JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2017
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IF 3.454
Pande Zhang,Baoyan Chai,Benxue Jiang,Yiguang Jiang,Shuilin Chen,Qijun Gan,Jintai Fan,Xiaojian Mao,Long Zhang
Cr (0.2 at.%) and Nd (0.8 at.%) co-doped Lu 3 Al 5 O 12 ceramics were fabricated with MgO as the sintering additive. The addition of a small amount of MgO can affect the grain boundary mobility and influence the number and location of micropores in ceramics during the sintering process. The results show that when the MgO content is 0.02 wt.%, high-transparency Cr,Nd:LuAG ceramics can be obtained by vacuum sintering at 1670 °C for 5 h followed by hot isostatic pressing (HIP) post-sintering at 1750 °C in an argon atmosphere ( P = 200 MPa) for 5 h. The optimum in-line transmittance of the HIPed Cr,Nd:LuAG ceramics (3 mm thick) is 83.5% at a wavelength of 840 nm and 84.0% at 710 nm.
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MATERIALS LETTERS
·
2019
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IF 3.019
Xin Li,Jin Zhang,Wanling Shen,Shutao Xu
MIL-53(Cr) is a well-known and important metal-organic framework material. However, the long synthesis time of MIL-53(Cr) restricts its applications. Herein, we report a facile method to kinetically modulate the crystallization route and decrease the synthesis time of 72 to only 8 h by simply increasing the usage of HF.
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JOURNAL OF ENVIRONMENTAL ENGINEERING
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2019
·Vol. 145
·期 6
·04019028
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IF 1.657
Xue Zhang,Qin Lei,Xingzhang Wang,Jianhao Liang,Chong Chen,Hong Luo,Hongmei Mou,Qiulin Deng,Tinghong Zhang,Jinlong Jiang
A novel modified attapulgite has been developed. The method is based on the modification of attapulgite with humic acid, and its application is for the removal of Cr(III) in different conditions. It is characterized using Fourier-transformed infrared spectroscopy (FT-IR), X-ray diffractometer (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET). Then, the adsorption behaviors of as-prepared product are evaluated by static adsorption of Cr(III) from wastewater. The effect of pH, contact time, temperature, concentration, and adsorbent dosage on adsorption of Cr(III) is discussed. The results indicate that adsorption amount of Cr(III) on modified attapulgite is better than that of natural attapulgite. The temperature of the Cr(III) solution is found to have a significant influence on the adsorption amount. The Langmuir isotherm is used to describe well the equilibrium adsorption data, and the enthalpy change is evaluated by the Van’t Hoff equation. The thermodynamic analysis indicates that the adsorption is an exothermic and spontaneous process. Finally, the adsorption kinetic conformed to the quasi-first-order and quasi-second-order ratio equations.
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ENVIRONMENTAL RESEARCH
·
2026
·
IF 8.2
Haidong Li,Yuankun Yang,Han Song,Yi Yang,Hui Gong,Xinwen Chen,Weiguo Tu,Xuemei Luo,Yu Liu,Shu Chen
Potassium butyl xanthate (PBX) is a widely used flotation collector that can persist in tailings waters and may generate toxic by-products. In sunlit tailings ponds, sulfite (S(IV)), Cr(VI), and PBX may coexist under certain conditions, yet the impact of coupled S(IV)-Cr(VI) photochemistry on PBX attenuation remains unresolved. We quantified PBX degradation in a sunlight/S(IV)/Cr(VI) system across pH 3-10, covering tailings-water variability and pH-driven speciation. The process enabled simultaneous PBX removal and Cr(VI) detoxification, with optimum performance at mildly acidic-neutral pH. At pH 6, k obs increased from 3.9×10 -3 min -1 (sunlight) to 2.35×10 -2 min -1 (sunlight/S(IV)) and 3.38×10 -2 min -1 (sunlight/S(IV)/Cr(VI)), confirming synergy. Quenching/probe tests and time-resolved EPR implicated SO 4 •− , •OH, and Cr(V), indicating pH-dependent coupling between the sulfite radical chain and the Cr(VI)/Cr(V)/Cr(III) cycle. DFT and LC-MS showed acidic hydrolysis/self-decomposition of PBX to CS 2 at pH 3, whereas near-neutral conditions favored radical/Cr(V)-mediated oxidation with efficient Cr(VI) reduction. Outdoor natural-sunlight tests using laboratory-generated flotation wastewater prepared from raw ore collected from the mine (with spiked S(IV) and Cr(VI)) achieved 90% PBX removal within 60 min at pH = 6, T ≈ 35-36 °C and solar irradiance ≈ 750-850 W m -2 ,indicating preliminary feasibility of the coupled process in a scenario-based flotation-wastewater matrix.
