REACTIVE & FUNCTIONAL POLYMERS
·
2016
·
IF 2.725
Luanluan Zhang,Hejun Gao,Yunwen Liao
A series of functional cross-linked polymer (Poly(AMPS- co -DVB)) were synthesized by 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and divinylbenzene (DVB). The physicochemical properties of the Poly(AMPS- co -DVB) were characterized by FT-IR, TGA , SEM, XRD , Zeta potential and UV–Vis. Those results showed that the Poly(AMPS- co -DVB) could provide mounts of adsorption sites from its special structure. The effects of the initial pH, dosage, contact time, and temperature on the adsorption of Rhodamine B (RhB) onto the Poly(AMPS- co -DVB) were investigated. It was found that the initial pH was an important factor for the molecules form of RhB and the surface formation of Poly(AMPS- co -DVB). With increasing of molar ratio of AMPS/DVB, the adsorption efficiency increased gradually. In the adsorption process , both physical and chemical mechanism is presence to adsorb RhB. The maximum adsorption capacity could get 407.9 mg/g within 2 h at room temperature .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Royal Society Open Science
·
2019
·Vol. 6
·期 12
·
IF 2.515
Yan Wang,Hui-qiang Li,Li-ming Ren
The electro-Fenton (EF) process was applied to treat mother liquor of gas field wastewater (ML-GFW). The Fe-Fe electrodes were used and H2O2 was added to the EF system. Effect of initial pH on chemical oxygen demand (COD) removal efficiency, specific electrical energy consumption (SEEC), specific electrode plate consumption (SEPC) and organic matter removal mechanism was investigated. The results showed that COD removal efficiency reached the maximum (71.9%) at initial pH of 3 after reaction for 3 h. Besides, considering with the SEEC and SEPC, pH of 3 was also the best choice, at which SEEC was 4.7 kW h kgCOD−1, SEPC was 0.82 kgFe kgCOD−1. Organic matter removal was achieved by two ways: oxidation and flocculation, and oxidation played a major role. With the analysis of GC-MS, the possible degradation pathways of the representative contaminants in the ML-GFW were given.
研究领域:
环境科学
·
废水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Qian Wang,Wen Luo,Ke Huang,Huan Li,Qiyong Xu
The poor biodegradability of humic acid (HA) in landfill leachate has posed significant challenges for effective leachate treatment. The ultraviolet light-activated peroxydisulfate (UV/PDS) system has shown potential in removing HA, with its performance being highly dependent on the initial pH values. However, the mechanisms by which initial pH influences HA degradation within UV/PDS systems remain unclear. This study investigated the effects and underlying mechanisms of different initial pH values (2, 4, 7, 9, 12) on HA degradation using the UV/PDS system. Results indicated that initial pH values of 4 and 12 were more conducive to the degradation of organic pollutants in HA solutions. In contrast, initial pH 4 was more favorable for organic matter degradation in leachate compared to initial pH 12. The removal rates of UV 254 and COD at initial pH 4 were 87.7 % and 90.0 %, respectively, while at initial pH 12, they were 69.2 % and 86.8 %. Both SO 4 -• and •OH were generated during the reaction, with SO 4 -• playing a predominant role in HA degradation. Moreover, the effect of initial pH on HA degradation was multifaceted. In early stages, it regulated the types of free radicals and reaction selectivity, thereby determining the formation of intermediate products. At pH 4 and 9, intermediate products were predominantly long-chain alkanes, whereas those at pH 12 were primarily amides and acid anhydrides. In later stages, dynamic pH changes led to the generation of stable small molecule carboxylic acids. This study provides insights into the application of UV/PDS systems for the HA treatment.
研究领域:
环境科学
·
水处理
·
化学工程
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Rui Li,Haoran Dong,Ran Tian,Jie Chen,Qianqian Xie
In this work, bare nanoscale zero-valent iron (NZVI) and the modified NZVI (sulfide-modified NZVI, Ni/NZVI and activated carbon supported NZVI) were utilized to activate sulfite for the removal of the target pollutant sulfamethazine (SMT). Some critical factors influencing the removal process were investigated, including dosage of sulfite and nanoparticles (NPs), ratios of modifier/NZVI, dissolved oxygen, initial pH values, groundwater components and aging time of NPs. Under the optimal conditions, in terms of the dosage of sulfite/NPs and the ratio of modifier/NZVI, all the modified NZVI showed a better performance than the bare NZVI. Dissolved oxygen was determined to be an essential factor for producing reactive radicals in all the activation processes. The active radicals were identified to be SO 4 · and HO·, and HO· was evidenced as the principal reactive species. Initial pH value significantly affected the SMT removal, which was obviously inhibited under alkaline condition. In such case, Ni/NZVI showed a better performance than the other NPs due to the catalysis effect of Ni. It was also found that the groundwater components (e.g., HCO 3 − , Ca 2+ , SO 4 2− , and humic acid) could restrain the removal process because of the buffering effect, the radical scavenging effect and some other effects (e.g., surface precipitation). Spectroscopic analysis of the fresh and aged (30 d) NPs illustrated that both bare and modified NZVI were slightly oxidized in the air, and could still be employed for the activation of sulfite.
