MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2022
·
IF 4.644
Meng Tan,Qiaoyuan Gao,Yangjie Fu,Youran Xu,Derek Hao,Bing-Jie Ni,Qi Wang
In this study, a new coordination polymer of Fe-2-methylimidazole (Fe-2MI) was successfully loaded onto F-doped tin oxide (FTO) via a one-pot solvothermal method, using Fe(NO 3 ) 3 and 2MI as raw materials. For X-ray diffraction patterns (XRD) and scanning electron microscope (SEM) analysis, it can be deduced that Fe-2MI assembles were evenly dispersed on the surface of FTO, and were partially encapsulated by tiny FeOOH particles. The as-prepared Fe-2MI film electrode was used as photoanode with titanium sheet (Ti) as the cathode. Simultaneous photoelectrocatalytic (PEC) removal of phenol and Cr(VI) can be effortlessly accomplished under noticeable light illumination. Meanwhile, the impact of initial Fe state was also investigated. Fe-2MI prepared with Fe(III) behaved better PEC performance than that with Fe(II). Furthermore, the Fe-2MI photoanodes were optimized by adjusting the initial concentration of Fe(III) and 2MI precursors. Besides, the application conditions were optimized at acidic pHs and 2.5 V bias voltage . Cr(VI) can be completely reduced with 80% removal of phenol after 5 h PEC reaction. After 5 successive cyclic runs, stable photocatalytic performance can still be observed. Therefore, Fe-2MI coordination polymer can be a promising candidate for preparing visible-light-active photoanode in the application of environmental remediation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yuting Long,Hong Li,Wenbo Wang,Xinxin Yang,Zirui Liu
Ultrasensitive detection of highly toxic Cr(VI) is of paramount importance as trace amount of Cr(VI) will result in inevitable deterioration to human health and the environment. In this work, a novel methimazole-functionalized SERS optical fiber probe was used for the first time for Cr(VI) determination with ultrahigh sensitivity. A special functionalization process of methimazole was designed after successful fabrication of silver coated fiber probe via a SnCl 2 -sensitized solvothermal method. Dual functional methimazole guaranteed ultrahigh sensitivity and good stability of the SERS fiber probe for Cr(VI) detection. On one hand, methimazole functions as a Raman reporter which exhibits SERS peak intensity decline in the presence of Cr(VI). On the other hand, methimazole acts as an oxidation inhibitor via coordinating with silver atoms through the lone pair of nitrogen and sulfur atoms. The optimized SERS fiber probe not only presents good stability and excellent reproducibility, but also exhibits ultrahigh sensitivity (10 −11 M) which exceeds SERS or other techniques for Cr(VI) determination reported so far.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yan Yi,Xiangyu Wang,Yaxian Zhang,Jun Ma,Ping Ning
The aquatic plant Egeria najas based biochar was innovatively constructed by modifying it with Fe 2 (SO 4 ) 3 (Fe 2 (SO 4 ) 3 @EN-BC) for Cr(VI) removal. The characterizations of Fe 2 (SO 4 ) 3 @EN-BC confirmed that Fe 2 (SO 4 ) 3 was attached to biochar in form of Fe 2 O 3 after hydrolysis and calcination under high temperature. The results showed that Fe 2 (SO 4 ) 3 @EN-BC had a high removal efficiency of Cr(VI) with approaching 99.88%, which was about 7 times higher compared to unmodified biochar (EN-BC). Batch experiments of Cr(VI) removal included initial concentration, reaction temperature, solution pH and kinetics were conducted. The adsorption kinetics could be more accurately explained using pseudo-second order kinetics model , indicating the chemical adsorption controlled the reaction process. According to the Langmuir model, the maximum adsorption capacities for Cr(VI) were 138.79, 159.36 and 190.91 mg/g at 298, 313 and 333 K, respectively. Moreover, based on FTIR and XPS results, the Fe 2 (SO 4 ) 3 @EN-BC surface was loaded with many functional groups conducive to Cr(VI) adsorption. The main removal mechanisms of Cr(VI) by Fe 2 (SO 4 ) 3 @EN-BC included adsorption and reduction, and the percentage of Cr(VI) removed by adsorption and reduction were 19.1% and 80.9%, respectively.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Jun Jiang,Zhidong Chen,Peng Wang,Pei-Yang Gu,Jiadi Liu,Zhuzhu Zhang,Qingfeng Xu
