APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Ruijie Che,Yubo Pan,Yining Zhu,Xiaojing Long,Jining Li
Visible-light purification of contaminated waters is often constrained by rapid charge recombination and strong matrix interference, especially in complex real wastewaters. Here, we upcycled rice-noodle waste into carbon quantum dots (CQDs), and integrated them with ZnIn 2 S 4 to construct three-dimensional CQDs/ZnIn 2 S 4 nanoflowers. Optimising the CQDs loading at 3 wt% enabled the composite to remove 50 mg L −1 of pollutants within 120 min under visible irradiation, achieving 99.3% Cr(VI) reduction and complete methylene blue (MB) degradation with apparent first-order rate constants of 0.0192 min −1 (Cr(VI)) and 0.0223 min −1 (MB). The photocatalyst resisted matrix inhibition, with removals reaching 93.1% (Cr(VI)) and 91.6% (MB) in wastewaters, and above 95% in tap, lake and river waters; catalytic activity was retained above 95% after five reuse cycles. Valence-band X-ray photoelectron spectroscopy (VB-XPS) and density functional theory (DFT) band alignment analysis, together with transient photocurrent response, electrochemical impedance spectroscopy (EIS), photoluminescence (PL)and electron paramagnetic resonance (EPR) and radical-trapping experiments collectively verified an S-scheme CQDs/ZnIn 2 S 4 heterojunction with an interfacial built-in electric field that drives vectorial charge separation and preserves highly reductive electrons and oxidative holes at spatially distinct sites. This waste-to-resource strategy couples low-cost carbon precursors with interfacial band engineering to deliver a scalable, visible-light-driven platform for simultaneous detoxification of inorganic (Cr(VI)) and organic dye pollutants in realistic treatment scenarios.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·122126
·
IF 7.5
Xiaojie Zhang,Keyi Liu,Zihan Zhang,Hong Peng,Yuefa Gong
Efficient and simultaneous removal of chromium(VI) oxyanions and heavy metal cations from complex electroplating rinse wastewater remains a major challenge. In this study, polyethyleneimine-chitosan/imidazolium-polysulfone composite beads (denoted as CSPF) were fabricated by integrating polyethyleneimine-modified chitosan powder (CSPI) with imidazolium-functionalized polysulfone (IMPSF) via a phase inversion method. The resulting CSPF beads was applied to simultaneously remove Cr(VI) and Cu(II) from simulated electroplating rinse wastewater. In a single-metal system at pH 5, CSPF exhibited maximum adsorption capacities of 89.3 mg g −1 for Cu(II) and 251.4 mg g −1 for Cr(VI). In the Cr(VI)/Cu(II) binary system, a notable co-removal synergy was observed, with adsorption capacities of CSPF increasing by 193.3% for Cu(II) and 39.7% for Cr(VI) compared to the single-metal system. The presence of other coexisting inorganic anions further significantly enhanced the adsorption of Cu(II) by CSPF. The promotion effect of different anions on Cu(II) adsorption follow the order of HCrO 4 − > H 2 PO 4 − ≈ SO 4 2 − >> NO 3 − ≈ Cl − . This trend is consistent with the extent to which they elevate the final solution pH and Cu 2p 3/2 binding energy after adsorption, and is further confirmed by DFT calculations. These results indicate that a unique electrostatic shielding–proton transfer synergistic mechanism is the key factor responsible for the synergistic co-removal of Cu(II) and Cr(VI) from complexed wastewater. Column cycling experiments demonstrated that CSPF could continuously and efficiently remove both Cu(II) and Cr(VI) from the simulated electroplating rinse wastewater, along with good reusability.
