CHEMICAL PHYSICS LETTERS
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2022
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IF 2.719
Sijing Zeng,Dengjie Zhong,Yunlan Xu,Nianbing Zhong
D201@S-nZVI was synthesized to remove Cr(VI) from aqueous solution. Batch experiments demonstrate it has excellent removal performance, recycling performance and longevity. Its removal efficiency and maximum adsorption capacity reaches 89.67% and 137.35 mg·g −1 for 100 mg·L −1 Cr(VI) solution, respectively. This is because S-nZVI (nZVI@FeS x ) has a core-shell structure. The FeS x layer prevents the leaching of iron and has excellent reduction and electron transport capability. In addition, the functional groups of D201 can electrostatically attract Cr(VI), and its unique skeleton structure well disperses S-nZVI. The adsorption is a spontaneous exothermic process. This research provides an effective remediation material for Cr(VI) wastewater.
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Materials
·
2022
·Vol. 15
·期 5
·1733
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IF 3.748
Jinyu Zhang,Cai Jing,Binsong Wang
A signal shut-off probe of Si, N-codoped carbon quantum dots (Si, N-CQDs) was exploited to detect Cr(VI) by fluorescence quenching without the aid of any biomolecules or labeling materials. The sensing system prepared the precursor of diacetone acrylamide and the silane coupling agent 3-aminopropyltriethoxysilane (KH-550) by a simple hydrothermal method, and the quantum yield is as high as 75% Si, N-CQDs. The fluorescence stability and microstructure of the Si, N-CQDs were studied. The Si, N-CQDs has a high sensitivity for detecting Cr(VI) with the linear range of 0–200 μM and the detection limit of 0.995 μM. The quenching mechanism of Si, N-CQDs is attributed to FRET.Keywords:Si,N-codoped carbon quantum dots;hexavalent chromium;fluorescence sensor;mechanism attributed to FRET
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2022
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IF 0.847
Fazheng Huang,Xinhao Li,Zhen Zhang,Ziqi Jiang,Guoqiang Wang,Lingyun Li,Yan Yu
The exploration of a dual-functional sensor is the key to effectively detect the Cr(VI) and Fe(III) cations in water, which is important to human health and environmental sustainability. Because of the phase stability and excellent luminescence, the rare-earth coordination polymers have great potential as dual-functional sensors. Here, we develop a Y 0.91 Eu 0.09 (H 2 O) 2 {C 6 H 3 (CO 2 ) 3 }(MIL-92(Y):9%Eu 3+ )-based dual-function luminescent sensor on Cr(VI) and Fe(III), which exhibits excellent phase stability and dispersibility in water. The luminescence of MIL-92(Y):9%Eu 3+ aqueous suspension quenches on Fe 3+ with Stern-Volmer constant K sv of 1.79 × 10 3 M -1 and limit of detection of 17 μM. The MIL-92(Y):9%Eu 3+ aqueous suspension also has turn-off sensing ability towards Cr 2 O 7 2- and CrO 4 2- with K sv values of 3.5 × 10 3 and 6.14 × 10 3 M -1 , respectively. It has detection limitations of 10 and 5 μM on Cr 2 O 7 2- and Cr 2 O 7 2- ions, respectively.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 35
·e52822
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IF 3.057
Hejia Chang,Qinghu Meng,Defa Liu,Yue Wu,Zhizhou Yang,Bin Sun,Fang Liu,Yu Liu
Synthesis of hollow spherical polyaniline (HSPANI) with the merits of facile strategy, low cost, low safety risk and high adsorption capacity of Cr(VI) is always a big challenge. In this manuscript, we proposed a facile way to preparation of HSPANI by using the poly(styrene-co-acrylic acid) sphere as template. The results indicated that HSPANI was emeraldine comprised of lots of basically uniform hollow spheres, and its average pore diameter was about 300 nm. HSPANI displayed high adsorption capacity of Cr(VI), and its value arrived at 601.3, 347.8, 235 mg g −1 at pH = 1, 2, and 3, respectively, which were high than many other adsorbents. The endothermic, spontaneous and chemical adsorption process was responsible for this adsorption. The Cr(VI) adsorption capacity was significant relied on its pH, contact time, Cr(VI) concentration and adsorption