Gels
·
2024
·Vol. 10
·期 6
·392
·
IF 5
Juan Ye,Yanchun Yang,Li Zhang,Man Li,Yiling Wang,Yuxuan Chen,Ruhui Ling,Jiefeng Yan,Yan Chen,Jinxing Hu,Zhenxing Fang
Fly ash was used as raw material to prepare zeolites through silicate gels, assisted by the hydrothermal method. The silicate gels could be effectively formed in a few minutes in a molten alkali environment. The zeolites could be prepared by using these silicate gels through the hydrothermal method, which realizes the transformation from useless materials to highly valuable materials. The obtained zeolites were applied to the removal of ammonium in water, achieving the highvalue utilization of fly ash. The synthesized zeolites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrum (EDS), thermogravimetric (TG), and Fourier transform infrared (FTIR) spectroscopy. The study on the adsorption and removal of ammonium in water shows that the adsorption of ammonium is more in line with pseudo first-order kinetics, and the adsorption mainly occurs in the first 20 min. The adsorption can reach equilibrium in 30 min, and the maximum adsorption capacity can reach 49.1 mg/g. The adsorption capacity of ammonium has the best performance at pH = 5. Furthermore, within a certain range, an increase in temperature is beneficial for the removal of ammonium.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
Additive Manufacturing
·
2022
·
IF 11.632
Yan Li,Shuqiang Peng,Kunrong Li,Dan Qin,Zixiang Weng,Jiangwei Li,Longhui Zheng,Lixin Wu,Chang-Ping Yu
3D printing provides a new way of microbial immobilization technology and creates innovative designed bioactive structures containing microorganisms for remediation of environmental pollution. However, the bio-ink design remains a critical challenge due to the difficulty in creating a durable and bio-friendly material. Here, a novel dual-crosslinking PEGDA-Alginate-PVA-Nanoclay (PAPN) bio-ink containing one heterotrophic bacterium is reported for 3D printing functional biomaterial with the capabilities of ammonia removal. The results showed that PAPN 3D printed bio-scaffolds could effectively remove 96.2 ± 1.3% ammonia within 12 h, and the removal rate increased within repeated use owing to the growth of bacteria inside the bio-scaffolds. Preservation of the bio-scaffolds under room temperature without a culture medium for 168 h still maintained the microbial activity for ammonia removal. It is demonstrated that visible-light-based 3D printing procedures could maintain high cell viability for the majority of bacteria, and the porous structures of 3D bio-scaffolds could allow the permeability of nutrients for the growth of bacteria. This work demonstrates the potential of the dual crosslinked PAPN 3D bio-scaffold for the production and application of immobilized functional bacteria in wastewater treatment .
研究领域:
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Ming Yang,Ning Xiang,Yunan Tang,Yue Li,Ximing Zhang
Ammonia accumulation poses a major challenge in high-density cell production, including cultivated meat. This study presents sodium zirconium phosphate (NaZrP) as an efficient ammonia adsorbent, synthesized via a minimal solvent thermal method. In discarded culture medium, NaZrP reduced ammonium concentration by 56 % and maintained efficiency over four reuse cycles. At 0.5–2.5 g/L, it sustained over 90 % cell survival after 24 h, confirming biocompatibility. The addition of disodium hydrogen phosphate improved NaZrP’s properties by increasing layer spacing, ion adsorption rate, and adsorption capacity. Adsorption followed pseudo-second-order kinetics and the Langmuir model, indicating monolayer adsorption. Chemisorption was the dominant mechanism, with ion exchange occurring under weakly alkaline conditions. NaZrP exhibited minimal glucose adsorption and negligible impact on solution pH. Its rapid and selective ammonia removal, combined with reusability and cell compatibility, makes it a promising solution for managing ammonia toxicity in large-scale cell cultures. Further optimization will enhance its potential for cost-effective applications in cultivated meat and other biotechnological industries.
