ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 3
·6544-6558
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IF 5.19
Gao Jianlei,Feng Mengyuan,Yan Yixin,Zhao Zixu,Wang Yingchun
In this research, a new composite adsorbent (SC@ZVI@CS-AA) was designed and synthesized, and its application for the removal of Cr(VI) in groundwater was investigated. The interaction between SC@ZVI@CS-AA and Cr(VI) conformed to a pseudo-second-order model, and the adsorption process was dominated by chemisorption. The effects of material ratios, pH, temperature, SC@ZVI@CS-AA dosage, and coexisting ions on the removal of Cr(VI) were investigated. The removal efficiency of Cr(VI) by SC@ZVI@CS-AA reached 95%, and the reaction was significantly inhibited when SO 4 2− was present. Thermodynamically, the adsorption of Cr(VI) proceeded spontaneously above 35 °C ( ΔG θ < 0). According to scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectrometry, and synchronous thermal analysis, the removal mechanism of Cr(VI) by SC@ZVI@CS-AA was attributed to electrostatic attraction and reduction. In addition, SC@ZVI@CS-AA had good cyclic adsorption performance. Overall, the SC@ZVI@CS-AA composite showed great potential in the remediation of Cr(VI)-contaminated groundwater.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yaqian Feng,Ruxue Li,Peng Zhou,Chunying Duan
A novel fluorescence carbon dots (CS-CDs) were prepared via a one-step hydrothermal approach using chitosan and urea as precursors. CS-CDs exhibited good selectivity and sensitivity of fluorescence response to Cr (VI) in a wide range with a detection limit of 0.59 μM. More interestingly, CS-CDs-based fluorescent hydrogel sensors were further developed for quantitative detection of Cr (VI) in water. The fluorescence signals of the composite were recorded by a smartphone and converted to grayscale parameters linearly related to concentration of Cr (VI) by Image J software. This composite showed a broad linear range of 10–300 μM and a low detection limit of 2.83 μM. All results demonstrate the great potential for the portable, low-cost and green detection of Cr (VI) in practical application.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Huizhen Shen,Li Chen,Cailong Zhou,Jingcheng Du,Chenyang Lu,Hao Yang,Luxi Tan,Xinjuan Zeng,Lichun Dong
Nanoscale zero-valent iron (NZVI, Fe 0 ) has been widely used for reduction of strong toxic Cr(VI) to low toxic Cr(III), however, given the easy aggregation of NZVI, developing new substrate support for NZVI is highly desirable. In this study, via a simple in-situ growth method, NZVI was immobilized on porous TpPa-1 covalent organic frameworks (COFs), making it an effective adsorbent for adsorption and reduction of Cr(VI) from aqueous solution. Meanwhile, to make the composite of NZVI and COFs a uniform system, dopamine (DOPA) was used as a connector to combine them. The COFs with porous crystal structure provides controlled anchors for Fe 0 loading as well as the reaction sites. Results verify that the Fe 0 / [email protected] exhibited an excellent performance in Cr(VI) removal due to synergistic effect of the composite, with the maximum removal capacity up to 516 mg/g. Furthermore, it maintained high removal capacity under acidic, neutral and alkaline environments. Therefore, the Fe 0 / [email protected] is a promising material for Cr(VI) removal from wastewater in practical application.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Hai-Tao Ren,Meng-Zhen Jing,Da-Shuai Li,Ting-Ting Li,Ching-Wen Lou,Jia-Horng Lin,Xu Han
Photocatalytic reduction of Cr(VI) in water environments attracts more attention; however, the mechanisms involved in this process have not been clearly elucidated yet. In this study, the photocatalytic reduction of Cr(VI) by polydopamine modified Bi 2.15 WO 6 (PDA/BWO) under visible light was conducted. Kinetics results show that PDA apparently accelerates the reduction of Cr(VI). The quasi-first-order kinetic constant of Cr(VI) reduction by 5PDA/BWO is 70.0 times that of the original BWO, reaching 0.070 min −1 . X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy , and Raman analyses confirm the formation of ligand-to-metal charge transfer (LMCT) complex [Bi(III) O C] between PDA and BWO. The formed Bi(III) O C complex enhances visible light response and narrows the bandgap of PDA/BWO. The photoelectrochemical and photoluminescent characterization further reveals that the formed Bi(III) O C complex inhibits the recombination of carriers, thus enhancing the photocatalytic reactivity of PDA/BWO. Electrons, are derived from three paths, including dye sensitization, LMCT and bandgap excitation, contribute to Cr(VI) reduction by PDA/BWO. This study provides new insights on the paths of Cr(VI) reduction by PDA/BWO under visible light.
