MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Z.H.A.O.-X.U.A.N. Jiang
In this investigation, UiO-66-NH 2 was effectively synthesized through a solvothermal approach, utilizing benzoic acid and hydrochloric acid (HCl) as modulating agents. This synthesis process intentionally introduced defects mediated by benzoic acid, and the degree of these defects was precisely adjusted by the concentration of HCl. Subsequently, the material underwent a covalent modification process through an amidation reaction, resulting in the attachment of tetrakis (4-carboxyphenyl) porphyrin (TCPP). The results demonstrated a significant improvement in the photocatalytic reduction of Cr(VI), showcasing a 125 % elevation in reduction efficiency as compared to the unmodified UiO-66-NH 2 material serving as the baseline. The performance enhancement is due to the synergistic effect of the defect structure and TCPP modification, which enhances the light absorption, promotes charge transfer and separation, reduces the recombination rate, and improves the adsorption capacity and light absorption efficiency of Cr(VI). This research introduces an innovative approach and a highly effective catalyst, offering a novel solution for modifying metal-organic frameworks (MOFs) and enhancing their photocatalytic performance in the reduction of Cr(VI).
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Surfaces and Interfaces
·
2024
·
IF 5.7
Jiaqi Ma,Linkun Fan,Xusheng Wang,Lan Li,Yiming Zhang,Guixia Zhao,Bo Chai,Junkuo Gao
Cr(VI) stands as a profoundly toxic chemical and photocatalysis technology has shown promising potential in photocatalytic reduction of Cr(VI) to Cr(III), where the reduced Cr(III) is less toxic and can be further precipitated in a wide pH range. Metal-organic frameworks (MOFs), as emerging class of porous coordination polymers, is expected to be ideal platform for photocatalysis. In this study, defect engineering on MOFs was applied to promote photoreduction of Cr(VI). The obtained oxygen vacancy-containing MIL-125-NH 2 samples showed modified electron structure, adjusted surface and porous properties, and enriched active sites. Among these oxygen vacancy-containing MIL-125-NH 2 samples, the 300-M (MIL-125-NH 2 heated at 300 °C for 2 h under N 2 atmosphere) displayed the most remarkable performance in terms of photocatalytic Cr(VI) reduction. The pronounced efficacy of 300-M is evident from the achieved removal rate of Cr (VI), reaching an impressive 98 % in just 20 mins (19.6 mg Cr(VI) g −1 cata min −1 ), in stark contrast to MIL-125-NH 2 , which exhibited a modest removal rate of 53 %. Remarkably, the k-value for 300-M is 5.1 times that of MIL-125-NH 2 , further underscoring the superior efficiency of 300-M. The photoreduction mechanism of 300-M was further substantiated through a battery of advanced characterization techniques including transient photocurrent, electrochemical impedance spectroscopy, fluorescence spectroscopy, the Mott-Schottky analysis, and electron spin resonance. Those results disclosed that oxygen vacancies and mesopores introduced via controlled heat treatment play a pivotal role in facilitating the photoreduction of Cr(VI) within the MIL-125-NH 2 structure. More advanced characterizations for the structures of photocatalysts and the photocatalytic mechanisms including charge transfer path need further studied. The systematic exploration of temperature-dependent effects on material properties opens avenues for future research in designing efficient and versatile MOF-based photocatalysts for environmental remediation applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 23
·22455-22463
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IF 2.8
Wang Pingping,Dong Faqin,Liu Mingxue,He Huichao,Huo Tingting,Zhou Lei,Zhang Wei
Photoelectrochemical process is an environmentally friendly technology and has a wide application in the control of environmental pollutants. Efficient nanophotocatalysts responsive to visible light are still highly attractive. In this work, α-Fe 2 O 3 /TiO 2 were grown on fluorine doped tin oxide (FTO) substrates by hydrothermal method for photoelectrochemical reduction of Cr(VI). Compared with the separate α-Fe 2 O 3 and TiO 2 electrodes, the composite α-Fe 2 O 3 /TiO 2 electrodes show higher photocurrent density. Under visible light irradiation, 100% removal efficiency of Cr(VI) was obtained after 40 min treatment. The composite α-Fe 2 O 3 /TiO 2 electrodes showed an enhanced absorbance in visible light region and had good stability to photoelectrochemical reduction of Cr(VI). The role of hole scavengers (citric acid and oxalic acid) and pH values was systematically investigated. This novel intensification approach provides new insight on the application of photoelectrochemical reduction in environmental remediation.
