Removal Of Hydrochloride Research Articles

Introduction of alkyl and sulfonic groups in Ti-metal-organic framework for boosting removal of metformin hydrochloride

Removal of metformin hydrochloride (Met•HCl) is necessary but still faces challenges. Our work reported a new adsorbent (MIL-125-NH-RSO3H, R = CH2CH2CH2), constructed via the post-synthesis covalent reaction between MIL-125-NH2 and 1,3-propanesultone. Compared with the pristine MIL-125-NH2, the newly obtained material shows improved negative surface property and enhanced hydrophobicity, ascribed to the contributions from -SO3H and the alkyl groups respectively. As a result, the adsorption capacity of MIL-125-NH-RSO3H can reach 164 mg•g−1, superior to the unmodified sample and other reported porous materials. The adsorption behavior follows the Langmuir model and pseudo-second-order model. The adsorbent possesses excellent anti-interference ability from co-existing salts and can be well regenerated through a simple elution method. Therefore, our work provides a new sight to construct high-efficiency adsorbents by simultaneously improving various host-guest interactions.

Effects of chitosan and piperazine on surface morphology and mebeverine hydrochloride removal in polyurea thin film composite membranes

Effects of chitosan and piperazine on surface morphology and mebeverine hydrochloride removal in polyurea thin film composite membranes

Mechanism of Phanerochaete chrysosporium-mediated tetracycline hydrochloride removal promoted by low-dose silver nanoparticles

The influence of silver nanoparticles (AgNPs) on environmental microorganisms has been extensively reported, however, there is currently limited understanding of effects of stress-induced by AgNPs on other pollutant degradation. In this study, Phanerochaete chrysosporium was stimulated by different concentrations of AgNPs to explore its effect on P. chrysosporium-mediated degradation of tetracycline hydrochloride (TCH). The results indicate that treatment with AgNPs at low concentration resulted in a considerable increase in TCH degradation, TCH degradation reached a maximum of 97% with 0.1 mg L−1 AgNPs treated after 3 d, and the viability of P. chrysosporium increased 1.48 times compared with the control group. The largest O2 influx of − 17 pmol cm−2 s−1 under 0.1 mg L−1 AgNPs treatment reveal the enhancement of P. chrysosporium respiration. In addition, low concentrations of AgNPs could induce the overexpression of cytochrome P450 and extracellular degradation enzymes MnP-related genes in stimulated cells, which further induce the production of extracellular degrading enzymes (51.0 U L−1 MnP and 23.7 U L−1 LiP) to accelerate the degradation of TCH. Together, our combined results uncovered the enhanced degradation mechanisms of P. chrysosporium induced by which AgNPs under sublethal dosage.

Removal of doxycycline hydrochloride from aqueous solution by rice husk ash using response surface methodology and disposability study.

The huge demand and consumption of DOX, its incomplete metabolism, and complex behavior in atmosphere are causing a great ecological issue, which needs to be solved. In the present study, the suitability of rice husk ash (RHA) for the greater sorption efficiency of DOX antibiotic was investigated. Furthermore, disposability study of exhausted RHA was performed using solidification technique and leachate had undergone toxicity test to evaluate the DOX encapsulation ability. The central composite design under RSM was employed for the design of experiment and optimization of adsorption parameters. RHA was characterized using various techniques such as XRD, SEM (EDX), FTIR, BET, and zeta potential analysis. The influence of various adsorption parameters, like initial DOX concentration (C0), RHA dosage (m), incubation-time period (t), and pH were examined on the performance in terms of DOX elimination % (X1) and adsorptive capacity (mg/g) (X2). At optimized conditions, the obtained X1 and X2 were 98.85% and 17.74 mg/g, respectively. Moreover, the kinetics data suited well to the pseudo–second-order model. Freundlich, Langmuir, and Redlich-Peterson (R-P) isotherm models were applied, out of which Langmuir model best performed under optimized conditions; m = 5 g/L, t = 85.85 min, DOX concentration = 89.73 mg/L, and pH = 6. The bacterial toxicity test of leachate confirmed complete encapsulation of DOX by solidification technique.Supplementary InformationThe online version contains supplementary material available at 10.1007/s11356-022-18961-1.