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ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Jianhua Qu,Yang Liu,Jiao Meng,Fuxuan Bi,Shouyi Ma,Guangshan Zhang,Yifan Wang,Yue Tao,Zhao Jiang,Ying Zhang
Herein, magnetic porous pinecone-derived hydrochar (MPHC MW ) co-activated by KHCO 3 and K 2 FeO 4 through one-step microwave-assisted pyrolysis was innovatively synthesized for hexavalent chromium (Cr(VI)) and anthracene (ANT) removal from water. The analyses of characterization consequences and co-activation mechanisms not merely proved the high specific surface area (703.97 m 2 /g) and remarkable microporous structures of MPHC MW caused by the synergistic chemical activation of KHCO 3 and K 2 FeO 4 , but also testified successful loading of Fe 0 and Fe 3 O 4 on MPHC MW by the process of carbothermal reduction between K 2 FeO 4 and carbon matrix of hydrochar. The resultant MPHC MW possessed pH-dependence for Cr(VI), while adsorption for ANT was hardly impacted by the pH of solution. Moreover, the adsorption processes of MPHC MW could attain equilibrium within 60 min for Cr(VI) and 30 min for ANT with multiple kinetics, and the corresponding adsorption capacity for Cr(VI) and ANT was 128.15 and 60.70 mg/g, respectively. Additionally, the adsorption percentages of MPBC MW for Cr(VI)/ANT was maintained at 87.87/82.64% after three times of adsorption-desorption cycles. Furthermore, pore filling, complexation, electrostatic interaction, reduction and ion exchange were testified to enhance the removal of Cr(VI), while the ANT removal was achieved via π-π stacking, complexation, pore filling and hydrogen bonding force.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 47
·72058-72073
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IF 5.19
Gao Jingqing,Liu Xiaobang,Ren Peng,Gao Jianlei,Chen Yong,Chen Zhijun
The novel iron-based reductive particles, functionalized with amino and carboxylic functional groups, were synthesized to remove Cr(VI) and Cd(II) ions from aqueous solutions. The morphological structure and surface functional groups of new composites were characterized with SEM, XRD, FTIR, BET, and other techniques. The influence of pH, initial concentration, adsorbent dosing, and temperature on removal efficiencies were explored by batch experiments. The adsorption capacity of Cr(VI) and Cd(II) increased by 159.95% and 76.60%, respectively, compared with Fe 0 , reaching 47.638 and 62.047 mg/g. EDS and XPS analysis showed most of Cr(VI) was reduced to Cr(III) and precipitated as ferrochrome oxide, and Cd(II) was mainly precipitated as hydroxide. Reduction-precipitation and complexation may predominate in the removal process of Cr(VI), which fitted well with Langmuir and Freundlich models and pseudo-second-order kinetics. While hydrolysis and complexation may prevail for Cd(II), which was suited with Langmuir model and pseudo-second-order kinetics. Having good magnetic properties, the A/C-Fe@SiO 2 particles exhibited excellent reusable stability after four times regeneration experiments, promising a prospect for in-situ remediations of groundwater contaminated by Cr(VI) and Cd(II).