temperature. The adsorption behavior was well agreed with pseudo second-order equation and Redlich–Peterson isotherm models. HSPANI exhibited remarkable selectivity for adsorption of Cr(VI) even if the K + , Cu 2+ , NO 3 − and SO 4 2− were coexisted. HSPANI also displayed excellent regeneration performance. Therefore, this work not only provided a facile way to synthesis of hollow spherical polyaniline, but also supplied a potential adsorbent for adsorption of Cr(VI) from the industrial wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Kailian Zhang,Man Zhou,Kai Yang,Changlin Yu,Ping Mu,Zhenzhen Yu,Kangqiang Lu,Weiya Huang,Wenxin Dai
The low-usage of solar energy and the sluggish separation efficiency of the photogenerated electrons/holes pairs are the obstacles in the practical application of photocatalysts. The integration of upconversion and Z-scheme heterojunction is expected to break the barriers to achieve the efficient charge separation and broaden near-infrared light absorption . Herein, an effective indirect Z scheme AgInS 2 /In 2 S 3 heterostructure with carbon quantum dots (CQDs, as the electron conduction medium) and Lu 3 NbO 7 :Yb, Ho (as upconversion function) has been successfully synthesized. Consequently, the Lu 3 NbO 7 : Yb, Ho/CQDs/AgInS 2 /In 2 S 3 heterostructure exhibited superior photocatalytic activities for Cr(VI) reduction and H 2 O 2 production, reducing 99.9% of Cr(VI)(20 ppm, 15 min) and 78.5% of Cr(VI) (40 ppm, 30 min) with visible light irradiation as well as 94.0% of Cr(VI) (20 ppm, 39 min) under NIR light irradiation. Simultaneously, the heterostructure could generate 902.9 μM H 2 O 2 for 5 h under visible light irradiation. The intensive photocatalytic properties could primarily be attributed to the boosted light absorption capacity, the improved solar-to-energy conversion by the remarkable upconversion capacity of Lu 3 NbO 7 : Yb, Ho/CQDs and the faster charge transfer through a Z-schematic pathway. This work is anticipated to open a novel “window” for designing the efficient photocatalysts by coupling of Lu 3 NbO 7 : Yb, Ho and CQDs.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Lin Zhang,Fenglian Fu,Guangda Yu,Guangzhao Sun,Bing Tang
Ferrihydrite-humic acid co-precipitates have impacts on the adsorption and reduction of Cr(VI) in the natural environment. Besides, ferrihydrite-humic acid co-precipitates usually coexist with foreign metal cations like Al(III) and Mn(II), which may change the properties of ferrihydrite and affect the fate of Cr(VI). In this work, structurally incorporated Al(III) or Mn(II) in ferrihydrite-humic acid co-precipitates with Cr(VI) (Fh-HA-Cr-Al or Fh-HA-Cr-Mn) were prepared, and the behavior and phase transformation of co-precipitates were explored via the characterization analyses of samples during aging for 10 days. This study showed that partial adsorbed Cr(VI) was reduced to Cr(III) in the presence of humic acid , thereby reducing the toxicity of Cr(VI). Interestingly, two different results occurred because of the incorporation of Al(III) and Mn(II). Al(III) hindered the transformation of ferrihydrite and changed the aging products by inhibiting the dissolution of ferrihydrite, which decreased Cr to incorporate iron minerals. By contrast, doping of Mn(II) accelerated the phase transformation of co-precipitates, and was more conducive to the encapsulation and fixation of Cr. The results of this study can facilitate the understanding of the effects of Al(III) and Mn(II) on Cr(VI) fixation during the aging of Fh-HA-Cr.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Wei Zhang,Qiao Li,Rui Li,Nan Shen,Jiansheng Li,Jinyou Shen,Xiuyun Sun,Weiqing Han
