July 9, 2019-May 12, 2025 PhD (PMRF) in Chemical Engineering
Indian Institute of Technology Kharagpur
o Thesis title: Photocatalytic degradation of antibiotics present in pharmaceutical wastewater
o Supervisor: Prof. Amar Nath Samanta
July 2017- May 2019 M. Tech in Chemical Engineering
Indian Institute of Technology Kharagpur
o Project title: Adsorptive removal of Arsenic (III) and Arsenic(V) from wastewater by LD slag Geopolymer
o Supervisor: Prof. Amar Nath Samanta
Aug 2012-June 2016 B. Tech in Chemical Engineering
Haldia Institute of Technology
RESEARCH, TEACHING, or OTHER INTERESTS
Chemical Engineering, Catalysis, Pollution, Environmental Engineering
17
Scopus Publications
193
Scholar Citations
8
Scholar h-index
8
Scholar i10-index
Scopus Publications
Solid Phase Microwave Assisted Synthesis N,S-GQDs as Nano-photocatalyst for Efficient Degradation of Nitrofurantoin and Methylene Blue under Visible Light: Comparative Studies, Mechanism Insight, and Extended Scope Shubham Raj, Subrata Das, Tushar Das Langmuir, 2026 Metal-free nanophotocatalysts generating radical species through indirect association of visible light have gained importance in remediating a variety of pollutants by obeying the principles of “green and sustainable”. Herein, four different doped and undoped graphene quantum dots were synthesized using a novel solid phase microwave assisted (SPMW) strategy, namely, graphene quantum dots (GQDs), nitrogen-doped GQDs (N-GQDs), sulfur-doped GQDs (S-GQDs), and nitrogen and sulfur co-doped GQDs (N,S-GQDs). The as-prepared N,S-GQDs with uniform size distribution (∼4.5 nm) and demonstrating excellent visible light entrapment ability resulting from separated electron–hole pairs (e––h+) were used for degrading environmentally benign pollutants nitrofurnatoin (NFR) and methylene blue (MB). Comparative assessment revealed N,S-GQDs to have the highest degradation efficiency for both NFR and MB, ∼95% (k1 = 0.018 min–1) and 96% (k1 = 0.048 min–1), respectively, within 120 min exposure and without aid of external oxidants. Furthermore, the extended scope of N,S-GQDs prompted a similar trend in degradation of tetracycline (TC) and malachite green (MG) under established optimal conditions. In addition, the designed N,S-GQDs showed excellent recyclability up to five consecutive cycles with catalyst loading only 0.01 mg mL–1 and without any compositional loss over time. The mechanistic study modeled using radical trapping experimentation, lifetime analysis, and fragment mass analysis revealed the indirect association of OH• and O2•– created from photogenerated charge carriers have triggered the degradation. Our results potentiate the cost-effective and cheaper preparation of N,S-GQDs using SPMW and open newer avenues for its photocatalysts based applications that are intended for remediating organic pollutants.
A Rapid and Complete Photodegradation of Doxycycline Using rGO@CuO Nanocomposite Under Visible and Direct Sunlight: Mechanistic Insights and Real-Time Applicability Panchraj Verma, Subrata Das, Shubham Raj, Raphaël Schneider Nanomaterials, 2025 In this study, a simple and efficient hydrothermal strategy was developed to modify reduced graphene oxide (rGO) with copper (II) oxide (CuO) nanoparticles by varying the weight ratio of rGO relative to CuO (rGO@CuO1:1, rGO@CuO1:2, and rGO@CuO2:1). The obtained materials were further characterized using analytical tools. Photocatalytic performance was assessed using adsorption–photocatalysis experiments under a household LED light source (10 W, λ > 400 nm), and the degree of degradation of doxycycline (DOX) was evaluated using UV-Vis spectrophotometer. The highest efficiency of 100% was achieved with a DOX concentration of 70 ppm, rGO@CuO1:1 dosage of 1 mg/mL, and pH 7 within 30 min of irradiation. The degradation kinetics followed the pseudo-first-order model (R2 ~0.99) and the Langmuir adsorption isotherm, indicating that DOX on the surface is governed by a dynamic equilibrium between adsorption and degradation rates. Furthermore, efficacy was tested using real water samples, and the recyclability of the catalyst was evaluated in up to five cycles.
