Article
Chemistry, Physical
Sharifur Rahman, Chanaka M. Navarathna, Naba Krishna Das, Jacinta Alchouron, Parker Reneau, Sean Stokes, Rooban V. K. G. Thirumalai, Felio Perez, E. Barbary Hassan, Dinesh Mohan, Charles U. Pittman, Todd Mlsna
Summary: This study demonstrates that the combination of Fe-Mg layered double hydroxides with biochar shows great potential for efficiently adsorbing phosphate from water, even in the presence of other anionic contaminants. Additionally, regeneration of the adsorbents can be achieved by stripping with a 1 M NaOH solution.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Alexandra E. P. Schellenger, Sunho Choi, Annalisa Onnis-Hayden, Philip Larese-Casanova
Summary: The study demonstrates that pyroaurite-type minerals can immobilize selenium oxyanions from water resources, with uptake efficiency influenced by the identity of interlayer anions. The uptake process involves a rapid anion exchange followed by slow release, with excess dissolved interlayer anions and high pH values exacerbating the release of selenium.
APPLIED CLAY SCIENCE
(2021)
Article
Engineering, Chemical
Glenn B. Crisler, Cintly Guzman Hernandez, Andre Orr, Roger Davis, Timothy Schauwecker, J. Casey Johnson, Darrell Sparks, Ashli Brown, Kelcie Wilding, Chanaka Navarathna, Todd Mlsna
Summary: This study compares the phosphate adsorption abilities of slag and Al/Mg oxide modified Douglas fir biochar (AMOB) for simulated agriculture run-off remediation in wetlands. The results show that the two materials have different phosphate removal mechanisms at different residence times. Biochar has a larger surface area and better adsorption performance. Slag removes phosphate through slow leaching of metal phosphates.
Article
Engineering, Environmental
Quanyun Ye, Jiayan Wu, Pingxiao Wu, Saeed Rehman, Zubair Ahmed, Nengwu Zhu
Summary: Efficient and low-cost catalysts for peroxymonosulfate (PMS) activation are essential for pollution prevention and environmental remediation. In this study, biochar (BC) was composited with CoFe layered double hydroxide (CoFe-LDH) to achieve enhanced PMS activation. The synergistic effect between BC and CoFe-LDH resulted in improved catalytic activity and stability, leading to higher production of reactive oxygen species (ROS) in the BC-LDH/PMS system. The degradation efficiency of dimethyl phthalate (DMP) was significantly higher in the BC-LDH/PMS system compared to the CoFe-LDH/PMS system, reaching 100% within 60 minutes.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Jesslyn K. E. Tan, P. Balan, N. Birbilis, G. Manivasagam
Summary: A new synthesis approach was developed for the electrodeposition of Mg-Fe layered double hydroxide (LDH) film on oxidised magnesium alloy WE43 surface. The Mg(OH)(2) surface layer altered the morphology of LDH film, resulting in structured LDH nanoplates. The Mg-Fe LDH film exhibited improved corrosion resistance and impedance performance.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Biotechnology & Applied Microbiology
Shuqi Li, Xiaolong Ma, Zichuan Ma, Xutong Dong, Ziye Wei, Xinyu Liu, Longpan Zhu
Summary: In this study, modified almond shell biochar (ASB) with different Mg/Al ratios was prepared using a two-step wet impregnation method, with ASB-3 showing the highest adsorption rates for phosphate and nitrate. ASB-3 exhibited larger specific surface area and total pore volume, as well as improved adsorption kinetics, affinity, and capacity for phosphate and nitrate.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Chemistry, Physical
Jian-dong Zuo, Zhi-cheng Peng, Bi-qin Dong, Yan-shuai Wang
Summary: In this study, Mg-Fe LDH film was successfully grown on steel substrates using a hydrothermal method, with the optimal growth conditions as an initial pH value of 10, Mg2+/urea ratio of 1:4, and a reaction time of 12 hours. Characterization techniques including X-ray diffraction, scanning electron microscopy, and electrochemical impedance spectroscopy confirmed the excellent corrosion resistance properties of the Mg-Fe LDH film.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Metallurgy & Metallurgical Engineering
Jun Chen, Ju Feng, Lei Yan, Huan Li, Changqi Xiong, Sude Ma
Summary: In this study, an environment-friendly layered double hydroxide (LDH) film was deposited on MgCa alloy using a two-step technique. Batch studies were conducted to optimize the film properties, revealing that factors such as pH value, treatment temperature, and immersion time significantly impact the film's purity and corrosion resistance. The optimal process involved forming a precursor film at pH 5 and then converting it to Mg-Fe LDH film at pH 11.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Environmental Sciences
Guifang Liu, Yuhan Liu, Dongliang Chen, Chunli Wang, Weiting Guan
Summary: In this study, a novel heterogeneous catalyst CoMgFe-LDH was prepared for efficient activation of PMS to oxidize RhB. The CoMgFe-LDH/PMS process showed good capacity to remove RhB and exhibited excellent stability. Sulfate radicals (SO4-) were found to be the dominant reactive species.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Choe Earn Choong, Kien Tiek Wong, Seok Byum Jang, Pichiah Saravanan, Chulhwan Park, Sang-Hyoun Kim, Byong-Hun Jeon, Jaeyoung Choi, Yeomin Yoon, Min Jang
Summary: The study focused on controlling the particle size and aggregation of nanosheet layers in LDHs for effective As(III) and As(V) removal. The PAM(40)/PVA(30)-LDH showed higher affinity and maximum adsorption capacities for As(III) and As(V) compared to LDH alone. X-ray photoelectron spectroscopy analysis revealed the mechanisms of As(III) and As(V) removal on PAM(40)/PVA(30)-LDH, making it a promising adsorbent for arsenic-polluted wastewater treatment.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Physical
Dongdong Zhang, Ji Tan, Huihui Du, Shi Qian, Xuanyong Liu
Summary: The study revealed that the ferric hydroxide coating on magnesium alloy exhibited the best corrosion resistance and surpassed other coatings in terms of biocompatibility. This suggests that the ferric hydroxide coating could serve as a novel potential coating for modification of magnesium-based implants.