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POLYHEDRON
·
2026
·
IF 2.8
Meng Lan,Yubo Zhang,Xiaoli Dong,Nan Zheng
The development of flexible membrane-shaped photocatalysts with superior catalytic activity for the treatment of heavy metals in wastewater is of great significance, but it remains an extremely large challenge. In this work, atom co-sharing BiOBr/Bi 2 S 3 Z-scheme heterostructures were constructed in situ on flexible carbon fiber cloth substrate by combining solvothermal and ion exchange method. The prepared CFC/BiOBr/Bi 2 S 3 membrane-shaped photocatalyst exhibits good flexibility, water permeability and retrievability. After adsorption for 1 h and visible-light irradiation for 60 min, controllable and optimized synthesized CFC/BiOBr/Bi 2 S 3 –2 shows exceptional activity towards hexavalent chromium with the removal efficiency of 91%. The excellent reduction performance is attributed to the individual charge transport path of Z-scheme, which provides the driving force for photocarriers transport and excellent redox ability. In addition, the tight interfacial contact between BiOBr and Bi 2 S 3 by sharing bismuth atoms allows for rapid charge transfer and accelerates photogenerated carrier separation. This study provides some constructive insights for developing an immobilized membrane-shaped photocatalyst with excellent photocatalytic activity and easy recovery to treat chrome-containing wastewater, which has a promising application in the field of water remediation.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121761
·
IF 7.5
Bingkun Liu,Juncheng Guo,Siyuan Chen,Yinhan Yang,Beibei Liu,Hongda Huang,Jingtao Zhang,Yonghui Zhang
Highly efficient charge migration and separation are critical for the design of high-efficiency and stable photocatalysts. In our work, novel 2D/2D/2D g-C 3 N 4 /Ti 3 C 2 /SnS 2 heterojunctions were successfully prepared via a simple hydrothermal route combined with electrostatic self-assembly strategy. Compared to single-component (g-C 3 N 4 , SnS 2 ) and binary composite materials (g-C 3 N 4 /SnS 2 , g-C 3 N 4 /Ti 3 C 2 ), the optimized ternary g-C 3 N 4 /Ti 3 C 2 /SnS 2 composite displayed significantly enhanced photocatalytic efficiency and higher kinetic rate constants for the elimination of Cr(VI) and tetracycline (TC). More interestingly, further improved photocatalytic performance was achieved when the composite catalyst was applied to the mixed Cr(VI)/TC pollutant system, with the reaction rate constants being 1.46-fold and 1.06-fold higher than those of single Cr(VI) and single TC systems, respectively. Finally, a Z-scheme charge migration pathway was proposed in the 2D layered g-C 3 N 4 /Ti 3 C 2 /SnS 2 heterojunction, which enabled the expedited electron transfer between g-C 3 N 4 and SnS 2 with Ti 3 C 2 as an electron mediator and boosted the charge separation efficiency. The present work provides a viable way for constructing 2D/2D/2D Z-scheme heterojunction photocatalytic materials, offering great potential for the treatment of complex pollutants in wastewater.
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高影响因子
ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Dong Zhang,Danli Zhou,Li Lu,Ming Zhang,Ting Lü,Jingang Huang,Hongting Zhao,Jie Zhou,Jörg Rinklebe
Eradication of heavy metals and dyes simultaneously from wastewater is urgently needed to safeguard public and environmental health . In this study, magnetic porous biochar derived from wasted Myriophyllum aquaticum (MPMaB) was synthesized by KOH-activation and co–precipitation method to treat chromate and rhodamine B (RhB)-bearing wastewater. The KOH activation significantly improved the pore structure of biochar with a high specific surface area of 937.1 m 2 g −1 . The sorption performance of MPMaB for Cr(VI) and RhB in single and co-solutes conditions was evaluated. In single system, a pH-dependent sorption pattern for Cr(VI) by MPMaB was revealed and the estimated sorption capability reached 175.4 mg g −1 , whereas the Langmuir-based sorption capacity of RhB was 175.4 mg g −1 pH-independently. MPMaB partially transformed Cr(VI) to less toxic Cr(III) (approximately 59.3%). Synergistic sorption of Cr(VI) with the coexistence of RhB was observed, where synergistic effect ranged from 119% to 527% depending on pH. For example, the sorption capacity of Cr(VI) on MPMaB, at pH 2, augmented from 175.4 mg g −1 (single system) to 208.3 mg g −1 (binary system). Preferential sorption of Cr(VI) was found and was further confirmed by the post-sorption of Cr(VI) (or RhB) by MPMaB pre-sorbed with RhB (or chromate). Chromate sorption mechanisms mainly include electrostatic interactions and complexation, while the sorption of RhB is ascribed to π–π interactions, pore filling and hydrogen bonding. Additionally, MPMaB showed excellent reusability and maintained high removal efficiency after 5 cycles. In short, MPMaB can efficiently treat chromium and dyes–containing wastewater as sustainable and environmentally friendly adsorbent.
