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Boosting the adsorption and removal of dye from water by COOH-functionalized carbon nanotubes

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Green Chemical Engineering 2023年第1期4卷 88-98页

作者： Binran Zhao Yiyi Zhao Peng Liu Yu-Long Men Yun-Xiang Pan School of Chemical Engineering Northwest UniversityXi'an710069China Department of Chemical Engineering School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai200240China

Water pollution caused by dye is a serious challenge.Herein,we use a novel discharge process to functionalize carbon nanotube(CNT)by COOH groups to form CNT30 for removing methyl red(MR)from water.By pristine CNT,75%MR is removed in 60 min,with an adsorption capacity of 68.44 mg g-1.By CNT30,85%MR is fast removed in only 5 min,and the removal efficiency reaches to 95%after 30 min,with an adsorption capacity of80.33 mg g-1.Thus,a higher MR removal efficiency is achieved in a much shorter time on CNT30.Moreover,CNT30 has an outstanding reusability,with the MR removal efficiency decreasing by only 7%after ten cycles.The COOH groups on CNT30 improve the hydrophilicity of CNT30,thus promoting the interaction of MR in water with CNT30.The hydrogen bonding and electrostatic interaction of MR with the COOH groups on CNT30 could be the force to drive MR adsorption on CNT30.The higher COOH content could be the origin for the better performance of CNT30 in removing dye from water.The discharge process developed herein is operated in O2,without using harmful substances,and the COOH content on CNT can be efficiently tuned by simply changing discharge time.This is different from the chemical modification widely used to functionalize CNT by strong oxidants,e.g.,HNO_(3).The present work is of great significance to realize green construction of materials for more efficiently removing dye from water.

关键词： Carbon nanotube Oxygen-containing functional group dye Water pollution Discharge process

Facile fabrication of the porous adsorbent from natural plant Angelica Sinensis stabilized liquid foam for dye removal

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Green Chemical Engineering 2022年第1期3卷 83-91页

作者： Fangzhi Duan Yongfeng Zhu Hui Yu Aiqin Wang Key Laboratory of Clay Mineral Applied Research of Gansu Province Center of Eco-material and Green ChemistryLanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China Certer of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China

Porous materials as emerging high-efficiency adsorbents have attracted increasing attention in recent years,due to the high specific surface area,fast adsorption rate,favorable adsorption capacity to heavy metal,dyes,and other pollutants,etc.Among various approaches,the foam template method with the advantage of flexible operation and controllable pores structure is proposed to prepare net type of porous adsorbents with superior adsorption capacity and rapid adsorption rate.In this process,natural plant Angelica Sinensis(AS)was treated with a simple alkalineheat process,and the resultant product was used firstly to prepare foam with high stability,and the positive effect of the cellulose dissociation and the conversion of ligustilide into amphiphilic moleculars on improving the stability of Pickering foam was revealed.The liquid foam can serve as pore-foaming template and precursor of polymerization for synthesizing porous adsorbent by one-step integrated process of free radical polymerization and silane hydrolysis.The porous adsorbent showed the sufficient porous structure and excellent adsorption performance for cationic dye,with maximum adsorption capacities of 386.13 mg g^(-1) and 284.20 mg g^(-1) for methyl violet(MV)and malachite green(MG).In a word,the novel approach can provide an important reference for green synthesis of high stable foam and the superporous material,and the adsorbent showed great application potential in the field of water treatment.

关键词： Adsorbent Angelica Sinensis Pickering foam Adsorption dye

Nanostructured self-assemblies of photosensitive dyes: green and efficient theranostic approaches

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Green Chemical Engineering 2023年第4期4卷 399-416页

作者： Hao Liu Xue-Yan Li Xingshu Li Jian-Dong Huang College of Chemistry State Key Laboratory of Photocatalysis on Energy and EnvironmentFujian Provincial Key Laboratory of Cancer Metastasis Chemoprevention and ChemotherapyFuzhou UniversityFuzhou350108China

Recently,nano theranostics,by integrating diagnostic and therapeutic functions into a nano system,have provided increasing opportunities for the design of personalized medicine in cancer.Among the construction method of various theranostic nano systems,the design of single component nanoparticles which are composed of organic photosensitive dyes has become a promising approach to constructing multifunctional nano-theranostic systems,thanks to its unique advantages such as defined structure,100%loading,and high repeatability.Specifically,depending on the inherent photonic imaging and therapeutic properties of the photosensitive dyes,the multifunctional purpose which integrates theranostic effects and targeting abilities can be realized via reasonable molecular modification and supramolecular assembly.In this review,recent advances in the development of nanostructured self-assemblies of porphyrins,phthalocyanines,and boron-dipyrromethanes for theranostics are summarized.Emphasis on their design consideration and theranostic applications are presented.Additionally,prospects for clinical practice and potential challenges of this rapidly growing field are also provided.

