Article
Chemistry, Physical
Chang Zhu, Xiaoxiao Huang, Tingting Li, Qian Wang, Gang Yang
Summary: Research shows that catalytic reduction by alcohols over clay minerals efficiently controls Cr(VI) contamination; high selectivity towards different Cr products can be achieved by considering different active sites and coverage.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Environmental Sciences
Jia Chen, Xiaoguang Li, Longzhan Gan, Guangyang Jiang, Ruoshi Zhang, Zhe Xu, Yongqiang Tian
Summary: The isolated strain Lysinibacillus HST-98 shows promising results in reducing Cr(VI) pollution, even at high concentrations. Optimal growth conditions for the strain include a pH of 8-9, a temperature of 36 degrees Celsius, and sodium lactate as an electron donor. Coexisting metal ions like Cu2+, Co2+, and Mn2+ enhance Cr(VI) reduction, while Zn2+, Ni2+, and Cd2+ have the opposite effect. The reduction mechanism of strain HST-98 is primarily mediated by intracellular enzymes, and the genes and enzymes related to chromium metabolism in this strain have been annotated to further understand its mechanism.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Bing Shan, Ruixia Hao, Junman Zhang, Jiani Li, Yubo Ye, Hui Xu, Anhuai Lu
Summary: The present study focuses on the isolation of a highly efficient Cr(VI)-reducing bacterial strain (CR-2) from an abandoned chromate plant in Qinghai Province, China. The strain was identified as Lysinibacillus cavernae using 16S rRNA gene sequencing. CR-2 could survive at high concentrations of Cr(VI) and effectively reduce it at optimal pH, temperature, and salinity conditions. The study further investigated the factors affecting the Cr(VI) reduction by CR-2 and the mechanism behind the reduction process.
GEOMICROBIOLOGY JOURNAL
(2023)
Article
Electrochemistry
Jeong Hoon Lee, Eun-Tae Yun, Han-Shin Kim, So-Young Ham, Peng-Fei Sun, Yong-Sun Jang, Jeong-Hoon Park, Namsoo Peter Kim, Hee-Deung Park
Summary: In this study, a novel bioelectrochemical reactor was developed using a vertically aligned carbon nanotube composite as an electroconductive barrier to separate microbial cells from hexavalent chromium (Cr(VI)). Through the secretion of an electron shuttle by Pseudomonas aeruginosa, sustainable biological treatment of chromium compounds was achieved without growth inhibition, even at high Cr(VI) concentrations. The reactor exhibited a Cr(VI) removal rate of 99.6% at 100 mg/L, the highest reduction rate achieved using P. aeruginosa.
ELECTROCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Claresta Joe-Wong, Karrie L. Weaver, Shaun T. Brown, Kate Maher
Summary: Chromium stable isotope ratios can be used to trace the reduction of Cr(VI) to Cr(III) in both ancient and modern systems. The study found that the fractionation factors during Cr(VI) reduction by Fe(II/III)-bearing clay minerals can be predicted from the standard reduction potential or Fe(II)/Fe(total) of the clay, potentially improving the ability to model Cr isotope signatures in geochemical systems. This linear free energy relationship may provide a model for determining other redox-driven kinetic isotope effects in environmentally important isotope systems.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Environmental Sciences
Xinru Yang, Xueming Qin, Jiayin Xie, Xiaoyu Li, Huichao Xu, Yongsheng Zhao
Summary: Molasses have a significant effect on the bioremediation of Cr(VI) contaminated groundwater, stimulating its reduction and reducing toxicity on bacteria. Molasses has a higher removal efficiency compared to glucose or emulsified vegetable oil, with a higher remediation concentration and faster removal rate.