研究领域:
环境科学
·
水处理
·
纳米技术
·
污染物去除
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 103
·84856-84864
·
IF 3.84
Qianchi Ma,Lei Liu,Wei Cui,Ruifeng Li,Tingting Song,Zhaojie Cui
Model aqueous solutions of perfluorooctanoic acid (PFOA, 100 mg L−1) were electro-oxidized in a homemade container. The electrocatalytic behavior and anodic performance of Ti/SnO2–Sb/Yb–PbO2, Ti/SnO2–Sb–PbO2 and Ti/SnO2–Sb–Yb anodes in sodium electrolytes were compared. The SnO2–Sb/Yb–PbO2 anode demonstrated better electrocatalytic performance compared with the SnO2–Sb–PbO2 and SnO2–Sb–Yb electrodes in terms of both degradation and defluorination. Then a systematic experimental study was designed as follows to analyze the influencing factors: initial concentration of PFOA (10 mg L−1 to 200 mg L−1), current density (1 mA cm−2 to 40 mA cm−2), initial pH value (3 to 11) and electrode distance (5 mm to 20 mm). After a 150 min electrolysis, the optimum reaction conditions were obtained and the degradation and defluorination ratios reached 95.11 ± 3.9% and 75.7 ± 2.8%, respectively. Under the optimum conditions, the degradation of PFOA followed pseudo-first-order kinetics (0.0193 min−1) and the degradation half-life was 35.9 min. The produced F− was measured using a fluoride ion selective electrode, whereas the intermediate PFCAs with short-chain lengths were measured using HPLC-MS. A detailed degradation pathway was proposed in this study by analyzing the intermediates and the recovery of fluoride.
研究领域:
环境科学
·
化学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Yongzhi Liu,Bin Si,Chun Zhao,Fan Jin,Huaili Zheng,Zhaoyang Wang
Cobalt ion is an environmental contaminant in general. But interestingly, it can also be used to degrade some refractory organic contaminants in water by mediated electrochemical oxidation process (MEOP) based on Co (III). MEOP is a very promising technology , and it can recycling use the mediator ions, Co (III), to degrade refractory organic contaminants in water. However, previous studies for this technology mainly conducted in strong acidic medium, the oxidation ability of this process for emerging contaminants near neutral pH condition was still unclear. Therefore, this study evaluated the emerging contaminants removal and mineralization efficiency of the MEOP-Co (III) around neutral pH, and investigated systematically the influence of series of operating parameters, including initial Co (II) concentration, current density, initial pH, electrolyte, and anions. Results from these studies indicated that the MEOP-Co (III) had a fairly good contaminants removal and mineralization ability for sulfamethoxazole, tetracycline , carbamazepine, diclofenac, and phenol at neutral pH. Besides, no radical was detected in MEOP-Co (III), and the main oxidizing substance was Co (III) ions, which was generated on anode surface. The addition of C O 3 2 − / H C O 3 − could weaken the oxidation ability of MEOP-Co (III), while C l − and P O 4 3 − could enhance the system's oxidation ability. Moreover, a reasonable energy consumption was achieved in MEOP-Co (III), and the highest electric energy per order (EE/O) value was 2.4 kWh·m −3 in this study.
研究领域:
环境科学
·
水处理
·
电化学
·
污染物降解
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Jianhui Xu,Pengxu Wang,Shenggui Chen,Lei Li,Dan Li,Yunfei Zhang,Qi Wu,Jinhong Fan,Luming Ma
Here, we report the production of 3D-printed MoS 2 /Ni electrodes (3D-MoS 2 /Ni) with long-term stability and excellent performance by the selective laser melting (SLM) technique. As a cathode, the obtained 3D-MoS 2 /Ni could maintain a degradation rate above 94.0% for florfenicol (FLO) when repeatedly used 50 times in water. We also found that the removal rate of FLO by 3D-MoS 2 /Ni was about 12 times higher than that of 3D-printed pure Ni (3D-Ni), attributed to the improved accessibility of H*. In addition, the electrochemical characterization results showed that the electrochemically active surface area of the 3D-MoS 2 /Ni electrode is about 3-fold higher than that of the 3D-Ni electrode while the electrical resistance is 4 times lower. Based on tert -butanol suppression, electron paramagnetic resonance and triple quadrupole mass spectrometer experiments, a “dual path” mechanism and possible degradation pathway for the dechlorination of FLO by 3D-MoS 2 /Ni were proposed. Furthermore, we also investigated the impacts of the cathode potential and the initial pH of the solution on the degradation of FLO. Overall, this study reveals that the SLM 3D printing technique is a promising approach for the rapid fabrication of high-stability metal electrodes, which could have broad application in the control of water contaminants in the environmental field.
