All Stories

  1. Removal of Kerosene from Wastewater: Current Trends and Emerging Perspectives for Environmental Remediation

    Article • Sustainability, December 2025, MDPI AG

    Dr Maria Harja

  2. Green CO2 Capture from Flue Gas Using Potassium Carbonate Solutions Promoted with Amino Acid Salts

    Article • Clean Technologies, November 2025, MDPI AG

    Dr Maria Harja

  3. Innovation in the Use of Recycled and Heat-Treated Glass in Various Applications: Mechanical and Chemical Properties

    Article • Coatings, May 2025, MDPI AG

    Dr Maria Harja

  4. Copper Ion Removal by Adsorption Using Fly Ash-Based Geopolymers: Process Optimization Insights from Taguchi and ANOVA Statistical Methods

    Article • Materials, August 2024, MDPI AG

    Dr Maria Harja

  5. Composite Materials with Glass Fiber Waste and Blast Furnace Slag

    Article • Journal of Composites Science, July 2024, MDPI AG

    Dr Maria Harja

  6. Thermal energy storage performance evaluation of bio-based phase change material/apricot kernel shell derived activated carbon in lightweight mortar

    Article • Journal of Energy Storage, December 2023, Elsevier

    Dr Maria Harja

  7. Applications of Recycled and Crushed Glass (RCG) as a Substitute for Natural Materials in Various Fields—A Review

    Article • Materials, August 2023, MDPI AG

    Dr Maria Harja

  8. Capitalization of tires waste as derived fuel for sustainable cement production

    Article • Sustainable Energy Technologies and Assessments, March 2023, Elsevier

    Dr Maria Harja

  9. Accumulation of Heavy Metal Ions from Urban Soil in Spontaneous Flora

    Article • Water, February 2023, MDPI AG

    Dr Maria Harja

  10. Intensification of the photodegradation efficiency of an emergent water pollutant through process conditions optimization by means of response surface methodology

    Article • Journal of Environmental Management, February 2023, Elsevier

    Dr Maria Harja

  11. Photocatalytic Removal of Antibiotics from Wastewater Using the CeO2/ZnO Heterojunction

    Article • Materials, January 2023, MDPI AG

    Dr Maria Harja

  12. STUDY OF MICROALGAE INFLUENCE ON CARBON CAPTURE FROM GASEOUS STREAMS WITHIN THE BIOTRICKLING FILTRATION PROCESS

    Article • November 2022, STEF92 Technology

    Dr Maria Harja

  13. Studies on the Removal of Congo Red Dye by an Adsorbent Based on Fly-Ash@Fe3O4 Mixture

    Article • Magnetochemistry, October 2022, MDPI AG

    Dr Maria Harja

  14. Development, characterization, and performance analysis of shape‐stabilized phase change material included‐geopolymer for passive thermal management of buildings

    Article • International Journal of Energy Research, September 2022, Wiley

    Dr Maria Harja

  15. Development and Characterization of a Novel Soil Amendment Based on Biomass Fly Ash Encapsulated in Calcium Alginate Microspheres

    Article • International Journal of Molecular Sciences, September 2022, MDPI AG

    Dr Maria Harja

  16. Enhancing the TiO2-Ag Photocatalytic Efficiency by Acetone in the Dye Removal from Wastewater

    Article • Water, August 2022, MDPI AG

    Dr Maria Harja, Professor PhD Gabriela Ciobanu

  17. Biosorption Potential of Microbial and Residual Biomass of Saccharomyces pastorianus Immobilized in Calcium Alginate Matrix for Pharmaceuticals Removal from Aqueous Solutions

    Article • Polymers, July 2022, MDPI AG

    Dr Maria Harja

  18. Biosorptive Removal of Ethacridine Lactate from Aqueous Solutions by Saccharomyces pastorianus Residual Biomass/Calcium Alginate Composite Beads: Fixed-Bed Column Study

    Article • Materials, July 2022, MDPI AG

    Dr Maria Harja

  19. Recent advances in removal of Congo Red dye by adsorption using an industrial waste

    Article • Scientific Reports, April 2022, Springer Science + Business Media

    Dr Maria Harja

  20. Excellent ambient oxidation and mineralization of an emerging water pollutant using Pd-doped TiO 2 photocatalyst and UV-A irradiation

    Article • March 2022, Cellule MathDoc/CEDRAM

    Dr Maria Harja

  21. Production and characterization of natural clay-free green building brick materials using water treatment sludge and oak wood ash