Article
Chemistry, Applied
Bidemi Fashina, Youjun Deng
Summary: This study evaluates the potential of three clay minerals (smectite, sepiolite, and palygorskite) in binding and degrading pyocyanin, an important virulence factor in the resistance of Pseudomonas aeruginosa to antibiotics. The results show that these clay minerals have the ability to adsorb pyocyanin, with different binding sites and capacities. However, the clay minerals do not degrade pyocyanin, but instead slightly transform its structure on their surfaces.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Engineering, Environmental
Jianping Lu, Rongyue Geng, Han Zhang, Zhen Yu, Tao Chen, Baogang Zhang
Summary: The coexistence of chromium (VI) and uranium (VI) in groundwater poses severe risks to human health. This study explores the concurrent removal of Cr(VI) and U(VI) using zerovalent iron (Fe(0)) as an electron donor. The results show that Fe(0) can effectively remove both Cr(VI) and U(VI), reducing them to less mobile and insoluble forms. Microbial communities, including Delftia, Acinetobacter, Pseudomonas, and Desulfomicrobium, play a crucial role in mediating the bioreduction process. The study also observed the enrichment of genes related to Cr(VI) resistance, U(VI) reduction, and Fe(II) oxidation, indicating the involvement of specific microbial activities.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Husna, Anwar Hussain, Mohib Shah, Muhammad Hamayun, Muhammad Qadir, Amjad Iqbal
Summary: Heavy metal contamination is a major abiotic stressor in modern agricultural practices, threatening sustainable agriculture and crop productivity. The use of microbes in bioremediation offers a novel approach to enhance crop resilience to metal stress and restore soil ecosystems.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Bo Zhang, Wentao Jiao
Summary: Biochar can facilitate the microbial reduction of various pollutants in soil and groundwater. This study investigated the impact of biochars on Cr(VI) reduction by dissimilatory metal reducing bacteria (DMRB). The results showed that biochars abiotically reduced Cr(VI), which decreased its toxicity to the bacteria, but did not enhance the reduction when added simultaneously with the bacteria. The reaction rates between bioreduced biochars and Cr(VI) were relatively sluggish compared to direct Cr(VI) reduction by the bacteria.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Bei Ou, Hui Wang, Keke Xiao, Yuwei Zhu, Yuan Liu, Sha Liang, Huijie Hou, Wenbo Yu, Jingping Hu, Jiakuan Yang
Summary: The potential synergistic effects of iron-rich biochar and Pseudomonas aeruginosa (PA) in reducing Cr(VI) were systematically explored in this study. The results showed that the biochar produced at 300°C (Fe-300) was more efficient at reducing Cr(VI) than that produced at 800°C (Fe-800), and the presence of PA further enhanced its performance. The synergistic effects were mainly attributed to the increased release of phosphorus from Fe-300 by PA and the proteins extracted from PA.
Article
Engineering, Environmental
Chao He, Baogang Zhang, Yufeng Jiang, Huan Liu, He-Ping Zhao
Summary: Microbial electrolysis cell (MEC) produced biogas can effectively promote Cr(VI) detoxification, offering a promising route for sustainable bioremediation of Cr(VI)-polluted groundwater.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Environmental Sciences
Zhijie Bao, Huiyu Feng, Wenying Tu, Lijiao Li, Qiang Li
Summary: Heavy metal pollution, particularly chromium pollution, poses a major threat to human health and the environment. Various methods, including physical, chemical, biological, and biochar methods, can be implemented to remove chromium contamination in soil, offering valuable insights for future research and treatment.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Tianyuan Gu, Wenjing Niu, Yongming Wu, Lili Huo, Zulfiqar Ahmad, Mi Deng, Hua Zhong
Summary: Molasses has potential for both chemical reduction and bioreduction of Cr(VI) in groundwater. Low concentration of molasses can significantly enhance bioreduction of Cr(VI) and outperforms sucrose. Bacillus sp., isolated from the site soils, can reduce Cr(VI) using molasses as the sole carbon source.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Hao-Tian Mao, Lun-Xing Chen, Meng-Ying Zhang, Qiu-Yun Shi, Hong Xu, Da-Yan Zhang, Zhong-Wei Zhang, Ming Yuan, Shu Yuan, Huai -Yu Zhang, Yan-Qiu Su, Yang -Er Chen
Summary: In this study, R. sphaeroides SC01 and melatonin were employed to remove hexavalent chromium from wastewater. The results showed that exogenous melatonin could alleviate oxidative damage, enhance the absorption capacity of cell membranes, and improve the reduction efficiency of hexavalent chromium. Melatonin application led to significant upregulation of ascorbic acid, glutathione, and cysteine, and promoted the bioprecipitation of CrPO4·6H2O. These findings highlight the important role of melatonin in the reduction and uptake of hexavalent chromium, making it a promising strategy for the remediation of contaminated wastewater by photosynthetic bacteria.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Mingmao Yu, Jing Feng, Qian Yang, Zhi Dang, Lijuan Zhang
Summary: A novel passivator (PTATP@HQ) with self-healing function was prepared to inhibit the oxidation of pyrite, showing potential in improving passivation performance.