Boosting CO2 Uptake Potential of Amine Functionalized UiO-66 Nanoparticles Using Sonochemical Synthesis: Experimental Observations, Isotherm, Response Surface Methodology, and Exploring Artificial Neural Network Modeling Puspendu Sardar, Devansh Kumar, Guruprasad Bhattacharya, Radhapada Manna, Shubham Raj, Sibsankar Rahut, Amar Nath Samanta Energy and Fuels, 2025 The rising carbon dioxide (CO2) concentration in the atmosphere poses significant environmental problems, especially global warming and climate change. To mitigate this issue, one of the most effective ways to enhance CO2 uptake efficiency at low pressure is to impregnate amine into the porous network structure of a suitable metal–organic framework (MOF) adsorbent. In this context, the influence of functionalization of UiO-66 nanoparticles with aminoethylethanolamine (AEEA) over CO2 adsorption was investigated. UiO-66 is renowned for its outstanding thermal and chemical stability compared to other materials. We synthesized nanoporous UiO-66 and UiO-66-NH2 adsorbents by the novel sonochemical method in only 2 h. The amine-incorporated materials were characterized using HRXRD, Raman spectroscopy, FTIR, FESEM, EDX, HRTEM, TGA, XPS, BET, and CHNS analysis, revealing findings comparable to pristine UiO-66 nanoparticles. The CO2 uptake behavior of the samples was analyzed employing the iSorb HP2 high-pressure gas adsorption analyzer under conditions of pressure and temperature swings, ranging from 0 to 30 bar and 25 to 80 °C, respectively. Various mathematical isotherm models were developed to correlate and forecast experimental CO2 sorption capability. Response surface methodology based on the Box–Behnken design is a statistical model employed to optimize circumstances for CO2 adsorption performance. The multilayer perceptron artificial neural networks model was developed to predict CO2 sorption properties by employing a back-propagation training approach. Remarkably, the 30% AEEA modified UiO-66 adsorbent manifested a significant augmentation in CO2 uptake efficacy (3.983 mmol/g), which was 3.06 times greater than the pristine UiO-66 nanoparticles (1.301 mmol/g) at the temperature of 25 °C and a partial pressure of 1 bar.
Design and Sustainable Synthesis of rGO@TiO2 as Visible Light Photo-Catalyst for Decontamination of Norfloxacin from Discharge Waters Panchraj Verma, Subrata Das, Shubham Raj, Chandramika Bora Chemistryselect, 2025 Here, we have reported the synthesis of rGO modified with TiO 2 at various proportions, along with its scale‐up using a facile and greener probe sonication method. The rGO@TiO 2 nanocomposite was characterized structurally and morphologically and used as an efficient heterogeneous photocatalyst for the degradation of generic norfloxacin (NOR) from wastewater. The photosensitization of rGO@TiO 2 exhibited a shift in the absorption edge towards the visible region and separation of the induced charge carriers. Optimized results showed rGO@TiO 2 (compositional ratio‐2:1 w/w, dose‐1 mg mL −1 , and pH‐8) achieved the highest degradation with degradation efficiency (Qe) ∼97% within 90 mins of irradiation. Scavenging experiments confirmed the active role of O 2 •‐ for the degradation, which leads to the 62% conversion of initial organic carbon to harmless CO 2 calculated using a TOC analyzer. The photodegradation kinetics of NOR fits well with pseudo‐1 st ‐order kinetics and follows the Langmuir‐Hinshelwood mechanism(R 2 ∼ 0.99). The comparative assessment for the real‐time utility of rGO@TiO 2 was performed using a real sample of generic NOR and river/pond water that showed similar Qe ∼96% with catalyst reusability up to 5 cycles. Overall, the findings indicate the development of a sustainable and cost‐effective photocatalyst, rGO@TiO 2 , that can be intended for decontamination of pharmaceutical pollutants from contaminated waters.