At present, hexavalent chromium (Cr(VI)) has a serious impact on the water environment and human beings since it can be easily absorbed by the human body, lethal to aquatic organisms and carcinogenic to humans. Based on this, a black hollow TiO 2 nanotube supported polydopamine (PDA)@Ag 2 S composite photocatalytic material was prepared, which can be used for the efficient photocatalytic reduction of Cr(VI) in wastewater. Both black hollow TiO 2 and Ag 2 S have the shortcoming of undergoing ready recombination of photogenerated carriers. The introduction of PDA can not only improve the photogeneration of composite photocatalytic materials, but also broaden the absorption range in the visible-light region. A detailed mechanism for the TiO 2-x @PDA@Ag 2 S photocatalytic system has been proposed at the same time. This work provides a new methodology for the design and synthesis of sandwich organic-inorganic hybrid photocatalytic materials.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Longwen Li,Lin Chi,Hongxu Zhang,Shuming Wu,Han Wang,Zhimin Luo,Yanwei Li,Yanhui Li
This article prepared a nanoparticle (NP) Ti-PDA made from bis (2-hydroxy propionic acid) diammonium titanium hydroxide (Ti-BALDH) chelating dopamine (DA), as a photocatalyst to absorb and reduce hexavalent chromium (Cr(VI)) under visible light with recycling ability from waste water. Ti-PDA NPs with part of TiO 2 -like structure can perform some function of TiO 2 , while participation of PDA will not only broaden absorption spectrum from UV to visible light, but offer the ability to absorb Cr(VI). Compared with TiO 2 Ti-PDA NPs would make full use of sunlight, increasing the photocatalytic efficiency. The adsorption results of Ti-PDA NPs for Cr(VI) showed that the adsorption capacity of Ti-PDA NPs can reach 500.24 mg/g when the concentration of Cr(VI) was 300 mg/L, and the adsorption data matched well with the Langmuir isotherm model, and confirmed to a quasi-second-order dynamics. Under visible light irradiation, Ti-PDA NPs could reduce Cr(VI) to Cr(III) within 30 min, and can almost completely reduce Cr(VI) within 15 min even at pH = 4. After three cycles, photocatalytic reduction efficiency was still 95.02%. Thereby the toxic Cr(VI) can be effectively eliminated by Ti-PDA NPs from sewage. As a result, Ti-PDA will be a promising green photocatalyst to remove Cr(VI) in disposal of water pollution.
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WATER AIR AND SOIL POLLUTION
·
2026
·Vol. 237
·期 22
·1293
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IF 3.5
Li Xi,Zhang Luyao,Liu Ling,Yan Yunxia,Wang Ziqing,Wang Bing
Soil co-contamination by organic pollutants and toxic metals has become an increasingly prominent environmental concern worldwide, largely driven by intensive industrial and anthropogenic activities. In this study, BC-nZVI coupled with three oxidants—persulfate (PS), BS, and hydrogen peroxide (HP)—was evaluated for the simultaneous remediation of BaP and Cr(VI) co-contaminated soil. Among the tested systems, BC-nZVI/BS exhibited the best overall performance, achieving 77.7% BaP removal and 97.6% Cr(VI) reduction, followed by BC-nZVI/HP and BC-nZVI/PS. Among the three systems, the BC-nZVI/BS system maintained comparatively stable remediation performance over the tested pH range. Coexisting Cr(VI) exerted a pronounced synergistic effect on BaP degradation in the BC-nZVI/BS system, likely via promoting oxidant activation. Six classes of intermediates with simpler structures than BaP were tentatively identified, indicating the progressive transformation of BaP during the remediation process. Post-treatment characterization revealed the presence of Cr 2 O 3 , FeCr 2 O 4 , and Cr(OH) 3 , suggesting that Cr(VI) was predominantly removed through reductive precipitation to Cr(OH) 3 . Overall, the BC-nZVI/BS system showed promising potential for the remediation of BaP-Cr(VI) co-contaminated soils.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
