Article
Environmental Sciences
G. Sarojini, S. Venkatesh Babu, N. Rajamohan, M. Rajasimman
Summary: The experimental investigation evaluated the feasibility and performance of a polymer hybrid bio-nano composite for removing malachite green under controlled conditions. The study found that at neutral pH, using a 50mg dosage achieved maximum removal efficiency, fitting well with Langmuir isotherm and pseudo second order kinetic models. The adsorption mechanism was identified as electrostatic attraction and hydrogen bonding, confirming the potential of the polymer nanocomposite as an effective adsorbent for malachite green removal.
ENVIRONMENTAL RESEARCH
(2022)
Article
Polymer Science
Mahmoud H. Abu Elella, Nema Aamer, Yasser M. A. Mohamed, Hossam A. El Nazer, Riham R. Mohamed
Summary: In this study, high-efficient novel anionic adsorbent hydrogels were synthesized via free-radical polymerization and their properties were examined using various analysis techniques. The results demonstrated that the prepared hydrogels exhibited excellent swelling and adsorption capacities, making them effective for dye removal in water.
Article
Chemistry, Multidisciplinary
Fouad El Mansouri, Hammadi El Farissi, Mohamed Hassani Zerrouk, Francesco Cacciola, Chaimae Bakkali, Jamal Brigui, Miguel Palma Lovillo, Joaquim C. G. Esteves da Silva
Summary: In this study, barley seeds and barley biochar were utilized for the removal of textile finishing dyes in aqueous solutions. The adsorption equilibrium data fitted well with Langmuir and Freundlich isotherm models, and the adsorption process followed pseudo-second-order kinetics. Thermodynamic results showed that the removal of dyes on barley was endothermic and spontaneous.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Environmental
Tamara Alomar, Hazim Qiblawey, Fares Almomani, Riyadh I. Al-Raoush, Dong Suk Han, Nasir M. Ahmad
Summary: According to the review, many adsorbents showed good performance in removing humic acid from wastewater, including carbon-based and activated carbons, clay-based adsorbents, zeolites, iron-based/magnetic adsorbents, functionalized adsorbents, and natural adsorbents. Future research should focus on continuous adsorption processes, using actual wastewater for adsorption experiments, and cost analysis for industrial scale-up.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Chemical
Yinghua Song, Shengming Chen, Hui Xu
Summary: The study demonstrates that walnut shell is a cost-effective and efficient adsorbent for the removal of malachite green from wastewater, showing high removal efficiency and promising practical application potential.
DESALINATION AND WATER TREATMENT
(2021)
Article
Materials Science, Paper & Wood
Xiyao Liu, Yilin Wu, Wenchang Zhao, Zhuanrong Wu, Hua Han, Zhenbang Xie, Murat Yilmaz, Tzu-Hsing Ko
Summary: The decolorization of malachite green (MG) from the aqueous phase was examined using tea stalk powder. The adsorption efficiency decreased with the initial MG concentration, ionic strength of the solution, and heavy metal content. A suitable initial MG concentration of up to 200 mg/L can be accepted since adsorption efficiency of more than 95% is achieved. Different adsorption kinetic models were employed to fit the experimental data, and the pseudo second-order model provided the best fit. The calculated adsorption capacities using the pseudo second-order model were close to the experimental data for different initial MG concentrations ranging from 24.27 to 158.7 mg/g. The Langmuir isotherm fit well, and thermodynamic investigation revealed that the adsorption of MG by tea stalk powder was feasible, endothermic, and spontaneous. Regeneration/adsorption experiments showed that the tea stalk powder retained more than 95% efficiency after six cycles using NaOH as the desorbent, indicating its potential for multiple uses. In conclusion, tea stalk demonstrates significant potential as a cost-effective adsorbent for the removal of MG.
Review
Engineering, Chemical
Divyashree Somashekara, Lavanya Mulky
Summary: Adsorption plays a crucial role in environmental decontamination and various isotherm models and modification techniques have been studied to enhance its efficiency. This review focuses on recent literature discussing adsorption mechanisms, kinetic models, breakthrough curve modeling, thermodynamic concepts, and regeneration methods.