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高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Mingxin Li,Hongling Dai,Peng Zhan,Chaoqun Tan,Zhihui Ning,Fengping Hu,Xing Xu,Xiaoming Peng
Rapid reduction of aqueous Cr(VI) to Cr(III) with waste biomass N-doped lignin charcoals (PLCNx) as a catalyst via mediate oxalic acid (OA) for hexavalent chromium wastewater. The experiment results showed that the PLCN20 composite had the greatest capacity for removing Cr(VI), and the removal rate of Cr(VI) kept higher than 98% when the addition of 5 mM OA in the system. The bubble-shaped structures of PLCNx could act as an electron shuttle mediating the electron transfer and participate in the reduction of Cr(VI), and the N vacancies defects and graphitic N on its surface were a premise for initiating the Cr(VI) reduction process. More importantly, the formation of the Cr(VI)-OA complex facilitated electron transfer as well, which significantly enhanced Cr(VI) reduction. The combined effects of the electron-donating ability of OA and the catalysis of Cr(VI)-OA complex, lead to the enhancement of Cr(VI) reduction on the PLCNx. This work not only offers novel insights into the synthesis of a superior high-efficiency heterostructure for catalyst but also proposes one new mechanism of PLCNx activate OA enhanced catalysis capacity, which helps design and optimize the catalyst process.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jing Liao,Yuke Wu,Xueshan Chen,Huimin Yu,Yao Lin,Ke Huang,Jinyi Zhang,Chengbin Zheng
Hexavalent chromium (Cr(VI)), a confirmed human respiratory carcinogen, has attracted widespread attention due to its high toxicity and mobility in natural water systems. However, the developed catalytic colorimetric probes for Cr(VI) detection remain challenging, such as various species of Cr(VI) coexisting in water or acid buffer, the obvious interference from oxidizing ions at acidic pH, the synthesis of complex materials, and the consumption of hydrogen peroxide. In this work, a phenomenon of UV light-triggered chromate to produce singlet oxygen under neutral pH was found. An environmentally-friendly method based on the rapid oxidation of chromogenic substrates was thus developed for the highly specific and accurate detection of Cr(VI). Cr(VI) serves as both the active center and the target of this system, which ensures the rapidity, simplicity, and environmental protection of the proposed colorimetric strategy. Importantly, the neutral catalytic condition ensures that the predominant species CrO 4 2- can be accurately quantified and avoids the interference of oxidizing ions. Subsequently, a portable analytical system integrating an array of LED lamps, a miniature color reading device, and a developed smartphone-based program was successfully developed to accomplish high-throughput and on-site analysis of Cr(VI) in natural water. The proposed method provides a rapid screening and water quality assessment tool for the faster, more cost-effective, and accurate detection of Cr(VI) in the water system.
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CHEMOSPHERE
·
2022
·
IF 8.943
Jun Hou,Yan Li,Hanlin Ci,Lingzhan Miao,Guoxiang You,Jun Wu,Yi Xu
Aggregation behaviors of bare, and sodium polyacrylate (PAA) and starch modified zero-valent-iron nanoparticles (nZVI), as well as their effects on the Cr (VI) removal were investigated by simulating the groundwater. Results showed that increased concentration of PAA (1–6 wt%) and starch (0.1–0.6 wt%) alleviated the aggregation of modified nZVI (abbreviated as P-nZVI and S-nZVI), while there was an optimum dosage of 4 wt% PAA and 0.3 wt% starch for the Cr (VI) removal, respectively. Moreover, as one of the fundamental water chemistry parameters, Ca 2+ (0, 5, and 10 mg L −1 ) greatly promoted the aggregation of modified nZVI, and decreased the Cr (VI) removal efficiency by them via forming bidentate bridging structure (between Ca 2+ and PAA) or complexes (between Ca 2+ and starch). Additionally, fulvic acid (FA) (0, 2, 5, and 10 mg L −1 ) decreased the Cr (VI) removal by P-nZVI because of the significantly improved electronic repulsion. However, FA enhanced the aggregation of S-nZVI, but diminished its performance on Cr (VI) removal due to the bridging effect between FA and starch. The present study was of great importance in predicting the migration of nZVI and contaminants removal under complex geological conditions in groundwater.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Chong Xu,Fan Yang,Bijian Deng,Sai Che,Wang Yang,Ge Zhang,Yankun Sun,Yongfeng Li
A novel photocatalyst of rGO-wrapped Ti 3 C 2 /TiO 2 nanowires ((Ti 3 C 2 /TiO 2 )@rGO) was successfully synthesized to remove hexavalent chromium (Cr(VI)) and Rhodamine B (RhB) from wastewater. Among the prepared photocatalysts, (Ti 3 C 2 /TiO 2 )@rGO-15 showed the highest photocatalytic activity in both single and mixed pollutant solutions. The excellent photocatalytic activity was ascribed to the enhanced separation efficiency of e - and h + resulted from the Schottky barrier established in (Ti 3 C 2 /TiO 2 )@rGO. Ti 3 C 2 gathered the stimulated electrons originated from TiO 2 and further transferred them to rGO , thus enhancing the separation efficiency of e - and h + . Furthermore, different scavengers were employed to determine the reactive species involved in the photocatalytic reaction system. This work may provide a promising way to promote the separation efficiency of e - and h + via appropriate incorporation of co-catalyst.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 15
·8963-8969
·
IF 3.361
Zhiying Li,Congshu Li,Huiyun Yan
Designing exceptional probes to detect minute quantities of chromium(VI) is of huge importance for the safety and health of the human race. In this study, a green fluorescence emission probe (polyethylene Schiff base-chelated Fe2+ complex) was synthesized by a one-pot synthesis method for the highly selective and sensitive detection of Cr(VI) in an aqueous solution. The complex of polyethylene Schiff-Fe2+ was fully characterized, and it displayed satisfactory stability in the aqueous solution. The fluorescence emission could be quenched specifically by the introduction of Cr(VI) via the oxidation of the Fe2+-centered polyethylene Schiff base complex. The fluorescence intensity decreases linearly with the concentration of Cr(VI), and the corresponding detection limit was calculated to be 0.18 μM. Thus, the obtained fluorescence detection system could be used for Cr(VI) detection in tap water. These features provide potential uses of the as-prepared polyethylene Schiff-Fe2+ complex as a sensor for environmental applications.