研究领域:
生物技术
·
细胞工程
·
食品科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yan Zhang,Youzhi Ji,Jinhua Li,Jing Bai,Shuai Chen,Linsen Li,Jiachen Wang,Tingsheng Zhou,Panyu Jiang,Xiaohong Guan,Baoxue Zhou
The efficient removal of ammonia is a difficult issue in wastewater treatment because ammonia is easily converted to nitrate instead of N 2 . The oxidation of ammonia by chlorine radical (Cl ) is recognized as an effective method. However, the massive generation of toxic byproducts chlorate and nitrate pose great risk for its practical application due to the excessive oxidation capacity of hydroxyl radical. Herein, we propose a novel method to selectively generate Cl for efficient ammonia removal using BiVO 4 /WO 3 photoanode in a self-driven photoelectrocatalytic (PEC) system. Cl was predominantly produced by regulating the valence band edge of WO 3 though modifying BiVO 4 , which tuned the moderate oxidative force of hole to reduce OH generation and thereby inhibited the formation of chlorate and nitrate. The self-driven ammonia degradation was achieved by employing BiVO 4 /WO 3 and Si photovoltaic cells as composite photoanodes to improve light-absorption and electron-hole separation, thus enhancing Cl production. These results showed that 10 mg L −1 of ammonia-N was completely removed (99.3 %) in 120 min with 80.1 % of total nitrogen removal. Toxic byproducts chlorate and nitrate were inhibited by 79.3 % and 31 %, respectively, compared to WO 3 . This work provides new insights to develop efficient, energy-saving and environment-friendly method for ammonia pollution treatment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Sha Yu,Yitian Qin,Qi Zhao,Mei Li,Haijun Yu,Guodong Kang,Yiming Cao
Nafion-PTFE hollow fiber composite membranes were applied in the ammonia removal and recovery with a novel aqueous-organic membrane contactor (AOMC) process, in which an aqueous solution and an organic solution were separated by the composite membrane. A kerosene-diluted di-(2-ethylhexyl) phosphoric acid (D2EHPA) solution was used to receive the ammonia, which could be recycled and reused after regeneration by the stripping agent (a dilute solution of H 2 SO 4 , HNO 3 , or H 3 PO 4 ). The new-type membrane contactor can avoid the accompanying water transport in conventional membrane contactors. The effects of experimental factors including the pH, the velocity and the initial ammonia concentration of the feed on the overall mass transfer of the ammonia were investigated. Meanwhile, how the regeneration experiment parameters influenced the stripping ratio was also studied. The results showed that the AOMC process was more favorable to treat ammonia feed with low ammonia concentrations. The ammonia removal could be over 99% under certain conditions. Additionally, the ammonia was concentrated 26.4 times after four cycles. It was found that the accompanying water transport was non-negligible in the traditional aqueous-aqueous membrane contactor (AAMC) process when treating ammonia feed of low concentrations, with the maximum water flux two orders of magnitude higher than ammonia.
研究领域:
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 27
·27235-27244
·
IF 2.8
Du Jifu,Dong Zhen,Yang Xin,Zhao Long
An adsorbent EVOH-g-SSS(H) was successfully synthesized for ammonium removal by one-step grafting SSS onto EVOH particles directly using radiation-induced grafting technique followed by protonation. The effects of adsorbed dose and monomer concentration on grafting yield were investigated. The adsorption behaviors of the EVOH-g-SSS(H) towards ammonium ions (NH 4 + ) were discussed. The adsorption isotherm of NH 4 + was a followed Langmuir model with the maximum adsorption capacity of 22.53 mg/g at optimal pH 6.5. For comparison, adsorption kinetics towards NH 4 + removal by EVOH-g-SSS(H) and commercially available DIAION PK228 were studied. Both adsorbents were better obeyed pseudo-second-order mode. EVOH-g-SSS(H) for NH 4 + uptake was faster than PK228 and reached equilibrium within 5 min. Column experiment showed that the column adsorption capacity of EVOH-g-SSS(H) adsorbent was 9.69 mg/g-ad at SV 10 h −1 . The NH 4 + concentration in outlet solution can maintain at a very low level even SV was as high as 800 h −1 . The elution curve showed the EVOH-g-SSS(H) adsorbent can be regenerated using 1 M HCl. Besides, the removal percentage of NH 4 + can be 97% from actual groundwater within 1 min. Such high adsorption efficiency of EVOH-g-SSS(H) makes it to be employed as an adsorbent for NH 4 + removal in practical application.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Wenjia Huang,Jiabai Cai,Jieyi Gong,Huan Li
Ammonia removal is an essential part of wastewater treatment, and complex biological processes are currently the mainstream, converting ammonia to N 2 with a large footprint and lengthy period. High-temperature (150°C or higher) and high-pressure catalytic oxidation were applied to ammonia conversion, which suffered high investment and operational costs. This study developed a low-temperature catalytic air oxidation process with a fabricated nanoscale Ru/Al catalyst. Through continuous reaction with pH adjustment, it achieved an ammonia conversion rate of 92.0 % at 90°C, with 72.8 % converted to N 2 . During the treatment, ammonia was converted to the key intermediate product N 2 H 2 , accompanied by a small amount of N 2 H 4 , and they were eventually turned into N 2 . In contrast, at 150°C, ammonia was converted to NHO and then to N 2 , and the selectivity was only 43.9 % (most became nitrate). Ammonia form was the critical factor influencing activity energy and conversion efficiency, and maintaining ammonia molecules by pH adjustment could reduce the energy barrier. The formation of the proposed intermediates, N 2 H 2 and N 2 H 4 , was corroborated by FTIR, Raman spectroscopy, and DFT calculations, which confirmed their role in the low-temperature pathway. These findings revealed a new pathway from ammonia to N 2 and provided a unique technical option to clean ammonia-containing wastewater.
