ORCID Profile
0000-0003-0589-1693
Current Organisations
University of Veterinary Medicine Vienna
,
Central Soil Salinity Research Institute
,
Carnegie Mellon University
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Publications
A mechanistic insight into the shrinkage and swelling of Ca-montmorillonite upon adsorption of chain-like ranitidine in an aqueous system
Publisher: Elsevier BV
Date: 03-2023
Insight and mechanisms of tetracycline adsorption on sodium alginate/montmorillonite composite beads
Publisher: Elsevier BV
Date: 12-2023
Fe-exchanged nano-bentonite outperforms Fe3O4 nanoparticles in removing nitrate and bicarbonate from wastewater
Publisher: Elsevier BV
Date: 08-2019
DOI: 10.1016/J.JHAZMAT.2019.05.025
Abstract: Nitrate (NO
Challenges and opportunities in sustainable management of microplastics and nanoplastics in the environment
Publisher: Elsevier BV
Date: 05-2022
DOI: 10.1016/J.ENVRES.2021.112179
Abstract: The accumulation of microplastics (MPs) and nanoplastics (NPs) in terrestrial and aquatic ecosystems has raised concerns because of their adverse effects on ecosystem functions and human health. Plastic waste management has become a universal problem in recent years. Hence, sustainable plastic waste management techniques are vital for achieving the United Nations Sustainable Development Goals. Although many reviews have focused on the occurrence and impact of micro- and nanoplastics (MNPs), there has been limited focus on the management of MNPs. This review first summarizes the ecotoxicological impacts of plastic waste sources and issues related to the sustainable management of MNPs in the environment. This paper then critically evaluates possible approaches for incorporating plastics into the circular economy in order to cope with the problem of plastics. Pollution associated with MNPs can be tackled through source reduction, incorporation of plastics into the circular economy, and suitable waste management. Appropriate infrastructure development, waste valorization, and economically sound plastic waste management techniques and viable alternatives are essential for reducing MNPs in the environment. Policymakers must pay more attention to this critical issue and implement appropriate environmental regulations to achieve environmental sustainability.
Comparison of properties and aquatic arsenic removal potentials of organically modified smectite adsorbents
Publisher: Elsevier BV
Date: 09-2019
DOI: 10.1016/J.JHAZMAT.2019.05.053
Abstract: Arsenic (As) poses a tremendous threat to human health due to exposure through arsenic-contaminated drinking water and/or food. We aimed to develop organically modified clay adsorbents for the removal of As from aqueous solution. We modified a smectite s le using three organic agents, namely hexadecyl trimethylammonium (HDTMA), chitosan and citric acid, and characterized the products using X-ray diffraction, infrared spectroscopy, and scanning electron microscopy techniques. The characterization techniques suggested successful organic modifications of the smectite s le. The surfactant-modified smectite was the most efficient (66.9%) As removing adsorbent with a maximum adsorption capacity of 473.2 μg g
Inorganically modified clay minerals: Preparation, characterization, and arsenic adsorption in contaminated water and soil
Publisher: Elsevier BV
Date: 10-2017
Arsenic Adsorption on Modified Clay Minerals in Contaminated Soil and Water: Impact of pH and Competitive Anions
Publisher: Wiley
Date: 09-02-2021
Nanomaterials for sustainable remediation of chemical contaminants in water and soil
Publisher: Informa UK Limited
Date: 25-02-2021
The role of soils in the disposition, sequestration and decontamination of environmental contaminants
Publisher: The Royal Society
Date: 04-08-2021
Abstract: Soil serves as both a ‘source’ and ‘sink’ for contaminants. As a source, contaminants are derived from both ‘geogenic’ and ‘anthropogenic’ origins. Typically, while some of the inorganic contaminants including potentially toxic elements are derived from geogenic origin (e.g. arsenic and selenium) through weathering of parent materials, the majority of organic (e.g. pesticides and microplastics) as well as inorganic (e.g. lead, cadmium) contaminants are derived from anthropogenic origin. As a sink, soil plays a critical role in the transformation of these contaminants and their subsequent transfer to environmental compartments, including groundwater (e.g. pesticides), surface water (phosphate and nitrate), ocean (e.g. microplastics) and atmosphere (e.g. nitrous oxide emission). A complex transformation process of contaminants in soil involving adsorption, precipitation, redox reactions and biodegradation control the mobility, bioavailability and environmental toxicity of these contaminants. Soil also plays a major role in the decontamination of contaminants, and the ‘cleaning’ action of soil is controlled primarily by the physico-chemical interactions of contaminants with various soil components, and the biochemical transformations facilitated by soil microorganisms. In this article, we examine the geogenic and anthropogenic sources of contaminants reaching the soil, and discuss the role of soil in the sequestration and decontamination of contaminants in relation to various physico-chemical and microbial transformation reactions of contaminants with various soil components. Finally, we propose future actions that would help to maintain the role of soils in protecting the environment from contaminants and delivering sustainable development goals. This article is part of the theme issue ‘The role of soils in delivering Nature's Contributions to People’.