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SCIENCE OF THE TOTAL ENVIRONMENT
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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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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Peng Li,Yifei Li,Mengyao Qi,Xia Zhang
In recent years, most of the researches on nanozymes have focused on improving their catalytic activity and direct synthesis, but this task is still very complicated. Bimetallic oxides are particularly popular because of their mixed valence and special structure. In this study, iron-manganese bimetallic oxide nano-cubes (IMBO NCs) were prepared by a rapid and effective solvothermal synthesis technique, and showed excellent oxidase-like activity. The exposure of Cr(III) and Cr(VI) inhibited and enhanced the catalytic activity of IMBO NCs respectively. On this basis, a simple, economical and accurate colorimetric sensor was established by combining with 3,3′,5,5′-tetramethylbenzidine (TMB). Using oxidase activity instead of traditional peroxidase activity to detect Cr(III) and Cr(VI) greatly shortens the detection time. The method has also been successfully applied to the quantitative monitoring of Cr(III) and Cr(VI) in lake water. This study provides theoretical support for the effective design of bimetallic oxide nanozyme activity and can guide the development of accurate detection systems for the analysis of Cr(III) in food and Cr(VI) in environment.
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ENVIRONMENTAL TECHNOLOGY
·
2024
·
IF 2.2
Hao Zhang,Jiahong Wang,Peiling Han,Zhi Hu
Industrial wastewater often contains potentially toxic metals and it’s chelates, posing serious threats to human health and aquatic ecosystems, and adsorption is frequently used for the minimization of potentially toxic metals from water. In this study, citric acid modified MOF-808 (MOF-808-CA) was prepared by using citric acid to modify MOF-808 for the removal of Cr(III) and Cr(III)-EDTA from wastewater. MOF-808-CA with the BET surface area of 653.59 m2 g−1 and the pore volumes of 0.467 cm3 g−1 was successfully synthesized. The adsorption of Cr(III) and Cr(III)-EDTA by MOF-808-CA was 40.46 and 17.03 mg g−1 at pH 4.0 and 25°C, respectively. The adsorption isotherms and adsorption kinetics of Cr(III) and Cr(III)-EDTA were summarized using Langmuir-Freundlich isothermal adsorption model and the pseudo-second-order model. Even in high salinity wastewater (35,000 mg L−1), MOF-808-CA displayed a strong affinity for Cr(III) and Cr(III)-EDTA. The site energy (E*) values reduced with the increasing of adsorption capacities, and Cr(III) and Cr(III)-EDTA firstly dominated the high-energy adsorption sites before low-energy adsorption sites. The average site energies for the adsorption of Cr(III) and Cr(III)-EDTA by MOF-808-CA were 26.7 and 24 kJ mol−1, respectively, and the differences in the average site energies further illustrated the essential differences in their adsorption mechanisms. The adsorption by electrostatic adsorption and surface complexation were the main adsorption mechanisms for Cr(III) on MOF-808-CA, whereas hydrogen bonding and complexation were the main adsorption mechanisms for Cr(III)-EDTA on MOF-808-CA. The results showed that the MOF-808-CA adsorbent has a great potential for the removal of both Cr(III) and Cr(III)-EDTA from aqueous solutions.
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ANALYTICA CHIMICA ACTA
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2012
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IF 4.555
Liang Zhao,Yin Jin,Zhangwei Yan,Yuanyuan Liu,Hongjun Zhu
A simple, rapid, sensitive and field-portable colorimetric technique for the determination of Cr(III) in aqueous solution based on an aggregation-induced color transition of gold nanoparticles (AuNPs) has been developed. AuNPs were first functionalized with a dithiocarbamate-modified N -benzyl-4-(pyridin-4-ylmethyl)aniline ligand (BP-DTC). Chelation of Cr(III) by several of these ligands, bound to different nanoparticles, led to nanoparticle aggregation in solution. This gave rise to a color change from wine-red to blue that was discernible by the naked eye and an easily measurable alteration in the extinction spectrum of the particles. The method could be used to determine Cr(III) with a detection limit of 31 ppb. Furthermore, selective detection of trace Cr(III) in aqueous solution in the presence of 12 other transition metal ions has been achieved. Toward the goal of practical applications, the sensor has been further evaluated with a view to monitoring Cr(III) in nutritional supplements and the blood of diabetes patients and also applied in the indirect determination of Cr(VI) in waste water.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Qian Guo,Dongmei Yu,Jing Yang,Ting Zhao,Dan Yu,Lei Li,Duanjie Wang
The distribution characteristics of Cr(VI) species in contaminated soil is crucial for soil remediation; however, there is currently a lack of methods for analysing anionic Cr(VI) species in soil. This study has developed a novel sequential extraction method for speciation of Cr(VI) and Cr(III). Besides extraction experiments, simulated chromium species were prepared to verify the presence of proposed chromium species. The results show that Cr(VI) species in soil can be categorized into water-soluble Cr(VI), electrostatically adsorbed Cr(VI), Cr(VI) specifically adsorbed by minerals containing exchangeable Ca 2+ , Cr(VI) specifically adsorbed by hydrous metal oxides, calcium chromate Cr(VI) and stable complexed adsorption Cr(VI). These Cr(VI) species can be selectively extracted by specific solutions through ion exchange or weak acid dissolution. The most stable Cr(VI) species is Cr(VI) complexed by hydrous iron oxides through bidentate ligand binding; only by dissolution of hydrous iron oxides can this Cr(VI) species be leached. The distribution of Cr(VI) species is closely linked to particular soil compositions including exchangeable Ca 2+ and hydrous iron oxides which determinate the Cr(VI) adsorption in soil. Cr(III) species comprise Fe-Cr coprecipitate hydroxides Cr(III), Fe-Mn oxide-bound Cr(III), organic matter-bound Cr(III) and residual Cr(III). Their distribution depends on the types of reductants present in the soil.