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POLYMER BULLETIN
·
2022
·Vol. 80
·期 2
·2099-2118
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IF 2.843
Liu Xiaoqi,Zhang Yanyun,Liu Yan,Zhang Ting′an
Magnetic red mud/chitosan (MRM/CS) based bionanocomposites were prepared by the neutralization method, and this method had the advantages of simplicity, low-cost and eco-friendly. The adsorbents were characterized by XRD, FTIR and VSM analysis. The effects of various parameters, such as RM addition amounts, pH, concentration, temperature, time and co-existing metal ions, on the adsorption of Cr(VI) were studied. Moreover, adsorption kinetic, isotherm and thermodynamic of the Cr(VI) adsorption were analyzed. The results show that the MRM/CS composite has good recoverability (8.56 emu·g −1 ) and adsorption performance (7.79 mg·g −1 , 303 K, pH = 3). The process of the adsorption reaction conforms to the Langmuir model and the pseudo-second-order kinetic model, suggesting that the adsorption of Cr(VI) ions on the surface of CS-based adsorbents are monolayer adsorption and chemisorption. Thermodynamic study reveals that the adsorption is spontaneous and endothermic.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Tianwu Hu,Lifan Zeng,Yaqin Li,Yajing Wu,Zece Zhu,Yanbo Zhang,Di Tian,Chao Gao,Wei Li
A novel terylene carbon dots (TCDs) were successfully synthesized by a one-step solvothermal method, and further modified onto chitosan non-woven fabrics (CNF) for selective detection and effective removal of Cr(VI). Compared with TCDs, chitosan non-woven fabrics modified by carbon dots (CNF-TCDs3) exhibited higher selectivity and lower detection limit for Cr(VI) (The limit of detection (LOD) is 0.15 mg/L). In addition, CNF-TCDs3 showed a rapid and effective removal of Cr(VI), and still maintain a high relative removal rate (above 92%) after five times recirculation. The adsorption equilibrium could be reached in only 8 min, and the maximum adsorption capacity was 203 mg/g. The adsorption process conformed to the Langmuir model, and the fitting correlation is R 2 = 0.99. The fluorescence response and efficient adsorption mechanisms of the CNF-TCDs3 toward Cr(VI) were mainly attributed to the internal filtering effect and the amino and hydroxyl groups in chitosan. Significantly, this functionalized fabrics CNF-TCDs3 were successfully applied to semi-quantitatively detect on a smartphone-integrated-device and efficiently remove Cr(VI) in real samples.
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Small
·
2024
·
IF 13
Suyue Luo,Zhenzhong Liu,Xinran Yin,Zuopeng Lin,Shuo Zhang,Junfeng Chen,Minghui Guo
The severe deterioration of the marine ecosystem significantly negatively impacts the performance of solar-driven steam generation (SSG) and the quality of the obtained freshwater. Herein, a bifunctional Ag/MgFe 2 O 4 @SCW reactor with a sandwich structure is designed for efficient SSG and Cr(VI) reduction, which is constructed via in situ deposit Ag nanoparticles (NPs) and MgFe 2 O 4 onto surface carbonized wood (SCW). Owing to the advanced sandwich structure and strong interfacial interactions between each component, an ultra-high evaporation rate of 1.55 kg m −2 h −1 and the efficiency of 88.6% are achieved using Ag/MgFe 2 O 4 @SCW under 1 sun. The system exhibits the long-term evaporation performance in the simulated sewage and strong acid/base solutions along with water-harvesting capacity in outdoor solar desalination. The quality of distilled water after desalination of actual seawater and NaCl solutions with different concentrations meets the WHO-recommended drinkable water standards. Furthermore, Ag/MgFe 2 O 4 @SCW shows outstanding antibacterial property, self-desalting capacity, as well as reusability and structure stability. Most importantly, the fast carrier separation endows Ag/MgFe 2 O 4 @SCW with superior photocatalytic activity and Cr(VI) photoreduction of up to 96.1% after 180 min of illumination. The bifunctional Ag/MgFe 2 O 4 @SCW reactor provides an advanced synergistic mechanism for improving SSG and photocatalytic performance, while being promising for solar-powered production of clean water.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Shuai Ding,Yanchen Zhu,Haonan Zhang,Yajun Fu,Hao Ren,Huamin Zhai
