CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Li Song,Yixing Qiu,Xi Zhang,Fuqiang Liu,Aimin Li
A green strategy involving photocatalysis unit (PU) and adsorption unit (AU) using sodium polyacrylate hydrogel (PAAS) was proposed to achieve high iron utilization in efficient Cr(VI) removal. In PU, the novel process of light-controlled sustained release (LCSR) led to the increased utilization of Fe(II). Meanwhile in AU, the highly selective recovery of Fe(III) was achieved due to the larger complexation rate. Specifically, the LCSR process in PU was implemented by PAAS loaded with Fe(III) (PAAS-Fe), which generated Fe(II) to reduce Cr(VI) via ligand–metal charge transfer (LMCT) reaction. And the utilization of Fe(II) was up to 95.30%, meanwhile 45.85% of generated Fe(III) participated in the coordination with PAAS to maintain LMCT reaction. The treatment capacity via LCSR process in fluidizer reached about 14,400 and 13000 mL/g for simulated and real effluent, respectively. In AU, the selective separation factor of Fe(III) was 42.75 and iron recovery ratio was 98.01%. Furthermore, PAAS in AU loaded with Fe(III) could be reused as photocatalyst by switching the light. The chemicals cost of the strategy was reduced by 93.90%-98.25% compared with other reductants. In general, PU-AU strategy is efficient and eco-friendly for Cr(VI) removal, which seeks a sustainable way with lower chemical consumption.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Xin Gao,Baodong Li,Shouwei Jian
The fabrication of visible-light-driven heterostructured photocatalysts has been regarded as a promising strategy to enhance the photocatalytic performance. Here, a wet chemical method was adopted to prepare step-scheme CeO 2 /CaIn 2 S 4 (CCIS) composites. The CeO 2 nanoparticles were deposited on the surface of CaIn 2 S 4 (CIS) to form a tight interface, namely, heterojunction , which was confirmed by the multiple characterization methods. The formed heterojunction between CeO 2 and CIS was advantageous to promoting the charge carrier separation and migration. The photocatalytic performance of the resulted CCIS composites were evaluated by the Cr(Ⅵ) reduction under visible light irradiation. The optimized CCIS-10 sample exhibited the highest photocatalytic Cr(Ⅵ) reduction activity with the efficiency of 95% within 105 min. The enhanced photocatalytic activity of CCIS was attributed to the construction of step-scheme heterojunction system, leading to the efficient charge separation and high redox potential . The proposed mechanism for the enhanced photocatalytic performance was fully discussed and confirmed. This work may provide a simple strategy to rationally design efficient photocatalyst for Cr(Ⅵ) removal.
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Journal of Materials Research and Technology-JMR&T
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2022
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IF 6.267
Lihua Li,Shuang Liu,Meng Zhou,Yi Zhang,Shengli Liang,Jinliang Huang,Baohong Tian,Yongfeng Geng,Yijie Ban,Yong Liu,Yanlin Jia,Xu Li,Alex A. Volinsky
The effect of graphene on the thermal deformation of Cu/CeO 2 /Cr and GO-Cu/CeO 2 /Cr composites was studied. The isothermal compression test was carried out with Gleeble-1500D thermomechanical simulation device in the range of 600–900 °C and strain rate of 0.001–1 s −1 . The microstructure after deformation was characterized and analyzed by optical microscope, scanning electron microscope (SEM), transmission electron microscope (TEM) and electron backscatter diffraction (EBSD). The interaction of work hardening, dynamic recovery and dynamic recrystallization was described. The constitutive equation was successfully established. The results show that Cr particles are extruded into strips, and nano CeO 2 particles nail dislocations, which inhibit dynamic recovery and dynamic recrystallization. Dispersion strengthening, twin strengthening and grain refinement strengthening occur the thermal deformation of GO-Cu/CeO 2 /Cr composites, increase the flow stress and activation energy of the composites, and inhibit the dynamic recrystallization of the composites. When the hot deformation temperature increases, the texture orientation is strengthened. GO-Cu/CeO 2 /Cr composites have typical dynamic recovery characteristics and high temperature properties.
