WATER AIR AND SOIL POLLUTION
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2024
·Vol. 235
·期 2
·1-12
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IF 3.8
Liu Yuze,Liang Yinxiu,Cui Wenjie,Zhai Hongyan,Ji Min
The contamination of chromium (Cr(VI)) in groundwater threatens public health because of the industrial development being historically less supervised. To remove Cr(VI) from groundwater and other surface waters, a new FeCl 3 -modified magnetic biochar (MBPH550) was prepared from a waste peanut hull. The magnetic potential was to facilitate the separation of absorbent from the water phase. The removal efficiency, adsorption kinetics and isotherm models, and adsorption mechanism of Cr(VI) on MBPH550 were investigated. MBPH550 had a large specific surface of 243.23 m 2 /g and saturation magnetization of 5.65 emu/g. MBPH550 achieved a removal efficiency of Cr(VI) up to 92.2% ± 2.0%. Low pH favored the adsorption of Cr(VI). At pH 6.0, the adsorption of Cr(VI) on MBPH550 fits the Elovich kinetic model and Freundlich isothermal adsorption model, with an equilibrium adsorption capacity of 6.64 mg/g. In addition to the direct functional group coordination and precipitation on the surface of MBPH550, Cr(VI) was also reduced to Cr 3+ , Cr(OH) 3 , Cr 2 O 3 , and FeCr 2 O 4 , which were all deposited on the surface of MBPH550. MBPH550 could be a widely applied efficient adsorbent for removing Cr(VI) from wastewater, groundwater, and leachate of Cr-contaminated soil. Graphical abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Qingguo Yu,Yimin Liu,Qingru Zeng,Yuxiang Yang,Shunyan Ning,Yuezhou Wei,Xinpeng Wang,Deqian Zeng
Photocatalytic technology provides key benefits in utilizing solar energy for H 2 production and pollutant removal, making the pursuit of efficient photocatalysts a vital area of focus. Herein, a novel p-n heterojunction photocatalyst was synthesized by loading ZnSe nanoparticles onto Cu 2−x Se nanoplates, creating an internal electric field that facilitates the efficient separation of charge carriers and significantly enhances photocatalytic activity. The 14 % Cu 2−x Se/ZnSe nanocomposite exhibits excellent photocatalytic performance, achieving an H 2 production rate of 1846 μmol·g −1 ·h −1 , roughly 34 times that of pure ZnSe. Additionally, the Cr(VI) reduction rate constant of nanocomposite was 0.0277 min⁻¹ , which is 20 times and 5 times higher than those of ZnSe and Cu 2−x Se, respectively. The Cu 2−x Se/ZnSe photocatalyst demonstrated exceptional stability and reusability during multiple cycles of H 2 production and Cr(VI) reduction. An in-depth examination of experimental data and density functional theory (DFT) calculations led to proposing a potential mechanism. This work introduces a simple synthesis method for ZnSe-based photocatalysts, offering a novel approach for the effective application of solar energy in environmental and energy fields.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Meng Lan,Xiaoli Dong,Nan Zheng,Jialin Gou,Yu Wang
The development of environmentally friendly and cost-effective photocatalysts is of vital significance for the effective removal of heavy metal contamination in water, but it is still a crucial challenge. Herein, the novel Sb x Bi 2-x S 3 solid solution photocatalysts with a certain amount of sulfur vacancy were prepared by adjusting the molar ratio of Sb to Bi through a simple hydrothermal strategy, and was applied to the effective photocatalytic reduction of hexavalent chromium (Cr(VI)). Sb 1.75 Bi 0.25 S 3 with optimized ratio has superior reduction performance of Cr(VI), and the photocatalytic efficiency of Cr(VI) can achieve 91.9 % within 1 h of visible light illumination. The remarkable catalytic efficiency is due to the more applicable band structure of the solid solution photocatalyst, which is conducive for the photocatalytic reaction. Moreover, the substitution of Bi causes the crystal distortion of Sb 2 S 3 and induce the generation of sulfur defects, which can effectively capture photoelectrons, accelerate the carriers separation, and improve the reduction performance. This study provides a hopeful photocatalyst for wastewater purification and promotes the exploration of solid solution photocatalyst in water environment remediation.