Cr (VI) accumulates in an aqueous environment and exhibits huge harm to human health and the ecological system. Developed lignin biomass materials are complicated to prepare and have limited properties, and advances in lignin phenolic modification are lacking. Herein, an aminated poplar lignin-pyrogallol (PLP-PEI) with a simple design and adjustable phenolic hydroxyl content was developed using the acid hydrolysis-phase separation (AH-PS) method, and modified by the atom transfer radical polymerization (ATRP) strategy. Through diverse characterization analysis, the structural changes of PLP-PEI in the step-by-step synthesis process were monitored. An effective biomass capture system (Bio-Cap) was shown via systematically investigating the adsorption behaviors of Cr (VI) on PLP-PEI under various environmental conditions. Benefiting from introducing phenolic hydroxyl and amino groups, PLP-PEI demonstrated efficient adsorption capacity (598.80 mg/g for Cr (VI)). Additionally, the material also exhibited advantages, including monomeric chemisorption properties, strong reduction capability, and stable regeneration properties. Multiple driving forces were involved in the capture and removal process of Cr (VI), including complexation and electrostatic interaction. The low-cost natural biomass resources supported the industrial-scale synthesis and practical application of advanced aminated lignin polyphenol material, which showed outstanding advantages and enormous potential in the field of water environmental restoration.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Peiyuan Xiao,Junqing Xu,Hongliang Shi,Fengyang Du,Huanzheng Du,Guangming Li
The simultaneous reduction of Cr(VI) and sequestration of the resulting Cr(III) in one process is highly desirable as a cost-effective and environmental-friendly approach for the decontamination of Cr(VI)-polluted wastewater. However, most of the existing adsorptive materials are only effective in low pH environments (pH = 1–3), severely restricting the adsorption efficiency and cost effectiveness. Herein, we proposed a chitosan-based magnetic porous microsphere (PPy@PMCS) for simultaneous Cr(VI) reduction and Cr(III) sequestration in a wide pH range. Benefiting from its abundant interaction sites, Cr(VI) was effectively adsorbed on the surface and then immediately reduced to Cr(III) with much lower toxicity. Most importantly, the resulting Cr(III) was in-situ sequestrated by the complexation of chitosan matrix. As a result, PPy@PMCS exhibited a maximum Cr(VI) adsorption capacity of 330.42 mg/g at pH 2.0 and an adsorption capacity of 167.82 mg/g even at near neutral pH (6.0), which is superior to most reported adsorbents. Furthermore, the exhausted PPy@PMCS can be rapidly separated from solutions under an external magnetic field and facilely regenerated. The proposed novel biopolymer-based material shows great application potentials in wastewater treatment.
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RSC Advances
·
2021
·Vol. 11
·期 50
·31795-31806
·
IF 3.361
Run Fang,Bing-Chiuan Shiu,Yuansong Ye,Yuchi Zhang,Hanyu Xue,Ching-Wen Lou,Jia-Horng Lin
In this study, a novel cationic nanofiber membrane with various functional groups, good structural stability, and high adsorption capacity of Cr(VI) is presented. This nanofiber membrane is prepared by electrospinning a mixed aqueous solution of a cationic polycondensate (CP) and polyvinyl alcohol (PVA). With the aid of PVA, CP can be smoothly electrospun without using any organic solvents, and the cross-linking between CP and PVA improves the stability of membrane in acidic solution. Chemical and morphology characterization reveals that the CP/PVA membrane is composed of interwoven nanofibers that contain numerous cationic groups. Due to its high cationicity and hydrophilicity, the CP/PVA membrane shows great affinity for HCr2O7− and Cr2O72−. Adsorption experiments indicate that the CP/PVA membrane can remove Cr(VI) from simulated wastewater rapidly and efficiently in both batch and continuous mode. Besides, the presence of most coexisting ions will not interfere with the adsorption. Due to the redox reaction between the CP/PVA membrane and adsorbed Cr(VI), the CP/PVA membrane exhibits distinct color change after Cr(VI) adsorption and the discoloration is highly dependent on the adsorption amount. Therefore, in addition to serving as a highly efficient adsorbent, the CP/PVA membrane is also expected to be a convenient and low-cost method for semi-quantitative determination of Cr(VI) in wastewater.
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