Coatings
·
2022
·Vol. 12
·期 7
·885
·
IF 3.236
Deling Yuan,Zhihui Zhai,Eryu Zhu,Huilin Liu,Tifeng Jiao,Shoufeng Tang
Humic acid (HA) has complex molecular structure and is capable of adsorption, ion exchange, and chelation with organic and inorganic pollutants in water bodies, worsening water quality and jeopardizing human health and ecological environment. How to effectively remove HA from water is one of the research focuses of this paper. In this study, the UV-activated sodium perborate (SPB) synergistic system (UV/SPB) was established to eliminate HA in water. The effects of initial HA concentration, SPB dose, and initial pH value on the HA elimination were determined, and the main mechanisms of the synergy and HA degradation were explored. The outcomes show that the HA elimination ratio by the sole UV and only SPB system were only 0.5% and 1.5%, respectively. The HA removal of UV/SPB reached 88.8%, which can remove HA more effectively than other systems. Free radical masking experiment proved that hydroxyl radical produced by SPB activation is the main active substance for HA removal. The results of UV-vis absorption spectrum, absorbance ratio, specific UV absorbance, and excitation–emission matrix spectroscopy verified that the UV/SPB system can effectively decompose and mineralize HA.
研究领域:
环境科学
·
水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Lan Yang,Xiuxiu Yang,Dan Li,Liwei Zhuang,Lingzong Meng,Tianlong Deng,Yafei Guo
The solubilities and refractive indices in the systems Na 2 SO 4 –NaBO 2 –H 2 O and NaCl–Na 2 SO 4 –NaBO 2 –H 2 O at 323.15 K were studied by the isothermal dissolution method. The phase diagram of the ternary system is composed of two single-salt crystallizations for Na 2 SO 4 and NaBO 2 ·4H 2 O. A comparison of the diagrams of system Na 2 SO 4 –NaBO 2 –H 2 O from 288.15 K to 323.15 K shows that the crystallization region of NaBO 2 ·4H 2 O changes greatly as the temperature increasing, and the solid phase of mirabilite at 288.15 K and 298.15 K transforms into the nardite at 308.15 K and 323.15 K. The dry-salt diagram of the quaternary system consists of four salt crystallization fields for NaCl , NaBO 2 ·4H 2 O, NaCl·NaBO 2 ·2H 2 O and Na 2 SO 4 , five univariant solubility curves and two invariant points. On the basis of the Pitzer model, the lacking Pitzer parameters and dissolution equilibrium constants of the solid phases in this quaternary system were fitted with the solubilities and other thermodynamic properties in this study and literature. The calculated solubilities in the two systems are in good agreement with the experimental data.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Yafei Zhen,Tao Lin,Hanjiao Chen,Jing Hu,Xiandeng Hou
This technical note reports for the first time the simultaneous vapor generation of 16 rare-earth elements (REEs) via reaction with sodium tetrahydroborate (THB). Significant improvement in REE vapor generation efficiency was discovered in the presence of arsenazo III (ARS). Subsequent to a critical evaluation on the impacts of various experimental variables, including the concentrations of acids, THB, and ARS, blank-limited (reagent contamination and impurity from ARS) detection limits (LODs) in the range of 0.004–0.15 μg L–1 were achieved based on three times the standard deviation of the method blank by the proposed vapor generation inductively coupled plasma mass spectrometry (ICP-MS). The nature of released REE species was studied by various approaches and identified to be REE nanoparticles and REE-ARS chelates; a dual-route mechanism for the vapor generation of REEs was thereby proposed.