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NEW JOURNAL OF CHEMISTRY
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2025
·
IF 2.5
Runhong Zhu,Yunlong Shi,Yi Zhou,Yi Xia,Qin Qi,Xiaojie Liang,Meijuan Kuang,Zhenya Jia,Mengyue Wang,Changjiang Yu
In this study, a type of FeNi alloy embedded in biochar (BC) was prepared by a simple, efficient, and pollution-free method to form core–shell type BC@FeNi magnetic materials (BC@FeNi-T-X). The reduction behavior of Fe3+ and Ni2+ during preparation was analyzed, showing their transformation from ionic states to oxidized states, forming metal monomers and alloys. Increasing the Ni content in the SA–Fe3+/Ni2+ gel led to the formation of Fe0.64Ni0.36 and (Fe,Ni) alloys. Mechanistic insights were obtained through adsorption kinetics and isotherm data fitting and by analyzing composite changes before and after Cr(VI) adsorption. BC@FeNi-900-3 exhibited superior corrosion performance compared to the Fe biochar composite (BC@Fe-900-3), enhancing Cr(VI) reduction. Mechanistic studies revealed that Cr(VI) removal by BC@FeNi-900-3 primarily involved (i) Cr(VI) reduction to Cr(III) by Fe0.64Ni0.36 and Fe, (ii) Cr(VI) reduction to Cr(III) by Fe2+, (iii) Cr(VI) reduction to Cr(III) by H˙ generated via Fe0.64Ni0.36 corrosion, and (iv) Cr(VI) adsorption by BC@FeNi-900-3.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xuanqi Hao,Xiao Zhang,Chenchen Liu,Ping Yang
Metal element doping often can improve the photoluminescence (PL) of carbon dots (CDs). In this paper, blue and green emitting CDs (BCDs and GCDs) were synthesized by using phenylenediamine as the carbon and nitrogen sources. Cu-doped CDs (Cu-CDs) were fabricated by using copper acetylacetone as a precursor. The PL peak wavelengths of sample Cu-doped blue CDs (Cu-BCDs) and green CDs (Cu-GCDs) were 450 and 543 nm, respectively. The full width at half maximum of PL spectra were 67.31 and 93.13 nm, the PL quantum yields (PLQYs) were 13.6 and 38.7 %, and the average fluorescence lifetimes were 4.34 and 20.97 ns, respectively. The PL intensity of the Cu-CDs samples was enhanced with the photostability, and thermal stability test results showed that the Cu-CDs samples also had excellent stability. The Cu-BCDs and Cu-GCDs were employed in the field of sensing applications due to their excellent selectivity towards Cr (VI) and tetracycline hydrochloride (TC) detection. The detection limits for Cr (VI) and TC using Cu-BCDs were 0.34 and 0.86 μM, while Cu-GCDs showed detection limits of 0.47 and 0.50 μM, respectively, demonstrating the broad application prospect for Cu-CDs in sensing applications.
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JOURNAL OF SOLID STATE CHEMISTRY
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2024
·
IF 3.2
Yuan Zhou,Jin-Long Jiang,Xia-Ping Zhu,Wen Chen
In this study, attapulgite (ATP) was modified by Zr-based metal organic framework (UiO-66-NH 2 ) and poly(hexamethylenediamine-tannic acid) (HTA), an amino material named UiO-66-NH 2 /HTA/ATP (UHA) was prepared to efficiently remove Cr(VI). The morphology and structure of UHA were analyzed through various characterization methods. The conditions and influencing factors of UHA preparation and Cr(VI) adsorption were studied. The material had a maximum adsorption capacity of 270.3 mg/g for Cr(VI) when pH was 2.0, temperature was 298 K, adsorption time was 300 min, and ionic strength was 0.01 mol/L, which was obtained by the Langmuir fitting model. The adsorption process conforms to the pseudo-second-order kinetic and Langmuir isothermal models, indicating that the adsorption process is mainly based on the chemical adsorption of monolayers. X-ray photoelectron spectroscopy analysis shows that UHA mainly removes Cr(VI) by hydrogen bonding , electrostatic attraction, reduction, and complexation. Thermodynamic investigation suggested a disordered, endothermic and spontaneous adsorption process. After UHA treatment, the simulated wastewater containing Cr(VI) met the discharge standard, and the results of cycling experiments showed that UHA has good renewable performance and offers potential prospects for Cr(VI) removal in water.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Danyan Lin,Xiujie Lin,Hao Li,Hongyuan Huang,Huan Yang,Jie Yang,Baowei Hu,Fengfeng Chen,Xinrong Guo,Xiangke Wang,Wen Yao
