OPTICAL MATERIALS
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2024
·
IF 3.8
Zhiwei Wang,Qiuying Wang,Yi Wang,Theeranun Siritanon,M.A. Subramanian,Peng Jiang
Mg 2.2- x Co x TiO 4 (0 ≤ x ≤ 0.6) and Mg 2.2- x Cr x TiO 4 (0 ≤ x ≤ 0.6) solid solutions with spinel structure were successfully synthesized by solid-phase reaction. Excess MgO was added to achieve the single phase of the compounds. The transition metal ions Co/Cr tune the colors of Mg 2 TiO 4 to intense blue and green, respectively. The root of the observed intense blue color of Mg 2.2- x Co x TiO 4 is attributed to the 4 A 2 (F) → 4 T 1 (P) transition of Co 2+ in tetrahedral coordination. In Cr doped Mg 2 TiO 4 , Cr exists in a mixed oxidation states of +3 and + 6. The green color of the as-synthesized Mg 2.2- x Cr x TiO 4 is attributed to 4 A 2 (F) → 4 T 1 (F) at 410 nm–500 nm and 4 A 2 (F) → 4 T 2 (F) at 610 nm transitions of Cr 3+ . Besides, the Cr 3+ - Ti 4+ charge-transfer transition at 410 nm–500 nm is also the reason why it shows green. The as-synthesized pigments were dispersed into PMMA to prepare blue/green plastics.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2025
·
IF 1.6
You Yanran,Zhu Hongtao,Dong Hongliang,Sheng Guodong
In this work, FeS was anchored on mesoporous silica microspheres (SiO 2 200, SiO 2 500, and SiO 2 1000), and named as FeS@SiO 2 (i.e., FeS@SiO 2 200, FeS@SiO 2 500, FeS@SiO 2 1000), in adsorbing and detoxifying U(VI)/Cr(VI) from wastewater. Results demonstrated that FeS@SiO 2 exhibited higher efficiency towards U(VI)/Cr(VI), outperforming FeS and SiO 2 alone. Kinetic investigations revealed that adsorption of U(VI)/Cr(VI) followed pseudo–second–order model best, highlighting effective chemical interplay. XPS investigations demonstrated multi–species which was included FeS, Fe(II), S 2− and polysulfide (S 2 2− , S n 2− ) could be employed as reductants for U(VI)/Cr(VI) adsorption. The combination of SiO 2 and FeS offered an enhanced efficiency for U(VI)/Cr(VI), making these composites promising materials in water purification. Graphical
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yabin Wang,Ronghao Wang,Xiuping Ding,Hua He
Hexavalent chromium has seriously destroyed the natural environment and threatened human health. It is crucial but still challengeable to dispose of Cr(VI) handily and recycle the as-generated Cr-based byproducts. Herein, on the one hand, we demonstrate a feasible strategy for cyclic utilization of Cr(VI) species by converting them from toxic to trash and further to treasure. Multiamino-functionalized dendritic mesoporous silica nanoparticles (DMSNs) can adsorb chromium oxyanion ions (HCrO 4 − and Cr 2 O 7 2– ) and in situ reduce Cr(VI) to Cr(III). The as-obtained DMSNs-Cr(III) function as supported catalysts and efficiently catalyze some cross-coupling reactions. On the other hand, pore-size-dependent adsorption of HCrO 4 − and Cr 2 O 7 2− has been realized by regulating DMSNs’ channel size. Furthermore, pore-size-dependent adsorptive and catalytic performances have been demonstrated as well. Our results not only provide a blueprint for cyclic utilization of Cr(VI) in sewage, but also exhibit a versatile DMSNs-based platform that couples with potential structure–activity correlations.