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PubMed
高影响因子
Journal of Environmental Sciences
·
2025
·
IF 6.3
Yuanyuan Wang,Shijun Jia,Shiqiang Ding,Wenyan Zhang,Rui Shu,Yingfei Hu
Using natural minerals to eliminate harmful Cr(VI) under sustainable sunshine has significant potential. Herein, Palygorskite nanorods were utilized as carriers for the in-situ synthesis of CaIn 2 S 4 photocatalysts through a simple one-pot thermal process, enabling the efficient reduction of Cr(VI). With a Palygorskite to CaIn 2 S 4 mass ratio of 5 %, the conversion rate of Cr(VI) reached 98 % after 60 minutes of visible-light exposure, with a remarkable reaction rate of 0.0633 min −1 . The effective integration of CaIn 2 S 4 with Palygorskite led to a more uniform dispersion of CaIn 2 S 4 , exposing more reactive sites. Moreover, the establishment of a heterojunction between CaIn 2 S 4 and Palygorskite facilitated the transport of photogenerated electrons from CaIn 2 S 4 , enhancing the efficiency of charge separation. These factors contribute to the improved photocatalytic performance. Additionally, the developed composite photocatalysts demonstrated excellent stability under light exposure and could be reused efficiently. Trapping tests on active substances revealed that e − played key roles in the Cr(VI) reduction. This research suggests the potential of using natural minerals to fabricate composite photocatalysts capable of effectively removing pollutants from the environment using solar energy.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Weifang Zhang,Lianyang Huang,LingLing Zhuang,Jiahong Pan,Kun Li,Yu Luo,Chunshan Wu,Menglu Zhang,Chunli Wang
While mechanochemical reactions have garnered attention for their broad applicability and readily attainable operational conditions, their utilization in wastewater purification, particularly for the treatment of chromium-containing effluents, remains limited. In this study, we present a novel mechanism for ball milling-mediated reduction and immobilization of hexavalent chromium, achieving removal efficiencies of up to 93.7% over a pH range of 2.0 to 10.0. This mechanism advocates for the concurrent effect of mechanical force to facilitate the reduction of Cr(VI) to its stable surface form (Cr(III)), and the precipitation of BaCrO 4 , thereby immobilizing the chromium species. Density functional theory calculations demonstrate that oxygen vacancies can efficiently adsorb Cr(VI), thereby imparting electrons to it, consequently facilitating reduction processes. This study provides novel insights into metal ion-contaminated wastewater treatment and the role of naturally generated mechanical forces on the redox processes of chromium species.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 3.8
Xinyu Li,Mingzhao Liang,Zhihong Zhang,Jianfeng Zhang,Jing Liang
The reduction and adsorption of Cr(VI) are critical challenges in environmental remediation. In this study, corn straw modified with polyethyleneimine (PEI-CS) was synthesized as carriers to immobilize Bacillus licheniformis MZ1 (PEI-CS-MZ1), enabling simultaneous Cr(VI) reduction and Cr(III) fixation in a high efficiency. Notably, PEI-CS-MZ1 achieved 95.61 % and 81.96 % Cr(VI) reduction under extreme conditions (pH 8 and 11 % salinity), respectively. Furthermore, this composite completely reduced 100 mg/L Cr(VI) within 24 h while maintaining 76.96 % Cr(III) fixation, which was significantly superior to free MZ1 and PEI-CS. PEI-CS-MZ1 also demonstrated exceptional stability, retaining 89.8 % Cr(VI) reduction after 10 operational cycles. This strategy revealed that Cr(VI) reduction and Cr(III) fixation were accomplished via cooperativity of bio-reduction, chemical reduction, chemisorption, and physical adsorption. This work provides theoretical foundations for designing immobilized microbial systems toward efficient remediation of Cr(VI)-contaminated wastewater.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 4
·1-13
·
IF 2.02
Zhang Lilan,Guo Yali,Iqbal Anam,Li Bo,Deng Min,Gong Deyan,Liu Weisheng,Qin Wenwu