研究领域:
分析化学
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Ruyi Ji,Yuanyuan Li,Yan Zhang,Ping Wang
Flexible stab-proof membrane is a promising form of anti-stabbing material. The polyvinyl alcohol (PVA), which has good chemical stability, membrane-forming property and degradability, is an ideal choice for preparing membrane materials. However, the mechanical properties of pure PVA membranes are limited, and crosslinking is an effective method to improve the mechanical properties of PVA membrane materials. In present research, tannic acid (TA) and sodium borate (SB) additives were selected as crosslinking agents to prepare PVA composite membranes, and different mass ratios were set to explore the effects of the types and amounts of crosslinking agents on the mechanical properties of the PVA composite materials, especially the stab-proof properties. The principle of the cross-linking was investigated by FTIR and XRD tests, the thermal properties of the composite membranes were investigated by TG and XRD, and the mechanical properties of the composite membranes were comprehensively compared by tensile and puncture test. The results show that the puncture resistance of PVA-SB composite membranes and PVA-TA composite membranes reached the best when the mass ratio is 15:1 and 25:1, respectively, which is 75.76 % and 79.15 % higher than that of pure PVA composite membrane.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Songfeng E,Qin Ma,Jizhen Huang,Zhanfan Jin,Zhaoqing Lu
Aramid nanofibers (ANFs) are outstanding mechanical enhancers of polymers because of the high strength and thermal stability, which also can be processed into macro films through vacuum filtration. However, it is difficult for other additives to improve the mechanical performances of ANFs films except carbon nanotubes (CNT). In this article, polyvinyl alcohol (PVA) and sodium borate (SB) were served as additives to synergistically improve the mechanical performances of ANFs films. It is found that the formed ANFs-PVA-SB ternary composite has a tensile strength of 279.5 MPa and a toughness of 35.7 MJ·m −3 , which are 1.4 and 2.2 times higher than those of neat ANFs films. The high strength is mainly resulted from the fortified hydrogen bonding and physical intertwining between PVA and ANFs, and the formed covalent bonds between PVA and SB, while the high toughness is mainly caused by the soft PVA.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Longjun Rao,Yunfei Yang,Likun Chen,Xiudan Liu,Haixiang Chen,Yuyuan Yao,Wentao Wang
The development of highly efficient and green catalytic oxidation process based on peroxymonosulfate (PMS) activation has been identified to be a significant yet challenging objective in the environmental catalysis field. A simple, environmentally benign and highly effective catalytic oxidation system was innovatively constructed by coupling NaBO 2 and PMS for the removal of Acid Red 1. The catalytic mechanism in the NaBO 2 /PMS system was elucidated by electron paramagnetic resonance (EPR) combined with several radical capture reagents (ascorbic acid, methanol, tert -butyl alcohol, ethanol and l -histidine). The experimental results indicated that singlet oxygen ( 1 O 2 ) severed as the predominant reactive oxygen species (ROS) rather than the HO or during the catalytic oxidation process, at variance with the reported radical pathway in the Co 2+ /PMS system. Inspiringly, p -benzoquinone ( p -BQ) as a trapping agent in most advanced oxidation process could be turned into the positive one in the NaBO 2 /PMS system, achieving a nearly 3-times enhancement in terms of the rate constant for AR1 removal. More interestingly, sodium chloride (NaCl) presented the same enhancement effect as p -benzoquinone due to generation of hypochlorous acid (HOCl) and more 1 O 2 , which was completely different from the reported. This study develops a highly efficient green oxidation process and opens up a new insight in the remediation of contaminated water .
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Jiawen Li,Jing Zou,Shuyin Zhang,Hengyu Cai,Yixin Huang,Jinbin Lin,Qingsong Li,Baoling Yuan,Jun Ma