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INTERNATIONAL BIODETERIORATION & BIODEGRADATION
·
2024
·
IF 4.1
Liwen Zhang,Luyao Xi,Shuyu He,Huizi Wen,Shanyi Tan,Shaohua Chen
Bioremediation has garnered considerable interest due to its advantages of economy and no secondary pollution. However, the direct electron transfer rate between microorganisms and Cr(VI) is low. The bioreduction of Cr(VI) by Shewanella oneidensis MR-1 ( S. oneidensis ) in the presence of formylmethylflavin (FMF) was conducted to understand how FMF mediated the extracellular electron transfer process to improve Cr(VI) removal. In this study, FMF was firstly synthesized by modifing RF to increase its solubility and redox activity. The findings indicate that S. oneidensis /FMF exhibited better Cr(VI) removal performance compared to that of S. oneidensis . Under optimum conditions, 40 mg/L Cr(VI) could be completely removed by S. oneidensis /FMF within 120 h, while only 48.6% of Cr(VI) was removed by S. oneidensis , and the first order rate constant (k) for the Cr(VI) elimination by S. oneidensis /FMF (0.033 h −1 ) was about 4.1-fold greater than that of S. oneidensis (0.008 h −1 ). Moreover, the removal of Cr(VI) by S. oneidensis /FMF were dominated by reduction, and supplemented by adsorption and complexation. FMF enhance the extracellular electron transfer rate (EETR) was confirmed by electrochemical cyclic voltammetry (CV) and linear scanning voltammetry (LSV) experiments. This study emphasizes the potential important role of FMF in environmental bioremediation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hui Wang,Xinyi Long,Xuyi Yang,Qiyin Huang,Zewen Chen,Shengji Wu,Jie Zhou
Coal-fired mercury pollution poses an escalating threat to the ecosystem and human health. In this study, we designed and prepared transition metal oxides (MO x ) supported non-carbon-based adsorbents for Hg 0 removal using non-thermal plasma, based on the mechanism of Hg 0 removal. Specifically, MO x supported SiO 2 adsorbents were examined to explore the correlation between their redox ability and Hg 0 removal. The plasma treatment process could enhance the catalytic oxidation activity of the MO x (oxygen activation center) and effectively enhance Hg 0 removal efficiency. The Hg 0 removal efficiencies of Co 3 O 4 /SiO 2 -P and CrO x /SiO 2 -P prepared by plasma could maintain above 95.0 % and 85.0 % in the whole test, whereas the Co 3 O 4 /SiO 2 and CrO x /SiO 2 adsorbents prepared by traditional incipient wetness impregnation method exhibited lower Hg 0 removal efficiencies of nearly 20–30 %. Furthermore, with the addition of SO 2 , the Hg 0 removal performance of Co 3 O 4 /SiO 2 -P decreased significantly, while the performance of CrO x /SiO 2 -P remained relatively unchanged. Characterization results containing X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) showed that the oxygen activation centers on CrO x /SiO 2 -P exhibited excellent resistance to SO 2 and were less susceptible to SO 2 occupation than those on Co 3 O 4 /SiO 2 -P. The plasma-prepared CrO x /SiO 2 -P adsorbents demonstrate promising potential for industrial applications in Hg 0 removal.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 43
·20280-20288
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IF 3.591
Shengli Zhang,Yanbo Pei,Menglin Li,Wei Li,Kai Su,Junmin Chen,Hongwei Yang
In the present study, a functionalized carboxymethyl cellulose-based adsorbent (PEI–PAM–CMC) was prepared via linking polyethyleneimine and polyacrylamide with carboxymethyl cellulose by epichlorohydrin. It possessed a sponge-like structure with a large number of micron-sized pores, which facilitated the mass transfer of Cr(VI). Under neutral conditions, Cr(VI) can be efficiently removed by the protonated PEI–PAM–CMC. The residual levels in the effluent were below 0.5 and 0.05 mg L−1 for 10 and 1 mg L−1 of Cr(VI), respectively. The adsorption data fitted well with the pseudo-second order kinetic model and Langmuir isotherm. Common ions including Cl−, H2PO4−, NO3−, K+, Na+, Ca2+, Mg2+ and Cr3+ had neglectable influence for Cr(VI) adsorption on the PEI–PAM–CMC except SO42−. Meanwhile, PEI–PAM–CMC showed good regeneration and reusability with a 7.5% decrease in the removal rate after ten adsorption/desorption cycles. XPS analysis and DFT calculation revealed that Cr(VI) uptake by the PEI–PAM–CMC was involved in electrostatic attraction and chemical binding. Electrostatics and induction were the main weak interaction between Cr(VI) and the adsorbent, and the major chemical adsorption sites were mainly distributed in the nitrogen groups. This research not only developed an efficient material for Cr(VI) removal but also provided a promising insight into an adsorption mechanism study.
