WATER RESEARCH
·
2019
·
IF 7.913
Dongni Sun,Xiaoting Hong,Keming Wu,K.S. Hui,Yingying Du,K.N. Hui
Electro-oxidation using RuO 2 –IrO 2 /Ti plate anode and electrocoagulation using iron plate anode were widely applied to remove ammonia and phosphate in an aquatic environment, respectively. In this work, we designed magnetically bound ZVI microparticles on RuO 2 –IrO 2 /Ti plate as a composite electrode for the simultaneous removal of ammonia and phosphate from aqueous solution via combined EO and EC (EO/EC) processes. We present a series of experiments to study such simultaneous removal under an electric field via the EO/EC process. In the electrochemical unit, mZVI-RuO 2 -IrO 2 /Ti, mZVI-graphite, and RuO 2 –IrO 2 /Ti electrodes were used as anodes. The influence of applied voltage, initial pH, zero-valent iron dosage, reaction temperature, and organic compounds on the EO/EC process was also examined. Ammonia and phosphate could be completely removed at an applied voltage of 10 V, pH of 7, zero-valent iron dosage of 0.1 g, and reaction temperature of 35 °C using mZVI-RuO 2 -IrO 2 /Ti anode when influent ammonia and phosphate concentrations is 200 and 100 mg L −1 . Ammonia degradation was consistent with pseudo-zero-order kinetic model. The characterization was analyzed by scanning electron microscope-energy dispersive spectrometer (SEM-EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Hence, the mZVI-RuO 2 -IrO 2 /Ti electrode can be used for efficient simultaneous removal of ammonia and phosphate.
研究领域:
环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Qingjun Zeng,Yifan Zhang,Pingshan Chen,Yuting He,Congli Yi,Chunhua Feng
In situ and simultaneous remediation of a variety of pollutants in sediments remains a challenge. In this study, we report that the combination of electrocoagulation (EC) and electrooxidation (EO) is efficient in the immobilization of phosphorus and heavy metals and in the oxidation of ammonium and toxic organic matter. The integrated mixed metal oxide (MMO)/Fe anode system allowed the facile removal of ammonium and phosphorus in the overlying water (99% of 10 mg/L NH 4 + -N and 95% of 10 mg/L P disappeared in 15 and 30 min, respectively). Compared with the controls of the single Fe anode and single MMO anode systems, the dual MMO/Fe anode system significantly improved the removal of phenanthrene and promoted the transition of Pb and Cu from the mobile species to the immobile species. The concentrations of Pb and Cu in the toxicity characteristic leaching procedure extracts were reduced by 99% and 97% after an 8 hr operation. Further tests with four real polluted samples indicated that substantial proportions of acid-soluble fraction Pb and Cu were reduced (30%–31% for Pb and 16%–23% for Cu), and the amounts of total organic carbon and NH 4 + -N decreased by 56%–71% and 32%–63%, respectively. It was proposed that the in situ electrogenerated Fe(II) at the Fe anode and the active oxygen/chlorine species at the MMO anode are conducive to outstanding performance in the co-treatment of multiple pollutants. The results suggest that the EC/EO method is a powerful technology for the in situ remediation of sediments contaminated with different pollutants.
研究领域:
环境科学
·
污染治理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Ying Zhang,Xule Chen,Miao Dong,Meiyan Li,Chengwen Wang,Yanzong Zhang
During the process of oilfield wastewater reuse, residual Boron in fracturing flowback fluid will lead to premature crosslinking with gelling agents, resulting in excessive viscosity at the front end of the fracturing fluid configuration. This phenomenon has heavily influenced the reuse of wastewater. Electrocoagulation (EC), as an effective approach to decreasing Boron concentration, has been widely studied, while further research of Boron removal from complicated wastewater is required to optimize. EC parameters were investigated to explore the optimal Boron removal effect of Fe, Al and Fe-Al three combined anodes. Under 46.3–57.2 mA/cm 2 , 90 min and pH of 9, Fe-Al anodes exhibit the best effect of Boron removal (84% ± 1.5%). Furthermore, high adaptive capacity of low current density and suitable pH confirm the best choice of Fe-Al combined anodes. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) demonstrate the complexation between Boron and metallic oxide. Finally, the common removal of various pollutants including Ca, Cl, K and Na further conduces to the reuse of oil wastewater.