研究领域:
环境工程
·
催化化学
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水污染控制
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环境材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Xiaojing Zhang,Yue Zhou,Boyang Yu,Nan Zhang,Lina Wang,Haoqiang Fu,Jie Zhang
Autotrophic nitrogen removal is an innovative and economical nitrogen removal technology, in which partial nitrification (PN) is the key component. It is necessary to clear the impact of CuO nanoparticles (CuO NPs) on PN process since the wide application increased their opportunity for entering into wastewater. In this study, the short-term and long-term effects of CuO NPs on ammonia removal, extracellular polymeric substance (EPS) production and microbial community were investigated. Results suggested that CuO NPs in 1 mg L −1 had slight effect on PN, while that in 3–10 mg L −1 enhanced ammonia oxidation in the short-term exposure. In the long-term exposure experiment, CuO NPs with low concentration (≤5 mg L −1 ) improved both the bioactivity and relative abundance of ammonia-oxidizing bacteria (AOB). The suppression threshold on PN process of CuO NPs in short-term exposure was 30 mg L − 1 , while that in long-term exposure decreased to 10 mg L − 1 due to the adsorption and accumulation of NPs. Nitrosomonas was the predominant AOB in PN reactors, it showed better tolerance to CuO NPs and performed the best performance when CuO NPs was 5 mg L −1 . Long-term exposure within CuO NPs led to organisms death and resulted in the decrease of EPS.
研究领域:
环境工程
·
废水处理
·
微生物学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiaojing Zhang,Zhao Chen,Nan Zhang,Yongpeng Ma,Yali Song,Yu Li,Hongzhong Zhang
Nanoparticles (NPs) and antibiotics are two emerging pollutants in environment and always simultaneously exist in nitrogen-rich wastewater. In this study, the individual and joint effects of CuO NPs and oxytetracycline (OTC) on partial nitrification (PN) process were investigated in four identical reactors (1 L). Results indicated that 1 mg L −1 CuO NPs and OTC respectively improved the ammonia removal efficiency (ARE) to 68.9% and 76.6%, compared to the 62.9% in control reactor. However, the joint CuO NPs and OTC performed significant suppression on PN and decreased the ARE to 51.0%, which was due to the formative complex of CuO NPs-OTC that disordered the metabolic and inhibited the cell growth. Nitrosomonas shared 38.01% (Control), 39.7% (CuO NPs), 44.29% (OTC) and 39.81% (CuO NPs + OTC), respectively. The joint CuO NPs and OTC induced 6.1 ( tetC ), 7.4 ( tetX ), 3.6 ( tetC ) and 2.9 ( tetM ) times’ amplification of antibiotic resistance genes compared with the blank.
