Selective and Efficient Photoextraction of Aqueous Cr(VI) as a Solid-State Polyhydroxy Cr(V) Complex for Environmental Remediation and Resource Recovery

Yao, Ling; Hu, Yang; Zou, Yingtong; Ji, Zhuoyu; Hu, Shu‐Xian; Wang, Cong; Zhang, Ping; Yang, Hui; Shen, Zewen; Tang, Duoyue; Zhang, Sai; Zhao, Guixia; Wang, Xiangke

doi:10.1021/acs.est.2c03994

Cited by 57 publications

(17 citation statements)

References 49 publications

(95 reference statements)

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“…The affinity of catechol for a particular metal ion is affected by the charge and the coordination number of the ion in the catechol–metal complex. ,− More precisely, the catechol–metal ion complex stability is correlated with the metal ion affinity for the −OH group. ,, The affinity generally increases with increase in charge and the coordination number. ,− , The high selectivity of C–Cat for Ge results from high affinity of catechol for Ge(IV) due to higher charge of Ge(IV) and the 6-co-ordination structure of Ge(IV)-catechol complex, resulting from the 1:3 complex structure. , …”

Section: Resultsmentioning

confidence: 99%

Catechol-Functionalized Chitosan Synthesis and Selective Extraction of Germanium (IV) from Acidic Solutions

Patel

Karamalidis

2023

Ind. Eng. Chem. Res.

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Germanium (Ge) is one of the critical elements that lack an efficient economic recovery process from dilute sources. An improved catechol-based adsorbent, catechol-functionalized chitosan (C–Cat), was synthesized to recover germanium (Ge) from dilute acidic solutions. The adsorbent was also compared with an N-methylglucamine-based commercial adsorbent (Purolite S108) for optimum pH conditions, ion selectivity, adsorption isotherm, adsorption kinetics, and regeneration ability. The newly synthesized C–Cat exhibited higher selectivity against various competing ions than the commercial one (their respective Langmuir capacity was 22.72 and 79.66 mg/g at pH 3) and was more selective for Ge than other adsorbents reported in the literature. Linear free-energy relationships between the distribution coefficients and the metal hydrolysis constants were developed for both C–Cat and S108 at pH 3 and can be used for preliminary prediction of the selectivity of the adsorbents. Adsorptions data followed Langmuir isotherm for both adsorbents, and the kinetics data were well-fitted with pseudo-second-order kinetics. The C–Cat was proven to be completely reusable for multiple cycles after initial re-equilibration.

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Section: Resultsmentioning

confidence: 99%

Catechol-Functionalized Chitosan Synthesis and Selective Extraction of Germanium (IV) from Acidic Solutions

Patel

Karamalidis

2023

Ind. Eng. Chem. Res.

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“…Recently, Yao et al has been reported a new mechanism of photoreduction of Cr(VI) to Cr(V) and the resulted Cr(V) precipitate converted to Cr 2 O 3 through the calcination process. [178,179] Through the utilization of environmental and human mechanical energy, this kind of reductions can be realized based on tribocatalysis. Although, tribocatalysis have advantages over piezocatalysis but still more attention is required in the development of other catalytic applications and short time water treatment based on tribocatalysis.…”

Section: Applications Of Tribocatalysismentioning

confidence: 99%

Emergence of Non‐photoresponsive Catalytic Techniques for Environmental Remediation and Energy Generation

Sharma

Khan

Kaswan

et al. 2023

Chemistry An Asian Journal

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Catalysis plays a crucial role in all the major applications and challenges in the environment, including energy generation and environmental remediation. Although photocatalysts and electrocatalysts are useful in addressing energy and environmental issues, they have some major drawbacks, such as low efficiency and easy charge recombination which limits their applications. Hence, it is imperative to design and explore new catalytic techniques that include non‐photoresponsive catalysts. In this review, the detailed possibilities, characteristics and prospects of non‐photoresponsive catalysts, such as piezocatalysts, thermocatalysts, pyrocatalysts, and tribocatalysts along with hybrid catalysts are described. The overall mechanism of each catalytic technique and its applications in different fields such as energy generation, environmental remediation, and carbon dioxide reduction are discussed.

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“…To assess the performance of the FSL model in chemical analysis, it is necessary to construct a stable chemical sensor to obtain high-quality sample data. With the increasing concern for human health and hydrosphere protection, the toxicity of Cr(VI) as a powerful carcinogenic agent has been widely recognized, and then Cr(VI) is listed as a priority pollutant by many countries, including the USA and China. , Because Cr(III) can be transformed into toxic Cr(VI) by the pathway of photooxidation in natural environments, chromium emission and its content in drinking water and industrial wastewater should be strictly restricted . Therefore, the maximum acceptable concentration for soluble chromium in drinking water is set at 100 μg/L by the United States Environmental Protection Agency (USEPA), and a more strict threshold (50 μg/L) is set by the World Health Organization (WHO) and China.…”

Section: Introductionmentioning

confidence: 99%

Few-Shot Learning-Based, Long-Term Stable, Sensitive Chemosensor for On-Site Colorimetric Detection of Cr(VI)

Huang

Luo

et al. 2023

Anal. Chem.

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The rapid emergence of deep learning, e.g., deep convolutional neural networks (DCNNs) as one-click image analysis with super-resolution, has already revolutionized colorimetric determination. But it is severely limited by its data-hungry nature, which is overcome by combining the generative adversarial network (GAN), i.e., few-shot learning (FSL). Using the same amount of real sample data, i.e., 414 and 447 samples as training and test sets, respectively, the accuracy could be increased from 51.26 to 85.00% because 13,500 antagonistic samples are created and used by GAN as the training set. Meanwhile, the generated image quality with GAN is better than that with the commonly used convolution self-encoder method. The simple and rapid on-site determination of Cr(VI) with 1,5-diphenylcarbazide (DPC)-based test paper is a favorite for environment monitoring but is limited by unstable DPC, poor sensitivity, and narrow linear range. The chromogenic agent of DPC is protected by the blending of polyacrylonitrile (PAN) and then loaded onto thin chromatographic silica gel (SG) as a Cr(VI) colorimetric sensor (DPC/PAN/SG); its stability could be prolonged from 18 h to more than 30 days, and its repeatable reproducibility is realized via facile electrospinning. By replacing the traditional Ed method with DCNN, the detection limit is greatly improved from 1.571 mg/L to 50.00 μg/L, and the detection range is prolonged from 1.571–8.000 to 0.0500–20.00 mg/L. The complete test time is shortened to 3 min. Even without time-consuming and easily stained enrichment processing, its detection limit of Cr(VI) in the drinking water can meet on-site detection requirements by USEPA, WHO, and China.

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Selective and Efficient Photoextraction of Aqueous Cr(VI) as a Solid-State Polyhydroxy Cr(V) Complex for Environmental Remediation and Resource Recovery

Cited by 57 publications

References 49 publications

Catechol-Functionalized Chitosan Synthesis and Selective Extraction of Germanium (IV) from Acidic Solutions

Catechol-Functionalized Chitosan Synthesis and Selective Extraction of Germanium (IV) from Acidic Solutions

Emergence of Non‐photoresponsive Catalytic Techniques for Environmental Remediation and Energy Generation

Few-Shot Learning-Based, Long-Term Stable, Sensitive Chemosensor for On-Site Colorimetric Detection of Cr(VI)

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