Verified email at gmail.com
Senior Assistant Professor, Petroleum and Chemical Engineering,
Universiti Teknologi Brunei
Dr. Rao who is presently working as Faculty in Petroleum and Chemical Engineering, Universiti Teknologi Brunei. He has worked as Post-Doctoral research fellow at National University of Singapore for six years. He has over 18 years of working experience in Academics, Industry, and Research. He has experience of working in multidisciplinary fields and has expertise in various evolutionary optimization techniques and process modeling. He has published more than 60 research articles in reputed journals and conference proceedings with a combined Impact factor of 116 and has an h-index of 15 in Scopus & 16 in Google Scholar). He has 9 book chapters published in Elsevier and Springer journals. Received Publons Peer Reviewer Award for Environment & Ecology and Crossfield categories for the year 2019, which states that I was in the top 1% of global peer reviewers
Professional activities:
Editor-in-Chief, International Journal of Chemoinformatics and Chemical Engineering (IJCCE), IGI Global, USA.
Guest editor for Spl. Issue: “Nanocomposites for the Sustainable Environment”, in Applied Sciences Journal (IF: 2.21), MDPI
Editorial board Member: SN Applied Sciences (Springer Nature): Air, Soil, and Water Research(SAGE): Green Processing and Synthesis (IF: 0.736, DeGruyter)
Peer-review member in more than 55 reputed journals from Elsevier (12), Springer (10), Taylor & Francis (4), Scientific Reports and other reputed journals (20).
Post-Doc at National University of Singapore
PhD in Chemical Engineering from Indian Institute of Technology (IIT) Delhi
M.Tech from IIT Kanpur, India
B. Tech from Andhra University College of Engineering, Visakhapatnam.
Process modeling and simulation; Multi-objective optimization; machine learning; Nanomaterials; Wastewater treatment; nanocomposite; sustainable water purification; Material Synthesis
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Mohammad Hadi Dehghani, Amir Hessam Hassani, Rama Rao Karri, Bahareh Younesi, Mansoureh Shayeghi, Mehdi Salari, Ahmad Zarei, Mahmood Yousefi, and Zoha Heidarinejad
Scientific Reports, eISSN: 20452322, Published: December 2021
Springer Science and Business Media LLC
AbstractIn the present study, the adsorptive removal of organophosphate diazinon pesticide using porous pumice adsorbent was experimentally investigated in a batch system, modelled and optimized upon response surface methodology (RSM) and artificial neural network-genetic algorithm (ANN-GA), fitted to isotherm, kinetic and thermodynamic models. The quantification of adsorbent elements was determined using EDX. XRD analysis was utilized to study the crystalline properties of adsorbent. The FT-IR spectra were taken from adsorbent before and after adsorption to study the presence and changes in functional groups. The constituted composition of the adsorbent was determined by XRF. Also, the ionic strength and adsorbent reusability were explored. The influences of operational parameters like pH, initial pesticide concentration, adsorbent dosage and contact time were investigated systematically. ANN-GA and RSM techniques were used to identify the optimal process variables that result in the highest removal. Based on the RSM approach, the optimization conditions for maximum removal efficiency is obtained at pH = 3, adsorbent dosage = 4 g/L, contact time = 30 min, and initial pesticide concentration = 6.2 mg/L. To accurately identify the parameters of nonlinear isotherm and kinetic models, a hybrid evolutionary differential evolution optimization (DEO) is applied. Results indicated that the equilibrium adsorption data were best fitted with Langmuir and Temkin isotherms and kinetic data were well described by pseudo-first and second-order kinetic models. The thermodynamic parameters such as entropy, enthalpy and Gibbs energy were evaluated to study the effect of temperature on pesticide adsorption.