研究领域:
环境科学
·
微生物学
·
污水处理
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Sitong Liu,Kun Feng,Dawei Zhang,Yang Liu,Jing Wang,Baiyun Lu,Defeng Xing
Understanding the stability and assemblage of biofilm microbiomes under oligotrophic conditions is critical for improving groundwater bioremediation. In this study, a novel microbial electrochemical filter (MEF) was developed to explore the impact of weak electrical stimulation on functional adaptability of biofilms under oligotrophic and 1,4-dioxane exposure conditions. Under 20 mg/L 1,4-dioxane stress, the MEF achieved 94.72 % manganese removal and 27.27 % ammonia nitrogen removal, while the conventional biofilter exhibited 88.76 % manganese removal with negligible ammonia nitrogen removal. Metagenomics analyses revealed that dominant populations in the MEF included Nitrospira , Bradyrhizobium , and Nitrosomonas , with relative abundance of 6.23 −10.78 %, 5.81 −6.15 %, and 1.62 −5.58 %, respectively. Weak electrical stimulation enriched the manganese oxidation-associated genes cotA , mnxG , and mcoA , whose total relative abundances being 6.3 times that of the conventional biofilter before dioxane exposure and 2.0 times after exposure. Genes encoding ammonia monooxygenase ( amoABC ), hydroxylamine dehydrogenase ( hao ) increased by 2.4- and 1.9-fold, respectively, compared to the conventional biofilter. Additionally, genes involved in the reductive tricarboxylic acid cycle and nitrogen fixation were twice as abundant in the MEF than in the conventional biofilter, suggesting enhanced nutrients availability for heterotrophic bacteria during start-up. These findings demonstrated that weak electrical stimulation effectively regulated biofilm microbiomes and enhance pollutant removal in MEF under oligotrophic conditions.
研究领域:
环境生物技术
·
微生物生态学
·
水处理技术
·
宏基因组学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Xiao Gu,Jiaying Wu,Dekai Liu,Chuxin Wang,Peiqin Chen,Chunying Jin,Guangya Zhang,Wei Jiang
The extensive use of fossil fuels has caused a sharp increase in atmospheric carbon dioxide (CO2) concentrations, and carbon capture, utilization, and storage (CCUS) methods are considered to be a promising approach. Enzymes have gained attention in the CCUS field due to their mild reaction conditions, high catalytic efficiency, and environmental friendliness. Among these, carbonic anhydrase (CA) effectively enhances the CO2 absorption efficiency. Building on CA’s role, the subsequent utilization of hydrated bicarbonate (HCO3–) is implemented to achieve CCUS objectives. Experiments identified a hyperthermophilic enzyme, Pyrococcus furiosus carbamate kinase (CK-Pf), which converts CO2 into value-added products through green processes while removing environmental pollutant ammonia. An in vitro multienzyme cascade pathway was designed: CA first hydrates CO2 to HCO3–, after which CK-Pf converts ammonia and HCO3– to carbamoyl phosphate (CP) via carbamate in an ATP-dependent manner. Aspartate transcarbamoylase (ATC) then converts CP to n-carbamoyl-l-aspartate (n-CP-l-Asp). A one-pot multienzyme system demonstrated high activity between 50 and 80 °C, achieving a CO2 conversion rate of 5.70%. This multienzyme cascade establishes a green CCUS route, offering a feasible technical solution for reducing NH3 and CO2 emissions while enabling resource utilization.
研究领域:
生物催化
·
环境生物技术
·
酶工程
·
碳捕集与利用
·
生化途径
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Jing Wang,Ling Li,Baihui Chi,Jiajia Shan,Xianliang Yi,Yang Liu,Hao Zhou
The use of disinfectants made from quaternary ammonium compounds (QACs) has greatly increased since the outbreak of SARS-CoV-2. However, the effect of QACs on wastewater treatment performance is still unclear. In this study, a commonly used QAC, i.e., benzyl dodecyl dimethyl ammonium bromide (BDAB), was added to a moving-bed biofilm reactor (MBBR) to investigate BDAB's effect on nutrient removal. When the BDAB concentration was increased to 50 mg L −1 , the ammonia removal efficiency (ARE) greatly decreased, as did the nitrate production rate constants (NPR). This inhibition was partly recovered by decreasing the BDAB concentration to 30 mg L −1 . Metagenomic sequencing revealed the functional genera present during different stages of the control (Rc) and BDAB-added reactors (Re). The enriched genera ( Rudaea , Nitrosospira , Sphingomonas , and Rhodanobacter ) in Rc mainly related to the nitrogen metabolism , while the enriched genera in Re was BDAB-concentration dependent. Functional genes analysis suggested that a lack of ammonia oxidase-encoding genes ( amo ABC) may have caused a decrease in ARE in Re, while the efflux pump-encoding genes emr E, mdf A, and opr M and a gene encoding BAC oxygenase ( oxy BAC) were responsible for BDAB resistance. The increase in the total abundance of antibiotic resistance genes (ARGs) in Re revealed a potential risk arising from BDAB. Overall, this study revealed the potential effect and ecological risks of BDAB introduction in WWTPs .
研究领域:
环境科学
·
微生物学
·
污水处理
·
宏基因组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）