In this study, sodium tetraborate (Na 2 B 4 O 7 ) was introduced to enhance the degradation of acetaminophen (ACT) in heat-activated peroxymonosulfate (PMS) process. The elimination of ACT in Na 2 B 4 O 7 /heat/PMS process followed the pseudo -first order kinetics. The corresponding k obs value with 10 mM Na 2 B 4 O 7 was 33.1 times higher than that in heat/PMS process. 1 O 2 and HO· were identified as primary reactive species via quenching experiments and electron paramagnetic resonance technology. B(OH) 4 − , the hydrolysis product of Na 2 B 4 O 7 , reacted with PMS to generate HOOB(OH) 3 − . 1 O 2 was generated by the self-decomposition of PMS using B(OH) 4 − as catalyst, while HO· was produced via the breakage of peroxide bond of PMS and HOOB(OH) 3 − under high temperature. ACT was degraded by reactive species via the pathways of -NH- bond breakage, -OH replacement, -NH 2 oxidation and benzene ring cleavage. Nine transformation intermediates were detected by LC/Q-TOF/MS, and the toxicity of reaction solution decreased significantly with the elimination of ACT. Increasing Na 2 B 4 O 7 dosage, PMS concentration, initial pH and reaction temperature were conducive to ACT elimination. Humic acid, Cl − and CO 3 2− inhibited the degradation of ACT heavily, while SO 4 2− and NO 3 − had the negligible effects. Moreover, B(OH) 4 − could react with free chlorine to the inert B(OH) 3 OCl − and further significantly suppress the formation of chlorinated by-products for the treatment of Cl − -containing water in Na 2 B 4 O 7 /heat/PMS process. This study provided an effective way to enhance the oxidation capacity of heat/PMS process and suppress the formation of chlorinated by-products in chloride-containing water, and the findings had important implications for using borate buffer in the studies of PMS-based advanced oxidation processes.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Shiyu Pan,Deling Yuan,Jinhao Li,Zhibin Wang,Qingrui Zhang,Shoufeng Tang
The traditional Fenton application is limited by the disproportionation of hydrogen peroxide (H 2 O 2 ) and the tardy reduction of Fe(III). To conquer these issues, we construct an enhanced Fenton-like process using a composite of citric acid-carboxylated microcrystalline cellulose complexing with Fe(III) (CA-Fe(III)@MCC) to activate sodium perborate (SPB), which can effectively eliminate antibiotic sulfamethoxazole (SMX, 89.2%, 0.035 min -1 ). The CA-Fe(III)@MCC composite significantly enhances the circulation of Fe(III)/Fe(II), leading to the generation of hydroxyl radicals and perboric radicals with excellent structural stability and minimal Fe leaching during CA-Fe(III)@MCC/SPB process. Systematic investigations reveal that the introduced carboxyl groups not only anchor Fe(III) to prevent its deactivation and leaching, but also regulate the coordination environment and serve as electron shuttles, driving the formation of reactive species and reduction of Fe(III). This process presents a novel, environmentally friendly, and sustainable strategy for utilizing natural cellulose and its industrial biomass product in advanced oxidation processes .
研究领域:
环境科学
·
化学工程
·
污染控制
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Shuyin Zhang,Jing Zou,Jiawen Li,Yixin Huang,Jianying Wu,Xiaobin Liao,Qingsong Li,Baoling Yuan,Jun Ma
This study introduced sodium metaborate (NaBO 2 ) into thermal/PMS system to enhance acetaminophen degradation. The added NaBO 2 possessed better performance than sodium tetraborate in accelerating the degradation of acetaminophen with thermal/PMS system over the wide pH range from 3.0 to 11.0. NaBO 2 could be partly hydrolyzed to the strong buffer capacity of the pair of H 3 BO 3 /B(OH) 4 − to well keep the reaction solution pH at 9.4–9.7 regardless of the initial pH. HOOB(OH) 3 − and HOOBO were produced via the reactions between PMS and B(OH) 4 − /BO 2 − . 1 O 2 and HO • were the main ROS accountable for acetaminophen degradation in NaBO 2 /thermal/PMS system. 1 O 2 was mainly formed from the self-decomposition of PMS and the reactions between PMS and HOOB(OH) 3 − /HOOBO. HO • was mainly formed from the thermolysis of the O-O bonds of PMS, HOOB(OH) 3 − and HOOBO. Three elimination pathways of acetaminophen were proposed according to the identified nine elimination intermediates, and the reaction solution toxicity was significantly decreased in NaBO 2 /thermal/PMS system. Improving NaBO 2 dosage, PMS concentration and reaction temperature could accelerate acetaminophen removal. Cl − and Br − significantly promoted acetaminophen removal, while humic acid had the adverse effect. NaBO 2 /thermal/PMS system had well anti-interference capacity for actual water constituents. Moreover, the added NaBO 2 could significantly inhibit the production of chlorinated by-products via the transformation of the free chlorine to the inert product of B(OH) 3 OCl − in Cl − -containing water treatment with NaBO 2 /thermal/PMS system. This study provides an effective method for improving the thermal/PMS system oxidation capacity and suppressing the chlorinated by-products production in Cl − -containing water treatment.