Construction of a novel SnS2/MIL-88A (Fe) Z-scheme for boosting charge transfer assisted with peroxymonosulfate for the effective photocatalytic degradation of Norfloxacin … S Raj, AN Samanta Separation and Purification Technology 371, 133341 , 2025 2025.0 Citations: 15
Novel Zn/MoSe2 nanoflower with selenium vacancies for the effective charge separation, photo-electrochemical study and efficient visible-light degradation of Ciprofloxacin S Raj, Y Thakur, P Sardar, AN Samanta Advanced Powder Technology 36 (9), 105020 , 2025 2025.0 Citations: 4
Enhanced CO2 adsorption efficiency through aminoethylethanolamine functionalized porous ZIF-8 nanoparticles: Experimental investigations, isotherm and RSM modeling P Sardar, R Manna, G Bhattacharya, S Raj, S Yadav, S Rahut, ... Separation and Purification Technology 360, 131090 , 2025 2025.0 Citations: 13
Boosting CO 2 Uptake Potential of Amine Functionalized UiO-66 Nanoparticles Using Sonochemical Synthesis: Experimental Observations, Isotherm, Response … P Sardar, D Kumar, G Bhattacharya, R Manna, S Raj, S Rahut, ... Energy & Fuels 39 (25), 12086-12107 , 2025 2025.0 Citations: 5
Synthesis of n-type Zinc-doped metal dichalcogenide for efficient visible light photocatalytic degradation of Antibiotic and photo-electrochemical study S Raj, AN Samanta MDPI , 2025 2025.0
Construction of a novel Bi2S3/MIL-101 (Fe) Z-scheme heterojunction for the effective visible-light assisted photocatalytic degradation of tetracycline hydrochloride … S Raj, Y Chainy, P Sardar, AN Samanta Surfaces and Interfaces 60, 106011 , 2025 2025.0 Citations: 20
Synthesis of n-Type Metal Doped Molybdenum Diselenide for the Efficient Visible-Light Photocatalytic Degradation of an Antibiotic and Photo-Electrochemical Study S Raj, AN Samanta 2024 AIChE Annual Meeting , 2024 2024.0
Construction of a visible light responsive dual Z-scheme NH2-MIL-101 (Fe)/CdS/g-C3N4 ternary heterojunction photocatalyst for efficient CO2 photoreduction to methanol R Manna, G Bhattacharya, P Sardar, S Raj, A Jain, AN Samanta Chemical Engineering Science 288, 119811 , 2024 2024.0 Citations: 36
Spinel ZnMn2O4 nanosphere for the efficient Sulfamethazine degradation under visible light irradiation and photoelectrochemical study S Raj, R Manna, AN Samanta Journal of Environmental Chemical Engineering 12 (2), 112277 , 2024 2024.0 Citations: 27
Excellent CO2 adsorption performance of amine-impregnated highly porous ZIF-8 adsorbent: experimental and isotherm modeling studies P Sardar, G Bhattacharya, R Manna, S Raj, S Rahut, AN Samanta Advanced Powder Technology 35 (2), 104344 , 2024 2024.0 Citations: 25
Boosting photocatalytic CO2 reduction efficiency by graphene nanoflakes (GNF) decorated ZIF-67 under visible light irradiation R Manna, G Bhattacharya, S Raj, AN Samanta Journal of Environmental Chemical Engineering 12 (1), 111722 , 2024 2024.0 Citations: 31
Enhanced Electron Trapping Protocol of MIL-100 (Fe) via Different Synthetic Routes for the Effective Visible Light Degradation of Sulfamethazine S Raj, S Rahut, R Manna, AN Samanta Indian Chemical Engineering Congress, 663-684 , 2023 2023.0 Citations: 2
Box-behnken design for the photocatalytic degradation of sulfamethazine using Mil-100 (Fe) as a photocatalyst S Raj, AN Samanta Chemical Engineering Transactions 98, 129-134 , 2023 2023.0 Citations: 15
Loading of Tin sulfideover Metal Organic Framework for boosting visible-light photocatalytic degradation of Norfloxacin S Raj, AN Samanta