Herein, six kinds of PdNPs (including icosahedron, sphere, spindle, cube, rod, and wire) were synthesized via simple methods. The catalytic activities were investigated by the reduction reaction of Cr(VI) and Suzuki coupling reaction. Chemically synthesized morphologies of the six catalysis were characterized by transmission electron microscopy, field emission scanning electron microscopy, and X-ray diffraction, etc. Pd icosahedron shows a better catalytic property than other PdNPs with a rate constants 0.42 min −1 for the reduction of Cr(VI). Moreover, the electrocatalyst shows that Pd icosahedron possesses a bigger surface area of 8.56 m 2 /g than other nanoparticles, which is attributed to the better catalyst. The Pd icosahedron possesses a better catalytic property, attributing to the abundant exposed {111} facets with high activity on Pd icosahedron. The catalytic activities are closely related to the surface area with the following order: icosahedrons ≥ sphere > rod > spindle > cube > wire. The Pd icosahedron catalyst represents a strong activity for Suzuki coupling reaction as well, outweighting is 80%. The results reveal that Pd icosahedron acts as an efficient catalyst compared to other PdNPs (wire, rod, sphere, spindle, and cube).
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ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Yuchao Zhu,Qiang Wei,Qinyu He,Deyang Chen,Than Zaw Oo,Su Htike Aung,Fuming Chen
Capacitive deionisation (CDI), as a novel electrochemical technology, has attracted a fast-growing research interest over the past years. However, the single function of salt removal limits further development of conventional CDI systems. Herein, we propose a multi-function CDI device, which can achieve the electrochemical desalination, degradation of organic pollutants and removal of heavy metal ions through the redox electrocatalytic deionisation technology. Sulphur-doped reduced graphene oxide (S@rGO) is utilised as the anode to catalyse the degradation of rhodamine B. The Pt-coated graphite paper is used as a cathode for the removal of dichromate ions by the electro-reduction process. The voltage plateau of S@rGO is reduced by ∼0.35 V compared with the pure carbon cloth electrode, indicating the effectiveness of S@rGO as the catalyser. The salt feed is desalted to ∼0.74 mS·cm−1 level at a current density of 1 mA·cm−2. The degradation efficiency of rhodamine B (RhB) and potassium dichromate are 99.1% and 55.3%, respectively. The effects of different current densities and cycling are also investigated. This work is significant for the multi-functional process of water treatment and the device design.Synopsis : The single function of salt removal limits the further development of the CDI system. A multi-function CDI device is proposed to achieve electrochemical desalination, organics degradation and dichromate ion removal.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 5
·2311-2317
·
IF 1.754
Wu Tao,Geng Zilong,Feng Zhengye,Pan Guoxiang,Shen Qiang
The diffusion of Re(VII), Se(IV) and Cr(VI) in compacted Gaomiaozi bentonite was conducted by an integrated diffusion setup. The effective diffusion coefficient and the rock capacity factor of Re(VII), Se(IV) and Cr(VI) were measured. Re(VII) and Cr(VI) were excluded from the surface of bentonite particles with an accessible porosity of 0.40 and 0.23. The geometric factor decreased in a sequence of Cr(VI) < Se(IV) < Re(VII), indicating that Cr(IV) had a lower tortuosity, a larger diffusion pore diameter, and a stronger anionic exclusion effect from the surface of bentonite platelets.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 131
·期 4
·
IF 1.395
Ruihua Huang,Bingchao Yang,Qian Liu,Yanping Liu
Activated carbon/chitosan composite has been used as an adsorbent to remove aniline and Cr(VI) ions from aqueous solutions simultaneously. The effects of preparation conditions such as the ratio of activated carbon to chitosan, crosslinking reagents, crosslinking time, and adsorption conditions including adsorbent dosage, pH value of solution, and contact time on simultaneous adsorption of aniline and Cr(VI) ion were investigated. Experimental results showed that epichlorohydrin was the proper crosslinking reagent, and the ratio of activated carbon to chitosan was kept at 1. When the adsorbent dosage was 4.0 g/L, and the concentrations of aniline and Cr(VI) were lower than 50 and 100 mg/L, respectively, both aniline and Cr(VI) were simultaneously removed at natural pH with high removals (>95%). The presence of Cr(VI) enhanced the adsorption of aniline, while the presence of aniline almost had no influence on the adsorption of Cr(VI). The adsorption processes of both aniline and Cr(VI) followed the pseudo-second-order kinetics model, but the sorption of Cr(VI) was preferential to that of aniline by this composite. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39903.