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高影响因子
FUEL
·
2023
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IF 7.4
Jinwei Wang,Yiquan Xiang,Weiyi Zhang,Yijie Zhang,Qiang Zhao,Jinping Li,Guang Liu
Developing a non-noble metal-based oxygen evolution electrocatalyst that works under high current densities is a challenging task in hydrogen production by water splitting. Herein, an efficient OER electrocatalyst was formed by combining Cr-doped FeOOH with high OER activity and FeSe 2 with high conductivity. Through the addition of FeSe 2 and the incorporation of Cr ion, the conductivity and intrinsic activity of the obtained Cr-FeOOH/FeSe 2 /NF towards OER are dramatically enhanced. To specific, the required overpotential is only 242 mV to realize the current density of 100 mA/cm 2 . In addition, the Cr-FeOOH/FeSe 2 /NF can output large current densities at industrial level, which only needs the overpotential of 293 and 336 mV to deliver the current density of 500 and 1000 mA/cm 2 , respectively. In addition, the overpotential is as low as 291 mV to attain 1000 mA/cm 2 in 30 wt% KOH solution. More importantly, the obtained Cr-FeOOH/FeSe 2 /NF electrode can stable work for 80 h at such a high current density of industrial level, and the overpotential does not increase significantly. This result suggests that the obtained electrocatalyst has latent capacity for industrial application. This work points out the direction for building high-performance oxygen evolution electrocatalysts at large current densities.
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JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION
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2026
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IF 2.4
Wenlong Hui,Yanan Zhao,Meiqi Ren,Qiang Wei,Zhiqiang Dai,Lin Zhu,Lili Zhang,Xiaosheng Zhao
This study used excess sludge from urban wastewater treatment plants as a raw material to prepare sludge-based activated carbon (SAC) via ZnCl2 activation and high-temperature carbonization. The structure of SAC was characterized using XRD, SEM, and FTIR, and the adsorption performance of SAC toward Cr(VI) in wastewater was systematically investigated. The results showed that, under the conditions of a ZnCl2 activator concentration of 1 mol/L, a carbonization temperature of 550°C, and a heating rate of 10 ℃/min, the prepared SAC had a maximum adsorption capacity of 57.90 mg/g for Cr(VI) in wastewater, and could achieve 100% removal of Cr(VI) at an initial concentration of 10 mg/L. The adsorption process conformed to the pseudo-second-order kinetic model and the Langmuir isotherm model, indicating that chemical adsorption was the rate-controlling step, and Cr(VI) was mainly adsorbed in a uniform monolayer on the SAC surface. This study provides a feasible technical route for sludge resource utilization and Cr(VI) wastewater treatment.Implications:In this study, activated carbon was prepared using sludge as the raw material, realizing the reduction and resource utilization of sludge. This method not only solves the problems of land occupation and secondary pollution caused by sludge storage and landfilling, but also reduces the preparation cost of activated carbon, which conforms to the environmental protection policies for solid waste recycling.To address the pollution of highly toxic Cr(VI) in wastewater, the as-prepared sludge-based activated carbon shows excellent adsorption performance, which can efficiently remove Cr(VI) from aqueous solution and significantly reduce the biological toxicity and environmental risks of heavy metals.This work constructs a cyclic utilization pathway of “sludge disposal–functional carbon preparation–heavy metal wastewater treatment,” providing an economically feasible technical scheme for the treatment of chromium-containing industrial wastewater. It has important theoretical value and practical application significance for promoting solid waste resource utilization, improving the water ecological environment and ensuring water environmental safety.
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Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Yimin Huang,Xueyan Li,Yan Peng,Hua Zhang,Anxian Shi,Xiujun Deng,Baoling Wang,Yingtang Zhou,Bing Wang,Guangzhi Hu
The discharge of hexavalent chromium [Cr(VI)] in industrial wastewater into the natural environment can seriously cause harm to the environment and human health. We modified chitosan (CS) with Co and polydopamine (PDA) to synthesize a spherical adsorbent (CS–Co/PDA HCl ) for Cr(VI) removal from wastewater. Co doping can help CS–Co/PDA HCl maintain a high adsorption capacity (666.7 mg g -1 ) for Cr (VI) while retaining a complete bead shape after multiple recycling. In addition, CS–Co/PDA HCl can maintain 96% of its initial adsorption capacity after five adsorption cycles, demonstrating a strong regeneration ability. Under competitive conditions, the adsorption capacity of CS–Co/PDA HCl for Cr(VI) greatly exceed its adsorption capacity for Ni (II) and Mn (II). Because of the high selectivity of CS–Co/PDA HCl for Cr(VI), 1 kg of CS–Co/PDA HCl (cost approximately $31) could reduce the concentration of Cr(VI) in 87 m 3 of secondary electroplating wastewater containing various complex components to the drinking water standard. Owing to the high selective adsorption capacity of CS–Co/PDA HCl for Cr(VI) and its good regeneration ability and expected economic feasibility, CS–Co/PDA HCl can find potential applications in removing Cr(VI) from real wastewater .