研究领域:
环境科学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Ping Zhang,Feiping Zhao,Penggang Li,Junhao Zheng,Weichun Yang,Qingzhu Li,Zhihui Yang
Electrocoagulation (EC) is a facile technique for removing arsenic (As) pollutants from different water matrices with high efficiency. In this work, a novel strategy of Mn-assisted Fe EC was developed to further enhance the removal efficiency of arsenite [As(III)] from wastewater. When 1 mM of MnCl 2 was added to an Fe-EC system, the As removal efficiency reached 99.99%, and the residual concentration was only 9 μg/L, which is lower than the World Health Organization’s limit for drinking water . The characteristics of the generated flocs by four different EC processes in Fe, Fe-Mn, Fe-As, and Fe-Mn-As systems were investigated. The results showed that Mn 2+ promoted the formation of FeOOH, FeO x , MnO x , FeHAsO 4 , and MnHAsO 4 through low crystallinity and a high surface area . Density functional theory simulation and crystal orbital hamiltonian population confirmed that the generated Fe-Mn flocs had a greater adsorption affinity for As(III) and arsenate [As(V)]. The possible reactions in the EC processes and reaction mechanisms were also hypothesised. The current work provides meaningful insights into understanding the mechanisms of Mn-assisted Fe-EC systems, and further confirms its potential for practical applications in As pollution treatment.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
Emerging Contaminants
·
2016
·
IF 0
Bo Yang,Yanni Han,Yunpan Deng,Yingying Li,Qiongfang Zhuo,Jinhua Wu
Electrocoagulation (EC) technique was used to investigate the removal performance of aqueous perfluorooctanoic acid (PFOA) with relatively high concentration as simulating the wastewater from organic fluorine industry. A comparison was done with the similar amount of coagulant between EC and chemical coagulation process. PFOA removal obtained was higher with EC process, especially for Fe anode. Several factors were studied to optimize the EC process. At the optimal operating parameters including 37.5 mA/cm 2 of current density, initial pH 3.77, and 180 rpm of mixing speed, 93% of PFOA could be removed with 100 mg/L of initial concentration after 90-min electrolysis. Furthermore, the remove efficiency could be obviously improved by H 2 O 2 intermittent addition, which removed more than 99% of PFOA within 40-min EC. It could be attributed to that H 2 O 2 facilitated the oxidative transformation from ferrous to ferric ion. In addition, the adsorptive removal of aqueous PFOA on Fe flocs during EC was also verified by fourier transform infrared spectra.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
MINERALS ENGINEERING
·
2023
·
IF 4.8
Gaogui Jing,Xiangsong Meng,Jing Chen,Wei Sun,Przemyslaw Boguslaw Kowalczuk,Zhiyong Gao
Efficient treatment and purification of mineral processing wastewater (MPW) have not been sufficiently investigated in the past though they are of great importance for sustainable mineral processing. Herein, a unique electrocoagulation (EC) reactor with aluminium scraps as anode material was developed for the treatment of real industrial MPW containing residual flotation reagents (major contributor to chemical oxygen demand, COD) and suspended particles. It was found that the active coagulants produced from the dissolution of aluminium scraps can play a key role in the purification of MPW. Under the conditions of initial pH 9, current 1 A, and processing time 90 min, the removal rate of COD was 74% while the turbidity can be almost completely removed. The mechanism lies in that most of the flotation reagents was adsorbed on the surfaces of suspended mineral particles, namely, montmorillonite, quartz, garnet, chlorite and mica, and then precipitated with the mineral particles. This innovative technology of utilizing wasted aluminium scraps to treat MPW is in line with the green development.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Ruonan Zhang,Yanchao Xu,Liguo Shen,Renjie Li,Hongjun Lin
