COLLOID AND POLYMER SCIENCE
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2026
·
IF 2.9
Chen Sihao,Cao Wei,Li Hao,Han Meng,Shi Wenhai,Liao Xiaobin,Zhou Zhenming
The interaction between new pollutants microplastics(MPs) and toxic heavy metals in a coexisting environment could alter both their environmental behavior and effects. Polyamide (PA) MPs show affinity toward highly toxic Cr(VI), thus the interaction mechanism needs to be further understood. Herein, PA MPs aged with different methods such as ultraviolet irradiation in air/sea water and chemical chlorination, were used to explore their adsorption and reduction performance and mechanism toward Cr(VI) under different solution conditions. The research results show that after aging treatment, the content of amide bonds in PA MPs decreased, while the number of oxygen containing functional groups increased. Under the condition of pH 3.0, the adsorption capacity reaches its maximum value. Higher temperatures facilitate the adsorption process, whereas the presence of salinity and dissolved organic matter (DOM) considerably hampers adsorption. The behavior of PA MPs in adsorption aligns with the pseudo-second-order kinetic model as well as the Langmuir adsorption isotherm model. Further studies show that the binding of Cr(VI) to PA MPs is primarily achieved through electrostatic interactions, complexation, and hydrogen bonding. It is important to mention that PA MPs have the ability to convert Cr(VI) to Cr(III) in solution, even in conditions involving UV light, the presence of DOM, and environments lacking oxygen. UV aging enhanced the adsorption and reduction performance of PA MPs for Cr(VI). This research offers fresh scientific insights into the mechanisms of formation and the environmental interactions related to pollution caused by microplastic-heavy metal composites. Graphical abstract
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
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2022
·Vol. 110
·期 1
·1-7
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IF 2.807
Gu Xinfeng,Mo Huijing,Wang Lei,Zhang Lianyi,Ding Zhuhong
Transport of Cr(VI) at the presence of bentonite colloid was carried out in saturated porous media of 16–18 mesh and 40–60 mesh sand columns. Effects of flow rate, pH, ion strength, humic acid and bentonite concentrations on Cr(VI) migration were investigated. The results show that the increase of flow rate accelerated the breakthrough of Cr(VI) and BP, but the transport mass of dissolved Cr(VI) decreased by ~ 15.0% when flow rate increased to 2.5 ml min −1 . Increasing IS to 10mM resulted in decrease of Cr(VI) transport mass by 6.86%–21.4%. Increase of pH and decrease of bentonite concentration favored the transport of dissolved Cr(VI). Humic acid had little effect on transport amount of Cr at pH7. Cr(VI) transport was dominated by the dissolved Cr(VI). The transport data of dissolved Cr(VI) were well described by the two-site model. The presence of BP reduced total Cr(VI) transport mass in co-transport.
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PubMed
高影响因子
E-POLYMERS
·
2022
·Vol. 22
·期 1
·938-948
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IF 3.074
Xin Wang,Peng Li,Guifang Wang,Li Zhao,Huiling Cheng
The Cr( vi ) ion-imprinted composite membranes (Cr( vi )-IICMs) were prepared by using the surface imprinting method. The template ion was Cr( vi ), the functional monomer was 4-vinylpyridine (4-VP), and the nylon filter membrane (nylon-6) was the support membrane. Non-imprinted composite membranes (NICMs) were prepared under the same conditions as the corresponding Cr( vi )-IICM. The adsorption effect of the imprinted membrane can reach 2.4 times that of the corresponding non-imprinted membrane. Meanwhile, the adsorption quantity of Cr( vi )-IICM was 34.60 μmol·g −1 . The physical characteristics of membranes were confirmed by Brunauer–Emmett–Teller and scanning electron microscopy. Inductively coupled plasma emission spectrometry was used to analyze their adsorption properties and permeation selectivity. Cr( vi )-IICM and NICM were both mesoporous materials from the structural characterization and performance test results. Their adsorption behavior conformed to the Langmuir isotherm adsorption model. The permeation recognition mechanism of Cr( vi )-IICM was the Piletsky’s gate model. The IICM still has excellent permeability selectivity to Cr( vi ) in the presence of competitive ions. The results provided a reference for the isolation and enrichment of Cr( vi ).