Article
Chemistry, Multidisciplinary
Ziliang Wei, Haolin Xu, Zhenchao Lei, Xiaoyun Yi, Chunhua Feng, Zhi Dang
Summary: A binder-free and self-supporting three-dimensional porous electrode was successfully fabricated for the electro-Fenton process, exhibiting high catalytic performance and stability in removing organic pollutants from wastewater.
CHINESE CHEMICAL LETTERS
(2022)
Article
Engineering, Environmental
Zecong Ding, Yang Ding, Fu Liu, Jianjun Yang, Rong Li, Zhi Dang, Zhenqing Shi
Summary: This study investigated the sorption and oxidation of soil dissolved organic matter (DOM) on birnessite at both the microscopic and molecular levels. The results provided molecular evidence for the transformation of soil DOM by birnessite, highlighting the significance of organo-mineral associations in the reactivity of organic carbon.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Lu Jiang, Pingxiao Wu, Yijing Xu, Yihao Li, Meiqing Chen, Zubair Ahmed, Nengwu Zhu
Summary: This study investigates the impact of ammonium ion (NH4+) on triclinic birnessite (TB) in the transformation of arsenite (As(III)). The presence of NH4+ significantly enhances the removal efficiency and oxidation rate of As(III) by TB. The improved oxidation state of Mn and the increase of oxygen vacancy due to the coexistence of NH4+ contribute to the advanced As(III) oxidation capacity of TB. The larger specific surface area of TB also enhances the oxidation capacity of As(III). This study provides a fundamental understanding of the behavior of TB with ammonium ion towards the transformation of As(III) in the environment.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Xiaorong Wei, Nengwu Zhu, Junlin Huang, Naixin Kang, Fei Li, Pingxiao Wu, Zhi Dang
Summary: The fusion of precious metal biorecovery with biomass fabrication resulted in the successful synthesis of Pd/Fe@biomass, which showed high efficiency in the reduction of Cr(VI) with a significantly larger specific surface area compared to nZVI.
