PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Qing Shao,Yiyi Yi,Yuxiang Xie,Haike Yang,Jingyi Guo,Zizheng Liu,Yiqun Chen,Jun Wan
The utilization of steel slag as an adsorbent for wastewater treatment (e.g., phosphorus removal) is a promising direction for the simultaneous disposal of solid waste and eutrophication control. In this study, 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) was selected as a representative phosphonate and its adsorption performance and mechanism on steel slag were explored. The experiment results show that for the HEDP solution with a concentration of 0–50 mg/L, the removal efficiency of steel slag was 85–88% and the adsorption capacity was 0.0835–8.2793 mg-P/g. The HEDP adsorption behavior on steel slag conformed to the pseudo-second-order adsorption kinetics model. Both the Freundlich and Langmuir adsorption isotherm models can describe the experimental data well. And the theoretical maximum adsorption capacity at 25°C was calculated as 23.74 mg-P/g. Combined with our SEM, XRD, FTIR, and XPS analyses, the adsorption mechanism involved ligand exchange, hydrogen bond interaction, and electrostatic attraction. After 5 reuse cycles, the regeneration efficiency of steel slag remained 77% by using 1 mol/L NaOH. The research work in this paper proves that steel slag, as a solid waste with large emissions in China, can effectively remove HEDP, which supplies a new way for the resource utilization of steel slag.
研究领域:
环境科学
·
废水处理
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产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2018
·
IF 4.862
Shimin Pu,Meiyun Chen,Yingqi Chen,Wentai Zhang,Hanaa Soliman,Ai Qu,Qijun Liu,Xin Tang,Nan Huang,Guojiang Wan
In this study, a coating of ionic Zr integrated in 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) metalorganic-like complexes was applied on Mg for corrosion control. HEDP was first immobilized on alkaline pretreated Mg followed by an alternating dip-coating process of Zr ions and HEDP to build a complex coating on Mg. This coating was demonstrated to be homogeneous, compact and with a metalorganic-like framework firmly anchored on Mg. This coating led to reduced corrosion current densities and remarkably suppressed long-term in vitro degradation of Mg in phosphate buffer saline (PBS). This complex coating showed promise for surface modification of Mg in biodegradable applications.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2024
·
IF 2.2
Liping Wei,Kexin Zhou,Hui-qiang Li,Ping Yang,Baicang Liu
Most of the materials studied as catalysts in the electro-Fenton system are variants of iron oxide or iron hydroxide. However, iron-based catalysts often exhibit weak catalytic capabilities under neutral and alkaline conditions. In this work, we synthesized three cobalt based bimetallic oxides, Co2CuOx, Co2AlOx, and Co2NiOx, using hydrothermal method and evaluated them as catalysts for the heterogeneous electro-Fenton system to remove 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) and Methylisothiazolinone [2-methyl-4-isothiazolin-3-one] (MIT). Co2NiOx has the highest catalytic degradation activity for HEDP, and Co2CuOx has the best catalytic degradation effect for MIT. Based on characterization results of the catalysts, the reasons for the differences in the pollutant removal efficiency were analysed, and the optimal pH for the three cobalt based oxides to remove HEDP and MIT was investigated. The results showed that the optimal pH values of the three cobalt based bimetallic oxides are not only influenced by the second metal type, but also by the properties of pollutants. Therefore, suitable cobalt based catalysts can be selected based on the different properties of pollutants, or the composition of cobalt based catalysts can be adjusted to meet the different pH requirements of target wastewater. The three cobalt based bimetallic oxides exhibited good degradation of HEDP and MIT under neutral conditions, which to some extent solved the problem of narrow pH range in the practical application of the electro-Fenton process.