Mohammad Hadi Dehghani, Mehdi Salari, Rama Rao Karri, Farshad Hamidi, and Roghayeh Bahadori
Scientific Reports, eISSN: 20452322, Published: December 2021
Springer Science and Business Media LLC
AbstractIn the present study, reactive red 198 (RR198) dye removal from aqueous solutions by adsorption using municipal solid waste (MSW) compost ash was investigated in batch mode. SEM, XRF, XRD, and BET/BJH analyses were used to characterize MSW compost ash. CNHS and organic matter content analyses showed a low percentage of carbon and organic matter to be incorporated in MSW compost ash. The design of adsorption experiments was performed by Box–Behnken design (BBD), and process variables were modeled and optimized using Box–Behnken design-response surface methodology (BBD-RSM) and genetic algorithm-artificial neural network (GA-ANN). BBD-RSM approach disclosed that a quadratic polynomial model fitted well to the experimental data (F-value = 94.596 and R2 = 0.9436), and ANN suggested a three-layer model with test-R2 = 0.9832, the structure of 4-8-1, and learning algorithm type of Levenberg–Marquardt backpropagation. The same optimization results were suggested by BBD-RSM and GA-ANN approaches so that the optimum conditions for RR198 absorption was observed at pH = 3, operating time = 80 min, RR198 = 20 mg L−1 and MSW compost ash dosage = 2 g L−1. The adsorption behavior was appropriately described by Freundlich isotherm, pseudo-second-order kinetic model. Further, the data were found to be better described with the nonlinear when compared to the linear form of these equations. Also, the thermodynamic study revealed the spontaneous and exothermic nature of the adsorption process. In relation to the reuse, a 12.1% reduction in the adsorption efficiency was seen after five successive cycles. The present study showed that MSW compost ash as an economical, reusable, and efficient adsorbent would be desirable for application in the adsorption process to dye wastewater treatment, and both BBD-RSM and GA-ANN approaches are highly potential methods in adsorption modeling and optimization study of the adsorption process. The present work also provides preliminary information, which is helpful for developing the adsorption process on an industrial scale.
Fahad Saleem Ahmed Khan, N. M. Mubarak, Mohammad Khalid, Rashmi Walvekar, E. C. Abdullah, Awais Ahmad, Rama Rao Karri, and Harshini Pakalapati
Scientific Reports, eISSN: 20452322, Published: December 2021
Springer Science and Business Media LLC
AbstractModified multi-walled carbon nanotubes (f-MWCNTs) and hydroxyapatite nanorods (n-HA) were reinforced into polypropylene (PP) with the support of a melt compounding approach. Varying composition of f-MWCNTs (0.1–0.3 wt.%) and nHA (15–20 wt.%) were reinforced into PP, to obtain biocomposites of different compositions. The morphology, thermal and mechanical characteristics of PP/n-HA/f-MWCNTs were observed. Tensile studies reflected that the addition of f-MWCNTs is advantageous in improving the tensile strength of PP/n-HA nanocomposites but decreases its Young’s modulus significantly. Based on the thermal study, the f-MWCNTs and n-HA were known to be adequate to enhance PP’s thermal and dimensional stability. Furthermore, MTT studies proved that PP/n-HA/f-MWCNTs are biocompatible. Consequently, f-MWCNTs and n-HA reinforced into PP may be a promising nanocomposite in orthopedics industry applications such as the human subchondral bone i.e. patella and cartilage and fabricating certain light-loaded implants.
Samira Karimi, Rama Rao Karri, Mohammad Tavakkoli Yaraki, and Janardhan Reddy Koduru
Environmental Chemistry Letters, ISSN: 16103653, eISSN: 16103661, Pages: 2873-2890, Published: August 2021
Springer Science and Business Media LLC
Bioethanol produced from biological resources is considered as an alternative, renewable, and sustainable energy source in the context of the circular economy. Moreover, bioethanol is a biofuel that has similar energy content to gasoline, but emits less toxic pollutants compared to fossil fuels. Yet bioethanol must be anhydrous to be mixed with regular gasoline and is then utilized as a vehicle fuel. Different techniques have been developed to obtain anhydrous ethanol. Here, we compare techniques for dehydration of bioethanol, including adsorption and distillation. We present the performance of the process, product recovery, and energy consumption of the pressure swing adsorption method, which is effective and widely used.