MOST CITED SCHOLAR PUBLICATIONS
Construction of a visible light responsive dual Z-scheme NH2-MIL-101 (Fe)/CdS/g-C3N4 ternary heterojunction photocatalyst for efficient CO2 photoreduction to methanol R Manna, G Bhattacharya, P Sardar, S Raj, A Jain, AN Samanta Chemical Engineering Science 288, 119811 , 2024 2024.0 Citations: 36
Boosting photocatalytic CO2 reduction efficiency by graphene nanoflakes (GNF) decorated ZIF-67 under visible light irradiation R Manna, G Bhattacharya, S Raj, AN Samanta Journal of Environmental Chemical Engineering 12 (1), 111722 , 2024 2024.0 Citations: 31
Spinel ZnMn2O4 nanosphere for the efficient Sulfamethazine degradation under visible light irradiation and photoelectrochemical study S Raj, R Manna, AN Samanta Journal of Environmental Chemical Engineering 12 (2), 112277 , 2024 2024.0 Citations: 27
Excellent CO2 adsorption performance of amine-impregnated highly porous ZIF-8 adsorbent: experimental and isotherm modeling studies P Sardar, G Bhattacharya, R Manna, S Raj, S Rahut, AN Samanta Advanced Powder Technology 35 (2), 104344 , 2024 2024.0 Citations: 25
Construction of a novel Bi2S3/MIL-101 (Fe) Z-scheme heterojunction for the effective visible-light assisted photocatalytic degradation of tetracycline hydrochloride … S Raj, Y Chainy, P Sardar, AN Samanta Surfaces and Interfaces 60, 106011 , 2025 2025.0 Citations: 20
Construction of a novel SnS2/MIL-88A (Fe) Z-scheme for boosting charge transfer assisted with peroxymonosulfate for the effective photocatalytic degradation of Norfloxacin … S Raj, AN Samanta Separation and Purification Technology 371, 133341 , 2025 2025.0 Citations: 15
Box-behnken design for the photocatalytic degradation of sulfamethazine using Mil-100 (Fe) as a photocatalyst S Raj, AN Samanta Chemical Engineering Transactions 98, 129-134 , 2023 2023.0 Citations: 15
Enhanced CO2 adsorption efficiency through aminoethylethanolamine functionalized porous ZIF-8 nanoparticles: Experimental investigations, isotherm and RSM modeling P Sardar, R Manna, G Bhattacharya, S Raj, S Yadav, S Rahut, ... Separation and Purification Technology 360, 131090 , 2025 2025.0 Citations: 13
Boosting CO 2 Uptake Potential of Amine Functionalized UiO-66 Nanoparticles Using Sonochemical Synthesis: Experimental Observations, Isotherm, Response … P Sardar, D Kumar, G Bhattacharya, R Manna, S Raj, S Rahut, ... Energy & Fuels 39 (25), 12086-12107 , 2025 2025.0 Citations: 5
Novel Zn/MoSe2 nanoflower with selenium vacancies for the effective charge separation, photo-electrochemical study and efficient visible-light degradation of Ciprofloxacin S Raj, Y Thakur, P Sardar, AN Samanta Advanced Powder Technology 36 (9), 105020 , 2025 2025.0 Citations: 4
Enhanced Electron Trapping Protocol of MIL-100 (Fe) via Different Synthetic Routes for the Effective Visible Light Degradation of Sulfamethazine S Raj, S Rahut, R Manna, AN Samanta Indian Chemical Engineering Congress, 663-684 , 2023 2023.0 Citations: 2
Synthesis of n-type Zinc-doped metal dichalcogenide for efficient visible light photocatalytic degradation of Antibiotic and photo-electrochemical study S Raj, AN Samanta MDPI , 2025 2025.0
Synthesis of n-Type Metal Doped Molybdenum Diselenide for the Efficient Visible-Light Photocatalytic Degradation of an Antibiotic and Photo-Electrochemical Study S Raj, AN Samanta 2024 AIChE Annual Meeting , 2024 2024.0
Loading of Tin sulfideover Metal Organic Framework for boosting visible-light photocatalytic degradation of Norfloxacin S Raj, AN Samanta