Industrial wastewater containing organic ligands and heavy metals is considered a serious public health threat, and its treatment and purification have become challenging tasks. Moreover, the organic-chelated heavy metals formed by common organic ligands and free heavy metals can cause many problems and concerns because of their poor biodegradability, high solubility, and extreme stability. In this study, aluminum-containing ferrihydrite (Fh-Al) adsorbents of different composition molar ratios were prepared and utilized to remove typical EDTA-Cr(III) in an aqueous system, and the associated removal mechanism was examined. The experimental results show that adding Al not only enhances the removal rate of EDTA-Cr(III) by the Fh-Al adsorbent in a wide pH range (pH = 3–9) but also increases the maximum adsorption capacity of EDTA-Cr(III). In addition, the specific surface area of Fh-Al can be increased by adding aluminum with different molar ratios, thus promoting its adsorption performance for EDTA-Cr(III). Furthermore, surface complexation and electrostatic attraction were proposed as possible mechanisms of EDTA-Cr(III) adsorption by Fh-Al. This study shows that Fh-Al-6 adsorbent can adsorb common EDTA-chelated heavy metals (such as EDTA-Pb, EDTA-Cr, EDTA-Cu and EDTA-Cd) in one step, with maximum adsorption capacities of 41.47, 32.33, 16.51 and 31.27 mg/g at pH = 3. The Fh-Al-6 adsorbent can be reused after being regenerated in a 2 g/L Na 2 SO 4 solution. This study provides new expectations for treating wastewater containing organic groups and heavy metals.
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EUROPEAN POLYMER JOURNAL
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2021
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IF 4.598
Zhanfeng He,Qiang Chen,Yuanyuan Luo,Yuan He,Yinshan Zhang,Tong Liu,Wenyuan Xu,Jiali Zhang,Yongxin Liu,Leyan Xiong,Shaohui Wang,Zanru Guo
Adsorbent with high and recyclable adsorption for pollutants without secondary pollution is one of great potential in water treatment. Here, degradable CO 2 -responsive microgels with big size and wrinkled porous structure were prepared. The microgels underwent reversible volume phase changes upon alternative stimulus of CO 2 and N 2 , and thereby exhibited a switchable, selective, and recyclable adsorption for anionic dyes and metalloids (Cr(VI) and As(V)). The adsorption performance was improved due to the wrinkled porous structure, and the maximum adsorption capacity was up to 1537 mg g −1 for metanil yellow (MY). The competitive adsorption in binary and ternary system revealed that the affinity was in the order of MY > ponceau S (PS) > Cr(VI). Besides, the adsorbates could be desorbed by heating or treating with solution of pH 12. Microgels regenerated with CO 2 trigger exhibited high adsorption ability after ten consecutive recycling trials, and could be applied to fixed-bed adsorption/desorption system. Moreover, microgels could be degraded. Thus, this kind of degradable microgels have potential applications in the treatment of complex industrial wastewaters and avoid the additional pollution caused by the accumulation of waste adsorbents.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Jiangli Sun,Yanping Hou,Zebin Yu,Lingli Tu,Yimin Yan,Shanming Qin,Shuo Chen,Danquan Lan,Hongxiang Zhu,Shuangfei Wang
It is urgently needed to develop high-performance materials that can synchronously remove heavy metals and organic pollutants . Herein, the visible-light responsive Zn 3 In 2 S 6 /AgBr composites were prepared for concurrent removals of metronidazole (MNZ) and Cr (VI). In the Cr (VI)-MNZ coexisting system, the removals of MNZ and Cr (VI) using the optimized Zn 3 In 2 S 6 /AgBr-15 photocatalyst reached 98.2% and 94.8% within 2 h, respectively; higher than those using counterparts. The radical species trapping and electron spin resonance (ESR) results demonstrated that ·OH was the most dominated species for MNZ oxidation , and photo-generated electrons were responsible for Cr (VI) reduction. Besides, slight competition for ·O 2 ˉ during the simultaneous MNZ degradation and Cr (VI) reduction occurred. Energy band structure analysis, ESR and the outstanding photocatalytic performance for MNZ and Cr (VI) removals demonstrated that the Zn 3 In 2 S 6 /AgBr-15 was a Z-scheme photocatalyst, which promoted photo-induced carrier′s separation. Possible MNZ degradation pathways and mechanism over the Z-scheme Zn 3 In 2 S 6 /AgBr were also proposed based on the identified intermediates. This study could inspire new ideas for design of efficient Z-scheme photocatalysts for wastewater treatment .