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IF 5.9
Rui Xi,Jiayan Zhou,Beibei Jiang,Qi Zhang,Kunkun Zhu,Weilin Xu,Dengpeng Song
Biomass adsorbents have received extensive attention for the removal of heavy metals , but most of them had very limited adsorption capacity or needed to be modified with environmentally unfriendly chemicals to achieve acceptable performance. In this study, a green biomass adsorbent was fabricated using an abundant natural cellulosic Juncus effusus (JE) fiber and natural melanin polydopamine (PDA) through a simple mussel-inspired polymerization strategy. JE's unique hollow three-dimensional network structure provided an ideal scaffold substrate with abundant sites for dopamine polymerization deposition. This enabled the modified PDA@JE fibers to be rich in amino, hydroxyl, and other active adsorption sites, thereby endowing the PDA@JE fiber adsorbent with a promising Cr (VI) adsorption capacity of up to 145.8 mg / g. This capacity was significantly higher than that of most previously reported biomass-based adsorbents. Furthermore, 10–20 times the concentration of common interfering ions such as Ca 2+ , Cd 2+ , Cu 2+ , NO 3 - , Cl - , SO 4 2- and PO 4 3- had little effect on the adsorption efficiency. This study provided a green and general mussel-inspired strategy for preparing effective biomass adsorbent, offering a promising approach for utilizing natural cellulosic fibers in eco-friendly applications.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 99
·期 2
·415-425
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IF 3.4
Mingliang Chen,Guanghui Wang,Jialing Dai,Haifeng Li,Nansheng Deng
BACKGROUND There is increasing concern regarding the rising issue of Cr(VI) pollution in aqueous solutions. It is crucial to find an effective technology for the removal of Cr(VI) in aqueous solutions. In this work, a novel TiO 2 /BC/g-C 3 N 4 heterostructure photocatalyst was successfully prepared by a simple hydrothermal method and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller analysis, Fourier transform infrared spectroscopy, photoluminescence, ultraviolet–visible diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The photocatalytic reduction behavior of Cr(VI) on the TiO 2 /BC/g-C 3 N 4 heterostructure was investigated under visible light irradiation, and the possible mechanism of photocatalytic reduction of Cr(VI) was elucidated. RESULTS The TiO 2 /BC/g-C 3 N 4 heterostructure photocatalyst exhibited better photoreduction activity for Cr(VI) under visible light irradiation. After 100 min irradiation with visible light, the TiO 2 /BC/g-C 3 N 4 photocatalyst achieved a removal efficiency of 89% for Cr(VI). Compared with TiO 2 , TiO 2 /BC and TiO 2 /g-C 3 N 4 , the photocatalytic removal efficiency of Cr(VI) on the TiO 2 /BC/g-C 3 N 4 increased by 40%, 20% and 10% respectively. The photocatalytic reduction of Cr(VI) was dependent on the initial concentration of Cr(VI), catalyst dosage, pH value and atmosphere. Moreover, TiO 2 /BC/g-C 3 N 4 presented excellent stability and reusability after five cycles. CONCLUSION The TiO 2 /BC/g-C 3 N 4 heterojunction enables highly efficient photocatalytic reduction of Cr(VI) under visible light irradiation. This enhancement is primarily attributed to the construction of an indirect Z-scheme TiO 2 /BC/g-C 3 N 4 heterojunction, which significantly improves the separation efficiency of photo- generated charge carriers during the photochemical process. Furthermore, the presence of BC enhances the adsorption performance of Cr(VI) on TiO 2 /BC/g-C 3 N 4 , thereby facilitating its photocatalytic reduction. © 2023 Society of Chemical Industry.