Karchiyappan Thirugnanasambandham and Rama Rao Karri
Environmental Technology and Innovation, eISSN: 23521864, Published: August 2021
Elsevier BV
Fahad Saleem Ahmed Khan, Nabisab Mujawar Mubarak, Yie Hua Tan, Mohammad Khalid, Rama Rao Karri, Rashmi Walvekar, Ezzat Chan Abdullah, Sabzoi Nizamuddin, and Shaukat Ali Mazari
Journal of Hazardous Materials, ISSN: 03043894, eISSN: 18733336, Volume: 413, Published: 5 July 2021
Elsevier BV
J.N. Sahu, Rama Rao Karri, and N.S. Jayakumar
Industrial Crops and Products, ISSN: 09266690, Volume: 164, Published: June 2021
Elsevier BV
Bashir Busahmin, Rama Rao Karri, Stephen Tyson, and Morteza Jami
Petroleum, ISSN: 24056561, eISSN: 24055816, Pages: 188-198, Published: June 2021
Elsevier BV
Mohammad Hadi Dehghani, Solmaz Gholami, Rama Rao Karri, Eder C. Lima, Amir Hossein Mahvi, Shahrokh Nazmara, and Mehdi Fazlzadeh
Journal of Environmental Management, ISSN: 03014797, eISSN: 10958630, Volume: 286, Published: 15 May 2021
Elsevier BV
In this study, fluoride removal from polluted potable water using magnetic carbon-based adsorbents derived from agricultural biomass was thoroughly investigated. An experimental matrix is designed considering the interactive effects of independent process variables (pH, adsorbent dose, contact time, and initial fluoride concentration) on the removal efficiency. Isotherms and kinetics studies, as well as anions interactions, were also investigated to understand the adsorption mechanisms further. The model parameters of isotherms and kinetics are estimated using nonlinear differential evolution optimization (DEO). Approaches like adaptive neuro-fuzzy inference system (ANFIS) and response surface methodology (RSM) are implemented to predict the fluoride removal and identify the optimal process values. The optimum removal efficiency of GAC-Fe3O4 (89.34%) was found to be higher than that of PAC-Fe3O4 (85.14%). Kinetics experiments indicated that they follow the intraparticle diffusion model, and adsorption isotherms indicated that they follow Langmuir and Freundlich models. Both PAC-Fe3O4 and GAC-Fe3O4 adsorbents have shown an adsorption capacity of 1.20 and 2.74 mg/g, respectively. The model predictions from ANFIS have a strong correlation with experimental results and superior to RSM predictions. The shape of the contours depicts the nonlinearity of the interactive effects and the mechanisms in the adsorption process.
Ikram Ahmad, Muhammad Asghar Jamal, Miara Iftikhar, Awais Ahmad, Shahid Hussain, Humaira Asghar, Muhammad Saeed, Ammar Bin Yousaf, Rama Rao Karri, Nada Sulaymaniyah Al-kadhi, Mohamed Ouladsmane, Ayman Ghfar, and Safia Khan
Coatings, eISSN: 20796412, Published: May 2021
MDPI AG
This work intended to enhance the unique and outstanding properties of lanthanum by synthesizing its nanocomposite. A lanthanum-based nanocomposite was prepared by a simple and cost-effective “co-precipitation” method. Lanthanum nitrate (La (NO3)3) and zinc nitrate (Zn (NO3)2) were used as precursors. The lanthanum/zinc oxide nano composite formed was then calcined at 450 °C for 4 h in order to obtain a fine powder with size in the nano range of 1–100 nm. Characterization of the prepared catalyst was done by ultraviolet/visible spectroscopy, Fourier transform infrared spectroscopy, and photoluminescence. Crystallinity and morphology were found by X-ray diffraction and scanning electron microscopy. The synthesized nanocomposite material was also tested for heterogeneous catalytic applications of 4-nitrophenol (4-NP) reduction into 4-aminophenol (4-AP). It was found to be successful in complete reduction of 4-NP with enhanced catalytic performance.