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CARBOHYDRATE POLYMERS
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2020
·
IF 7.182
Jinfeng Mei,Hui Zhang,Siqi Mo,Yuzhe Zhang,Zhongyu Li,Hongxiang Ou
Low-density aerogels with three–dimensional porous structure were synthesized using soluble chitosan oligosaccharide (COS) and graphene oxide (GO) as raw materials under mild conditions. Tetraethylenepentamine was used as the crosslinker of COS and the bridge between GO and COS, as well as the provider of functional groups. Structural characterizations revealed that crosslinked COS polymers firmly fixed on the surfaces of GO sheets and abundant amino groups homogeneously distributed in the pores. The adsorption capacity of the aerogel for Cr(VI) can reach up to 519.8 mg/g, while the adsorption efficiency for trace Cr(VI) adsorption can also reach 100% especially. The adsorption mechanism was investigated with X–ray photoelectron spectroscopy and zeta potential analysis. The superb properties suggested that the strategy of using COS as a raw material for the fabrication of adsorbents with controllable structure and form is meaningful.
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PubMed
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 10
·2580
·
IF 5.076
Jien Ye,Yating Luo,Jiacong Sun,Jiyan Shi
The aggregation of nanoscale zero-valent iron (nZVI) particles and their limited transport ability in environmental media hinder their application in environmental remediation. In this study, the Cr(VI) removal efficiency, transport performance, and toxicity of nZVI and bentonite-modified nZVI (B-nZVI) were investigated. Compared with nZVI, B-nZVI improved the removal efficiency of Cr(VI) by 10%, and also significantly increased the transport in quartz sand and soil. Increasing the flow rate can enhance the transport of nZVI and B-nZVI in the quartz sand columns. The transport of the two materials in different soils was negatively correlated with the clay composition. Besides, modification of nZVI by bentonite could reduce toxicity to luminous bacteria (Photobacterium phosphereumT3) and ryegrass (Lolium perenneL.). Compared with Fe-EDTA, the transfer factors of nZVI and B-nZVI were 65.0% and 66.4% lower, respectively. This indicated that although iron nanoparticles accumulated in the roots of ryegrass, they were difficult to be transported to the shoots. The results of this study indicate that B-nZVI has a strong application potential in in situ environmental remediation.Keywords:nanoscale zerovalent iron (nZVI);hexavalent chromium;bentonite;toxicity
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高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Wei Jiahao,Cai Weiquan
Carbon microspheres have attracted considerable interest in the field of heavy metal wastewater treatment. Herein, waste peanut hull derived N-doped spherical carbons (WPHSC) were successfully prepared by a one-step mild hydrothermal method. The obtained samples were characterized by XRD, SEM, FT-IR and XPS. The adsorption tests indicated that the WPHSC show excellent adsorption performance for Cr(VI) with the maximum adsorption capacity of 181.82 mg g −1 . While treating the real electroplating wastewater with a WPHSC dosage of 4 g L −1 , the Cr concentration significantly decreased from 652.96 mg L −1 to 113.42 mg L −1 . The adsorption mechanism attributes to the electrostatic attraction and redox reaction between Cr(VI) and WPHSC. Importantly, this method can be extended to other waste plant biomass, including sunflower seed hulls, walnut shell, coconut shell and corncob as carbon sources. The adsorption removal efficiencies of the obtained carbon spheres for 100 mg L -1 Cr(VI) are all over 99.5 % with low residual concentrations less than 0.5 mg L −1 . This universal study expands the scope of renewable raw materials for preparing carbon spheres with great application potential in the field of chromium-containing wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaolu Fan,Tianyun Wu,Xue Wu,Bo Jiang,Jing Xiong,Fei Li,Shupeng Li,Lei Zheng,Yunpeng Liu,Dayi Zhang
Chemical stabilization is a frequently used method to stabilize heavy metals in soils, however suffering from the reagent overdosage and exorbitant cost due to the insufficient reactions between chemical stabilizers and heavy metals. In this work, we innovated an economy and energy efficient stabilization technique, namely steam flash heating (SFH), and investigated its stabilization performance and mechanisms for hexavalent chromium [Cr(VI)]. SFH can efficiently promote Cr(VI) reduction by both soil organic matter and chemical stabilizers. From thermophysical analysis, SFH efficiently enhanced the molecular contact and accelerated mass transfer in porous soils, resulting in the promoted transformation of Cr(VI) into OM-Cr(III), Fh-Cr(III), and Cr(OH) 3 from Cr/Fe/S/C XANES results. By replacing partial chemical stabilizers with soil organic matter in Cr(VI) reduction, SFH decreased nearly 70.7% of cost and 38.1% of CO 2 emission. Besides, Mn XANES results unraveled that MnO x was reduced by soil organic matter and chemical stabilizers with the aid of SFH, and this process decreased the risk of Cr(III) re-oxidation and benefited long-term Cr stability. These results proved that SFH could efficiently immobilize Cr with low energy consumption, low economic cost, high stabilizer efficiency, and low re-mobility risk, exhibiting applicable potential in the remediation of Cr-contaminated soils. This study revolutionized chemical stabilization by SFH and unraveled the underlying mechanisms of Cr immobilization in contaminated soils.