关键词： Theranostic dye Photosensitizer Multifunctional nanoparticle Self-assembly

In-situ constructing visible light CdS/Cd-MOF photocatalyst with enhanced photodegradation of methylene blue

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Particuology 2022年第10期20卷 111-122页

作者： Cheng Jing Yufei Zhang Junjie Zheng Shengsong Ge Jing Lin Duo Pan Nithesh Naik Zhanhu Guo College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao 266590China School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Department of Mechanical&Manufacturing Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipal 576104KarnatakaIndia Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA Taiyuan University of Science and Technology Taiyuan 030024China

Based on high specific surface area,high porosity of metal-organic frameworks(MOFs)and excellent vis-ible light response of CdS,the CdS/Cd-MOF nanocomposites were constructed by in-situ sulfurization to form CdS using Cd-MOF as precursor and the CdS loading was controlled by the dose of thioac-etamide.Under the irradiation of simulated sunlight,the degradation rate of methylene blue(MB)by 10mg MOF/CdS-6(mass ratio of MOF to thioacetamide is 6:1)was 91.9%in 100min,which was higher than that of pure Cd-MOF(62.3%)and pure CdS(67.5%).This is attributed to the larger specific surface area of the composite catalysts,which provides more active sites.Meanwhile,the loading of CdS obvi-ously broadens the light response range of Cd-MOF and improves the utilization of visible light.The Mott-Schottky model experiment shows that the formed type-Ⅱheterojunction between Cd-MOF and CdS can effectively inhibit the recombination of photogenerated electrons and holes.Meanwhile,the photocurrent intensity of MOF/CdS-6 is 8 times and 2.5 times of that of pure Cd-MOF and CdS.In addi-tion,MOF/CdS-6 showed good photocatalytic performance after five cycles,showing excellent stability and reusability.

关键词： MOFCdS Photocatalytic activity Visible light Heterojunction dye

Insights into remediation technology for malachite green wastewater treatment

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Water Science and Engineering 2023年第3期16卷 261-270页

作者： Peter Olusakin Oladoye Timothy Oladiran Ajiboye Wycliffe Chisutia Wanyonyi Elizabeth Oyinkansola Omotola Mayowa Ezekiel Oladipo Department of Chemistry and Biochemistry Florida International UniversityMiami 33199USA Analytical/Environmental Chemistry Unit Department of Pure and Applied ChemistryLadoke Akintola University of TechnologyOgbomoso 210214Nigeria Department of Chemistry Nelson Mandela UniversitySummerstrand 6031South Africa Material Science Innovation and Modelling(MaSIM)Research Focus Area Faculty of Natural and Agricultural SciencesNorth-West UniversityMmabatho 2735South Africa Department of Mathematics Actuarial and Physical SciencesSchool of Science and TechnologyUniversity of KabiangaKericho 20201Kenya Department of Chemical Sciences Tai Solarin University of EducationIjebu Ode 120101Nigeria

Malachite green (MG) dye is a common industrial dye and organic contaminant that can be found in (waste)water. Textile and food industries make use of MG as dyeing and food coloring agents, respectively. However, MG is both genotoxic and mutagenic. Hence, the elimination of MG from MG-laden-wastewater is germane. This review summarizes up-to-date researches that have been reported in literature as regards the decontamination of toxic MG wastewater. Various removal methods (adsorption, membrane, Fenton system, and heterogenous and homogeneous photodegradation) were discussed. Of the two basic technologies that are comprehensively explored and reviewed, chemical treatment methods are not as viable as physical removal methods, such as the adsorption technology, due to the lack of secondary pollutant production, simple design, low operation costs, and resource availability. This review also presents various practical knowledge gaps needed for large-scale applications of adsorptive removal methods for MG. It concludes by recommending further research on the techniques of cheap and simple decontamination of MG to get clean water.

