Article
Engineering, Environmental
Zequan Liu, Tao Ou, Minhua Su, Hairong Peng, Gang Song, Lingjun Kong, Diyun Chen
Summary: The study emphasizes the critical role of solution pH in the retention of U(VI) by alpha-/gamma-alumina, with gamma-Al2O3 showing higher removal efficiency. Phosphate ions significantly promote U(VI) adsorption, while humic acid has different effects on U(VI) removal by alumina under different conditions.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Yangyang Zhang, Jeremy B. Fein, Yilian Li, Qiang Yu, Bo Zu, Chunli Zheng
Summary: The study demonstrated that LHA-coated Fe3O4 nanoparticles exhibit pH-dependent U(VI) adsorption and follow the pseudo-second-order kinetic model, with good recoverability for adsorption. The adsorption mechanism involves both Fe surface sites and oxygen-containing groups, with binding onto carboxyl sites dominating at the highest extents of LHA coating.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Esraa M. Bakhsh, Sher Bahadar Khan, Kalsoom Akhtar, Ekram Y. Danish, Taghreed M. Fagieh, Chen Qiu, Yiwei Sun, Valentin Romanovski, Xintai Su
Summary: In this study, humic acid (HA) and mesoporous SiO2 were synthesized and used as adsorbents for uranium adsorption from aqueous solution. The adsorption behaviors of HA and mesoporous SiO2 were investigated and analyzed, and it was found that both materials exhibited excellent adsorption performance, contributing to the high-value utilization of municipal sludge and the environmental benefit of uranium adsorption.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Physical
Yangyang Zhang, Jeremy B Fein, Qiang Yu, Dongsheng Liu, Yuzhao Feng, Bo Zu, Chunli Zheng
Summary: The study investigated the adsorption characteristics of lignite humic acid-coated magnetite nanoparticles for U(VI), demonstrating that the adsorption of U(VI) is influenced by dissolved inorganic carbon and ionic strength under certain conditions. A model for surface complexation was established to predict the behavior of U(VI) in complex systems with a wide range of pH, ionic strength, DIC, and solute: sorbent conditions.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Environmental Sciences
Lingling Wang, Dionysios D. Dionysiou, Jianming Lin, Yuxian Huang, Xiaolan Xie
Summary: The research found that humic acid and Cr(VI) displayed synergy in their removal process by ZnO-30N-zeolite, accelerating the removal of humic acid significantly while not affecting the removal capacity of Cr(VI). This study proposed a kinetic mechanism for the synergistic removal of humic acid and Cr(VI) by ZnO-30N-zeolite in a binary pollutant system.
Article
Environmental Sciences
Yanan Chen, Yunkun Qian, Jiaxin Ma, Mengjun Mao, Linping Qian, Dong An
Summary: This study systematically evaluated the concurrent adsorption of humic acid (HA) and hexavalent chromium (Cr(VI)) by powdered activated carbon (PAC) in water. It was found that the presence of humic acid significantly enhanced the adsorption of both HA and Cr(VI). The promotion effect of humic acid on Cr(VI) removal was found to decrease with increasing pH. The cooperative adsorption mechanism was attributed to the formation of Cr(VI)-HA and Cr(III)-HA complexes that were readily adsorbed on the PAC surfaces.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Physical
Tingting Li, Qian Wang, Chang Zhu, Xiaoxiao Huang, Gang Yang
Summary: The reduction of U(VI) to less soluble U(IV) species on mineral surfaces is a promising approach for remediating uranium contamination. Fe(II) is found to play a more reactive role than humic acid (HA) in this reduction process, and the extent of U(VI) reduction is determined by the Fe(II) content (n). When both HA and Fe(II) are present, two distinct mechanisms are observed: spectator mode, where only one acts as a reducing agent, and combined action mode, where both contribute to the reduction process.