Efficient separation of oil-in-water emulsion remains a decisive step for success of oily wastewater treatment . To achieve this goal, a novel strategy regarding combining membrane separation with in situ electrocoagulation based on sacrificial anodes and cathodic hydrogen evolution via conductive metalized fabric membrane was proposed. As a key component of this novel coupling system, nickel functionalized fabric membrane with high hydrophilicity and electrical conductivity (electrical resistance of ∼2 Ω cm −1 ) was successfully prepared via a low-cost and facile route, including steps of PVA (polyvinyl alcohol)/Ni coating and autocatalytic electroless Ni plating. The optimized conductive membranes exhibited high permeate flux (19.3 × 10 5 L m −2 h −1 ·bar −1 ), separation efficiencies (99.5%), and separation stability to separate oil/water mixtures during the gravity-driven filtration process. To achieve the ideal performance to separate oil-in-water emulsion, a coupled electrocoagulation-membrane separation system was constructed with Ni@PVA membrane and Al mesh as the cathode and anode, respectively. It was shown that the coupled electrocoagulation-membrane separation system could achieve 99.4% rejection with high flux of 12.0 × 10 3 L m −2 h −1 ·bar −1 for oil/water emulsion separation, under the current density of 8 mA cm −2 and 20 min electrolysis time. This study revealed that the proposed electrocoagulation-membrane separation system based on Ni@PVA membrane is a promising technique in oil/water separation.
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
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Shiwei Xie,Chang Li,Hui Zhan,Wei Shao,Yuanxin Zhao,Peng Liu,Peng Liao
Fe-based replacement and precipitation are promising methods for removal of copper ethylenediaminetetraacetic acid (Cu(II)-EDTA) but are limited by the necessity of controlling pH and dissolved oxygen. The details of the decomplexation mechanism also remain unclear. The present work investigated an anoxic iron electrocoagulation process capable of automatically modulating anoxic conditions and solution pH during exposure to air and thus promoting the rapid and thorough decomplexation of Cu(II)-EDTA. Dissolved Fe (II), rather than Fe(II)-bearing minerals, was found to be primarily responsible for the reduction of Cu(II)-EDTA to Cu(I)-EDTA and for the subsequent replacement reaction to generate free Cu(I) ions within the initial pH range of 2–7. The Cu(I) was primarily precipitated as Cu 2 O on the surface of green rust and magnetite as the pH was increased. The aeration of these Fe-containing precipitates released free Cu(I) ions instead of chelated Cu into solution, allowing for recycling of the Cu. This release of Cu(I) was likely induced by the pH decrease during aeration. This study provides important insights regarding the reductive decomplexation of chelated Cu(II) and the recovery of Cu via anoxic iron electrocoagulation, which is a promising green approach to recycling Cu from wastewater.
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
Scientific Reports
·
2025
·Vol. 15
·期 1
·1-11
·
IF 3.9
Lu Pengpeng,Xu Jingyang,Liu Shuyan,Fu Lili,Wu Shengxian,Liu Ze,Hou Tu,Liu He,Huang Dongyan
The application of flexible hydrogel sensors in extreme environments, such as low temperatures, underwater, or significant mechanical deformations, poses considerable challenges. Here, we present a simple one-pot method to fabricate ultra-tough, swelling- and freezing-resistant conductive organohydrogels without external conductive and freeze-resistant fillers. During gelation, by-products (C 6 H 15 NHCl, KCl) provide both conductivity and antifreeze properties, thus eliminating compatibility issues and dispersion challenges associated with external fillers. The resulting gel exhibits super toughness, with tensile strength reaching 10.2 MPa and stretchability up to 800% in the dry state. Following covalent crosslinking, the gel demonstrates excellent anti-swelling properties, with a swelling ratio of only 15.4% after 24 h of water immersion, while maintaining a tensile strength of 5.8 MPa and an elongation of up to 1000%. When fabricated into flexible sensors, these gels display stable electrical responsiveness and desired Gauge Factor (0.58–2.25), effectively detecting limb movements. Furthermore, the gel’s superior resistance to freezing and swelling ensures reliable signal stability under both − 20 °C and underwater conditions. These combined properties render the conductive gel a promising candidate for flexible sensing components in robotic and bionic applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yong-Ke Li,Wang-Ting Lu,Ying-Xia Du,Rui Liu,Yu-Ting Yue,Yi-Lin Fan,Geng Zhang,Fei-Fei Cao