研究领域:
环境科学
·
催化材料
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产品关联
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Qing Shao,Yiyi Yi,Yuxiang Xie,Jingyi Guo,Haike Yang,Yiqun Chen,Jian Shi,Zizheng Liu
Three zirconium-loaded zeolite (Zr-Z) composites—namely, Zr 4+ -Z, ZrO 2 -Z, and ZrMo 2 O 8 -Z—were prepared by co-precipitation of Zr 4+ , ZrO 2 , and ZrMo 2 O 8 , respectively, with artificial zeolite, and these composites were used for the efficient removal of a representative phosphonate, i.e., 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP). The adsorption efficiency of the three composites for HEDP at an initial concentration of 2 mg/L was more than double that of artificial zeolite. Pseudo-second-order kinetics could fit the adsorption process of the three composites well. The heterogeneous adsorption by Zr 4+ -Z, ZrO 2 -Z, and ZrMo 2 O 8 -Z was determined by using the Sips model. And the theoretical maximum HEDP-adsorption capacities of Zr 4+ -Z, ZrO 2 -Z and ZrMo 2 O 8 -Z were 3.52 mg P/g, 3.38 mg P/g and 3.77 mg P/g, respectively, at 308 K. At pH 4–9, the three Zr-Z composites could achieve efficient and stable HEDP adsorption. Among Co-existing ions (Cl − , HCO 3 − , NO 3 − , SO 4 2− , Ca 2+ , Mg 2+ ), 50 mM HCO 3 − hindered adsorption due to its competition with HEDP. The characterization results show that the adsorption mechanism involved hydrogen bonds, electrostatic attraction, and ligand exchange. In addition, the reusability and column adsorption performance of the Zr-Z composites were explored for the efficient removal of the organic phosphonate HEDP from wastewater in practical applications.
研究领域:
环境科学
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材料科学
·
化学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 18
·15247-15259
·
IF 3.289
Meiyun Chen,Yingqi Chen,Wentai Zhang,Sheng Zhao,Juan Wang,Jinlong Mao,Wei Li,Yuancong Zhao,Nan Huang,Guojiang Wan
An ultrathin bisphosphonate film, 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), was deposited on magnesium for biodegradable implant applications. The small, bioactive HEDP molecule is supposed to be not only bio-safe, but also favorable for creating a highly protective layer for the control of the corrosion/degradation of Mg. In an in situ chemical sequence, the HEDP molecules were covalently surface-immobilized on the alkaline pretreated Mg and then spontaneously deposited by participation in a chelating reaction with Mg ions. An organometallic-like compound layer was thus formed, which was ascertained to be within the nanoscale and complied well with the substrate. The tape test showed that the HEDP film provides excellent adhesion strength. Electrochemical corrosion and in vitro immersion degradation investigations demonstrated that the HEDP coated Mg exhibited significantly slower corrosion rate than untreated Mg in phosphate buffered saline (PBS) solution. Of particular significance is the observation that HEDP coated Mg presented a remarkably suppressed localized corrosion mode. The meliorated corrosion/degradation behavior is credited to both the nature of the organometallic-like HEDP derivative layer, as well as the high quality of the film, with respect to compactness and homogeneity. Our HEDP modified Mg may bode well for application in biodegradable implants.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Ruiyuan Jia,Xiaomeng Yu,Wenhui Wang,Kemeng Du,Yuru Liu,Yufei Wang,Wenjun Wu,Jin Guo
A lanthanum-modified polyethersulfone composite membrane (La-PES) loaded with nitrogen-doped carbon nanotubes (NCNT@La-PES) was successfully fabricated in this study. The NCNT@La-PES membrane could activate PMS, which enabled the degradation of phosphonate to phosphate, while also possessing the capability for adsorptive recycling of phosphorus. During the processing of 10.31 mg/L 1-hydroxyethane-1,1-diphosphonic acid (HEDP) in the NCNT@La-PES / PMS system, the removal efficiency of HEDP achieved 100 %, and almost 78 % of total phosphate (TP) in HEDP was transformed into phosphate, which were further adsorptive recycled by the La-PES membrane. The NCNT@La-PES/PMS system demonstrated exceptional performance across a broad pH range (4–10), with complete removal of HEDP and adsorption recovery of 73 % transformed phosphate. The decrease in pH caused by catalytic reaction reduced the hindrance of the alkaline environment to phosphate adsorption. The NCNT, acting as a catalyst, facilitated the formation of surface-bound radicals upon PMS activation, playing a pivotal role in the degradation of HEDP. The adsorption of phosphate by La-PES was primarily attributed to the ligand exchange between La(OH) 3 and phosphate. Moreover, NCNT@La-PES/PMS system showed significant catalytic and adsorption performance in consecutive cyclic treatment of HEDP in actual water, indicating its potential in practical application.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Hui-qiang Li,Mei-yu Zhang,Ke-xin Zhou,Ping Yang,Zhi-wei Gan,Zhi Li
s Iron-based catalysts are widely used in the electro-Fenton technology, which are limited by strict acidic conditions. Cobalt-based catalysts can undergo Fenton-like reactions with H 2 O 2 under neutral conditions. In this study, a CF@Co 2 NiO x @MgAl-LDH cobalt-based bimetallic catalyst was prepared to study 1-hydroxyethylidene-1 (HEDP) and methylisothiazolinone (MIT) degradation performance in a heterogeneous electro-Fenton system. Cobalt-based bimetallic oxides were first modified with magnesium-aluminum hydrotalcite (MgAl-LDH) and subsequently loaded onto carbon felts (CF) to reduce metal ion leaching and improve catalyst recyclability. The experimental results showed that CF@Co 2 NiO x @MgAl-LDH could effectively remove 93.06% of HEDP and 92.42% of MIT after 2 hours of reaction. Removal of HEDP and MIT was still achieved at 78.62% and 81.09% after four cycles of experiments. Based on the catalyst characterization results, the reasons for the differences in the pollutant removal performance were analyzed and the optimal operating parameters of the CF@Co 2 NiO x @MgAl-LDH for the removal of HEDP and MIT were investigated. This study provides a novel and sustainable strategy for the design and application of cobalt-based catalysts.