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Peng Liu,Xiaowei Wu,Suyi Pan,Jiamin Dai,Zixuan Zhang,Xuetao Guo
Wastewater treatment plants (WWTPs) are the important source of microplastics (MPs) in the environment, and disinfection processes bear high potential to degrade MPs. This study investigated the physicochemical degradation, dissolved organic products and interaction with co-existed pollutants (heavy metal and pharmaceutical) on polyethylene (PE), polypropylene (PP) and polystyrene (PS) MPs during simulated disinfection processes. Compared to photo or chlorination, photochlorination significantly resulted in the physicochemical degradation, including morphology alteration, fragmentation, and chemical oxidation on PP and PS MPs, but showed relatively low effect on PE, indicating the different resistance among polymers to disinfected treatment. Photochlorination also caused the formation of chain-scission organic compounds and even chlorinated products from MPs (e.g. C 11 H 19 O 4 Cl for PP and monochlorophenol, dichlorophenol, chloroacetophenone and chlorobenzoic acid for PS), which may form disinfection byproducts to induce healthy risk. The adsorption potentials of MPs for Cr(VI) or amlodipine were enhanced by photochlorination since the cracking and formed oxygen functional groups enhanced the pore filling and surface precipitation of Cr(VI), and the electrostatic attraction and hydrogen bonding with amlodipine. The findings indicated the physicochemical degradation of MPs and the combined pollution with co-existed pollutants, highlighting the health risks of MP-derived organic products during the disinfection treatments (even in normal dosage) in WWTPs.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Xiaoyan Liu,Shenyu Zhang,Xinying Zhang,Hao Guo,Xinde Cao,Ziyang Lou,Wei Zhang,Chuanhua Wang
A novel hydrogel-supported nanoscale zero-valent iron (nZVI) composite (nZVI@LH) was synthesized by ion exchange and in-situ reduction. The removal efficiency was tested, and the mechanism was also explored. The nZVI@LH at the precursor Fe(II) ion concentration of 0.1 mol/L presented an enhanced Cr(VI) removal capacity of 310.86 mg/g Fe 0 at pH 5.3, which was 11.6 times more than that of the pure nZVI. The removal efficiency of the composite at pH 2.1 was more than double compared with alkaline or neutral conditions. Scanning electron microscopy (SEM) suggested that the nZVI particles were uniformly immobilized in the lignin hydrogel. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) provided evidence supporting the removal mechanism. According to the XPS results, the high removal capacity of the composite was attributed to chemical reduction/precipitation (69.7%), surface sorption (19.7%), and swelling uptake (10.6%). The pseudo-first-order reduction kinetics and pseudo-second-order kinetic model were employed to simulate the kinetic data, which supported the mechanism that chemical reduction and surface sorption could simultaneously remove Cr(VI). The electron acceptor and electron donor affected the reaction rate, and the presence of humic acid significantly inhibited the reaction. The present study demonstrated that lignin hydrogel acted as a carrier to prevent aggregation of nZVI particles. nZVI particles loaded on lignin hydrogel showed high reactivity and high degree of utilization compared with bare-nZVI. These results exhibited the great potential of nZVI@LH in practical water treatment due to its high activity.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yuxiang Hua,Chengyao Hu,Muhammad Arif,Shen-ming Chen,Min Zhang,Xiaoheng Liu
The design of efficient and stable photocatalysts for the removal of heavy metals in the environment has become a research hotspot. Here, a composite photocatalyst with three-dimensional In 2 S 3 microspheres supported by WO 3 nanoparticles was synthesized for the photoreduction of Cr(VI) for the first time. The constructed composite catalyst has a direct Z-scheme electron transport mechanism without any precious metals (Au, Pt, and Ag), quantum dots (TiO 2 QDs) or carbon materials (Graphene) as electronic media. Constructing a direct Z-scheme WO 3 /In 2 S 3 photocatalyst can greatly retain the reduction and oxidation reaction sites on the surface of the heterojunction and accelerate the reduction reaction. Under visible light irradiation, it greatly promotes the photocatalytic reduction of Cr(VI), which is 67.7 times and 3.6 times the reduction rates of WO 3 and In 2 S 3 , respectively. The favorable photocatalytic performance of WO 3 /In 2 S 3 should be attributed to the effective interfacial contact between the semiconductors in the Z-scheme system, thereby realizing effective electron transfer and charge separation. In addition, the stability of WO 3 /In 2 S 3 was studied, and a possible mechanism in the photoreduction process of Cr(VI) was proposed.