CHEMBIOENG REVIEWS
(2023)
Article
Environmental Sciences
Meng Lu, Yao Wang, Junxia Yu, Dezeng Li, Qingbiao Zhao, Ruan Chi
Summary: Phosphogypsum (PG) was used as an adsorbent for dyes in wastewater, and surfactant-modified phosphogypsum (ODBAC@PG) with high adsorption capability for anionic dyes was prepared. The adsorption process followed the pseudo-second-order kinetic model and Langmuir adsorption isotherm. MeB and IC showed antagonistic effects on each other in the binary adsorption system, and ODBAC@PG exhibited high reusability. The adsorption mechanism involved electrostatic interaction, hydrogen bond, and hydrophobic interaction.
ENVIRONMENTAL RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
R. M. A. S. Dhananjana Rajakaruna, B. G. N. Sewwandi, Mohamed M. M. Najim, Mirza Barjees Baig, Bader Alhafi Alotaibi, Abou Traore
Summary: A comprehensive study on heavy metal removal from wastewater using sludge as an absorbent has been conducted, providing researchers and practitioners with valuable insights for planning wastewater treatment processes. The study highlights the importance of the physicochemical properties of sludge and the nature of metal ions in heavy metal adsorption. Factors such as pH, temperature, initial metal concentrations, contact time, and adsorbent dose are found to significantly influence the adsorption characteristics. Additionally, the study emphasizes the need for further research on the regeneration, metal recovery, and recycling of sludge-based adsorbents.
Article
Environmental Sciences
Priyanka Priyadarsini Samal, Jyoti Kumari, Md. Atif Qaiyum, Jhilirani Mohanta, Roshni Kumari, Subhashri Dutta, Banashree Dey, Soumen Dey
Summary: In this study, acid-assisted thiosulfate-impregnated spent tea leaves were found to have enhanced performance in the removal of malachite green from water. The material showed high adsorption capacity and the ability to be regenerated and reused. This research highlights the potential of utilizing waste tea leaves for efficient water treatment.
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
(2022)
Article
Environmental Sciences
Na Lv, Xiufen Li
Summary: The study investigated the adsorption of phosphorus in low-concentration phosphorus wastewater using a modified calcium-modified attapulgite (Ca-GAT). The study explored the effects of various parameters on dynamic phosphorus adsorption and found that the adsorption ability improved with increased bed height and flow rate, and decreased initial phosphorus concentration. Breakthrough curves were fitted using four models, with the Thomas model determining a maximum adsorption amount of 13.477 mg/g. The study also found that NaOH regeneration had the best effect, and the breakthrough point was achieved after 177 hours in treating actual MBR effluent. These findings suggest that Ca-GAT has potential for the treatment of low-concentration phosphorus wastewater.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Materials Science, Ceramics
Rohit Jasrotia, Suman, Ankit Verma, Ritesh Verma, Sachin Kumar Godara, Jahangeer Ahmed, Amir Mehtab, Tokeer Ahmad, Pooja Puri, Susheel Kalia
Summary: The study successfully fabricated nanophotocatalysts with high photocatalytic degradation efficiency. By investigating the structural, morphological, optical, and magnetic properties of different doped and undoped samples, it was found that ZM3 nanoferrite showed the best degradation performance.
CERAMICS INTERNATIONAL
(2022)
Article
Green & Sustainable Science & Technology
Omar Falyouna, Khaoula Bensaida, Ibrahim Maamoun, U. P. M. Ashik, Atsushi Tahara, Kazuya Tanaka, Noboru Aoyagi, Yuji Sugihara, Osama Eljamal
Summary: In this study, a modified precipitation technique was used to synthesize hybrid magnesium hydroxide/magnesium oxide nanorods (Mg(OH)(2)/MgO), which showed excellent adsorption capacity for the antibiotic ciprofloxacin (CIP) in water. The synthesized Mg(OH)(2)/MgO was characterized by various analysis techniques. The results demonstrated that Mg(OH)(2)/MgO efficiently removed CIP from water within a short period of time, and its adsorption capacity was at least 2-fold higher compared to other reported nanomaterials. The spent Mg(OH)(2)/MgO was also analyzed, revealing the mechanisms responsible for CIP adsorption. Additionally, the promising performance of Mg(OH)(2)/MgO in treating simulated CIP-contaminated river water was demonstrated.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Tianguang Zhang, Roberto M. Narbaitz, Majid Sartaj, Jason Downey
Summary: Limited research has been conducted on ammonium removal by zeolites followed by chlorine regeneration, and most studies used batch tests and focused on single solute solutions instead of multi-component ones. This study used a continuous-flow ion exchange column system to assess the feasibility of chlorine regeneration of a zeolite column for ammonium removal from synthetic explosives impacted mining wastewater. The results showed that NaOCl and salt regeneration had similar performance, but NaOCl regeneration took longer. Additionally, the effluent pH, total chlorine level, and free chlorine level during chlorine regeneration were positively related to ammonium oxidation and hydrogen ion production.
