OOIR: Observatory of International Research

Papers

(The H4-Index of Environmental Progress & Sustainable Energy is 25. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2022-08-01 to 2026-08-01.)

Article	Citations
Issue Information ‐ Info for Authors	132
Bioclogging effects on mass transport using volume averaging method in bioretention cell treating wastewater: Theories	104
Resources for renewable natural gas: A Hawaii case study	67
Effect of substituting water source on the methane production from lignocellulosic biowaste during anaerobic digestion	55
A comprehensive review of coffee waste based adsorbents for the sequestration of different water contaminants	54
A bibliometric review on green hydrogen as an alternative for combined generation systems	48
Pedestrians' perceptions of different heat mitigation strategies for an urban river valley in Iran: Coupling a questionnaire survey with microclimate modeling	43
Experimental investigation of pyramid solar still performance enhanced by natural and volcanic pebbles‐based thermal storage	41
Effect of calcium hydroxide on the characteristics of volatile organic compounds emission during sewage sludge incineration	36
Photoactivation of nano MgO anchored g‐C₃N₄ enhances biodiesel production in Chlorella sorokiniana: A sustainable approach	34
A critical review on carbon materials from oil sludges: Activation, application and future prospects	34
Response surface methodology for optimizing the pulsed spray deposition of Co‐doped Bi₂O₃ photocatalytic thin films	33
Flame and flow structure of premixed hydrogen/air combustion under different inlet flow rates	32
Experimental research on transforming different functional thresholds to improve double slope solar still productivity	32
Sustainable thermal energy storage in a cylindrical solar pond with calcium chloride stratification	31
Nifedipine and metronidazole photodegradation using sustainable Raphanus sativus leaf extract mediated zirconia nanoparticles: A novel green solution for	30
Preparation of carbon dioxide‐adsorbing materials from fly ash‐modified steel slag and their performance optimization	30
Production and characterization of composite activated carbon from potato peel waste for cyanide removal from aqueous solution	29
Cultivation of aerobic granular biomass in continuous flow‐intermittent decant type reactor fed with anaerobic effluent	29
MCDM approaches in BIM ‐driven decision‐making models in enhancing energy efficiency for sustainable	27
Design and fast uptake of fluoride using hybrid biopolymers encapsulated magnetic hydroxyapatite beads	26
Recent advancement in the application of metal based nanoadditive in diesel/biodiesel fueled compression ignition engine: A comprehensive review on nanofluid preparation and stability, fuel property,	26
Comprehensive environmental and economic analysis of active‐mode greenhouse solar dryers for green peas processing	26
Environmental‐economic analysis of CCUS in a mature carbonate reservoir for oilfield decarbonization	25
The effect of surfactant on biosolubilization of weathered coal	25

A comprehensive review of nano clay: From development and applications to research opportunities	25
Activation of persulfate by iron‐loaded soybean straw biochar for efficient degradation of dye contaminants: Synthesis, performance, and mechanism	25