Herein, the ultrathin porous nitrogen-doped carbon nanosheet (uPNC-NS-800) catalyst was developed for efficient Cr(VI) reduction. Its versatile structures were obtained via thermal exfoliation of metal-organic frameworks with KCl. Impressively, uPNC-NS-800 achieved complete reduction of Cr(VI) to Cr(III) within only 6 min in oxalic acid (OA) aqueous solution, exhibiting significantly higher catalytic efficiency compared to PNC-NS-800, which lacks ultrathin structure. It also retained high catalytic activity after twelve cycles and exhibited excellent applicability, effectively removing Cr(VI) from various water environment within 30 min. Additionally, electron paramagnetic resonance spectroscopy indicated that uPNC-NS-800 promoted the generation of ·CO 2 − and ·OH radicals from OA, accelerating Cr(VI) reduction. Density functional theory calculations suggested that Defect C was the dominated active center and Pyridine N, Pyrrole N, and Graphite N were the synergistic active sites to together facilitate Cr(VI) reduction. This study provides a new insight into designing efficient carbon-based catalysts for real environmental wastewater remediation.
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Processes
·
2024
·Vol. 12
·期 5
·905
·
IF 2.8
Tianji Liu,Huawei Guo,Qing Yu,Yajun Wang,Huan Liu,Yanan Zeng,Yitong Wang,Chunyu Liu,Junguo Li
In this study,Chlorella pyrenoidosawas cultured with different concentrations of Cr(III) and Cr(VI), and the changes in biomass, lipid content, protein content and total sugar content ofChlorella pyrenoidosaunder different culture conditions were detected. The effects of Cr(III) and Cr(VI) on the intracellular antioxidant system and related key enzymes of lipid synthesis were analyzed. The results showed that appropriate Cr(III) and Cr(VI) concentrations could makeChlorella pyrenoidosaregulate the contents of SOD, POD, ASA, CAT and GSH in cells, improve the enzyme activity of ACC and promote lipid synthesis. The aim was to investigate the mechanism of lipid synthesis by analyzing the distribution of Cr(III) and Cr(VI) in algal cells. The lipid content ofChlorella pyrenoidosareached its highest level at 50.43 wt% and 38.00 wt% when both Cr(III) and Cr(VI) concentrations in the culture environment were 0.5 mg/L. These values were 1.37 and 1.03 times higher than the control group, respectively. The addition of appropriate Cr(III) and Cr(VI) concentrations can increase ME enzyme activity and decrease PEPC enzyme activity, shorten the biomass accumulation cycle and prolong the lipid synthesis cycle.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Umer Hayat,Shafuq Abbas,Yingjie Xiao,Rohan Weerasooriya,Xing Chen
Hexavalent chromium (Cr(VI)) is a hazardous and mobile contaminant noted for its severe environmental impacts. This research presents a low-cost, efficient, and eco-friendly method that utilizes starch extracted from Maranta arundinacea (arrowroot) for the selective recovery and discarding of chromium (VI) from electroplating effluents driven by a visible light photochemical procedure. This method alleviates the transition of harmful and toxic Cr(VI) into the less toxic and more stabilized trivalent chromium (Cr(III)), which eventually forms firm coordination complexes with the arrowroot starch along with functional groups such as hydroxyl groups ( OH) and ether groups (C O C), as verified by FTIR and XPS analyses. Noticeable structural alteration in the starch matrix was observed upon interaction with chromium ions. At pH 3.0, the process achieved a maximum removal limit of 98.3 %, but at pH 10.0, the efficiency decreased markedly to 3.2 %. Additionally, within the tested concentration range of 10–50 mg/L, the extraction efficiency remained at or above 90 %. In the presence of competing ions such as Ca, Cu, Zn, and Ni, chromium was selectively removed. Furthermore, when the starch dosage was increased from 50 mg to 450 mg, the efficiency was enhanced by approximately 55 % to nearly 95 %. This increase in dosage promoted the faster reduction within 300 min. The entire approach is environmentally benign, generating no secondary waste, and thus making it a viable and sustainable option for industrial-scale wastewater treatment. These results demonstrate the potential value of arrowroot starch as an efficient material for sustainable and economical chromium remediation.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Zhiguo Wu,Dan Liu,Ying Deng,Runyi Pang,Jinjin Wang,Tian Qin,Zongzheng Yang,Rongliang Qiu