    Article • Archives of Civil and Mechanical Engineering, February 2022, Springer Science + Business Media

    Dr Maria Harja

  22. Using Fly Ash Wastes for the Development of New Building Materials with Improved Compressive Strength

    Article • Materials, January 2022, MDPI AG

    Dr Maria Harja

  23. Encapsulation of Saccharomyces pastorianus Residual Biomass in Calcium Alginate Matrix with Insights in Ethacridine Lactate Biosorption

    Article • Polymers, January 2022, MDPI AG

    Dr Maria Harja

  24. Removal of Toxic Copper Ion from Aqueous Media by Adsorption on Fly Ash-Derived Zeolites: Kinetic and Equilibrium Studies

    Article • Polymers, October 2021, MDPI AG

    Dr Maria Harja

  25. New construction materials synthesized from water treatment sludge and fired clay brick wastes

    Article • Journal of Building Engineering, October 2021, Elsevier

    Dr Maria Harja

  26. Application of Saccharomyces cerevisiae/Calcium Alginate Composite Beads for Cephalexin Antibiotic Biosorption from Aqueous Solutions

    Article • Materials, August 2021, MDPI AG

    Dr Maria Harja

  27. Performance assessment of five adsorbents based on fly ash for removal of cadmium ions

    Article • Journal of Molecular Liquids, July 2021, Elsevier

    Professor PhD Gabriela Ciobanu, Dr Maria Harja

  28. ASYMMETRIC CELLULOSE ACETATE MEMBRANES USED IN SEPARATION APPLICATIONS

    Article • Journal of Applied Life Sciences and Environment, May 2021, University of Agricultural Sciences and Veterinary Medicine in Iasi

    Dr Maria Harja

  29. FLY ASH MAGNETIC ADSORBENT FOR CADMIUM ION REMOVAL FROM AN AQUEOUS SOLUTION

    Article • Journal of Applied Life Sciences and Environment, March 2021, University of Agricultural Sciences and Veterinary Medicine in Iasi

    Dr Maria Harja

  30. Adsorption Performance of Modified Fly Ash for Copper Ion Removal from Aqueous Solution

    Article • Water, January 2021, MDPI AG

    Professor PhD Gabriela Ciobanu, Dr Maria Harja

  31. Magnetic Solid-Phase Extraction of Cadmium Ions by Hybrid Self-Assembled Multicore Type Nanobeads

    Article • Polymers, January 2021, MDPI AG

    Dr Maria Harja

  32. TiO2/Fly Ash Nanocomposite for Photodegradation of Organic Pollutant

    Article • January 2021, Springer Science + Business Media

    Dr Maria Harja

  33. Eco-friendly Nano-adsorbents for Pollutant Removal from Wastewaters

    Article • January 2021, Springer Science + Business Media

    Dr Maria Harja

  34. Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater

    Article • Materials, December 2020, MDPI AG

    Dr Maria Harja, Professor PhD Gabriela Ciobanu

  35. TiO2 Doped with Noble Metals as an Efficient Solution for the Photodegradation of Hazardous Organic Water Pollutants at Ambient Conditions

    Article • Water, December 2020, MDPI AG

    Dr Maria Harja, Professor PhD Gabriela Ciobanu

  36. In-situ filler loading vs. conventional filler

    Article • Materials, November 2020, MDPI AG

    Dr Maria Harja

  37. Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies

    Article • Materials, October 2020, MDPI AG

    Dr Maria Harja

  38. Viscosity of potassium carbonate solutions promoted by new amines

    Article • Journal of Engineering Sciences and Innovation, September 2020, Academia de Stiinte Tehnice in Romania

    Dr Maria Harja

  39. Eco-Friendly Materials Obtained by Fly Ash Sulphuric Activation for Cadmium Ions Removal

    Article • Materials, August 2020, MDPI AG

    Dr Maria Harja, Professor PhD Gabriela Ciobanu

  40. Doping Titanium Dioxide with Palladiun for Enhancing thePhotocatalytic Decontamination and Mineralization of a Refractory Water Pollutant

    Article • Revista de Chimie, August 2020, Revista de Chimie SRL

    Dr Maria Harja

  41. Eco-friendly Nano-adsorbents for Pollutant Removal from Wastewaters

    Article • January 2020, Springer Science + Business Media

    Dr Maria Harja

  42. TiO2/Fly Ash Nanocomposite for Photodegradation of Organic Pollutant

    Article • January 2020, Springer Science + Business Media

    Dr Maria Harja

  43. Analcime-bearing rocks as advanced sorbents

    Article • Epitoanyag-Journal of Silicate Based and Composite Materials, January 2020, SZTE Hungarian Scientific Society of the Silicate Industry

