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Teng B, Wu J, Zhong Y, Wang Y, Qiao D, Quan R, Zhou Z, Cai L, Qi P, Luo Z, Zhang X. Innovative Utilization of Citrus Sinensis Peel Hydrogels: Enhancing Soil Water Retention and Efficient Removal of Methylene Blue from Wastewater. Polymers (Basel) 2025; 17:428. [PMID: 39940630 PMCID: PMC11819691 DOI: 10.3390/polym17030428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2025] [Revised: 01/30/2025] [Accepted: 02/04/2025] [Indexed: 02/16/2025] Open
Abstract
In the context of increasing water scarcity and environmental pollution, this study investigates the synthesis and application of p(AA-Oco-AAm)-g-Citrus Sinensis Peel hydrogel (CSP hydrogel) to enhance soil water retention and remove organic dyes from wastewater. Hydrogels were prepared using a combination of acrylamide and acrylic acid, with the incorporation of citrus peel as a natural resource. The water absorption capacity of the hydrogels was evaluated, achieving a maximum retention rate of 477 g/g, significantly improving the water-holding ability of various soil types. Additionally, the hydrogels demonstrated a strong affinity for methylene blue, with an equilibrium adsorption capacity reaching 2299.45 mg/g, indicating their effectiveness in wastewater treatment. Kinetic and isothermal adsorption models were applied to analyze the adsorption dynamics, revealing a superior fit to the Langmuir model. The hydrogels maintained structural integrity and reusability over multiple cycles, underscoring their potential for sustainable agricultural practices and environmental remediation. This research highlights the dual benefits of utilizing agricultural waste for the development of eco-friendly materials while addressing critical challenges in water management and pollution control.
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Affiliation(s)
- Bingqin Teng
- College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070, China; (B.T.); (Y.W.); (D.Q.); (R.Q.); (Z.Z.); (L.C.); (P.Q.); (Z.L.); (X.Z.)
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
| | - Jun Wu
- College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070, China; (B.T.); (Y.W.); (D.Q.); (R.Q.); (Z.Z.); (L.C.); (P.Q.); (Z.L.); (X.Z.)
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
- China Gansu Water-Saving Agricultural Engineering and Technology Research Center, Lanzhou 730070, China
| | - Yuan Zhong
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
| | - Yinhua Wang
- College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070, China; (B.T.); (Y.W.); (D.Q.); (R.Q.); (Z.Z.); (L.C.); (P.Q.); (Z.L.); (X.Z.)
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
| | - Decheng Qiao
- College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070, China; (B.T.); (Y.W.); (D.Q.); (R.Q.); (Z.Z.); (L.C.); (P.Q.); (Z.L.); (X.Z.)
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
| | - Runqi Quan
- College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070, China; (B.T.); (Y.W.); (D.Q.); (R.Q.); (Z.Z.); (L.C.); (P.Q.); (Z.L.); (X.Z.)
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
| | - Zhengqian Zhou
- College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070, China; (B.T.); (Y.W.); (D.Q.); (R.Q.); (Z.Z.); (L.C.); (P.Q.); (Z.L.); (X.Z.)
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
| | - Liqun Cai
- College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070, China; (B.T.); (Y.W.); (D.Q.); (R.Q.); (Z.Z.); (L.C.); (P.Q.); (Z.L.); (X.Z.)
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
- China Gansu Water-Saving Agricultural Engineering and Technology Research Center, Lanzhou 730070, China
| | - Peng Qi
- College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070, China; (B.T.); (Y.W.); (D.Q.); (R.Q.); (Z.Z.); (L.C.); (P.Q.); (Z.L.); (X.Z.)
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
- China Gansu Water-Saving Agricultural Engineering and Technology Research Center, Lanzhou 730070, China
| | - Zhuzhu Luo
- College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070, China; (B.T.); (Y.W.); (D.Q.); (R.Q.); (Z.Z.); (L.C.); (P.Q.); (Z.L.); (X.Z.)
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
| | - Xiaodong Zhang
- College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070, China; (B.T.); (Y.W.); (D.Q.); (R.Q.); (Z.Z.); (L.C.); (P.Q.); (Z.L.); (X.Z.)