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JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Xinlei Zhang,Shiying Yang
The removal of hazardous Cr(III) complexes via advanced oxidation processes can generate highly toxic Cr(VI), posing significant environmental risks. Therefore, there is an urgent need to develop alternative methods that completely suppress the generation of Cr(VI). In this study, with no detectable Cr(VI) in the solution (below the detection limit of 0.004 mg/L), the carbon nanotubes-modified micron-sized zero-valent aluminum (CNTs@mAl 0 ) can effectively remove 99.50% of Cr(III)-EDTA and 83.34% of TOC under the typical acidic conditions of industrial chromium wastewater (pH = 3.00) by activating molecular oxygen. Then the following alkaline precipitation can easily remove the decomplexed free chromium, lowering total chromium concentration to 0.11 mg/L, which meets most national and regional standards, whereas direct alkali precipitation fails to meet them. Serving as a strong electron reservoir (E 0 = - 1.662 V), micron-sized zero-valent aluminum (mAl 0 ) synergizes with highly conductive carbon nanotubes (CNTs) to effectively activate O 2 , facilitating the production of reactive oxygen species (primarily 1 O 2 and •OH) that drive the oxidative decomplexation of Cr(III)-EDTA. Furthermore, the organic ligands are efficiently mineralized, thus preventing Cr(III)’s re-complexation. More interestingly, once the Cr(VI) is possibly generated, it would be rapidly absorbed by CNTs and be immediately reduced by mAl 0 with strong reducing power, thereby completely suppressing the generation of any Cr(VI) in bulk solution. In conclusion, this study presents an environmentally friendly and straightforward treatment system for Cr(III)-complexes, offering an effective solution to mitigate the environmental risks posed by chromium, particularly Cr(VI), in wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Linheng Chen,Weixi Liu,Yang Wu,Jumei Li,Yibing Ma
There is uncertainty in quantifying the toxic effects of total chromium (Cr) in the environment by modeling the toxicity of individual Cr(III) or Cr(VI). In the present study, the effects of Cr(III) and Cr(VI) on barley root elongation were investigated in a hydroponic system where Cr(III) and Cr(VI) combination dose-response experiments under monotoxicity concentration, single-dose addition, and fixed concentration ratios were designed to identify and quantify their combined phytotoxicity of one element with various valences. The results show that the calculated mixed toxicity unit values for 50% inhibition (TU mix50 ) ranged from 1.06 to 1.45, indicating the weak antagonism effects of Cr(III) and Cr(VI) on barley root toxicity. Also, the single-dose group experiment has proved that the EC 50 of Cr(VI) was increased from 71.2 μM to 119.9 μM with Cr(III) addition, which suggested that Cr(III) has antagonism on the toxicity of Cr(VI). While EC 50 of Cr(III) was not affected by Cr(VI) addition. After introducing the expansion coefficient of Cr(III) on Cr(VI) toxicity, both the extended concentration addition model (e-CA) based on the log-logistic and Weibull equations and the extended independent action model (e-IA) could more accurately predict the barley root elongation under Cr(III) and Cr(VI) interaction. The e-CA model based on the Weibull equation had almost the best correlation coefficient (R 2 ) and lowest root mean square error (RMSE) between the measured and predicted values. Finally, the combined toxicity and antagonism of the same element with co-existing different valences simultaneously were successfully and firstly identified and quantified in the present study.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Cheng Ye,Xinyu Zheng,Lingmiao Fang,Zhanpeng Fu,Di Li,Jianjun Zhu,Deli Jiang
Designing cost-effective and efficient bifunctional electrocatalysts for overall water splitting is crucial for the production of renewable energy, yet still remains challenging. Herein, we report a bifunctional electrocatalyst assembled from CoMoP nanosheets and Cr(OH)3 nanoblocks via hydrothermal and electrodeposition methods. The strong coupling interface formed between CoMoP and Cr(OH)3 not only induces the formation of d–d orbital hybridization, exposing abundant active sites and improving charge transfer efficiency, but also accelerates the reaction kinetics, forming a stable heterostructure, thereby improving the catalytic activity and stability. Meanwhile, the prepared CoMoP/Cr(OH)3/NF electrode demonstrates overpotentials of 88 mV for the hydrogen evolution reaction (HER) and 207 mV for the oxygen evolution reaction (OER) at 10 mA cm–2. Remarkably, assembled CoMoP/Cr(OH)3||CoMoP/Cr(OH)3 requires only 1.52 V at 10 mA cm–2, outperforming most reported advanced bifunctional catalysts. This study proposes a rapid and rational strategy for constructing novel bimetallic phosphide/hydroxide heterostructured electrocatalysts.
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