central Salt & Marine Chemicals Research Institute (CSIR), Gijubhai Badheka Marg, Bhavnagar 364 002, Gujarat, India
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Pérez-Quintanilla D, Sánchez A, del Hierro I, Fajardo M, Sierra I. Functionalized HMS mesoporous silica as solid phase extractant for Pb(II) prior to its determination by flame atomic absorption spectrometry. J Sep Sci 2007; 30:1556-67. [PMID: 17623437 DOI: 10.1002/jssc.200600540] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In this work, a mesoporous silica has been chemically modified with 5-mercapto-1-methyl-1-H-tetrazol using the homogeneous route (MTTZ-HMS). This synthetic route involved the reaction of 5-mercapto-1-methyl-1-H-tetrazol with 3-chloropropyltriethoxysilane, prior to immobilization on the support. The resulting material has been characterized and employed as solid phase extractant for Pb(II). The effect of several variables (stirring time, pH, temperature, metal concentration, presence of other metals) has been studied using batch and column techniques. In batch experiments, 15 min stirring time, 55 degrees C and pH 8 were the optimal conditions for Pb(II) adsorption. In column experiments, sorption was quantitative for 1000 mL of 2.41 x 10(-4 )mM of Pb(II) solution and adsorbed ions were eluted out by 5 mL of 1 M HCl (preconcentration factor of 200). Spiked tap water was used for the preconcentration and determination of Pb(II) by flame atomic absorption spectrometry, and a 100% recovery was obtained. The LOD and LOQ values of the proposed method were found to be 3.52 x 10(-3) and 4.20 x 10(-3 )mM, respectively. The RSD for three preconcentration experiments was found to be <or= 2%. The linear working range for measurements was between 2 x 10(-3 )and 0.14 mM (y = 0.0136x + 0.0007, R(2 )= 0.9999).
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Affiliation(s)
- Damián Pérez-Quintanilla
- Departamento de Química Inorgánica y Analítica, E.S.C.E.T, Universidad Rey Juan Carlos, C/ Tulipán s/n, Móstoles, Madrid, Spain
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Maria Claesson E, Philipse AP. Thiol-functionalized silica colloids, grains, and membranes for irreversible adsorption of metal(oxide) nanoparticles. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2006.10.019] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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da Fonseca MG, Almeida RK, Arakaki LN, Espinola JG, Airoldi C. Vermiculite as a useful host for guest cyclic aliphatic amine intercalation, followed by cation adsorption. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2006.01.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Thermodynamic properties of divalent cations complexed by ethylenesulfide immobilized on silica gel. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2005.12.041] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Claesson EM, Philipse AP. Monodisperse magnetizable composite silica spheres with tunable dipolar interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:9412-9. [PMID: 16207015 DOI: 10.1021/la051127a] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We demonstrate that magnetic particles of maghemite (gamma-Fe(2)O(3)) and cobalt ferrite (CoFe(2)O(4)) can be irreversibly attached to colloidal silica that is grafted with 3-mercaptopropyl(trimethoxy)silane (followed by the controlled growth of a silica layer) to obtain stable dispersions of monodisperse colloidal silica spheres that contain a dense shell of ferrite particles at an adjustable distance from the sphere surface. Magnetization of the ferrite shell induces a large dipole moment, and adjusting the thickness of the outer silica layer enables one to tune the contact attraction. This novel type of magnetizable silica colloid exhibits structure formation in a homogeneous field that varies from isotropic distributions to elongated dipolar chains.
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Affiliation(s)
- E M Claesson
- Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
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Lucho AMS, Pissetti FL, Gushikem Y. Al2O3-coated 3-N-propylpyridinium chloride silsesquioxane polymer film: preparation and electrochemical property study of adsorbed cobalt tetrasulfophthalocyanine. J Colloid Interface Sci 2004; 275:251-6. [PMID: 15158406 DOI: 10.1016/j.jcis.2004.02.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2003] [Accepted: 02/05/2004] [Indexed: 11/29/2022]
Abstract
Porous Al2O3 presenting a specific surface area of SBET = 105 m2 g(-1) was coated with 3-N-propylpyridinium chloride silsesquioxane polymer. The ion exchange capacity of this polymer grafted onto an Al2O3 surface, resulting in a material designated as AlSiPy(+)Cl-, was 1.09 mmol g(-1). Furthermore, a cobalt(II) tetrasulfophthalocyanine anionic complex was immobilized on the chemically modified surface by an ion exchange reaction with a yield of 40 micromol g(-1) (the surface density of the electroactive species is 3.80 x 10(-11) mol cm(-2)). The electrochemical properties of the material obtained, AlSiPy/CoTsPc, were tested for the catalytic oxidation of oxalic acid at 0.77 V vs SCE in 1.0 mol l(-1) KCl solution. Furthermore, a chronoamperometric technique was used with the electrode to test its potential use as a sensor for oxalic acid. The electrode response to oxalic acid concentrations between 1.0 and 3.5 mmol l(-1) was linear with an estimated detection limit of 0.5 mmol l(-1). The charge transfer resistance of the material, measured using the electrochemical impedance spectroscopy technique, was 43 Omega cm2.
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Affiliation(s)
- Alzira M S Lucho
- Instituto de Química, Unicamp, C.P. 6154, 13084-971 Campinas, Saõ Paulo, Brazil
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Machado RS, da Fonseca MG, Arakaki LN, Espinola JG, Oliveira SF. Silica gel containing sulfur, nitrogen and oxygen as adsorbent centers on surface for removing copper from aqueous/ethanolic solutions. Talanta 2004; 63:317-22. [DOI: 10.1016/j.talanta.2003.10.048] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2003] [Revised: 10/30/2003] [Accepted: 10/31/2003] [Indexed: 11/17/2022]
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