The hydrogen evolution reaction (HER) is the cathodic reaction of water electrolysis and electrocoagulation. The development of precious metal-free HER catalyst with high performance is important to decrease the energy consumption and capital cost. Due to the adjustable electronic structure and composition, intermetallic compounds are promising candidates to act as efficient HER catalysts. Herein, Co 3 W intermetallic compound is synthesized by reducing CoWO 4 with H 2 , during which CoWO 4 is transformed into a composite in the form of Co 3 W interconnected with W. The Co 3 W/W composite requires a low overpotential of 78 mV to reach the current density of 10 mA cm −2 in 1 M KOH. Moreover, the electrocoagulation device assembled by Co 3 W/W composite and iron plate only needs 0.2 V to initiate H 2 production in 0.5 M Na 2 SO 4 ; meanwhile, high removal ability for multiple water pollutants is also achieved. As the active species, Co 3 W presents low water dissociation energy barrier and proper adsorption strength of hydrogen atom, both of which are beneficial to HER kinetics. This work demonstrates a promising HER electrocatalyst that can be applied in non-acidic media for water splitting and electrocoagulation.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Bo Yang,Yanni Han,Gang Yu,Qiongfang Zhuo,Shubo Deng,Jinhua Wu,Peixin Zhang
Electrocoagulation (EC) technique was used to investigate the removal performance of aqueous perfluoroalkyl acids (PFAAs) with relatively high concentration as simulating the wastewater from organic fluorine industry. A comparison between iron and aluminum electrode was made to remove PFAAs with the similar electrolysis condition. Effective removal of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) was obtained by EC process, especially for Fe anode. Several key factors were studied to optimize the EC process using Fe electrode. At the optimal operating parameters including 25.0 mA/cm 2 of current density, 180 rpm of stirring speed, and 2 g/L NaCl as supporting electrolyte, more than 99% of PFOS could be removed with 0.25 mM of initial concentration after 50-min electrolysis. Additionally, the adsorptive removal of aqueous PFOS on iron hydroxide flocs during EC was also verified by Fourier transform infrared spectra. The investigation of removal efficiency for PFAAs with different carbon chain length after EC and the characteristic of zeta potential on Fe flocs indicated that the electrostatic adsorption was primarily responsible for the PFAAs sorption on the iron hydroxide flocs.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Bin Liu,Xinyue Cui,Xiaozhen Lu,Xuewu Zhu,Lin Wang,Junyong Zhu
Positively charged polyamide (PA) nanofiltration (NF) membranes with sub-nanopores show promise for lithium extraction from salt-lake brines with high Mg 2+ /Li + ratios. This study introduces the use of triamino guanidine (TG), a highly positively charged molecule, to regulate grafting on monolayer PA membranes, resulting in dual-layer (PEI-TMC-TG) NF membranes. The monolayer PA membranes were created via spin-coating assisted interfacial polymerization between polyethyleneimine (PEI) and tricarbonyl chloride (TMC). The PEI/TMC-TG NF membranes exhibited several advantages over unmodified PEI-TMC NF membranes, including higher positive charge density, narrower pore size distribution, excellent hydrophilicity, and a more porous separation layer microstructure. Experimental results indicated that enhanced Donnan effect, size sieving, and dielectric repulsion within the sub-nanopores contributed to exceptional Li + /Mg 2+ selectivity during filtration of East Taijiner brine (S Li + /Mg 2+ = 64.5). Furthermore, the TG hydrophilic layer significantly improved water permeability (15.4 LMH/bar) and long-term stability. To reduce membrane fouling in the charge-positive NF process by removing organic matter from complex salt lake brine, we explored electrocoagulation as a pre-treatment method and identified optimal conditions for the EC-NF process. This strategy maximizes sustainable lithium recovery from brine in an economically viable green manner while enhancing the efficiency of NF membranes for lithium extraction from salt lakes.
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
危险品化学品经营许可证（带存储）