Madhu Vasaki E, Rama Rao Karri, Gobinath Ravindran, and Balasubramanian Paramasivan
Renewable Energy, ISSN: 09601481, eISSN: 18790682, Volume: 168, Pages: 204-215, Published: May 2021
Elsevier BV
Ahsan Mehmood, Fahad Saleem Ahmed Khan, Nabisab Mujawar Mubarak, Yie Hua Tan, Rama Rao Karri, Mohammad Khalid, Rashmi Walvekar, Ezzat Chan Abdullah, Sabzoi Nizamuddin, and Shaukat Ali Mazari
Environmental Science and Pollution Research, ISSN: 09441344, eISSN: 16147499, Pages: 19563-19588, Published: April 2021
Springer Science and Business Media LLC
Numerous contaminants in huge amounts are discharged to the environment from various anthropogenic activities. Waterbodies are one of the major receivers of these contaminants. The contaminated water can pose serious threats to humans and animals, by distrubing the ecosystem. In treating the contaminated water, adsorption processes have attained significant maturity due to lower cost, easy operation and environmental friendliness. The adsorption process uses various adsorbent materials and some of emerging adsorbent materials include carbon- and polymer-based magnetic nanocomposites. These hybrid magnetic nanocomposites have attained extensive applications in water treatment technologies due to their magnetic properties as well as combination of unique characteristics of organic and inorganic elements. Carbon- and polymer-related magnetic nanocomposites are more adapted materials for the removal of various kinds of contaminants from waterbodies. These nanocomposites can be produced via different approaches such as filling, pulse-laser irradiation, ball milling, and electro-spinning. This comprehensive review is compiled by reviewing published work of last the latest recent 3 years. The review article extensively focuses on different approaches for producing various carbon- and polymer-based magnetic nanocomposites, their merits and demerits and applications for sustainable water purification. More specifically, use of carbon- and polymer-based magnetic nanocomposites for removal of heavy metal ions and dyes is discussed in detail, critically analyzed and compared with other technologies. In addition, commercial viability in terms of regeneration of adsorbents is also reviewed. Furthermore, the future challenges and prospects in employing magnetic nanocomposites for contaminant removal from various water sources are presented.
M. Mallaiah, K. Rama Rao, and Ch. Venkateswarlu
Evolving Systems, ISSN: 18686478, eISSN: 18686486, Pages: 225-231, Published: March 2021
Springer Science and Business Media LLC
Fahad Saleem Ahmed Khan, N. M. Mubarak, Mohammad Khalid, Mohammad Mansoob Khan, Yie Hua Tan, Rashmi Walvekar, E. C. Abdullah, Rama Rao Karri, and Muhammad Ekhlasur Rahman
Critical Reviews in Solid State and Materials Sciences, ISSN: 10408436, eISSN: 15476561, Published: 2021
Informa UK Limited
J. N. Sahu, Rama Rao Karri, Hossain M. Zabed, Shahriar Shams, and Xianghui Qi
Separation and Purification Reviews, ISSN: 15422119, eISSN: 15422127, Pages: 139-158, Published: 2021
Informa UK Limited
Industrialization and urbanization are contributing extensively to the production of wastewater, which mostly ends up untreated in water bodies, leading to water pollution. Treatment of wastewater could be a promising approach in mitigating the pollution. Nano-biotechnology (NBT), which is an emerging technology, has excellent potential in wastewater treatment. Nano-materials have the ability to remove pollutants and pathogens by working either as the stand-alone treatment agents or by being incorporated into biological membranes and integrated with the conventional treatment techniques. This review presents an overview of possible applications of NBT in wastewater treatment, highlighting the antimicrobial activities of various nanomaterials, and describing the production of algal membrane-based bioreactor and microbial fuel cells. Significant difficulties in NBT utilization in wastewater treatment are also discussed. Further research directions needed to provide a sustainable method of water purification are proposed.