Article
Environmental Sciences
Roshan Rai, B. S. Vijayakumar
Summary: The fungal isolate Aspergillus tamarii was able to decolorize the toxic and recalcitrant textile dyes Malachite Green and Reactive Black 5. UV-vis spectra showed a reduction in peak intensity over a period of 5 days. The decolorization efficiency was calculated to be 97.17% for Malachite Green and 96.65% for Reactive Black 5 at 30°C and pH 7. The treated dye samples did not inhibit the growth of four common bacterial strains. Regeneration assay confirmed the ability of Aspergillus tamarii to withstand high concentrations of dyes and regrow in suitable medium, indicating no detrimental impact on its survival.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Materials Science, Multidisciplinary
Utpal Ghosh, Ankush Majumdar, Anjali Pal
Summary: A novel 3D macroporous structure of graphitic carbon nitride composed of self-assembled 2D nitrogen vacancy engineered nanosheets was fabricated through a facile synthesis method. The photocatalyst exhibited superior photocatalytic efficiency towards tetracycline antibiotic degradation under LED light illumination, attributed to its extended visible light extraction efficiency, increased suppression efficacy of charge carriers, and porous structure. The material also showed excellent stability even after five cycles of photocatalytic tetracycline degradation.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Environmental Sciences
Sandeep Kumar, Ravinderdeep Singh Brar, J. Nagendra Babu, Amarjeet Dahiya, Sandip Saha, Avneesh Kumar
Summary: The study characterized the nano-zerovalent copper supported by pistachio shell powder, which exhibited excellent adsorption capacity for Cr(VI) under optimized conditions with a maximum removal rate of 110.9 mg/g.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Chemistry, Physical
Imon Kalyan, Tarasankar Pal, Anjali Pal
Summary: The study successfully synthesized two different sizes of hollow gold nanoparticles through Galvanic replacement reaction (GRR) and immobilized them on cationic surfactant-modified silica. It was found that smaller particles exhibited higher catalytic activity than larger particles, and solid-supported catalysts showed advantages in terms of shelf-life and ease of application compared to solution-phase catalysts.
SURFACES AND INTERFACES
(2021)
Article
Engineering, Environmental
Utpal Ghosh, Anjali Pal
Summary: An all-solid-state Z scheme composite with excellent photocatalytic degradation performance and stability has been successfully designed through a single-step hydrothermal treatment.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
S. Kumar, R. Singh Brar, S. Saha, A. Dahiya, Kalpana, J. Nagendra Babu
Summary: In this study, a simple method was used to prepare MnO2 nanostructures supported by pistachio shell powder. The nMPP showed multi-process removal of crystal violet (CV) dye under different pH conditions. Under acidic conditions, nMPP caused oxidative degradation of CV through the generation of hydroxyl radicals. Under neutral conditions, CV was adsorbed onto the surface of nMPP in a monolayer manner. The synergistic effect between the adsorption efficiency of pistachio shell biomass and nano-MnO2 enabled the effective removal of toxic CV dye.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Ankush Majumdar, Utpal Ghosh, Anjali Pal
Summary: A 2D-Bi4NbO8Cl nanosheet (BNOCF) photocatalyst was fabricated using a molten salt or flux method and exhibited a higher degradation efficiency towards tetracycline (TCH) compared to bulk-Bi4NbO8Cl (BNOCS). The increased efficiency was attributed to the 2D architecture of BNOCF, which provided a larger surface area and reduced charge recombination rate.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Engineering, Environmental
Ankurita Nath, Subhadeep Biswas, Anjali Pal
Summary: Continuous release of synthetic organic pollutants in the ecosystem, such as Bisphenol A (BPA), poses a global concern due to their toxicity and persistent nature. This review focuses on the investigation of heterogeneous catalysts used for the degradation of BPA through Fenton-like reactions, which are commonly employed for wastewater remediation. The review documents the application of various Fenton catalysts, their morphological characteristics, oxidizing properties, toxicity analysis, and the current state of BPA degradation. Challenges and prospects for analyzing degradation products of landfill leachate are also highlighted.