研究领域:
环境化学
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催化科学
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水污染控制
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材料化学
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环境工程
·
应用电化学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Hang Zhang,Miaomiao Hu,Yun Cheng,Xiaohua Li,Xinyang Zhang,Yujie Ying,Jie Cao,Xiujian Xia,Shusen Zhang,Zhanfu Wei,Jintang Guo
This work proposed an ultra-high temperature set-regulation method to provide a reference scheme for the optimal retarder design of ultra-deep formation oil well cementing slurry. It was found that there was a synergistic retarding effect between 2-acrylamido-2-methylpropanesulfonic acid-based copolymer retarder and 1-hydroxyethylidene-1,1-diphosphonic acid, and the latter could serve as an intensifier for the former to significantly prolong the ultra-high temperature (≥200 ℃) thickening time of cement slurry. The thickening progress mechanism of cement slurry was studied from the perspective of hydration kinetics and mineral content evolution. Results indicated that the content of cement hydration products during the thickening process did not increase gradually and linearly, but increased rapidly within several minutes near thickening time due to the acceleration of hydration. The introduction of intensifier 1-hydroxyethylidene-1,1-diphosphonic acid extended the thickening time by highly delaying the hydration of silicate minerals (C 3 S/C 2 S), while less affected the hydration of aluminate minerals (C 4 AF/C 3 A). Furthermore, the synergistic principle between copolymer retarder and 1-hydroxyethylidene-1,1-diphosphonic acid was proposed from microchemical perspective. Analysis showed that the PO 3 2- was a stronger anchoring group than -COO - and could compensate for the decline of Ca 2+ chelating ability of copolymer retarder caused by decarboxylation and thermal oxidative degradation in ultra-high temperature and alkaline environment, thus further delaying the hydration.
研究领域:
石油工程
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材料科学
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DOI
高影响因子
Minerals
·
2022
·Vol. 12
·期 12
·1633
·
IF 2.818
Jingkun Zhang,Zhiyun Xiao,Hongbo Zhang
In the reverse flotation of fluorapatite and dolomite, high-efficiency depressors of fluorapatite have received considerable attention. In this paper, the depression mechanism of hydroxy ethylene diphosphonic acid (HEDP) was studied for the first time as a novel fluorapatite depressant on the surface of fluorapatite. The effect of HEDP on the flotation behavior of the two minerals was studied by single and mixed minerals in flotation tests. HEDP exhibited an excellent depression effect on fluorapatite flotation, whereas its adsorption on dolomite surface was minimal. Fluorapatite and dolomite were effectively separated by applying sodium oleate as a collector and HEDP as a depressant at pH 6.0. The depression mechanism of HEDP on fluorapatite was further analyzed via contact angle measurement, zeta potential and X-ray photoelectron spectroscopic (XPS) analysis. We found that HEDP seriously hindered the adsorption of sodium oleate (NaOL) on the fluorapatite surface and had a minimal effect on the dolomite surface. XPS analysis results indicate that the strong adsorption of HEDP on the fluorapatite surface can be attributed to the strong chelation between the electron-rich groups of HEDP and Ca ions on the fluorapatite surface. Therefore, HEDP is used as a selective depressant of fluorapatite in the fluorapatite–dolomite flotation–separation process.Keywords:HEDP;fluorapatite;flotation;depression mechanism
研究领域:
矿物加工工程
·
化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Jianjun Wang,Wenheng Li,Zihan Zhou,Zhiyong Gao,Yuehua Hu,Wei Sun
Fluorite is usually separated from calcite by froth flotation method using large amounts of sodium silicate depressant, which can cause trouble in the loss of fluorite and wastewater treatment. In this study, green and low-cost 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP or H 4 L) was used as pH-dependent switch to initially depress fluorite for calcite pre-removal at pH 6.0, and then activate fluorite for further upgrading fluorite concentrate at pH 8.0. The depressing behavior and mechanism were reported in this work. H 2 L 2− was the dominant form of HEDP, and a stronger chemical adsorption of H 2 L 2− on fluorite hindered the subsequent adsorption of sodium oleate (NaOL), while that of the calcite showed the opposite result. Two active O atoms in H 2 L 2− could well match in interatom distance with two Ca sites on fluorite to form Ca-H 2 L complexes. The pH-dependent switch reagent reported here may open a new avenue for more selective separation among mixed mineral systems.