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REACTIVE & FUNCTIONAL POLYMERS
·
2021
·
IF 3.975
Yiran Sun,Qilin Gui,Andong Zhang,Shuxian Shi,Xiaonong Chen
There are huge demands for the development of green, environmentally friendly, and easily prepared cationic adsorbents for treatment of chromium-contaminated water. In this research, we demonstrate the fabrication of a novel polyvinylamine-grafted polypropylene membrane (PPM-PVAm) for Cr(VI) adsorption. Based on a rapid two-step method, polypropylene membrane (PPM) was grafted with high biomedical safety N-vinylformamide (NVF), and then amino groups were generated via hydrolysis of the poly(N-vinylformamide) (PNVF) and these amino groups could be protonated under acidic condition as Cr(VI) adsorbing sites. The effects of both the PNVF grafting rate and its degree of hydrolysis on the adsorption performance of PPM-PVAm were investigated. The membrane with a PNVF grafting rate around 55% (wt) and a degree of hydrolysis around 70–80% exhibits the best performance for Cr(VI) adsorption under the optimal conditions, i.e. pH 2 at about 40 °C. The adsorption of Cr(VI) on PPM-PVAm matches the Langmuir model, showing a maximum Cr(VI) adsorption capacity of 208.3 mg per gram dry membrane. PPM-PVAm could be deprotonated under alkaline condition so the adsorbed Cr(VI) could be easily removed by NaOH/NaCl aqueous solution. The membrane shows excellent recycling performance, and 90.6% of the adsorption capability remains even after 10 cycles of adsorption-desorption test. Combining the unique performance and eco-friendly process in the fabrication of the membrane, PPM-PVAm shows great potential in adsorptive removal of Cr(VI) from water.
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Environmental Science-Nano
·
2021
·Vol. 8
·期 11
·3331-3342
·
IF 8.131
Dingyuan Zheng,Wenrui Yao,Ce Sun,Xiaojian Chen,Jiyuan Zhou,Baiwang Wang,Haiyan Tan,Yanhua Zhang,Yonggui Wang
Chromium (Cr(VI)) pollution poses a serious threat to the ecological environment and biological health; therefore, there is an urgent need to develop advanced technologies for Cr(VI) detection and removal. Here, a novel fluorescent wood sponge (citric acid modified wood sponge decorated with carbon dots, CA/WS-CDs) was constructed combining hierarchical porous wood sponge (WS) and carbon dots (CDs) via chemical bonding, which could simultaneously detect and remove hexavalent Cr(VI) in an aqueous medium. The chemical and physical structure of the fluorescent wood sponge was characterized, and its detection and adsorption performances for Cr(VI) were studied. The results demonstrated that the CA/WS-CDs showed excellent performance for Cr(VI) detection and removal. After being immersed in a Cr(VI) solution (50 mL, 50 mg L−1) at 25 °C for 24 h, the strong blue fluorescence of CA/WS-CDs-3 under 365 nm light weakened and fluorescence quenching started to occur, which makes the fluorescent wood sponge a detector of Cr(VI). Moreover, this novel fluorescent wood sponge had a higher adsorption ability for Cr(VI) (maximum adsorption capacity, 450.5 mg g−1), and its sorption performance met Langmuir and pseudo-second-order models. Furthermore, FTIR and XPS analysis confirmed that the hierarchical structure of the fluorescent wood sponge provided many effective sorption sites and ion transport channels, thereby guaranteeing the selective detection and efficient adsorption properties for Cr(VI). Such intriguing Cr(VI) warning and sorption performance make the proposed CA/WS-CDs hold huge prospects for practical environmental remediation.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Peng He,Jianyu Zhu,Yaozong Chen,Fang Chen,Jinglei Zhu,Mengfei Liu,Ke Zhang,Min Gan
Organic pollutants and heavy metals often coexist in wastewater, their simultaneous and effective removal from wastewater has a particular significance for environmental remediation. In this study, pyrite (FeS 2 ), the most abundant iron mineral in the Earth’s crust, was selected as a catalyst to activate persulfate for the simultaneous removal of 2,4-dichlorophenol (2,4-DCP) and Cr(VI), two common contaminants in wastewater. The results indicated that 76.2% of 2,4-DCP and 80.1% of Cr(VI) were simultaneously removed within 120 min in the pyrite/persulfate system. The simultaneous removal efficiency of 2,4-DCP and Cr(VI) by the pyrite/persulfate system was influenced by the contaminant concentration, solution pH and organic acids. The radicals SO 4 ·− and ·OH were detected as the oxidative species in the pyrite/persulfate combined system using electron spin resonance (ESR) spectroscopy, and quenching experiments with methanol and tert-butanol indicated that SO 4 ·− played a predominant role in the degradation of 2,4-DCP. The radicals (SO 4 ·− and ·OH) produced from the activation of persulfate by pyrite principally contributed to 2,4-DCP disintegration, while the removal of Cr(VI) was primarily attributed to the reduction ability of pyrite. Experiments and density functional theory (DFT) calculation results indicated that Fe is the main catalytic site, and the reductive sulfides of the pyrite surface mediated Fe 2+ recovery as donors during reaction processes. This work presented a ubiquitous natural sulfide mineral with excellent catalytic performance in the heterogeneous persulfate activation, implying a new strategy in wastewater treatment for simultaneous removal of heavy metal and organic compounds.