SURFACES AND INTERFACES
(2021)
Article
Engineering, Environmental
Jingjie Chang, Jia Zhang, Hui Wang, Yunfei Bai, Yu Liu, Yanze Bi, Huanzhen Zhang, Honghan Chen, Samuel Barnie, Haijiao Xie
Summary: This study found that magnetite-humic acid adsorption complexes (MHAs) have antagonistic adsorption and synergistic reduction effects on Cr(VI). Raman mapping characterization showed that the surface of MHAs is extremely heterogeneous, consisting of two types of sites. The coverage of magnetite surface by HA depresses its adsorption and reduction, while the HA component at site (A) exhibits synergistic reduction of Cr(VI).
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Jie Song, Lijun Chen, Yuhua Niu, Zhiqiang Wei, Yonghui Sun
Summary: From the perspective of environmental protection, a high removal rate, reusable, and degradable amino-functionalized porous hydrogel material P-(EA-beta-CD/KHA/AC) was synthesized. This material showed high adsorption capacity for MB and Cr(VI), with adsorption capacities as high as 262.31 mg/g and 170.12 mg/g, respectively, and removal rates of 98.96% and 70.27%, respectively, at 298 K and pH 8. The adsorption behavior followed the pseudo-second-order kinetic equation and conformed to the Langmuir model, forming an entropy-increasing, endothermic, and spontaneous process through intermolecular forces, pi-pi conjugation, chelation, and other interactions. The regeneration and degradability experiments of P-(EA-beta-CD/KHA/AC) hydrogel were conducted, and its recycling performance was verified.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Engineering, Environmental
Hongtao Xia, Qi Ren, Jianqi Lv, Yang Wang, Zihao Feng, Yang Li, Changfu Wang, Yan Liu, Yun Wang
Summary: An innovative chitosan/graphene oxide composite containing phytic acid (PCG) was synthesized for the removal of uranium (VI) from aqueous solutions. PCG possessed flaky surface porous structure, good thermal stability, and strong chelating ability to uranium (VI). The adsorption process of PCG followed the Langmuir isothermal and pseudo-second-order kinetic models, with a maximum adsorption capacity of 325.56 mg/g at pH 5.0. PCG exhibited higher adsorption selectivity due to the strong chelating of its hydroxyl and phosphate groups with uranium (VI). With its easy synthesis, solid-liquid separation, biocompatibility, and negligible toxicity, PCG can effectively recover uranium (VI) from wastewater.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Analytical
Aly A. Helal, I. M. Ahmed, R. Gamal, S. A. Abo-El-Enein, A. A. Helal
Summary: This study investigated the removal of U(VI) using iron oxide nanoparticles (Fe3O4) and iron oxide nanoparticles with humic acid coatings (Fe3O4/HA). The effects of contact time, adsorbent mass, U(VI) concentration, and pH were studied using batch technique. The results showed that humic acid coatings decrease the sorption capacity of magnetite due to the formation of a polyanionic organic coating, altering the surface properties of the particles, reducing magnetite aggregation, and stabilizing magnetite suspension.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2022)
Article
Engineering, Environmental
S. Priya, P. Ilaiyaraja, N. Priyadarshini, N. Subalekha
Summary: A facile method to synthesize a magnetic nanocomposite as an efficient adsorbent for uranium removal from water was reported. The material exhibited high adsorption capacity, selectivity, and convenience for separation and recycling.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Environmental Sciences
Hongliang Bao, Chunyu Xie, Ling Han, Zenghui Yue, Yuan Qian, Linjuan Zhang, Zi-Jian Li, Huangjie Lu, Jian Lin, Jian-Qiang Wang
Summary: Oxidized carbon foam showed fast sorption kinetics and high sorption capacity for U(VI) after oxidation treatment, with carboxyl groups introduced as sorption sites. Analysis using energy-dispersive X-ray spectroscopy and extended X-ray absorption fine structure spectroscopy revealed the coordination of UO22+ cation with carboxyl groups on the surface of oxidized CF.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Biochemistry & Molecular Biology