关键词： Contaminant Wastewater Decontamination Pollution Malachite green dye

Coal fy ash:an emerging material for water remediation

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International Journal of Coal Science & Technology 2022年第3期9卷 18-49页

作者： N.B.Singh Anupam Agarwal Anindita De Pragya Singh Department of Chemistry and Biochemistry Sharda UniversityGreater NoidaIndia

Coal fy ash(CFA)is a byproduct of thermal power plant and collected from fue gases by separator.Composition of CFA depends on the type of coal used and it has both crystalline and amorphous character.It is considered to be an environmental pollutant and used in number of areas.CFA is a useful material and widely used in cement production and as a promising adsorbent for water remediation.CFA used for remediation of wastewater solves problems related to water quality issues and waste management.The physical properties such as porosity,surface area,morphology,and chemical composition(iron oxide,alumina,silica,titania,etc.)make CFA efcient material for wastewater treatment.CFA is also converted to geopolymer,which is used as an adsorbent and photocatalyst.dye,organic compounds,toxic heavy metal ions,etc.have been removed using CFA and modifed CFA adsorbents.Diferent adsorption efciencies have been reported for diferent adsorbate and CFA adsorbents.Numbers of adsorption isotherm and kinetic models have been discussed.

关键词： Coal fy ash Adsorbent dye Geopolymer Water remediation Pollutants

Synergistic interaction of three-dimensional ZnCdS@MoS2 heterostructures for high-efficiency visible-light photocatalytic degradation of dyes

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Progress in Natural Science:Materials International 2023年第4期33卷 442-449页

作者： Yingjiao Zhai Haowen He Mingze Xu Hongbin Zhao Jinhua Li Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing Nanophotonics and Biophotonics Key Laboratory of Jilin Province State Key Laboratory of High Power Semiconductor Lasers Changchun University of Science and Technology State Key Laboratory of Advanced Materials for Smart Sensing General Research Institute for Nonferrous Metals

High-performance photocatalysts should urgently be developed to efficiently solve serious environmental problems. Herein, we successfully synthesized a novel, visible-light activated, three-dimensional ZnCdS@MoS2photocatalyst using a simple, two-step hydrothermal process. Based on reaction time-dependence, the growth mechanism of “oriented attachment” of the ZnCdS@MoS2heterostructure is described in detail. The photodegradation of methylene blue(MB) indicated that the prepared sample has an outstanding photocatalytic activity owing to the accelerated photogenerated electron production rate, inhibited electron–hole pair recombination,improved visible light–utilization rate, and increased specific surface area. According to our experimental results,the degradation rate of MB using the ZnCdS@MoS2nanocomposite was as high as 99.3% after 100 min of visible-light irradiation. The photocatalyst remained stable without any obvious decrease in activity even after three cycles of use. This study provides a strong support for the design of high-performance photocatalysts and their application in optoelectronic devices.

关键词： dye Heterostructure Photocatalytic Visible-light ZnCdS@MoS2

A Double Layer Laminated Film of Cellulose Nanocrystals and dye Displaying Vibrant Circularly Polarized Light

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Chemical Research in Chinese Universities 2022年第1期38卷 45-49页

作者： WEI Lihong MA Xiaoting XU Yan State Key Laboratory of Inorganic Synthesis&Preparative Chemistry Jilin UniversityChangchun 130012P.R.China College of Chemistry Jilin UniversityChangchun 130012P.R.China

Circularly polarized(CP)light is a circularly polarized electromagnetic wave and is of significance for applications,such as information storage and encryption,3D display and sensing due to its unique optical properties including optical information storage capacity and chiral specificity11-61.In order to produce circularly polarized light,chirality and light including spontaneous luminescence and incident light are necessary.

关键词： Cellulose nanocrystal dye Tunable circularly polarized light Selective reflection Light absorption

dyes adsorption using a synthetic carboxymethyl cellulose-acrylic acid adsorbent

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Journal of Environmental Sciences 2014年第5期26卷 1203-1211页

作者： Genlin Zhang Lijuan Yi Hui Deng Ping Sun School of Chemistry and Chemical Engineering Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Shihezi University

Removal of noxious dyes is gaining public and technological attention. Herein grafting polymerization was employed to produce a novel adsorbent using acrylic acid and carboxymethyl cellulose for dye removal. Scanning electron microscopy and Fourier-transform infrared spectroscopy verified the adsorbent formed under optimized reaction conditions. The removal ratio of adsorbent to Methyl Orange, Disperse Blue 2BLN and malachite green chloride reached to 84.2%, 79.6% and 99.9%, respectively. The greater agreement between the calculated and experimental results suggested that pseudo second-order kinetic model better represents the kinetic adsorption data. Equilibrium adsorptions of dyes were better explained by the Temkin isotherm. The results implied that this new cellulose-based absorbent had the universaiity for removal of dyes through the chemical adsorption mechanism.

关键词： adsorption dye grafting polymerization carboxymethyl cellulose acrylic acid