    Dr Maria Harja

  44. TiO2/Fly Ash Nanocomposite for Photodegradation of Organic Pollutant

    Article • January 2020, Springer Science + Business Media

    Dr Maria Harja

  45. Bismuth-Doped Nanohydroxyapatite Coatings on Titanium Implants for Improved Radiopacity and Antimicrobial Activity

    Article • Nanomaterials, November 2019, MDPI AG

    Dr Maria Harja, Professor PhD Gabriela Ciobanu

  46. Biogeosorbents for solving ecological problems

    Article • IOP Conference Series Materials Science and Engineering, October 2019, Institute of Physics Publishing

    Dr Maria Harja

  47. Preparation and Properties of Ceramic Materials from Coal Fly Ash

    Article • April 2019, Springer Science + Business Media

    Dr Maria Harja

  48. New Approaches in Modeling and Simulation of CO2 Absorption Reactor by Activated Potassium Carbonate Solution

    Article • Processes, February 2019, MDPI AG

    Dr Maria Harja, Professor PhD Gabriela Ciobanu

  49. Clay- and zeolite-based biogeosorbents: modelling and properties

    Article • Epitoanyag-Journal of Silicate Based and Composite Materials, January 2019, SZTE Hungarian Scientific Society of the Silicate Industry

    Dr Maria Harja

  50. Efficiency Evaluation for Titanium Dioxide-Based Advanced Materials in Water Treatment

    Article • January 2019, Springer Science + Business Media

    Dr Maria Harja

  51. NEW TiO2-Ag NANOPARTICLES USED FOR ORGANIC COMPOUNDS DEGRADATION

    Article • Environmental Engineering and Management Journal, January 2019, OAIMDD - EcoZone Publishing House

    Dr Maria Harja

  52. Investigation on hydroxyapatite coatings formation on titanium surface

    Article • IOP Conference Series Materials Science and Engineering, November 2018, Institute of Physics Publishing

    Dr Maria Harja

  53. Synthesis and characterisation of a binder cement replacement based on alkali activation of fly ash waste

    Article • Process Safety and Environmental Protection, October 2018, Elsevier

    Dr Maria Harja

  54. SYNTHESIS OF ZnO/CuO NANOCOMPOSITES WITH CNF AND Ag BY GEL SOL

    Article • September 2018, National Research and Development Institute for Industrial Ecology IND-ECOIND

    Catalina Nutescu Duduman, Dr Maria Harja

  55. Studies on adsorption of oxytetracycline from aqueous solutions onto hydroxyapatite

    Article • The Science of The Total Environment, July 2018, Elsevier

    Dr Maria Harja, Professor PhD Gabriela Ciobanu

  56. Cerium-doped hydroxyapatite/collagen coatings on titanium for bone implants

    Article • Ceramics International, July 2018, Elsevier

    Dr Maria Harja, Professor PhD Gabriela Ciobanu

  57. PREPARATION AND CHARACTERIZATION OF NANOCOMPOSITE MATERIAL BASED ON TiO2-Ag FOR ENVIRONMENTAL APPLICATIONS

    Article • Environmental Engineering and Management Journal, January 2018, OAIMDD - EcoZone Publishing House

    Catalina Nutescu Duduman, Dr Maria Harja

  58. EFFECTIVENESS FACTOR APPROACH FOR CHEMICAL ABSORPTION PROCESS

    Article • Environmental Engineering and Management Journal, January 2018, OAIMDD - EcoZone Publishing House

    Dr Maria Harja

  59. NEW ADSORBENT MATERIALS ON THE BASE OF ASH AND LIME FOR LEAD REMOVAL

    Article • September 2017, National Research and Development Institute for Industrial Ecology IND-ECOIND

    Dr Maria Harja

  60. Power plant wastes capitalization as geopolymeric building materials

    Article • E3S Web of Conferences, January 2017, EDP Sciences

    Dr Maria Harja, Professor PhD Gabriela Ciobanu

  61. Removal of oxytetracycline from aqueous solutions by hydroxyapatite as a low-cost adsorbent

    Article • E3S Web of Conferences, January 2017, EDP Sciences

    Professor PhD Gabriela Ciobanu, Dr Maria Harja

  62. ASSESSMENT OF GROUNDWATER AND SURFACE WATER CONTAMINATION BY LANDFILL LEACHATE: A CASE STUDY IN NEAMT COUNTY, ROMANIA