研究领域:
矿物加工工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2023
·
IF 4.8
Jiahui Wu,Longhua Xu,Donghui Wang,Kai Xue,Xinzhang Shi,Lin Peng,Jiushuai Deng
Removing calcite is a tricky problem in smithsonite flotation because of its better floatability. 1-Hydroxyethylidene-1,1-diphosphonic acid (HEDP), a scale inhibitor in water treatment industry, was chosen as a calcite depressant. This study validated the effectiveness of HEDP in separating smithsonite from calcite by flotation using sodium oleate (NaOL) as the collector, and obtained a 70% recovery difference in a single mineral flotation. Artificial mixed mineral flotation obtained a concentrate with a grade of 44% and a recovery of more than 80%. Zeta potential, Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) tests were conducted to obtained some crucial information on the adsorption of NaOL and HEDP, demonstrating that the adsorption of HEDP on calcite surfaces was stronger than smithsonite. The intense adsorption of HEDP on calcite surfaces was attributed to chelation with surface calcium sites. Quantum chemical calculations suggested that the selectivity of HEDP was closely related to the phosphate groups. HEDP was chemically adsorbed on calcite surface by complexing with calcium sites to form six-membered ring chelate. Partial oxygen atoms of phosphate groups dominated in the reaction with calcium sites, and the deprotonation of phosphate groups enhanced the reactivity.
研究领域:
矿物加工工程
·
表面化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Bin Yang,Donghui Wang,Shaohang Cao,Wanzhong Yin,Jiwei Xue,Zhanglei Zhu,Yafeng Fu,Jin Yao
This research focused on the adsorption features and depression mechanism of 1-hydroxyethylene-1,1-diphosphonic acid (HEDP) used as a novel dolomite depressant on dolomite and magnesite surfaces, to extend the application of HEDP for the selective flotation of magnesite from dolomite. The depression impacts of HEDP on the flotation behaviors of the two minerals were investigated through micro-flotation tests. The flotation results indicated that, when sodium oleate (NaOl) was used as the collector, HEDP displayed an outstanding depression effect on the dolomite flotation, whereas it had only a slight influence on the magnesite flotation. Dolomite and magnesite could be efficiently separated at approximately pH 10 with a reagent scheme of 200 mg/L HEDP and 120 mg/L NaOl. The selective depression mechanism of HEDP for dolomite was revealed using contact angle, X-ray photoelectron spectroscopy (XPS), zeta potential, and infrared spectrum (IR) analyses. The results from the contact angle tests indicated that HEDP selectively reduced the surface hydrophobicity of dolomite in the NaOl system. Besides, zeta-potential measurements and IR analyses revealed that the addition of HEDP prior to NaOl had no significant impact on the adsorption of NaOl onto magnesite; however, this addition strongly prevented NaOl from being adsorbed onto dolomite, resulting in a significant difference in the flotation performances of the two minerals. Furthermore, crystal chemistry calculations and XPS analyses confirmed that the strong adsorption of HEDP on the dolomite surface could be attributed to the interaction between the HEDP electron-rich groups and the calcium species exposed to dolomite. Thus, HEDP could be used as a high-performance depressant for the dolomite flotation to realize the decalcification of the magnesite flotation.
研究领域:
矿物加工工程
·
表面化学
✓ 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）