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Patel U, Parmar B, Singh M, Dadhania A, Suresh E. A mechanochemically synthesized Schiff-base engineered 2D mixed-linker MOF for CO 2 capture and cationic dye removal. Dalton Trans 2024; 53:11165-11176. [PMID: 38895998 DOI: 10.1039/d4dt00661e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/21/2024]
Abstract
Developing synthetic strategies for smart materials for the adsorption and separation of toxic chemicals is of great importance. Metal-organic frameworks (MOFs) have been proven to be outstanding adsorbent materials that possess excellent pollutant removal performances in wastewater treatment, including dye recycling. In this work, a neutral Cd(II) based 2D framework with a dual ligand strategy involving -OH functionalized 5-hydroxyisophthalic acid (5-OH-H2IPA) and the amide decorated Schiff base ligand (E)-N'-(pyridin-4-ylmethylene)isonicotinohydrazide (L) has been synthesized by different synthetic routes and characterized by various analytical methods. Thus, crystals of {[Cd(5-OH-IPA)(L)]·CH3OH}n synthesized via diffusion (ADES-7D) and the phase pure bulk product synthesized by conventional reflux (ADES-7C) and the mechanochemical grinding method (ADES-7M) have been established using PXRD data of the respective product showing identical simulated SXRD data to those of ADES-7D. The mechanochemically synthesized ADES-7M possesses a better surface area and CO2 adsorption capability compared to ADES-7C, which is also supported by electron microscopy and particle size measurements. Furthermore, ADES-7 can be used as an efficient adsorbent material for the reversible, selective adsorption (42-99%) and separation of the cationic dyes malachite green (MG), methyl violet (MV), methylene blue (MB), and rhodamine B (RhB) from the mixture of cationic/anionic dyes (methyl orange (MO) and bromocresol green (BCG)) in the aqueous phase. Specifically, ADES-7M possesses better dye capture capability compared to ADES-7C, even in the case of the bigger dye RhB with adsorption differences of 2.38 to 1.01 mg g-1, respectively. The dye adsorption kinetics follows pseudo-second-order kinetics, and the dye adsorption isotherm fits well with the Langmuir/Freundlich adsorption isotherm models. The probable mechanism of adsorption involving the supramolecular interaction between the host MOF and the guest dye has also been proposed.
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Affiliation(s)
- Unnati Patel
- Department of Chemical Sciences, P. D. Patel Institute of Applied Sciences, Charotar University of Science and Technology (CHARUSAT), Changa-388 421, Gujarat, India.
| | - Bhavesh Parmar
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
| | - Manpreet Singh
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
| | - Abhishek Dadhania
- Department of Chemical Sciences, P. D. Patel Institute of Applied Sciences, Charotar University of Science and Technology (CHARUSAT), Changa-388 421, Gujarat, India.
| | - Eringathodi Suresh
- Analytical and Environmental Science Division and Centralized Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar-364 002, Gujarat, India.
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Yadav S, Gupta R. Hydration of Nitriles Catalyzed by Ruthenium Complexes: Role of Dihydrogen Bonding Interactions in Promoting Base-Free Catalysis. Inorg Chem 2022; 61:15463-15474. [PMID: 36137300 DOI: 10.1021/acs.inorgchem.2c02058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ru(II) complexes of amide-phosphine-based tridentate ligands additionally containing pyridine, isoquinoline, and quinoline rings have been synthesized, and their catalytic utility for the selective hydration of nitriles to amides is explored under the base-containing as well as base-free conditions. The chloride-ligated complexes 1-3 exhibited significant catalytic activity in the presence of a base, whereas hydride-ligated complexes 4-6 carried out the hydration of nitrile without the requirement of any base. The mechanistic studies revealed the involvement of [Ru-H] species as the active catalyst in the catalytic cycle. The [Ru-H] species assisted in the polarization of an incoming water molecule through [Ru-H···H-OH] dihydrogen bonding interaction and consequently aided in the attack of a positioned water molecule to a nitrile coordinated to a ruthenium center. Substrate binding studies and kinetic experiments further supported the mechanism. A wide variety of aromatic nitriles containing both electron-withdrawing and electron-releasing groups as well as other substrates including aliphatic nitriles, base-sensitive nitriles, and a few biologically relevant nitriles were employed for the selective hydration.
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Affiliation(s)
- Samanta Yadav
- Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Rajeev Gupta
- Department of Chemistry, University of Delhi, Delhi 110007, India
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Gupta R, Kumar G, Gupta R. Encapsulation-Led Adsorption of Neutral Dyes and Complete Photodegradation of Cationic Dyes and Antipsychotic Drugs by Lanthanide-Based Macrocycles. Inorg Chem 2022; 61:7682-7699. [PMID: 35543424 DOI: 10.1021/acs.inorgchem.2c00688] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Molecular architectures offering large cavities can accommodate guest molecules, while their compositional engineering allows tunability of the band gap to support photocatalysis using visible light. In this work, two lanthanide (Ln)-based macrocycles, synthesized using a cobalt-based metalloligand and offering large rectangular cavities, exhibited selective adsorption of neutral dyes over both anionic and cationic dyes. Both Ln macrocycles illustrated complete photodegradation of cationic dyes using visible light without the use of any oxidant. Both Ln macrocycles exhibited complete photodegradation of not only cationic dyes but also a few phenothiazine-based antipsychotic drugs. Photocatalysis involved the generation of reactive oxygen species (ROS), which was corroborated with the band gap of two Ln macrocycles. These results were supported by radical scavenger studies and the quantitative estimation of superoxide and hydroxyl radicals. Complete photodegradation of both dyes and drugs was confirmed by spectral studies, while the generation of CO2 and N2 gases was established by gas chromatography. Importantly, Ln macrocycles were able to distinguish between the neutral dyes that were quantitatively adsorbed and the cationic dyes/drugs that were completely photodegraded.
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Affiliation(s)
- Ruchika Gupta
- Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Gulshan Kumar
- Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Rajeev Gupta
- Department of Chemistry, University of Delhi, Delhi 110007, India
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Goyal H, Gupta R. Sensing and formation of a stable gel in the presence of picric acid by a low-molecular-weight-gelator. J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2022.100521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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