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiaohong Hu,Jia Wen,Haibo Zhang,Qian Wang,Caiya Yan,Lang Xing
The most important thing to do with hexavalent chromium (Cr(VI)) removal in wastewater through adsorption-reduction method is to find an adsorbent that has both strong adsorbability and reducibility. Herein, an eco-friendly material ZIF-8-EGCG, which was a combination of epicatechin gallate (EGCG) and ZIF-8, was synthesized to treat Cr(VI)-containing wastewater. At room temperature, the maximum adsorption amount of Cr(VI) reached 136.96 mg·g −1 , and the Cr(VI) reduction rate (96%) was much better than that of the original ZIF-8 (37%). Such outcome was among the best in the existing studies using MOFs to treat Cr(VI). In addition, the characterization results showed that the surface of ZIF-8-EGCG was electronegative. The material was irregular sphere with pore size of 7.12 nm and BET surface area of 113.02 m 2 ·g −1 . The well-fitted Langmuir adsorption isotherm and pseudo first/second-order kinetics model suggested that the adsorption of Cr(VI) on ZIF-8-EGCG was governed by both physical and chemical processes. Stability results revealed that the overall stability of ZIF-8-EGCG due to the etched structure was slightly inferior to ZIF-8, especially at higher temperatures (>35 °C). Simultaneously, the reaction between ZIF-8-EGCG and Cr(VI) was a spontaneous, exothermic, entropic decrease process.
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Advanced Materials Interfaces
·
2018
·Vol. 5
·期 18
·1800630
·
IF 4.834
Xin Lai,Dan Sun,Yi Hou,Yi Zuo,Yubao Li,Li Zhang
Developing low-cost and highly efficient adsorbents for the removal of toxic heavy metal ions is the subject of intensive research with the increasingly stringent water pollution control standards. In this paper, three types of amino-functionalized multilayer core–shell mesoporous organosilica nanospheres (MCMONs) are synthesized using an indirect cocondensation method for Cr(VI) removal applications. Results show that amino groups are successfully immobilized on the nanospheres and these amino-functionalized MCMONs exhibit unique organic–inorganic multilayer core–shell structures. When used as adsorbent for Cr(VI) removal, the N-(3-trimethoxysilylpropyl)diethylenetriamine functionalized MCMONs exhibit a maximum adsorption capacity of 279.92 mg g −1 at initial Cr(VI) concentration of 150 mg L −1 . This is about 20% greater than the highest Cr(VI) adsorption capacity previously reported for other core–shell silica-based adsorbents, demonstrating the great potential of MCMONs in Cr(VI) removal applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Shuang Li,Te Wei,Guojuan Ren,Fang Chai,Hongbo Wu,Fengyu Qu
A simple and highly practical colorimetric method has been proposed for detection of chromium ions (Cr 3+ and Cr 6+ ) synchronously by sodium hyaluronate functionalized gold nanoparticles (SH-AuNPs). The SH-AuNPs were synthesized and characterized by UV–vis spectra and transmission electron microscopy (TEM). The colorimetric response of Cr 3+ and Cr 6+ can be performed simultaneously by the same probe SH-AuNPs, based on the property of special localized surface plasmon resonance (LSPR). The interaction between chromium ions and sodium hyaluronate causes rapid aggregation of the SH–AuNPs conjugates and a concurrent color conversion from wine red to blue gray which is clearly detectable by the naked eye. By using SH-AuNPs as colorimetric probe, the color change with 3 μM Cr 3+ , 1 μM Cr 6+ , or 10 μM mixed chromium ions can be recognized easily by naked eye with highly selectivity. The detection limit calculated by the linear relationship of LSPR were at 0.78 nM (for Cr 3+ ), 2.90 nM (Cr 6+ ) and 0.69 nM (mixed chromium ions) respectively, which were all below the guideline value set by World Health Organization (0.962 μM). The practical applicability of the SH-AuNPs was also verified by the detection of chromium ions in natural lake water samples.
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危险品化学品经营许可证（带存储）