ENVIRONMENTAL RESEARCH
(2022)
Article
Geochemistry & Geophysics
Qian Yao, Chuling Guo, Xiaofei Li, Xiaohu Jin, Guining Lu, Xiaoyun Yi, Weilin Huang, Zhi Dang
Summary: This study investigates the combined effects of oxalic acid and solar radiation on substituted Cr(III) schwertmannite under acidic conditions, revealing the significant role of oxalic acid in controlling the cycling of Fe/C and heavy metal elements in the AMD-contaminated environment.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Environmental Sciences
Yihao Li, Xiaoshan Qiu, Meiqing Chen, Pingxiao Wu, Heng Bai, Wenchao Niu, Ahmed Zubair, Jianxi Zhu, Zhi Dang
Summary: The study found that fulvic acid-like compounds of DOM were mainly fractionated on the surface of ferrihydrite, further inhibiting its transformation. Bracewellite (CrO(OH)) was generated as an accompanied mineral during the transformation of ferrihydrite in the presence of Cr(VI). These findings provide a basis for accurately predicting the fate of trace elements and iron minerals.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Quanyun Ye, Chenhui Liu, Pingxiao Wu, Jiayan Wu, Lin Lin, Yihao Li, Zubair Ahmed, Saeed Rehman, Nengwu Zhu
Summary: This study investigated the physicochemical and photocatalytic properties of two types of stannate perovskite oxides. The results showed that MgSnO3 exhibited better photocatalytic performance than CaSnO3. MgSnO3 effectively degraded DMP and DEP through the involvement of superoxide ions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Pengling Shao, Hua Yin, Yingchao Li, Yuhao Cai, Caiya Yan, Yibo Yuan, Zhi Dang
Summary: In this study, a biochar supported FeMnMg layered double hydroxide composite was prepared and used for the simultaneous remediation of copper and arsenic contamination in water and soil. The results showed that the composite exhibited good adsorption performance for heavy metals and could reduce the availability of heavy metals in soil. Additionally, the addition of the composite enhanced the activity of soil microorganisms, indirectly promoting the passivation and stabilization of heavy metals.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Engineering, Environmental
Weiqing Shen, Nengwu Zhu, Yunhao Xi, Junlin Huang, Fei Li, Pingxiao Wu, Zhi Dang
Summary: The study highlights the potential of using medical waste incineration fly ash as an additive to enhance chlorination volatilization of heavy metals in municipal solid waste incineration fly ash and medical waste incineration slag, thereby improving the disposal efficiency.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Zhanyu Guo, Heyang Zhou, Hua Yin, Xipeng Wei, Zhi Dang
Summary: This study investigated the effect of biochar on the biodegradation of BDE-47 and explored the interaction and assembly mechanism of the functional bacterial consortium QY2. The results showed that the addition of biochar significantly increased the biodegradation efficiency of BDE-47 by QY2. The presence of biochar promoted electron transfer in the biofilm through the strong interaction with redox-active extracellular polymeric substances (EPS), leading to enhanced debromination degradation of BDE-47. The assembly model and molecular ecological networks analysis revealed that the bacterial community assembly in biofilms was mainly driven by deterministic processes, resulting in higher biodiversity and broader habitat niche breadth for QY2 in response to BDE-47 disturbance.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Yan Pan, Yuanqi Fu, Sijia Liu, Tengfei Ma, Xueqin Tao, Yao Ma, Sheng Fan, Zhi Dang, Guining Lu
Summary: This study investigated the migration of Cu and Cd fractions in unpolluted paddy soil following treatment with acid mine drainage (AMD). The results showed that the highly mobile fractions of Cu and Cd significantly increased during AMD flooding, leading to a notable increase in the total content of these metals in the soil. Scanning electron microscopy identified changes in the distribution of elements in the soil, with Fe appearing to aggregate.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Xinrui Hao, Jie Tang, Xiaoyun Yi, Kun Gao, Qian Yao, Chunhua Feng, Weilin Huang, Zhi Dang
Summary: The study reveals the important role of vivianite in the geochemical cycling of phosphorus and iron elements in natural environments, with extracellular polymeric substances (EPS) identified as a phosphorus source that promotes vivianite formation. EPS plays a key role in iron reduction and concentrating phosphorus in ecosystems with quiescent conditions.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2022)
Article
Environmental Sciences
Pengcheng Lin, Hang Liu, Hua Yin, Minghan Zhu, Haoyu Luo, Zhi Dang
Summary: The combined pollution of heavy metals is a global issue. It has been found that loading Mn/Al-layered double oxide onto crab shells biochar can help remediate the combined pollution of Cd and Cu in soil and water. The research shows that LDO/BC exhibits highly efficient performance in remediating e-waste-contaminated soil and reducing the bioavailability of heavy metals.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)