    Article • Environmental Engineering and Management Journal, January 2017, OAIMDD - EcoZone Publishing House

    Dr Maria Harja

  63. New trends in the mechanisms of increasing productivity of mineral-based materials

    Article • Vestnik of Institute of Geology of Komi Science Center of Ural Branch RAS, January 2017, IG Komi SC UB RAS

    Dr Maria Harja

  64. Influence of Tire Waste over Durability of Polymer Concrete

    Article • December 2016, Institute of Research Engineers and Doctors, LLC

    Dr Maria Harja

  65. Retention of barium and europium radionuclides from aqueous solutions on ash-based sorbents by application of radiochemical techniques

    Article • Applied Radiation and Isotopes, October 2016, Elsevier

    Dr Maria Harja

  66. Synthesis of Zeolite from Fly Ash and their Use as Soil Amendment

    Article • August 2016, IntechOpen

    Dr Maria Harja

  67. Kinetic and equilibrium studies on adsorption of Reactive Blue 19 dye from aqueous solutions by nanohydroxyapatite adsorbent

    Article • Archives of Environmental Protection, January 2016, De Gruyter

    Professor PhD Gabriela Ciobanu, Dr Maria Harja

  68. Removal of Zn(II) ions from aqueous media on thermal activated sawdust

    Article • Desalination and Water Treatment, December 2015, Taylor & Francis

    Dr Laura Bulgariu, Dr Maria Harja

  69. Retention of cesium from aqueous solutions using synthetic zeolites produced from power plant ash

    Article • Journal of Radioanalytical and Nuclear Chemistry, November 2015, Springer Science + Business Media

    Dr Maria Harja

  70. Use of the Information Concerning the Products Manufacturing in Innovative Learning and Education Programme for Health Care Sector

    Article • Applied Mechanics and Materials, November 2015, Trans Tech Publications

    Dr Maria Harja, Professor PhD Gabriela Ciobanu

  71. Structure and Strength of Flocs of Precipitated Calcium Carbonate Induced by Various Polymers Used in Papermaking

    Article • Industrial & Engineering Chemistry Research, June 2015, American Chemical Society (ACS)

    Dr Maria Harja

  72. Removal of cadmium(II) from aqueous solution by adsorption onto modified algae and ash

    Article • Korean Journal of Chemical Engineering, May 2015, Springer Science + Business Media

    Dr Laura Bulgariu, Professor PhD Gabriela Ciobanu, Dr Maria Harja

  73. A NEW STRATEGY FOR PENTACHLOROPHENOL MONITORING IN WATER SAMPLES USING ULTRA-HIGH PERFORMANCE LIQUID CHROMATOGRAPHY - MASS SPECTROMETRY TANDEM

    Article • Environmental Engineering and Management Journal, January 2015, OAIMDD - EcoZone Publishing House

    Dr Maria Harja

  74. New materials synthesized from ash under moderate conditions for removal of toxic and radioactive metals

    Article • Journal of Radioanalytical and Nuclear Chemistry, November 2014, Springer Science + Business Media

    Dr Maria Harja

  75. An Overview on Assistive Technology Training Courses for Salespersons

    Article • Applied Mechanics and Materials, October 2014, Trans Tech Publications

    Professor PhD Gabriela Ciobanu, Dr Maria Harja

  76. A low-cost sorbent for removal of copper ions from wastewaters based on sawdust/fly ash mixture

    Article • International Journal of Environmental Science and Technology, June 2014, Springer Science + Business Media

    Dr Maria Harja

  77. Acid Black 172 dye adsorption from aqueous solution by hydroxyapatite as low-cost adsorbent

    Article • Korean Journal of Chemical Engineering, March 2014, Springer Science + Business Media

    Professor PhD Gabriela Ciobanu, Dr Maria Harja

  78. Removal of Astrazone Blue from aqueous solutions onto brown peat. Equilibrium and kinetics studies

    Article • Korean Journal of Chemical Engineering, March 2014, Springer Science + Business Media