Fahad Saleem Ahmed Khan, Nabisab Mujawar Mubarak, Yie Hua Tan, Rama Rao Karri, Mohammad Khalid, Rashmi Walvekar, Ezzat Chan Abdullah, Shaukat Ali Mazari, and Sabzoi Nizamuddin
Environmental Science and Pollution Research, ISSN: 09441344, eISSN: 16147499, Pages: 43526-43541, Published: December 2020
Springer Science and Business Media LLC
Manpreet Kaur, N. M. Mubarak, Bridgid Lai Fui Chin, Mohammad Khalid, Rama Rao Karri, Rashmi Walvekar, E.C. Abdullah, and Faisal Amri Tanjung
IOP Conference Series: Materials Science and Engineering, ISSN: 17578981, eISSN: 1757899X, Volume: 943, Published: 2 November 2020
IOP Publishing
Yien Jun Lau, Rama Rao Karri, Nabisab Mujawar Mubarak, Sie Yon Lau, Han Bing Chua, Mohammad Khalid, Priyanka Jagadish, and Ezzat Chan Abdullah
Environmental Science and Pollution Research, ISSN: 09441344, eISSN: 16147499, Pages: 40121-40134, Published: 1 November 2020
Springer Science and Business Media LLC
Mohammad Hadi Dehghani, Rama Rao Karri, Eder C. Lima, Amir Hossein Mahvi, Shahrokh Nazmara, Abdol Mohammad Ghaedi, Mehdi Fazlzadeh, and Solmaz Gholami
Journal of Molecular Liquids, ISSN: 01677322, Volume: 315, Published: 1 October 2020
Elsevier BV
Mohammad Hadi Dehghani, Rama Rao Karri, Mahmood Alimohammadi, Shahrokh Nazmara, Ahmad Zarei, and Zhyar Saeedi
Journal of Molecular Liquids, ISSN: 01677322, Volume: 311, Published: 1 August 2020
Elsevier BV
Fahad Saleem Ahmed Khan, Nabisab Mujawar Mubarak, Mohammad Khalid, Rashmi Walvekar, Ezzat Chan Abdullah, Shaukat A. Mazari, Sabzoi Nizamuddin, and Rama Rao Karri
Environmental Science and Pollution Research, ISSN: 09441344, eISSN: 16147499, Pages: 24342-24356, Published: 1 July 2020
Springer Science and Business Media LLC
Lau Yien Jun, Rama Rao Karri, N.M. Mubarak, Lau Sie Yon, Chua Han Bing, Mohammad Khalid, Priyanka Jagadish, and E.C. Abdullah
Environmental pollution (Barking, Essex : 1987), eISSN: 18736424, Volume: 259, Pages: 113940, Published: 1 April 2020
Elsevier BV
Lau Yien Jun, Rama Rao Karri, Lau Sie Yon, N.M. Mubarak, Chua Han Bing, Khalid Mohammad, Priyanka Jagadish, and E.C. Abdullah
Environmental Research, ISSN: 00139351, eISSN: 10960953, Volume: 183, Published: April 2020
Elsevier BV
Lau Yien Jun, Rama Rao Karri, N.M. Mubarak, Lau Sie Yon, Chua Han Bing, Mohammad Khalid, Priyanka Jagadish, and E.C. Abdullah
Environmental Pollution, ISSN: 02697491, eISSN: 18736424, Volume: 259, Published: April 2020
Elsevier BV
Mohammad Hadi Dehghani, Rama Rao Karri, Zeinab Tafaroji Yeganeh, Amir Hossein Mahvi, Heshmatollah Nourmoradi, Mehdi Salari, Ahmad Zarei, and Mika Sillanpää
Journal of Molecular Liquids, ISSN: 01677322, Volume: 302, Published: 15 March 2020
Elsevier BV