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高影响因子
RSC Advances
·
2020
·Vol. 10
·期 53
·32249-32258
·
IF 3.119
Fengli Liu,Huosheng Li,Dandan Liao,Yanhong Xu,Mingxia Yu,Shengwen Deng,Gaosheng Zhang,Tangfu Xiao,Jianyou Long,Hongguo Zhang,Yuting Li,Keke Li,Ping Zhang
Carbon quantum dots (CQDs) were synthesized via a hydrothermal method, in which extracellular polymeric substance (EPS) from anaerobic ammonium oxidation (anammox) granular sludge was used as a carbon precursor, while citric acid and ethylenediamine were applied as auxiliary carbon source and passivation agent, respectively. The synthesized CQDs, with orderly spherical shape and mean size of 7.15 nm, emitted blue fluorescent light under UV radiation of 365 nm. The CQDs had a high fluorescence yield (40.84%), with good water solubility and excellent spectroscopic properties. In addition, the CQDs exhibited selective, sensitive and distinctive fluorescence quenching behaviors for Cr(VI) and Mn(VII) in a PBS buffer solution (NaH2PO4–Na2HPO4) of pH 7, with a detection limit of 5.8 nM for Cr(VI) and 2.3 nM for Mn(VII). Owing to the nitrogen components from the EPS of anammox granules, the CQDs were well nitrogen-doped, promoting electron-transfer and leading to reduction between the CQDs and Mn(VII)/Cr(VI). These results indicate that CQD-based chemical sensing is a simple and efficient means for the fluorescence detection of Mn(VII) and Cr(VI).
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Lixun Zhang,Fangxin He,Wei Mao,Yuntao Guan
It is still a great challenge to find an eco-friendly, easy-to-synthesize, and cheap adsorbent to rapidly remove Cr(VI) to ppb level in the Cr(VI)-polluted water. Herein, a new layered double hydroxide nanocage intercalated with diethyldithiocarbamate (DDTC-LDH) was fabricated via a facile calcination-rehydration method. The DDTC-LDH rapidly decreased Cr(VI) concentration from 5 to <0.05 mg/L within 35 min, and only a few seconds were required to completely remove it at an initial concentration of 0.5–1 mg/L, primarily attributed to the effective adsorption-reduction of Cr(VI) to Cr(III) by sulfur atoms in C S and C S groups. Attractively, the generated Cr(III) was also quickly removed to below 0.1 mg/L via an opportune Lewis hard-hard interaction with C–SO x groups produced through C S oxidation. Additionally, Cr(VI) could be removed by DDTC-LDH at a wide pH application range (3.17–10.78) and with weak effects by coexisting anions (Cl − , NO 3 − , CO 3 2− , SO 4 2− , and PO 4 3− ). We systematically analyzed and proposed the mechanisms for Cr(VI) removal by the DDTC-LDH, orderly containing electrostatic attraction, Cr(VI) complexation by sulfur atoms in C S and C S groups, reduction of the Cr(VI) to Cr(III) by the C S and C S groups, and Cr(III) complexation by sulfur atoms in C–SOx groups. Our results provide new insights into the Cr(VI) removal using organosulfur compounds , that is to say, the organosulfur group Lewis hardness increased (from C–S to C–SOx) as the Cr species Lewis hardness increased (from Cr(VI) to Cr(III)), so as to opportunely ensure fast and efficient capture of both Cr(VI) and Cr(III) via Lewis acid-base interactions.
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高影响因子
危险品化学品经营许可证（带存储）