WATER SCIENCE AND TECHNOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Utpal Ghosh, Anjali Pal, Tarasankar Pal
Summary: In recent years, there has been great interest in near-infrared (NIR) active photocatalysts for their ability to harvest solar NIR energy. However, the quick energy relaxation of plasmon-generated hot electrons hinders their application in photocatalysis. This review summarizes the recent progress in plasmon-induced NIR active photocatalysis and discusses the drawbacks, solutions, and potential of non-noble metal plasmonic photocatalysis.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Ankurita Nath, Subhadeep Biswas, Preeti Pal, Anjali Pal
Summary: In this study, chitosan hydrogel beads and surfactant-modified chitosan hydrogel beads were used to remove Cu(II) ions from aqueous solutions, and the waste beads loaded with Cu(II) ions were used as catalysts for the reduction of 4-nitrophenol. The results showed that the surfactant-modified beads exhibited superior catalytic performance compared to the normal beads.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Imon Kalyan, Subhadeep Biswas, Tarasankar Pal, Anjali Pal
Summary: This study prepared zero valent arsenic nanoparticles in two different size ranges and used them to synthesize silver nanoparticles. The prepared nanoparticles were immobilized onto surfactant-modified silica and used as catalysts for the reduction of 4-nitrophenol. The homogeneous catalysts were found to be more efficient than the supported catalysts. In addition, smaller sized nanoparticles showed higher reaction rates in both homogeneous and heterogeneous catalytic reactions.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Subhadeep Biswas, Anjali Pal
Summary: This study demonstrates a novel protocol for the treatment of dye wastewater and selective extraction of desired dye using biopolymer composite hydrogel beads. The application of biopolymers for wastewater treatment and resource recovery from the waste stream is of great significance. The results also show that the biopolymer composite beads exhibit good reusability and high recovery rate in real wastewater.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Ankurita Nath, Subhadeep Biswas, Anjali Pal
Summary: In this study, eggshell powder (ESP) was used as a selective heterogeneous catalyst for the oxidative degradation of crystal violet (CV) dye in aqueous media. ESP acted as a carbonate (CO32) source, facilitating the formation of carbonate anion radicals (CO3 (center dot-)) in the presence of H2O2. The combination of these radicals and center dot OH radicals led to the selective degradation of CV dye. The use of ESP as a catalyst offers a promising route for CV degradation and the utilization of eggshell waste.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Review
Environmental Sciences
Vajinder Kumar, Arnab Maity, Avneesh Kumar, Sandip Saha, Paul Kay, Baljinder Singh, Tirtha Mukherjee
Summary: The presence of uranium and arsenic pollutants in groundwater can have a terrible impact on people's health and their economic conditions. This review aims to address the chemical mobilization of these hazardous chemicals and provide a hypothetical model and chemical flowcharts to better understand the problems and alleviate their effects. It emphasizes the value of understanding groundwater management through a multidisciplinary and interdepartmental approach.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Plant Sciences
Singh Ravinderdeep Brar, Kumar Avneesh, Kaur Simranjeet, Saha Sandip, Kumar Anuj, Kumar Sandeep
Summary: The review discusses how metal or metal oxide nanoparticles can significantly impact cotton fiber growth and production by entering various parts of the cotton plant. This approach has led to improved cotton yields through influencing different growth-promoting factors in cotton plants.
JOURNAL OF COTTON RESEARCH
(2021)
Article
Engineering, Environmental
Utpal Ghosh, Ankush Majumdar, Anjali Pal
Summary: The potential of graphitic carbon nitride in the photocatalytic reduction of CO2 has been extensively explored, with heterostructure fabrication being the most efficient method for improving charge carrier separation efficiency. This review summarizes recent progress and design considerations of graphitic carbon nitride based heterostructures for CO2 reduction, highlighting the unique characteristics and potential applications in enhancing CO2 adsorption and activation efficacy.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)