APPLIED CLAY SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Atin Nuryadin, Tsuyoshi Imai, Ariyo Kanno, Koichi Yamamoto, Masahiko Sekine, Takaya Higuchi
Summary: The study demonstrated the efficient removal of phosphate from wastewater using amorphous-ZrO2/Mg-Fe LDH composite, highlighting its superior adsorption performance compared to individual LDH and ZrO2. Further research is ongoing to explore the composite's application in real wastewater and the mechanism of phosphate adsorption on its surface.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Agricultural Engineering
Xiaoying Li, Tian Gan, Jiaen Zhang, Zhaoji Shi, Ziqiang Liu, Zeheng Xiao
Summary: In this study, ZnFe-LDH/MBC, synthesized from Mikania micrantha Kunth-derived biochar and Zn/Fe layered double hydroxide (LDH), demonstrated excellent performance in removing oxytetracycline (OTC) from water. ZnFe-LDH/MBC exhibited stability and efficiency in OTC adsorption at different pH levels and under interfering conditions with co-existing ions, as well as outstanding regeneration capabilities during adsorption-desorption cycles. The removal of OTC by ZnFe-LDH/MBC involved several processes, including pore filling, hydrogen bonding force, electrostatic interaction, pi-pi interaction, and complexation.
BIORESOURCE TECHNOLOGY
(2022)
Article
Chemistry, Physical
Zilin Meng, Jiaxuan Fan, Xiaoyan Cui, Yumei Yan, Ziwei Ju, Runhua Lu, Wenfeng Zhou, Haixiang Gao
Summary: The N8881Cl-LDH@Fe3O4 synthesized in this study exhibited strong adsorption capability for perchlorate. The adsorption process was rapid and not influenced by pH and co-existing anions.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Environmental
Tongtong Wang, Di Zhang, Kaikai Fang, Wei Zhu, Qin Peng, Zhigang Xie
Summary: The study demonstrated that the modified composite biochar shows good adsorption performance for nitrate wastewater, with significantly increased adsorption capacity and removal rate. The adsorption mechanisms involve various physical-chemical composite processes such as surface adsorption, diffusion, and ion exchange.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Chaojin Jiang, Xiaoqian Jiang, Lixun Zhang, Yuntao Guan
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2020)
Article
Environmental Sciences
Lixun Zhang, Fangxin He, Wei Mao, Yuntao Guan
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Environmental Sciences
Bo Zhao, Norihide Nakada, Seiya Hanamoto, Lixun Zhang, Yongjie Wong
Summary: This study conducted meta-data analysis to model the in-stream attenuation of DBPs in a river, revealing that photo-irradiation and water temperature were the main factors affecting the degradation of NDMA and FAH, respectively. The developed models provide a useful tool for estimating the levels of NDMA and FAH during river transportation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Wei Mao, Lixun Zhang, Tianye Wang, Yichen Bai, Yuntao Guan
Summary: A visible-light-driven Bi2WO6/CuS p-n heterojunction with high photocatalytic activity was fabricated to simultaneously remove pollutants in a mixed system containing RhB, TCH, and Cr(VI). The presence of dissolved organic matter significantly promoted the removal of TCH and Cr(VI) by accelerating the separation of electrons and holes. The p-n heterojunction formed in Bi2WO6/CuS acted as a bridge to shorten the electron transport and increase the removal efficiencies of both reducing and oxidizing pollutants in wastewater.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2021)
Article
Environmental Sciences
Wei Mao, Lixun Zhang, Yang Liu, Tianye Wang, Yichen Bai, Yuntao Guan
Summary: In this study, a novel Bi2WO6 loaded N, S co-doping corn straw biochar was successfully synthesized for the removal of ciprofloxacin and Cr(VI) in water purification. The composite showed efficient catalytic removal under visible light irradiation, with high removal efficiencies and wide applicability in different pH and coexisting ions conditions. The enhanced photocatalytic activity is attributed to the synergistic effects of Bi2WO6 and NSBC, optimizing band gap and visible light response for efficient utilization of photoinduced carriers.
