Environmental Science-Nano
·
2023
·Vol. 11
·期 1
·229-240
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IF 7.3
Wen Lu,Chen Wang,Yuxuan Bai,Chengde Xie,Zhixiong Zhang,Wenhui Song,Jianjun Wang
Polluted wastewater containing organic pollutants and heavy metals is increasing and harms environmental ecosystems and human health. Designing and producing an efficient photocatalyst is therefore crucial for treating polluted wastewater. In this study, electron-deficient benzothiadiazole was used as the electron acceptor, and electron-rich thiophene as the electron donor using a solvothermal method. The successful preparation of a novel visible-light responsive donor–acceptor type covalent organic framework (HDU-26) has been demonstrated using various characterization techniques. The conjugated structure of the electron-donating and electron-accepting units promoted the charge transfer of the HDU-26 photocatalyst, effectively reduced the band gap, and suppressed the electron–hole (e−–h+) complexation. The photocatalytic performance was investigated under the influence of different parameters. Under optimal conditions, HDU-26 achieved a photocatalytic reduction efficiency of up to 99.5% for Cr(VI). Over five reaction cycles, HDU-26 was still able to maintain a high level of photocatalytic activity, with the Cr(VI) removal rate reaching 97.4%. The major active species for the photocatalytic reduction of Cr(VI) were e− and ·O2− radicals. In addition, the oxidation of organic matter results in an increase in photogenerated e−–h+ separation. Moreover, the photocatalytic rate of HDU-26 was significantly accelerated due to the synergistic effect in the mixed system of Cr(VI)/organic pollutants (RhB, MB, MO). In conclusion, the high availability of active sites, excellent stability, and recyclability of HDU-26 indicate its potential applications for removing organic pollutants and heavy metal ions from contaminated wastewater.
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POLYMER ENGINEERING AND SCIENCE
·
2023
·Vol. 63
·期 11
·3891-3905
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IF 3.2
Junhui Si,Yuanchang Deng,Changxiong Gong,Zhixiang Cui,Qianting Wang
Deacetylated cellulose acetate/thermoplastic polyurethane@graphene oxide (DA/TPU@GO) nanofibrous membranes were prepared through the combination of electrospinning, deacetylation, and ultrasound-assisted surface treatment techniques. The morphology, wettability, and mechanical properties of composite nanofiber membranes were studied via SEM, TEM, water contact angle measurements, and mechanical tests. Moreover, the adsorption capacity and mechanism of DA/TPU@GO nanofiber membranes for methylene blue and chromium (Cr (VI)) were analyzed. The introduction of active sites from GO led to a significant increase in the adsorption capacity of the DA/TPU@GO composite membranes compared with the DA/TPU composite nanofiber. The composite membrane featured adsorption capacities of 152.7 mg/g (25°C, pH 3) and 122.1 mg/g (25°C, pH 7) for Cr (VI) and methylene blue, respectively, which are higher than most other composite GO-based adsorbents. The adsorption mechanism of the DA/TPU@GO composite membrane was consistent with the Langmuir isotherm and second-order kinetic models. Therefore, the DA/TPU@GO composite nanofiber membrane served as an effective adsorbent with broad application prospects in the sewage treatment field owing to its excellent adsorption capacity. Highlights Nanofibers were prepared for the absorption of methylene blue (MB) and Cr (VI). Nanofibers exhibited adsorption capacities of 152.7 and 122.1 mg/g for Cr (VI) and MB. Adsorption mechanism follows Langmuir isotherm and second-order kinetic models. Nanofibers have wide potential applications in sewage treatment.