研究领域:
环境科学
·
水处理技术
·
氧化工艺
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 22
·5352
·
IF 4.2
Fan Chen,Lu Li,Shunfan Qiu,Shiyang Chen,Lingfang Yang,Lin Deng,Zhou Shi
In this study, the sodium perborate (SP)-activated peroxymonosulfate (PMS) process was used to enhance the coagulation efficiency of cyanobacteria with polymeric aluminum chloride (PAC), aiming to efficiently mitigate the impact of algal blooms on the safety of drinking water production. The optimal concentrations of SP, PMS, and PAC were determined by evaluating the removal rate of OD680and zeta potential of the algae. Experimental results demonstrated that the proposed ternary PMS/SP/PAC process achieved a remarkable OD680removal efficiency of 95.2%, significantly surpassing those obtained from individual treatments with PMS (19.5%), SP (5.2%), and PAC (42.1%), as well as combined treatments with PMS/PAC (55.7%) and PMS/SP (28%). The synergistic effect of PMS/SP/PAC led to the enhanced aggregation of cyanobacteria cells due to a substantial reduction in their zeta potential. Flow cytometry was performed to investigate cell integrity before and after treatment with PMS/SP/PAC. Disinfection by-products (DBPs) (sodium hypochlorite disinfection) of the algae-laden water subsequent to PMS/SP/PAC treatment declined by 57.1%. Moreover, microcystin-LR was completely degraded by PMS/SP/PAC. Electron paramagnetic resonance (EPR) analysis evidenced the continuous production ofSO4•−, •OH,1O2, andO2•−, contributing to both cell destruction and organic matter degradation. This study highlighted the significant potential offered by the PMS/SP/PAC process for treating algae-laden water.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
·
2017
·
IF 0
Hao Zhong,Liu Zhang Ouyang,Jian Shan Ye,Jiang Wen Liu,Hui Wang,Xiang Dong Yao,Min Zhu
The hydrolysis of NaBH 4 offers significant advantages for hydrogen storage in fuel cells, whereby suffers from the irreversibility . Thus, a simple and low cost method for NaBH 4 regeneration from its hydrolysis byproduct is crucial. Herein, we describe a single step method for NaBH 4 regeneration, which combines both hydrogen production and storage in the one step. In the process, a mixture of magnesium silicide and dihydrate sodium metaborate is reacted via ball milling under ambient conditions without the requirements of additional hydrogen sources . The hydrogen only comes from the splitting of H 2 O in the NaBO 2 ·2H 2 O that is a direct byproduct of NaBH 4 hydrolysis. The purified product demonstrates the same physicochemical properties as commercial NaBH 4 . Yields for NaBH 4 regeneration approaching 80% are achieved using this method. Mechanism study indicates that the high yield is likely to be beneficial from the formation of the Mg-O-Si-H conjugated structure. NaBH 4 regeneration using this process demonstrates a 30-fold reduction in cost over a previous study that used MgH 2 as the reduction agent.
研究领域:
化学
·
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
INDUSTRIAL CROPS AND PRODUCTS
·
2017
·
IF 3.181
Mengmeng Yao,Yiqin Yang,Junlong Song,Yan Yu,Yongcan Jin
In order to valorize lignin from spent liquor of pulping mills, a novel catalyzing system for wood furfurylation which composed of lignin-derived acids (LDAs, i.e. lignosulfonic acid and sulfomethylated lignin acid) and buffer sodium borate was developed, and was applied to Chinese fir furfurylation for improved dimensional stability and mechanical properties. LDAs were prepared by protonating of sulfomethylated lignin and lignosulfonate through cation exchange resin. The catalyzing system was optimized by the storage duration of FA formulas with respective catalyzing system at room temperature and the curing time at elevated temperature. Then, three formulas were selected out to treat Chinese fir and their performance was evaluated by weight percentage gain, dimensional stability, and compressive strength. The results showed that LDAs, especially sulfomethylated lignin acid, penetrated into cell walls and catalyzed furfurylation reaction quite well. The best performance achieved in this study by Formula III was with weight percentage gain of 66.4%, equilibrium moisture content 12.9%, anti-swelling efficiency 61.9% and 70.6% for the conditions of high humidity and water-soaking, respectively; its parallel-to-grain compressive strength was improved by 45.4%. It hints lignin-derived acids combined with borate would be a promising catalyst system for wood furfurylation since it valorizes both the waste lignin and low-valued wood.
研究领域:
林产化学与技术
·
木材科学与技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）