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NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 38
·期 7
·2911-2916
·
IF 3.159
Er-tao Liu,Huiping Zhao,Hui Li,Guangfang Li,Yunling Liu,Rong Chen
Porous α-Fe2O3 nanostructures with different morphologies, such as rod-like, sphere-like and cube-like nanostructures, were successfully synthesized via a facile hydrothermal method. The obtained products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and nitrogen adsorption. It was found that iron precursors played a crucial role in the formation of porous α-Fe2O3 nanostructures. The porous α-Fe2O3 nanorods possessed largest BET surface area and ideal pore distribution, as well as exhibited excellent Cr(VI) removal capacity and a fast adsorption rate in a wide pH range. Moreover, porous α-Fe2O3 nanorods also showed excellent adsorptive ability for organic dyes.
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RSC Advances
·
2017
·Vol. 7
·期 84
·53076-53086
·
IF 3.108
Xin Jin,Weiquan Cai,Zhijun Cai
Ordered mesoporous alumina (MA) was successfully modified with three amino organosilanes including 3-aminopropyltriethoxysilane (1N), N-(β-aminoethyl)-γ-aminopropylmethylbimethoxysilane (2N) and N-3-trimethoxysilylpropyldiethylenetriamine (3N) via a facile grafting method, and the as-prepared amino organosilane grafted MA–1N, MA–2N and MA–3N show enhanced adsorption performance towards Cr(VI) removal from wastewater. Their physicochemical properties and the MA before modification were comparatively characterized by FT-IR, TEM, XRD, N2 adsorption–desorption, CHNS elemental analysis, zeta potential measurements and XPS. Their adsorption performance was also comparatively studied along with the effect of contact time, adsorption isotherms, multi-metal ion adsorption, interference of co-existing anions and regeneration ability in batch experiments. It was found that their adsorption kinetics data were better fitted by the pseudo-second order model; adsorption isotherms were better described by the Langmuir isotherm for MA–1N, the Freundlich isotherm for MA–2N and the Temkin isotherm for MA–3N. Among them, MA–2N shows the maximum adsorption capacity of 137.9 mg g−1 which is more than twice the 59.4 mg g−1 of MA. The residual concentration of Cr(VI) with a concentration of 50 mg L−1 when treated with MA–2N meets the emission standard of the World Health Organization (WHO). Moreover, MA–2N shows better selectivity toward Cr(VI), and can reduce relatively more Cr(VI) to low toxicity Cr(III). More results were found that Cr(VI) is adsorbed on the surface through a monodentate ligand or bidentate ligand, and then Cr(VI) is reduced to Cr(III) by an adjacent electron donor, after which Cr(III) is co-precipitated with the adsorbents. All the amine-grafted samples show good reusability for 5 cycles. These results indicated that the amino organosilane grafted ordered MA with high adsorption capacity, good selectivity and favourable reusability is a promising candidate for Cr(VI) removal, in combination with its low cost and energy saving preparation process.
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