    Professor PhD Gabriela Ciobanu, Dr Maria Harja

  79. Neuro-evolutionary optimization methodology applied to the synthesis process of ash based adsorbents

    Article • Journal of Industrial and Engineering Chemistry, March 2014, Elsevier

    Dr Maria Harja

  80. Uranium removal from aqueous solutions by raw and modified thermal power plant ash

    Article • Journal of Radioanalytical and Nuclear Chemistry, November 2013, Springer Science + Business Media

    Dr Maria Harja

  81. Prediction of properties of polymer concrete composite with tire rubber using neural networks

    Article • Materials Science and Engineering B, November 2013, Elsevier

    Dr Maria Harja

  82. Obtaining and Utilizing Cellulose Fibers with in-Situ Loading as an Additive for Printing Paper

    Article • Materials, October 2013, MDPI AG

    Dr Maria Harja

  83. Removal of Reactive Blue 204 Dye from Aqueous Solutions by Adsorption Onto Nanohydroxyapatite

    Article • Science of Advanced Materials, August 2013, American Scientific Publishers

    Professor PhD Gabriela Ciobanu, Dr Maria Harja

  84. Behaviour of short polymer-high strength concrete columns under eccentric compression

    Article • Archives of Civil and Mechanical Engineering, March 2013, Elsevier

    Dr Maria Harja, Ionut-Ovidiu Toma

  85. Influence of Different Additions on Frost-Thaw and Chemical Resistance of Polymer Concrete

    Article • Advanced Science Letters, February 2013, American Scientific Publishers

    Dr Maria Harja

  86. Removal of heavy metal ions from aqueous solutions using low-cost sorbents obtained from ash

    Article • Chemical Papers, January 2013, Springer Science + Business Media

    Dr Maria Harja

  87. Low cost adsorbents obtained from ash for copper removal

    Article • Korean Journal of Chemical Engineering, July 2012, Springer Science + Business Media

    Dr Maria Harja

  88. Using Neural Networks for Prediction of Properties of Polymer Concrete with Fly Ash

    Article • Journal of Materials in Civil Engineering, May 2012, American Society of Civil Engineers (ASCE)

    Dr Maria Harja

  89. HOMOGENEOUS AREAS DELIMITATION BY CONSIDERING THE ENERGY DEMAND FOR PLANTS GROWING IN COVERED SPACES

    Article • Environmental Engineering and Management Journal, January 2012, OAIMDD - EcoZone Publishing House

    Dr Maria Harja

  90. IMPROVING SOIL QUALITY BY ADDING MODIFIED ASH

    Article • Environmental Engineering and Management Journal, January 2012, OAIMDD - EcoZone Publishing House

    Dr Maria Harja

  91. SIMULTANEOUS REMOVAL OF ASTRAZONE BLUE AND LEAD ONTO LOW COST ADSORBENTS BASED ON POWER PLANT ASH

    Article • Environmental Engineering and Management Journal, January 2011, OAIMDD - EcoZone Publishing House

    Dr Maria Harja

  92. Comparison of Mechanical Properties for Polymer Concrete with Different Types of Filler

    Article • Journal of Materials in Civil Engineering, July 2010, American Society of Civil Engineers (ASCE)

    Dr Maria Harja

  93. CaCO3 CONTROLLABLE SYNTHESIS BY DOUBLE EXCHANGE METHOD USING CaCl2 RESIDUAL SOLUTIONS

    Article • Environmental Engineering and Management Journal, January 2010, OAIMDD - EcoZone Publishing House

    Dr Maria Harja

  94. Obtaining and Characterization of the Polymer Concrete with Fly Ash

    Article • Journal of Applied Sciences, January 2009, Science Alert

    Dr Maria Harja

  95. STUDY OF MORPHOLOGY FOR GEOPOLYMER MATERIALS OBTAINED FROM FLY ASH

    Article • Environmental Engineering and Management Journal, January 2009, OAIMDD - EcoZone Publishing House

    Dr Maria Harja

  96. UTILIZATION OF COAL FLY ASH FROM POWER PLANTS

    Article • Environmental Engineering and Management Journal, January 2009, OAIMDD - EcoZone Publishing House

    Dr Maria Harja

  97. WASTES USED IN OBTAINING POLYMER COMPOSITE

    Article • Environmental Engineering and Management Journal, January 2009, OAIMDD - EcoZone Publishing House

    Dr Maria Harja

  98. UTILIZATION OF COAL FLY ASH FROM POWER PLANTS - I. ASH CHARACTERIZATION

    Article • Environmental Engineering and Management Journal, January 2008, OAIMDD - EcoZone Publishing House

    Dr Maria Harja