研究领域:
环境科学
·
材料科学
·
电化学
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Mei Dong,Kuilong Liu,Guoqiang Song,Guiping Ma
In this study, MOF-on-MOF hybrids were successfully synthesized by interfacial growth method using CoZn-ZIF as guest MOF and MIL-101(Fe) as host MOF, and then employed as heterogeneous catalysts to activate peroxymonosulfate (PMS) in the degradation of dyes. The hybrids exhibited different morphologies depending on the Co/Zn ratios (10/0, 10/2, 10/10, and 2/10), all of which displayed exceptional catalytic performance. Notably, the hybrid with a Co/Zn ratio of 10/2 showed the highest degradation rate of MB, reaching 100 % removal within 3 min with a k obs value of 452.75 Lg −1 min −1 based on the pseudo-second-order kinetic model. Through EPR characterization and scavenging experiments, it was determined that the degradation of dyes occurred through a combination of radical (SO 4 •-, •OH)and non-radical ( 1 O 2 ) pathways, with 1 O 2 and SO 4 •- playing prominent roles. Various factors such as Co/Zn ratio, catalyst dosage, PMS concentration, initial pH, temperature, and MB solution concentration were systematically investigated to understand their influence on the catalytic performance. Furthermore, the influence of inorganic ions, humic acid (HA), and the reusability and stability of the catalyst was evaluated, demonstrating its potential for practical applications. Overall, this research provides valuable insights into the design and application of MOF-based catalysts for environmental remediation processes.
研究领域:
环境科学
·
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xiaoli Zhang,Penghui Shi,Wenbin Zhao,Wu Lu,Feng Li,Yulin Min,Qunjie Xu
Advanced oxidation processes (AOPs) focusing on non-thermal plasma induced by dielectric barrier discharge (DBD) are adequate sources of diverse reactive oxygen species beneficial for water and wastewater treatment. The degradation of methylene blue (MB) was investigated using plasma liquid dielectric barrier discharge with a multineedle-to-plane reactor. MB at 20 mg/L concentration was almost completely degraded after 40 min of treatment. In this study, several important parameters, such as input voltage, initial concentration, initial pH, discharge gap, tip radius of curvature, and presence of radical, were evaluated, and their effects on MB degradation rate were investigated. The degradation rate of MB increased with initial pH. By contrast, the degradation rate showed a downward trend with increasing initial concentration, discharge distance, and tip curvature radius. O 3 and H 2 O 2 produced during the degradation process considerably influenced the entire degradation process, especially when the quenching agents of HO ⋅ , O 2 · - and e − were added, and the degradation efficiency was obviously reduced. According to the measured spectrum, the possible process of the discharge process was analyzed, and the COMSOL finite element simulation is performed to obtain the visualization of the discharge model. This work can provide exploratory platforms for comprehensively understanding and enhancing MB degradation in DBD plasma technology.
研究领域:
环境科学
·
化学工程
·
等离子体物理
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Shicheng Yuan,Hui Hu,Hao Huang,Zhongming Chen,Jiaxin Chen,Mi Zhang,Kunpeng Li,Ting Zhou,Ruibin Lv
Chlorobenzene (CB) is an important organic chemical material that is volatile and difficult to degrade, and has received much attention because of its strong ozone generation potential. An electrochemical-sodium peroxydisulfate (PDS) system was constructed and the oxidation reaction path of chlorobenzene in this system was analyzed. The effects of current density, PDS concentration, initial pH, CB blow-off gas ratio and temperature on the oxidation and mineralization rate of chlorobenzene in the system were investigated respectively. At a current density of 168 A/m 2 , a PDS concentration of 0.5 mol/L, an initial pH of 10, a CB blow-off gas ratio of 20% and a reaction temperature of 60 °C, the CB conversion and mineralization rates were able to reach more than 90%. The results of electron paramagnetic resonance (EPR) experiments using 5,5-dimethyl-1-pyrroline N-oxide (DMPO) and 2,2,6,6-tetramethyl-4-piperidone hydrochloride (TEMP) as spin trapping agents indicate the presence of ⦁OH, · S O 4 − and 1 O 2 in the system. The signal of · O 2 − was also captured after the quenching of ⦁OH, which further indicates the presence of 1 O 2 . And the results of active substance quenching experiments showed that the active species that mainly contributed to the oxidation of chlorobenzene included ⦁OH, · S O 4 − and 1 O 2 , and their contributions to the oxidation of chlorobenzene were 25.0%, 31.7% and 22.2%, respectively. The Liquid Chromatograph Mass Spectrometer (LC-MS) characterization results showed that the formation of chlorophenol and hydroquinone and their ring-opening reactions were the most critical processes in the oxidative decomposition of chlorobenzene, and the reaction pathways for the oxidation of chlorobenzene by ⦁OH, · S O 4 − and 1 O 2 were proposed by these characterization results.
研究领域:
环境科学
·
化工工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）