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Open Chemistry
·
2020
·Vol. 18
·期 1
·97-107
·
IF 1.216
Huayu Huang,Yang Wang,Yubin Zhang,Zhiying Niu,Xinli Li
Amino-functionalized graphene oxide (GO-NH 2 ) was synthesized by grafting (3-aminopropyl) triethoxysilane on the graphene oxide (GO) surface. The GO-NH 2 with high surface area and numerous active sites can efficiently adsorb Cr(VI), Cu(II), Pb(II) and Cd(II) ions. The maximum adsorption capacities of GO-NH 2 for Cr(VI), Cu(II), Pb(II) and Cd(II) were 280.11, 26.25, 71.89 and 10.04 mg g −1 , respectively. The pseudo-first-order and pseudo-second-order kinetic models were employed to describe the kinetic processes. The experimental data agreed well with the pseudo-second-order kinetic equation, and the adsorption of heavy metals onto GO-NH 2 occurs via chemical adsorption. The characteristics of Cr(VI), Cu(II), Pb(II) and Cd(II) in the GO-NH 2 adsorption processes were analyzed using the Langmuir and Freundlich isotherm models. The adsorption processes of Pb(II) and Cd(II) on GO-NH 2 were fit by the Langmuir model. The Freundlich isotherm model was well correlated to Cr(VI) and Cu(II). The GO-NH 2 is a promising material for the removal of heavy metal ions from industrial wastewater. This study provides an effective pathway to process industrial wastewater, and the GO-NH 2 has a good adsorption effect for the treatment of heavy metals in industrial wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Changwei Bai,Gang Yang,Shirong Zhang,Shihuai Deng,Yanzong Zhang,Chao Chen,Jingsong He,Min Xu,Lulu Long
A novel electrocatalytic anode (ECA)/α-MnO 2 /peroxymonosulfate (PMS) synergistic system was developed and evaluated for the removal of combined tetracycline (TC) and hexavalent chromium (Cr(VI)) pollution from waste waters. The factors affecting the efficiency of the removal of the combined pollutants, such as the synthesis time of the electrode, the amounts of raw materials, the PMS dose, the voltage, the initial pH and the coexisting ions were investigated. The breakdown products of PMS in the ECA/α-MnO 2 /PMS system improved the conductivity of the solution and the electrical current promoted the conversion of the valence state of Mn ions, resulting in a synergistic effect between the ECA and PMS activation processes, which improved the efficiency of removal of TC. The cathode chamber was fully utilized to simultaneously reduce Cr(VI). Synergistic effects occur in the ECA/α-MnO 2 /PMS system in appropriate ranges of the voltage or PMS dose, although the efficiency of the removal of TC depends mainly on the electrical current in the system. Both hydroxyl (•OH) and sulfate (SO 4 •− ) radicals played important parts in the degradation of TC. The main degradation products of TC were identified and degradation pathways proposed. The synergistic effects between the ECA process and a Fenton-like process was studied, providing a new approach for the study of electro-Fenton technology and the removal of combinations of TC and Cr(VI) from waste waters.
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