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CHEMICAL ENGINEERING SCIENCE
·
2023
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IF 4.7
Ye Zhaochun,Yao JiaCheng,Zheng Wen,Yuan Wenhui,Guan Jianyu,Li Li,Xiao Hong
Octafluoropropane (C 3 F 8 ) is a kind of super greenhouse gas, and the low concentration of octafluoropropane makes it difficult to be adsorbed and removed. In this study, a series of Co-doped MOFs (Co x Cr-MIL-101) have been successfully synthesized using a hydrothermal method without the addition of strong acids such as HF. The structural properties of the prepared Co x Cr-MIL-101 are characterized using SEM, XRD, nitrogen adsorption desorption test, etc. The adsorption properties of C 3 F 8 are measured by single-component isothermal adsorption experiments and fixed bed adsorption breakthrough experiments. The adsorption mechanism was investigated via the adsorption theory models. The results show that the introduction of cobalt ions can effectively improve the adsorption capacity of MIL-101, among which the Co 0.2 Cr-MIL-101 exhibits the best adsorption performance. The C 3 F 8 equilibrium adsorption capacity reaches 0.077 mmol/g at 298 K and 180 Pa, which is 3.03 times that of the pristine MIL-101 and the dynamic adsorption capacity is 20.710 mmol/g (298 K, 1.2 L/min), which is 9.37 times that of the pristine MIL-101. Inspiringly, the IAST separation selectivity of C 3 F 8 /N 2 at 100 kPa is up to 146.7, which is 14.3 times that of the pristine MIL-101. More importantly, the co-modified adsorbent showed better thermal stability and cyclic stability. In addition, Co 0.2 Cr-MIL-101 fits the Freundlich isothermal adsorption model, and the adsorption mechanism analysis shows that the high adsorption capacity of Co 0.2 Cr-MIL-101 benefits from the unique pore structure and abundant active sites of the modified MOFs.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Yingying Guo,Chenhui Wang,Yuhang Xiao,Xiaohong Tan,Weidong He,Jianpo Chen,Yan Li,Hao Cui,Chengxin Wang
Fe single-atom catalysts (SACs) have emerged as a promising alternative to platinum for catalyzing oxygen reduction reactions (ORR). Nevertheless, their practical applicability is hindered by insufficient stability caused by structural corrosion during ORR. Here, we developed an effective strategy to optimize and stabilize the Fe SAs (single-atoms) sites by implanting chromium (Cr) atomic clusters (ACs) to address the formidable deactivation issue of the best-performing yet unstable Fe-N-C catalysts. Cr AC -Fe 1 /N-S-C demonstrates an amazing stability with a negligible decline in activity after 100,000 CV cycles, and can maintain 81% of initial current after a continuous 50-hour operation period. Theoretical calculations and experimental evidence substantiate that the integration of Cr ACs not only weakens the binding of OH* to the Fe site, thereby facilitating the ORR process, but also eliminates in situ-generated reactive oxygen species (ROS) and retards Fe ion leaching from active sites, thus stabilizing of the Fe SA sites.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Jun Shang,Yanni Guo,Deliang He,Wei Qu,Yining Tang,Lei Zhou,Rilong Zhu
A novel graphene oxide-dicationic ionic liquid composite (GO-DIL) was prepared by modifying graphene oxide (GO) with a dicationic ionic liquid (DIL), 3,3′-(butane-1,4-diyl) bis (1-methyl-1H-imidazol-3-ium) chloride ([C 4 (MIM) 2 ]Cl 2 ). GO and GO-DIL were characterized by SEM, BET, FTIR, and XPS, and the materials were used for Cr(VI) adsorption. Batch adsorption studies showed that adsorption reached equilibrium within 40 min, and the optimal pH was 3, where the electrostatic attraction between GO-DIL and Cr(VI) was maximized. The maximum theoretical Cr(VI) adsorption capacity ( q m ) was 271.08 mg g −1 , and q m remained above 228.00 mg g −1 after five cycles. The adsorption data were fitted well by both the pseudo-first-order kinetic model and the Langmuir model. Furthermore, thermodynamics calculations revealed that adsorption was a spontaneous endothermic process. Importantly, electrostatic attraction between Cr(VI) and the protonated imidazole N + of GO-DIL played a critical role in Cr(VI) adsorption, and Cr(VI) was reduced to Cr(III). Thus, GO-DIL is predicted to be an effective adsorbent for Cr(VI) and other heavy metal ions in wastewater.