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Sustainability
·
2023
·Vol. 15
·期 18
·13560
·
IF 3.9
Yuan Zhao,Jie Gao,Tian Liang,Tao Chen,Xiaobing Han,Guowen Hu,Bing Li
Biochar is considered to be the most promising substrate for the preparation of environmentally functional materials. The modification of bamboo char can significantly improve the removal rate of toxic ions from wastewater; however, there are few reports that focus on the radiation grafting method. Here, glyceride methacrylate (GMA) is successfully grafted onto bamboo char through electron beam radiation, followed by amination using the existing epoxide group in diethyltriamine, and finally, treated with hydrochloric acid to obtain protonated diethyltriamine-functionalized bamboo char (CDGBC). The results of IR, TG, XRD, and SEM prove the successful fabrication of a CDGBC biosorbent. The results show that the solution pH has a great effect on the adsorption capacity, and a maximum adsorption capacity of 169.13 mg/g is obtained at pH = 2 for Cr(VI). In addition, the adsorption behavior of Cr(VI) onto CDGBC is demonstrated to obey the pseudo-second-order kinetic and Freundlich isotherm models, and thermodynamic analysis exhibits that Cr(VI) adsorption is an endothermic spontaneous process. A possible adsorption mechanism based on the electrostatic interaction, reduction, and surface complexation is proposed, according to the obtained results. This work confirms that radiation-induced grafting modification can effectively transform biochar into a high-performance adsorbent for Cr(VI) removal, offering a new approach to synthesizing an efficient biosorbent.Keywords:bamboo char;radiation-induced grafting;Cr(VI);adsorption;mechanism
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Yuecheng Zhang,Chengjia Li,Lingbo Sun,Jie Zhang,Xiaojun Yang,Hongyan Ma
Hexavalent chromium ion (Cr(VI)) is one of the most severe environmental nonbiodegradable pollutants. Considering its high biological toxicity, it is of great significance to establish a method for Cr(VI) analysis with high sensitivity and reliability. Therefore, a simple and sensitive ratiometric sensor is developed according to the coordination between Cr(VI) and carbon dots (CDs). In the presence of Cr(VI), the original CDs photoluminescence (PL) emission at 445 nm was significantly shifted to 565 nm and gradually intensified. The coordination mechanism was investigated, the results indicated that the dual-amino groups at ortho-position of benzene ring is critical for this coordination. Under the optimal condition, a good linear relationship between the concentration of Cr(VI) and the PL intensity ratio I 565 /I 445 was obtained from 120 nM to 200 µM, with a low detection limit of 37 nM. Moreover, this method is applied into real water samples analysis with a high quality.
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CHEMOSPHERE
·
2021
·
IF 7.086
Fenglei Liu,Shan Hua,Chao Wang,Muqing Qiu,Limin Jin,Baowei Hu
Herein, a potential bio-adsorbent (DACS-CA) was formed via immobilizing caffeic acid (CA) on dialdehyde corn starch (DACS) for Cr(VI) removal. The characterization techniques such as IR, Raman, XPS and 13 C NMR were performed to analyze surface elements and functional groups on the as-prepared sorbents . Batch experiments revealed that the maximum Cr(VI) removal amount (96.45 mg/g) took place at a pH value of 3.0, adsorption temperatures of 333 K and solid-liquid ratio of 0.2. The isotherms studies found that the Cr(VI) removal of DACS-CA was monolayer adsorption, while the kinetics analysis revealed that chemisorption was the main power for removal process. Characterization analysis found that about Cr(VI) (53.02%) and Cr(III) (46.98%) species co-existed onto the surface of DACS-CA, which implied that a redox reaction may be occurred between Cr(VI) and the bio-adsorbent. Namely, Cr(VI) was first loaded on DACS-CA via electrostatic interaction, subsequently Cr(VI) was partially transformed into Cr(III) by reductive functional groups, meanwhile the resulting Cr(III) was immobilized by the carboxyl groups of DACS-CA. Thus, this bio-adsorbent could serve as an efficient sorbent for the removal of Cr(VI) from wastewater in environmental pollution cleanup.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Tao Li,Lin Dai,Yixin Huang,Siwen Pan,Zijun Pang,Jing Zou
Nowadays, a number of spectrophotometric methods for Cr(VI) determination have been developed. Whereas most of them are sensitive to pH, metallic ions, temperature, etc, which render them out of feasibility and may result in erroneous measurement. Therefore, to overcome these drawbacks, a new spectrophotometric method with rapid detection, high accuracy and strong anti-interference ability was established. This method is based on the oxidative coloration of N,N -diethyl- p -phenylenediamine (DPD) and Cr(VI) to generate pink-colored DPD •+ radicals which showed maximum absorbance at 551 nm. Accordingly, different reaction parameters were optimized, the calibration curves (linear range 0.85–60 µM) were established with a high sensibility of (3.05 ± 0.02) × 10 4 M −1 cm −1 . The LOD and LOQ were determined to be 0.26 µM and 0.85 µM respectively, accompanied with a stoichiometric coefficient of near 1:3 (1:2.78). The DPD method exerted a satisfactory accuracy in natural water samples and a pretty good anti-interference performance towards various common co-existing metallic ions. Moreover, this method was successfully applied in the Cr(VI)-sulfite and Cr(VI)-hydroxylamine systems. Overall, the study highlights the DPD method as a promising approach for the Cr(VI) determination and provides a new perspective for the practices of spectrophotometry .
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