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ACS Applied Nano Materials
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2021
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IF 5.097
Jianqiu Gong,Weiwei Zhang,Tapas Sen,Yichen Yu,Yuchen Liu,Jinlong Zhang,Lingzhi Wang
Photocatalysis is a promising technology to treat dilute phenol–Cr(VI) mixture, where photoinduced electrons are commonly thought of as the main active species for Cr(VI) reduction. However, it generally depends on the surface adsorption to achieve efficient electron transfer. Meanwhile, the possible contribution of reductive quinone derivatives oxidized from phenol to Cr(VI) reduction has been rarely explored. The key is to explicitly understand the relation between the phenol oxidation pathway and Cr(VI) reduction. Herein, Ag/AgCl/MIL-101(Fe) prepared by directly loading Ag nanoparticles on MIL-101(Fe) was applied to the joint treatment of phenol and Cr(VI). The role of quinone derivatives in reducing Cr(VI) was revealed by excluding the surface adsorption. During the phenol oxidation, •OH radicals were more consumed in the initial stage for the ring opening of phenol. Meanwhile, 1O2 evolved from •O2– gradually caused the accumulation of reductive quinone intermediates, which dramatically accelerated the Cr(VI) reduction afterward. This study demonstrates the significance of controlling the evolution process of active oxygen species for the joint photocatalytic treatment of phenol–Cr(VI) mixture.
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CARBOHYDRATE POLYMERS
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2021
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IF 9.381
Ahmed M. Omer,Eman M. Abd El-Monaem,Mona M. Abd El-Latif,Gehan M. El-Subruiti,Abdelazeem S. Eltaweil
Metal organic frameworks (MOFs) have become premium candidates for the removal of hazardous contaminants from wastewater. However, MOFs have a vast obstacle which is their poor recyclability. In this study, ZIF-67 was decorated with magnetic Fe 3 O 4 nanoparticles, and then embedded into aminated chitosan (AmCs) matrix to form core-dual shell Fe 3 O 4 /ZIF-67@AmCs composite beads. Diverse analysis tools were utilized to ensure the successful fabrication of the magnetic composite beads. The fabricated magnetic composite beads were examined their adsorptive removal aptitude towards toxic Cr(VI) ions. The gained results refereed that a maximum adsorption capacity of 119.05 mg/g was attained by magnetic Fe 3 O 4 /ZIF-67@AmCs composite beads at 25 °C. The process obeyed both of Langmuir and Freundlich isotherm models, and the pseudo 2nd order was more suitable kinetic model to represent the adsorption process. Besides, Fe 3 O 4 /ZIF-67@AmCs composite showed an excellent recyclability for the removal of Cr(VI) ions from their aqueous solutions for seven consecutive cycles.
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Journal of Cleaner Production
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2021
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IF 9.297
Gang Zhou,Yuying Wu,Peifang Wang,Hao Li,Rong Huang,Yitong Liu,Junhong Guo
Exploring photocatalysts to accelerate heavy metal Cr(VI) photoreduction is of great significance. Different from traditional strategies, this work proposes a simple and feasible strategy to construct cadmium/rhenium sulfide (CdS/ReS2) S-scheme heterojunctions for enhancing carrier separation through a covalent-anion-driven self-assembling approach. Herein, the construction of internal electric field induced by an atomic-hybridization at CdS/ReS2 interface drives the photoexcited electrons from one-dimensional CdS nanowires to two-dimensional ReS2 nanosheets upon light irradiation, resulting in the formation of an S-scheme carrier kinetic pathway, which enables the separation of electron-hole pairs to accelerate Cr(VI) photoreduction . As a result, the reduction reaction of CdS/ReS2 heterojunction is increased about 11.4 and 24.3 times compared to pristine CdS and ReS2. Our findings provide a new insight in regulating carrier transfer pathway and designing new-type photocatalysts .
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