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PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 8
·4713-4722
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IF 3.361
Zhenyu Yan,Ting Wu,Guigan Fang,Miao Ran,Kuizhong Shen,Guangfu Liao
Recently, research interest in the application of lignin is growing, especially as adsorbent material. However, single lignin shows unsatisfactory adsorption performance, and thus, construction of lignin-based nanocomposites is worth considering. Herein, we introduced graphene oxide (GO) into lignin to form lignin/GO (LGNs) composite nanospheres by a self-assembly method. FTIR and 1H NMR spectroscopy illustrated that lignin and GO are tightly connected by hydrogen bonds. The LGNs as an environmental friendly material, also exhibit excellent performance for Cr(VI) removal. The maximum sorption capacity of LGNs is 368.78 mg g−1, and the sorption efficiency is 1.5 times than that of lignin nanospheres (LNs). The removal process of Cr(VI) via LGNs mainly relies on electrostatic interaction, and it also involves the reduction of Cr(VI) to Cr(III). Moreover, LGNs still have high adsorption performance after repeating five times with the sorption capacity of 150.4 mg g−1 in 200 mg g−1 Cr(VI) solution. Therefore, the prepared lignin–GO composite nanospheres have enormous potential as a low-cost, high-absorbent and recyclable adsorbent, and can be used in wastewater treatment.
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PubMed
高影响因子
Surfaces and Interfaces
·
2021
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IF 4.837
Zhongxuan Xu,Diandi Li,Yuping Tan,Qinyu Yang,Han Xiong,Jiguang Li,Hong Deng,Zhang Lin
Microbial treatment of heavy metals is a low-cost and environmentally friendly method. During the treatment of chromium pollution, environmental media has a great impact on the efficiency of bacteria Cr immobilization. However, when Cr(VI) coexist with different metal cations , the reduction of Cr(VI) and the immobilization of Cr by bacteria are still unclear. In our research, although bacteria were significantly promoted the reduction of Cr(VI) with the coexistence of Mn(II), the bacteria produced the maximum of soluble organic Cr(III). In the performance of immobilization Cr, Mg(II) group has the highest chromium immobilizing rate. In addition, Cd(II) has the strongest inhibitory effect on Cr(VI) reduction and Cr immobilization. The SEM results show that Cr were stored in the cells. However, XRD analysis did not demonstrate the crystal structure. Our research investigated the ability of bacteria to reduce and immobilize Cr with the coexistence of 9 different metal ions, and provided a reference for a deeper understanding of the relationship between bacteria and metal ions.
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METALS AND MATERIALS INTERNATIONAL
·
2021
·Vol. 27
·期 12
·5389-5398
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IF 3.642
Hong S. F.,Lu Z. C.,Liu Y. H.,He Q. M.,Jiang W.,Zeng M. Q.
Abstract Supersaturated solid–solutions in a W–Cr alloy system were fabricated by conventional milling and plasma milling. The different extension mechanisms of the solid solubility that were created by ball milling with and without discharge plasma were studied. The solid–solubility of Cr in W for the P-milling W–Cr alloy system was higher, which indicates that plasma milling promotes the formation of W(Cr) solid–solution more easily than conventional milling. According to Miedema’s model, in the W–Cr alloy system, the free-energy change to form a W(Cr) solid solution by plasma milling is reduced compared with conventional milling because of the heating effect of the discharge plasma. Therefore, a higher stored energy in the grain boundaries and dislocations of the W–Cr nanograins during plasma milling makes it easier to overcome the thermodynamic barrier in the formation of a solid–solution, when compared with conventional milling. Graphic Abstract
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