In this research, a new material, chitosan/polypyrrole (CS/PPy), was synthesized and linked with the Cr(VI)-reducing bacterial strain YL3 to treat Cr(VI)-polluted soil. The findings demonstrated that the synergistic application of strain YL3 and CS/PPy achieved the greatest reduction (99.6 %). During the remediation process, CS/PPy served as a mass-storage and sustained release agent in the soil, which initially decreased the toxic effects of high concentrations of Cr(VI) on strain YL3, thereby enhancing the Cr(VI) reduction efficiency of strain YL3. These combined effects significantly mitigated Cr(VI) stress in the soil and restored enzyme activities . Furthermore, wheat growth in the treated soil also significantly improved. High-throughput sequencing of the microorganisms in the treated soil revealed that CS/PPy was not only effective at removing Cr(VI) but also at preserving the original microbial diversity of the soil. This suggests that the combined treatment using strain YL3 and CS/PPy could rehabilitate Cr(VI)-contaminated soil, positioning CS/PPy as a promising composite material for future bioremediation efforts in Cr(VI)-contaminated soils.
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SYNTHETIC METALS
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2016
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IF 2.299
Jianyu Ren,Xiongyi Huang,Ning Wang,Kezhen Lu,Xingxiang Zhang,Wei Li,Dongqin Liu
A composite nanofibers mat containing polyacrylonitrile (PAN) as core and polyaniline (PANI) as sheath had been successfully prepared via solution spinning followed by in situ polymerization, and its hexavalent chromium (Cr(VI)) removal potential was investigated. By altering the processing parameters, bead-free and uniform PAN nanofibers with average diameter of 469 nm could be obtained. The morphological evolution of the PANI/PAN composite fiber mats could be controlled through regulating the molar ratio of oxidant to monomer. The PANI/PAN composite fiber mats presented a superior Cr(VI) adsorption performance. Moreover, the factors affecting the performance of Cr(VI) removal from the aqueous solutions were investigated systematically. The experimental data were fitted to various kinetic models and isothermal adsorption, and the thermodynamic parameters of adsorption process were calculated as well. The PANI/PAN adsorbents were also proven to have good recycling capability, and the mechanism of adsorption and regeneration was investigated in detail.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Peng Liao,Binrui Li,Lin Xie,Xiaoao Bai,Han Qiao,Qianqian Li,Biwei Yang,Chongxuan Liu
Engineered nanoparticles-mediated contaminant transport has been recognized as a significant process governing the mobility of metals and radionuclides in groundwater. Engineered silicate nanoparticles (ESNPs) are attractive materials for the sequestration or extraction of Cr(VI) and other metals and radionuclides from groundwater. While great efforts have been devoted toward the application of these materials for Cr(VI) sequestration, the underlying interface adsorption mechanism is not thoroughly elucidated. This study investigates the immobilization mechanisms of Cr(VI) on a representative ESNPs, NH 2 -MCM-41, over a range of water chemistry conditions. By combining batch adsorption experiments with an array of complementary characterizations, we provided spectroscopic and microscopic evidence that the electrostatic interactions between the positively charged NH 2 -MCM-41 surface derived from amino functionality and the negatively charged Cr(VI) species was the dominant mechanism responsible for Cr(VI) immobilization. In addition, the weak hydrogen bonding interactions may also contribute to adsorption to a degree. Furthermore, thermodynamic studies suggested a favorable, spontaneous, and exothermic adsorption process. Site energy analysis illustrated that the distribution of energy binding sites on NH 2 -MCM-41 is Cr(VI) loading dependent. The new insights provided here can advance understanding of the transport of Cr(VI) associated NH 2 -MCM-41 that benefits the application of ESNPs-based technologies for metals immobilization in groundwater.
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