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EUROPEAN POLYMER JOURNAL
·
2021
·
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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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
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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ACS Applied Nano Materials
·
2021
·
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
·
2021
·
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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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 10
·12459-12473
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IF 3.056
Guo Tongtong,Yang Shuang,Chen Yunning,Yang Lu,Sun Yingnan,Shang Qingkun
In this paper, the kinetic characteristics and cycle stability of Fe-complex/TiO 2 in the process of degradation of phenolic pollutants and reduction of heavy metal Cr(VI) were studied systematically. First, the structural characteristics and photocatalytic activities of Fe(III)-(8-hydroxyquinoline-5-carboxylic acid)-TiO 2 (Fe-HQC-TiO 2 ) nanoparticle to degrade phenolic pollutants and reduce Cr(VI) simultaneously had been investigated. Compared with the single degradation, the efficiency of synergistic degradation/reduction had been improved and the degradation/reduction rate had been obviously accelerated. In particular, the cyclic stability of Fe-HQC-TiO 2 photocatalyst decreased obviously when it was used to reduce Cr(VI) alone, but it could still keep above 90% after three cycles when it was used for reduction of Cr(VI) and degradation of phenol synergistically. Second, to Fe-HQS/TiO 2 nanoparticle or Fe-HQS/TiO 2 nanotube (HQS (8-hydroxyquinoline-5-sulfonic acid)), the synergistic degradation/reduction (2,4-dichlorophenol/Cr(VI)) efficiencies were always greater than those of a single degradation/reduction and the time was greatly reduced. All the results indicated that there were interactions between Cr(VI) and phenol or 2,4-dichlorophenol in the photocatalytic process. The possible mechanism of synergistic accelerated degradation of phenolic compounds and reduction of Cr(VI) was proposed by analyzing and testing the surface characteristics of photocatalyst and the properties of photocatalytic system during the synergistic degradation/reduction.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Qiuyan Luo,Hanmeng Yuan,Min Zhang,Ping Jiang,Ming Liu,Dong Xu,Xin Guo,Yiqiang Wu
To effectively detect and remove environmentally hazardous Cr(VI), a novel 3D porous fluorescent hydrogel was synthesised using amino-modified carbon dots and cellulose nanofibers. The synthesised fluorescent hydrogel was characterized to determine its morphology, crystalline structure, chemical composition and optical property using scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, UV–vis absorption spectroscopy and photoluminescence spectroscopy. The sorption properties of the synthesised fluorescent hydrogel were further analyzed. The maximum sorption capacity for Cr(VI) reached 534.4 mg/g, the adsorption isotherm was well fitted using Langmuir model, and the adsorption kinetics were well fitted using a pseudo-second-order model. The sensing ability of the synthesized hydrogel for Cr(VI) was also determined. Furthermore, the mechanism of Cr(VI) sorption and sensing was determined. Accordingly, this novel 3D porous fluorescent hydrogel was identified to be a promising sorbent with advantages of excellent sorption and sensing abilities for environmentally hazardous Cr(VI).
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lixiang Zhang,Pan Li,Luping Feng,Xi Chen,Jiatian Jiang,Sheng Zhang,Anchao Zhang,Guofu Chen,Hua Wang
Visible-light-driven and ultra-stable CoS x /CdS photocatalysts were controllably fabricated by the ZIF-67-templated one-pot solvothermal route for highly efficient photocatalytic Cr(VI) reduction. It was discovered that the resulting CoS x /CdS composites could present different photocatalytic activities controllably depending on the CoS x -to-CdS molar ratios used. The one with 1/16 M ratio could display the highest photocatalytic reduction performance for Cr(VI) with the efficiency up to 100% within 30 min, which is 5.6-fold and 2.1-fold higher than that of pristine CoS x and CdS, respectively. Herein, the components of CoS x and CdS with well-matched energy-band structures might serve separately as the electrons donor and the holes quencher to prolong the lifetime of photogenerated electrons in CoS x /CdS composites. A direct Z-scheme heterojunction could be thus constructed for promoting the charge carrier transferring with the improved redox abilities, leading to the robust photocatalysis of CoS x /CdS photocatalyst. Moreover, the developed CoS x /CdS photocatalyst could present superior stability with the structure and activity well survived after five photocatalytic cycles. This work may pave the way towards the controllable construction of a direct Z-scheme photocatalytic system by synergistically combining two kinds of components with matched energy-band structures, achieving the enhanced photocatalysis for the wide applications in the environmental remediation field.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
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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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
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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Journal of Cleaner Production
·
2021
·
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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