Wastewater treatment Solar photo-catalyst development Algae photo-bioreactors development Photo-catalytic reactors design, Biofilteration, VOC biodegradation Bioreactor design, modeling, and scale up: slurry airlift bioreactors, slurry bubble columns, stirred fermenters. Chemical & biochemical reaction engineering Heterogeneous and homogeneous catalysis

Al Ketife, A., S. Judd, and H. Znad. 2016.“A mathematical model for carbon fixation and nutrient removal by an algal photobioreactor.”Chemical Engineering Science 153: 354-362. Al Haddabi, M., A. Mushtaque, Z. Al.Jebri, H. B. Vuthaluru, H. Znad, and M. Al.Kindi. 2016.“Boron removal from seawater using date palm (Phoenix dactylifera) seed ash.”Desalination and Water Treatment 57: 5130-5137. Al Ketife, A., M. Judd, and H. Znad. 2016.“Synergistic effects and optimization of nitrogen and phosphorus concentrations on the growth and nutrient uptake of a freshwater Chlorella vulgaris.”Environmental Technology -. In press. Al Ketife, A., S. Judd, and H. Znad. 2016.“Optimization of cultivation conditions for combined nutrient removal and CO2 fixation in a batch photobioreactor.”Journal of Chemical Technology and Biotechnology -. In press. Ismail, ., and H. Znad. 2015. “Biosorption of Heavy Metals and Nutrients: A Green Approach for Clean-Up of Contaminated Water.” In Physical Chemical and Biological Treatment Processes for Water and Wastewater, 113-129. USA: Nova Science Publishers. Al.Haddabi, M., H. B. Vuthaluru, M. Ahmed, and H. Znad. 2015. “Use of Ceramic Membrane Technology for Sustainable Management of Oil Production Water: A Review.” In Recent Progress in Desalination, Environmental and Marine Outfall Systems, 11-23. Switzerland: Springer International Publishing. Awual, M., M. Awual, H. Md. Munjur, H. Md. Munjur, and H. Znad. 2015.“Organic-inorganic based nano-conjugate adsorbent for selective palladium(II) detection, separation and recovery.”Chemical Engineering Journal 259: 611-619. Haddabi, ., . Al. Haddabi, H. B. Vuthaluru, H. Znad, M. Ahmed, and M. Ahmed. 2015.“Attapulgite as Potential Adsorbent for Dissolved Organic Carbon from Oily Produced water.”Clean - Soil, Air, Water 43 (11): 1522-1530. Abeish, A., H. Ang, and H. Znad. 2015.“Solar photocatalytic degradation of 4-chlorophenol: mechanism and kinetic modelling.”Desalination and Water Treatment 53: 2915-2923. Abeish, A., H. Ang, and H. Znad. 2015.“Solar photocatalytic degradation of chlorophenols mixture (4-CP and 2,4-DCP): Mechanism and kinetic modelling.”J Environ Sci Health A Tox Hazard Subst Environ Eng 50: 125-134. Awual, A., M. Abdul Khaleque, Y. Ratna, and H. Znad. 2015.“Simultaneous ultra-trace palladium(II) detection and recovery from wastewater using new class meso-adsorbent.”Journal of Industrial and Engineering Chemistry 21: 405-413. Judd, S., S. Judd, L. van den Broeke, L. van den Broeke, M. Shurair, M. Shurair, Y. Kuti, Y. Kuti, and H. Znad. 2015.“Algal remediation of CO2 and nutrient discharges: a review.”Water Research 87: 356-366. Abeish, A., H. Ang, and H. Znad. 2015.“Role of ferric and ferrous ions in the enhancement of the heterogeneous solar photo-catalytic degradation of chlorophenols combined mixture.”Water Science and Technology 72 (9): 1561-1568. Al.Haddabi, M., M. Al.Haddabi, H. B. Vuthaluru, H. Znad, M. Ahmed, and M. Ahmed. 2015.“Removal of Dissolved Organic Carbon from Oily Produced Water by Adsorption onto Date Seeds: Equilibrium, Kinetic, and Thermodynamic Studies.”Water, Air, & Soil Pollution 226. Znad, H., and Z. Frangeskides. 2014.“Chicken drumstick bones as an efficient biosorbent for copper (II) removal from aqueous solution.”Desalination and Water Treatment 52: 1560-1570. Abeish, A., H. Ang, and H. Znad. 2014.“Enhanced Solar-Photocatalytic Degradation of Combined Chlorophenols Using Ferric Ions and Hydrogen Peroxide.”Industrial & Engineering Chemistry Research 53: 10583-10589. Znad, H., H. Ang, and M. O. Tade. 2012.“Ta/TiO2-and Nb/TiO2-Mixed Oxides as Efficient Solar Photocatalysts: Preparation, Characterization, and Photocatalytic Activity.”International Journal of Photoenergy 2012: 548158-1-548158-9. Salehi, Z., F. Vahabzadeh, M. Sohrabi, S. Fatemi, and H. Znad. 2010.“Statistical medium optimization and biodegradative capacity of Ralstonia eutropha toward p-nitrophenol.”Biodegradation 21 (4): 645-657. Znad, H., H. Ohata, and M. O. Tade. 2010.“A Net Draft Tube Slurry Airlift Bioreactor for 2,4-D (2,4-Dichlorophenoxyacetic Acid) Pesticide Biodegradation.”Canadian Journal of Chemical Engineering 88 (4): 565-573. Znad, H., M. O. Tade, and H. Ang. 2010.“Influence of doping Ta and Nb metals on the solar photocatalytic activity of S-doped TiO2.” In 19th International Congress of Chemical and Process Engineering (CHISA 2010) and the 7th European Congress of Chemical Engineering (ECCE-7), Aug 28, 2010, Praha, Czech Republic: Process Engineering Publisher, Ing. Jan Novosad.