Yan Wang, Yong Zhang, Xiaolin Liu, Sen Sun, Shiyi Qin, Jiaqi Huang, Bowei Chen
Summary: In this study, a novel g-C3N4 filled, phosphoric-crosslinked chitosan gel bead (P-CS@CN) was developed for the adsorption of U(VI) from water. The introduction of more functional groups improved the separation performance of chitosan. At pH 5 and 298 K, the adsorption efficiency and capacity reached 98.0% and 416.7 mg g-1, respectively. The P-CS@CN gel bead exhibited excellent applicability in water based on dynamic adsorption experiments. Thermodynamic analyses showed that the adsorption process of U(VI) on P-CS@CN was spontaneous and endothermic.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Review
Environmental Sciences
Sourav Prusty, Prathap Somu, Jitendra Kumar Sahoo, Debasish Panda, Sunil Kumar Sahoo, Shraban Kumar Sahoo, Yong Rok Lee, T. Jarin, L. Syam Sundar, Koppula Srinivas Rao
Summary: Groundwater contamination, particularly the pollution caused by nuclear power plants and their by-products, is a significant concern. Adsorption has emerged as a simple, effective, and cost-efficient method for addressing this issue.
Article
Environmental Sciences
Yongbing Cai, Ning Xu, Fande Meng, Feiyue Li, Yue Xie, Hua Zhang
Summary: The study revealed high leaching amounts of zinc and cadmium from river sediments contaminated by gold mining, with different kinetic characteristics. Weak acid extractable forms and particle size differences were important factors affecting the release of zinc and cadmium in sediments.
WATER AIR AND SOIL POLLUTION
(2021)
Article
Environmental Sciences
Xingjun Fan, Chao Liu, Xufang Yu, Yan Wang, Jianzhong Song, Xin Xiao, Fande Meng, Yongbing Cai, Wenchao Ji, Yue Xie, Ping'an Peng
Summary: The study comprehensively investigated the metal-binding characteristics of water-soluble organic matter emitted from biomass burning with Cu(II) under various pH conditions. The results showed that pH was a sensitive factor affecting the binding affinities of WSOM, and protein-like substances generally exhibited a higher susceptibility and preferential interaction with Cu(II) than fulvic-like substances. This study enhances our understanding of the binding behaviors of BB WSOM with Cu(II) in relevant atmospheric environments.
Article
Plant Sciences
Liang Xiao, Guodong Yuan, Lirong Feng, Ghulam Mustafa Shah, Jing Wei
Summary: The study suggests that biochar can alleviate salt stress in salt-affected soil and maintain crop yields even with reduced fertilizer use. Biochar reduces soil bulk density, increases water retention capacity, and improves the impact of salt stress on crops. It also enhances nutrient supply and improves the uptake of K+ by crops, resulting in higher grain K/Na ratios. The combination of biochar and reduced fertilization can increase soil nutrient supply and crop yields.
JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION
(2022)
Article
Environmental Sciences
Fande Meng, Qiuxiang Huang, Yongbing Cai, Feiyue Li, Guodong Yuan
Summary: The study found that biochar can affect the dynamic behavior of soil properties and metal fractions, decrease bioavailable Cd content, and lower the potential risk of heavy metals.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Agronomy
Guodong Yuan, Dongxue Bi, Jing Wei, Liang Xiao
Summary: Soil acidification in the subtropical region reduces soil productivity and increases the bioavailability of heavy metal(loid)s in soil. This study aimed to remediate an acidic soil contaminated by cadmium (Cd) and arsenic (As) using a Ca-humic complex formed from 800 degrees C-calcined oyster shell and leonardite-derived humic substance, for safe vegetable production. Results showed that a 2.0% dose of the complex significantly reduced Cd and As contents in vegetables, reducing the human health risk. The complex also lowered the bio-accessibility of Cd and As in soil, reducing the human health risk from soil ingestion. The use of oyster shell waste to produce Ca-humic complex as a soil amendment has agronomic and environmental benefits.