Novel MOF-808 metal–organic framework as highly efficient adsorbent of perfluorooctane sulfonate in water
Publisher: Elsevier BV
Date: 10-2022
DOI: 10.1016/J.JCIS.2022.05.050
Abstract: Perfluorooctane sulfonate (PFOS) is a highly persistent contaminant of emerging concern causing harmful effects to human and ecosystem health. In this study, a novel MOF-808 metal-organic framework (MOF) was prepared and evaluated for adsorptive removal of PFOS from aqueous solution. The MOF-808 had high specific surface area (SSA 1610 m
Inland saline aquaculture increased carbon accumulation rate and stability in pond sediments under semi-arid climate
Publisher: Springer Science and Business Media LLC
Date: 02-11-2021
Designer biochar with enhanced functionality for efficient removal of radioactive cesium and strontium from water
Publisher: Elsevier BV
Date: 11-2022
DOI: 10.1016/J.ENVRES.2022.114072
Abstract: Radioactive elements released into the environment by accidental discharge constitute serious health hazards to humans and other organisms. In this study, three gasified biochars prepared from feedstock mixtures of wood, chicken manure, and food waste, and a KOH-activated biochar (40% food waste + 60% wood biochar (WFWK)) were used to remove cesium (Cs
Natural and engineered clays and clay minerals for the removal of poly- and perfluoroalkyl substances from water: State-of-the-art and future perspectives
Publisher: Elsevier BV
Date: 06-2022
Distribution, transformation and remediation of poly- and per-fluoroalkyl substances (PFAS) in wastewater sources
Publisher: Elsevier BV
Date: 08-2022
Distribution, behaviour, bioavailability and remediation of poly- and per-fluoroalkyl substances (PFAS) in solid biowastes and biowaste-treated soil
Publisher: Elsevier BV
Date: 10-2021
Facile one pot preparation of magnetic chitosan-palygorskite nanocomposite for efficient removal of lead from water
Publisher: Elsevier BV
Date: 02-2022
DOI: 10.1016/J.JCIS.2021.09.109
Abstract: Development of polymeric magnetic adsorbents is a promising approach to obtain efficient treatment of contaminated water. However, the synthesis of magnetic composites involving multiple components frequently involves tedious preparation steps. In the present study, a magnetic chitosan-palygorskite (MCP) nanocomposite was prepared through a straight-forward one pot synthesis approach to evaluate its lead (Pb
Biochar-microorganism interactions for organic pollutant remediation: Challenges and perspectives
Publisher: Elsevier BV
Date: 09-2022
DOI: 10.1016/J.ENVPOL.2022.119609
Abstract: Numerous harmful chemicals are introduced every year in the environment through anthropogenic and geological activities raising global concerns of their ecotoxicological effects and decontamination strategies. Biochar technology has been recognized as an important pillar for recycling of biomass, contributing to the carbon capture and bioenergy industries, and remediation of contaminated soil, sediments and water. This paper aims to critically review the application potential of biochar with a special focus on the synergistic and antagonistic effects on contaminant-degrading microorganisms in single and mixed-contaminated systems. Owing to the high specific surface area, porous structure, and compatible surface chemistry, biochar can support the proliferation and activity of contaminant-degrading microorganisms. A combination of biochar and microorganisms to remove a variety of contaminants has gained popularity in recent years alongside traditional chemical and physical remediation technologies. The microbial compatibility of biochar can be improved by optimizing the surface parameters so that toxic pollutant release is minimized, biofilm formation is encouraged, and microbial populations are enhanced. Biocompatible biochar thus shows potential in the bioremediation of organic contaminants by harboring microbial populations, releasing contaminant-degrading enzymes, and protecting beneficial microorganisms from immediate toxicity of surrounding contaminants. This review recommends that biochar-microorganism co-deployment holds a great potential for the removal of contaminants thereby reducing the risk of organic contaminants to human and environmental health.
Clay–polymer nanocomposites: Progress and challenges for use in sustainable water treatment
Publisher: Elsevier BV
Date: 02-2020
DOI: 10.1016/J.JHAZMAT.2019.121125
Abstract: Contaminant removal from water involves various technologies among which adsorption is considered to be simple, effective, economical, and sustainable. In recent years, nanocomposites prepared by combining clay minerals and polymers have emerged as a novel technology for cleaning contaminated water. Here, we provide an overview of various types of clay-polymer nanocomposites focusing on their synthesis processes, characteristics, and possible applications in water treatment. By evaluating various mechanisms and factors involved in the decontamination processes, we demonstrate that the nanocomposites can overcome the limitations of in idual polymer and clay components such as poor specificity, pH dependence, particle size sensitivity, and low water wettability. We also discuss different regeneration and wastewater treatment options (e.g., membrane, coagulant, and barrier/columns) using clay-polymer nanocomposites. Finally, we provide an economic analysis of the use of these adsorbents and suggest future research directions.
DNA copy number changes define spatial patterns of heterogeneity in colorectal cancer
Publisher: Springer Science and Business Media LLC
Date: 25-01-2017
DOI: 10.1038/NCOMMS14093
Abstract: Genetic heterogeneity between and within tumours is a major factor determining cancer progression and therapy response. Here we examined DNA sequence and DNA copy-number heterogeneity in colorectal cancer (CRC) by targeted high-depth sequencing of 100 most frequently altered genes. In 97 s les, with primary tumours and matched metastases from 27 patients, we observe inter-tumour concordance for coding mutations in contrast, gene copy numbers are highly discordant between primary tumours and metastases as validated by fluorescent in situ hybridization. To further investigate intra-tumour heterogeneity, we dissected a single tumour into 68 spatially defined s les and sequenced them separately. We identify evenly distributed coding mutations in APC and TP5 3 in all tumour areas, yet highly variable gene copy numbers in numerous genes. 3D morpho-molecular reconstruction reveals two clusters with ergent copy number aberrations along the proximal–distal axis indicating that DNA copy number variations are a major source of tumour heterogeneity in CRC.
Synthesis and characterization of PCN-222 metal organic framework and its application for removing perfluorooctane sulfonate from water
Publisher: Elsevier BV
Date: 04-2023
Related Organisations
Related Funding Activities
No related grants have been discovered for Raj Mukhopadhyay.