Article
Environmental Sciences
Lixun Zhang, Sunny C. Jiang, Yuntao Guan
Summary: A new composite material composed of poly(allyltrimethylammonium) grafted chitosan and biochar was introduced for efficient removal of selenate from water, exhibiting rapid and high-capacity adsorption with a pseudo-second-order kinetics model. The material showed great potential for removing anionic heavy metal ions due to its high efficiency and versatile application in a wide pH range. The main mechanisms of selenate removal were attributed to electrostatic interactions and redox-complexation interactions with specific functional groups on the composite.
ENVIRONMENTAL RESEARCH
(2021)
Article
Engineering, Environmental
Lixun Zhang, Yuntao Guan
Summary: The study introduces a new soil amendment, PAA/CTS/BC, which simultaneously improves nitrogen cycling and immobilizes heavy metals in soil. The amendment promotes soil ammonium retention, reduces nitrate accumulation, nitrous oxide emission, and ammonia volatilization during rice cultivation. It also significantly decreases the availability of various heavy metals in the soil, altering the structure and function of soil microbial communities, leading to a complex and function-specific network of microbial communities. The findings suggest a promising strategy for crop production improvement, pollution control, and climate change mitigation.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Lixun Zhang, Yuntao Guan, Sunny C. Jiang
Summary: Soil ammonia oxidation is a key process in the nitrogen cycle of agriculture, driven by various autotrophic ammonia oxidizers. Both AOA, AOB, and feammox were found to play important roles in ammonia oxidation in rice soils. Environmental factors influence the abundance and activity of these microbes, with heavy metals negatively impacting soil nitrogen management.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Huoqing Wang, Yuepeng Sun, Lixun Zhang, Wenying Wang, Yuntao Guan
Summary: This study found that rain gardens with internal water storage design showed significantly higher nitrogen removal efficiency and lower N2O emission potential compared to conventional rapid-filtration rain gardens. In terms of microbial composition, there were significant differences at the genus level between the two types of rain gardens, especially in potential denitrifying genera.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Soil Science
Lixun Zhang, Yuntao Guan
Summary: Soil bacterial communities are significantly affected by silicon fertilization and the depletion of bioavailable silicon in agricultural soils is a pressing issue. The structure of bacterial communities in Si-deficient soils showed significant correlations with reactive Si content and changes in bacterial groups related to nutrient cycling were observed. This highlights the importance of improving agricultural silicon fertilization for agro-ecosystem health and sustainability.
Article
Environmental Sciences
Yang Liu, Lixun Zhang, Zhengfang Zhang, Ying Zhang, Yuntao Guan
Summary: This study introduced a novel citrate-modified biochar as a soil conditioner to increase plant-available silicon and immobilize heavy metals. The biochar pre-treated with 0.1 mol.L-1 citrate showed optimal adsorption capacity for Cu, with mechanisms involving surface precipitation, surface complexation, electrostatic attraction, and hydrogen bonding. Our research suggests the potential of these materials for addressing silicon deficiency and heavy metal contamination issues in agro-ecosystems.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Chemistry, Multidisciplinary
Wei Mao, Lixun Zhang, Ying Zhang, Yuntao Guan
Summary: By preparing Mn/SA-BC@nZVI composite, the simultaneous removal of As(iii) and Cd(ii) from contaminated water can be efficiently achieved, with significant removal efficiencies and high adsorption capacities.
ENVIRONMENTAL SCIENCE-NANO
(2022)
Article
Environmental Sciences
Wei Mao, Lixun Zhang, Ying Zhang, Yanfei Wang, Nuanling Wen, Yuntao Guan
Summary: In this study, a new carbonized manganese-crosslinked sodium alginate material was developed for the efficient removal of arsenite, arsenate, and hexavalent chromium in water. The material exhibited rapid adsorption of arsenite and arsenate, and the removal efficiency could be significantly enhanced by coupling with a photocatalytic process. The removal mechanisms involved surface complexation, precipitation, reduction, and complexation reactions.
Article
Engineering, Environmental
Lixun Zhang, Fangxin He, Yuntao Guan
Summary: The use of DDTC-LDH as a remediation agent can rapidly reduce the content of hexavalent chromium in contaminated soil and promote the growth of water spinach, while altering the structure and function of soil microbial communities.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Lixun Zhang, Shengyin Tang, Yuntao Guan
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2020)