Article
Biotechnology & Applied Microbiology
Enzong Xiao, Weimin Sun, Zengping Ning, Yuqi Wang, Fande Meng, Jinmei Deng, Wenjun Fan, Tangfu Xiao
Summary: The study found that metal(loid) selection plays an important role in the dissemination of antibiotic resistance genes (ARGs) in mine soil ecosystems. Metal(loid)-induced coselection is mainly associated with resistance-nodulation-division (RND) antibiotic efflux. Metal(loid)s impose coselection pressure on multiple ARGs residing on mobile genetic elements (MGEs), promoting the dissemination of the antibiotic resistome.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Fande Meng, Qiuxiang Huang, Yongbing Cai, Guodong Yuan, Liang Xiao, Fengxiang X. Han
Summary: This study investigated the effects of different sources of humic acid (HA) on soil pH and uranium fraction transformation. The results showed that the source of HA had a significant impact on soil pH and the dynamic behavior of uranium fractions. Therefore, the source of HA and uranium should be considered when using HA as a remediation material for uranium-contaminated soils.
Article
Engineering, Chemical
Shasha Liu, Kaibo Huang, Guodong Yuan, Chengfang Yang
Summary: This study investigated the influences of polyethylene (PE) and phenanthrene (PHE) on soil ecosystems through a soil microcosm experiment. Results showed that the addition of PE and PHE affected soil chemical properties, enzymatic activities, and bacterial community diversity/composition. The significantly positive effect of PE on the nitrogen cycle and metabolic function led to notable changes in soil organic matter/nitrogen content and urease/FDAse activities.
Article
Environmental Sciences
Fande Meng, Qiuxiang Huang, Yongbing Cai, Liang Xiao, Teng Wang, Xiaoliang Li, Wenge Wu, Guodong Yuan
Summary: This study systematically investigated the effects of humic acid (HA) and biochar (BC) on the redistribution of Cd and As fractions in contaminated soil and found that HA can better reduce the potential risk of Cd and As. Furthermore, a higher dose of HA (L-HA3) showed better immobilization of Cd and As.
JOURNAL OF SOILS AND SEDIMENTS
(2023)
Article
Polymer Science
Guanhua Shen, Yanhua Zhao, Mingxin Ma, Yongli Wang, Xiangying Hao, Guodong Yuan
Summary: This study examined the influence of surface basicity on the effectiveness of layered double hydroxides (LDHs) as heat stabilizers for polyvinyl chloride (PVC). LDHs with different surface basicity were synthesized and characterized, and then combined with zinc stearate and dibenzoylmethane to create an environmentally friendly heat stabilizer for PVC. The resulting PVC composites were subjected to thermal stability testing, and the results showed that lower Mg/Al ratios and replacing Mg with Zn improved the initial whiteness and long-term thermal stability of the PVC composites. Further improvement was achieved by crosslinking the LDHs with a silane coupling agent.
Article
Agronomy
Liang Xiao, Jinghua Wu, Wenhan Li, Guodong Yuan, Qing Xu, Jing Wei, Fengxiang Han
Summary: Mineral coating technique can enhance the carbon capture capacity and specific surface area of biochar, improving its feasibility for carbon sequestration and climate change mitigation.
Article
Agronomy
Lina Wang, Jing Wei, Lu Yang, Yun Chen, Mengjie Wang, Liang Xiao, Guodong Yuan
Summary: The potential of a soluble humic substance derived from leonardite for copper removal from contaminated soils was explored in this study. The effects of different washing conditions on removal efficiency were assessed, and it was found that a single washing with the humic substance solution achieved an optimal removal efficiency of 37.5%. A two-step soil-washing approach using a chemical reductant NH2OH·HCl coupled with the humic substance solution further increased the removal efficiency to 53.0%.