Adsorptive decontamination of doxycycline hydrochloride via Prosopis juliflora activated carbon: Parameter optimization and disposal study

This study deals with the removal of doxycycline hydrochloride (DOX) antibiotic, from aqueous environment by using Prosopis juliflora activated carbon (PJAC). PJAC was synthesized by chemical activation and pyrolysis of Prosopis juliflora. It was characterized by employing Fourier transform infrared spectroscopy (FTIR), scanning electron microscope-energy dispersive X-ray analysis (SEM-EDX), X-ray diffraction analysis (XRD), and Brunauer-Emmett-Teller (BET) techniques. The specific surface area, pore volume, and pore diameter were evaluated as 320.45 m2 /g, 0.176 cm3 /g, and 2.65 nm, respectively. Different functional groups (O-H, C-O, C=C, C-N, and C-C) present on PJAC promoted the adsorption of DOX. The influence of various adsorption parameters suggested by central composite design (CCD) model was determined using response surface methodology (RSM), and interactive effects of these were optimized. The thermodynamic and kinetic studies performed at optimized conditions, exhibited that adsorption was spontaneous and endothermic. The experimental data were well described with Langmuir, Redlich-Peterson, and Freundlich isotherm models while kinetics data were well described by pseudo second order. The excellent interactions between the PJAC and DOX resulted maximum adsorption capacity as 57.11 mg/g. The adsorption mechanisms was dominated by - interactions and hydrogen bonding. Moreover, almost complete encapsulation of DOX was achieved by stabilization of exhausted PJAC. PRACTITIONER POINTS: A wild harmful plant Prosopis juliflora was used to synthesize a low-cost and eco-friendly bio-sorbent PJAC. Adsorptive ability of PJAC was quantified for adsorption of DOX antibiotic from its aqueous solution. DOX uptake on PJAC was mainly governed by л-л EDA interactions and hydrogen bonding.

Magnetite graphene oxide modified with β-cyclodextrin as an effective adsorbent for the removal of methotrexate and doxorubicin hydrochloride from water

The purpose of this investigation was to analyze the performance of magnetite graphene oxide modified with β-cyclodextrin (GO@Fe3O4@β-CD) for adsorption of methotrexate (MTX) and doxorubicin (DOX) from aqueous solutions. Characterization of GO@Fe3O4@β-CD was carried out using some methods. The perfect conditions for the adsorption of MTX and DOX were 7.0, 45min, 20mg, and 25°C for solution pH, contact time, adsorbent dose, and temperature, respectively, with removal efficiency values of 97.8% and 98.5% for MTX and DOX, respectively. The adsorption kinetic of MTX and DOX via GO@Fe3O4@β-CD followed pseudo second-order (PSO) model, while the adsorption isotherm obeyed Langmuir model by monolayer adsorption with maximum adsorption capacities of 198.5 and 204.5mgg-1 for MTX and DOX, respectively. Therefore, it could be argued that HCl and 0.1mol L-1 NaOH would reflect adequate elution properties for GO@Fe3O4@β-CD recovery.

Removal of tramadol hydrochloride, an emerging pollutant, from aqueous solution using gamma irradiation combined by nanofiltration

Tramadol hydrochloride (TRAH) is an analgesic widely used in recent decades. This medicine is classified as an emerging contaminant, responsible for environmental damage and aquatic toxicity, that conventional wastewater treatment technologies are unable to successfully eliminate. This study focuses on TRAH degradation in aqueous solution by integrated methods of advanced oxidation and membrane filtration. Gamma irradiation was employed as advanced oxidation process (AOP) and the nanofiltration (NF) membrane was applied for the separation procedure. Indeed the degradation of TRAH solution by gamma irradiation was investigated by applying absorbed doses varying between 0.05 and 5 kGy. The experimental results indicate that at an initial concentration of 20 mg L−1, the maximum TRAH removal efficiency was 100% at 5 kGy while the removal efficiency of total organic carbon (TOC) was 78.7% at the same dose. NF enabled the rejection of TRAH and the efficiency did not exceed 90%. The integration of the two methods was then proposed and the results give 99.7%TRAH elimination and 81.5% TOC removal by a low absorbed dose of 0.4 kGy and applied pressure of 8 bar. The overall results show that the proposed coupled process in the first time is a suitable alternative for TRAH and TOC removal in an economic way with low energy consumption and sustainable as proven by the absence of chemical additives.

Synthesis of bimetal MOFs for rapid removal of doxorubicin in water by advanced oxidation method.

Doxorubicin (DOX) has been an emerging environmental pollutant due to its significant genotoxicity to mankind. Advanced oxidation processes are a potential strategy to remove DOX in water solution. To develop a highly efficient catalytic agent to remove DOX, bimetal MOFs were synthesized, with Cu2+ and Co2+ as the central ions and adenine as the organic ligand. This study investigated the degradation of DOX by Co/Cu-MOFs combined with peroxymonosulfate (PMS). It was found that the degradation of DOX by Co/Cu-MOFs can reach 80% in only 10 seconds. This can be explained by the charge transfer from Co(iii) to Co(ii) being accelerated by Cu2+, resulting in the rapid generation of free radicals, which was proved by the EIS Nyquist diagram. Co/Cu-MOFs can be reused by simply washing with water without inactivation. Therefore, Co/Cu-MOFs can be used as an efficient catalytic agent to degrade DOX in environmental water.

Synergetic effect of photocatalysis and peroxymonosulfate activation by CoTiO3/SBA-15, NiTiO3/SBA-15 and Fe2TiO5/SBA-15 for efficient photocatalytic removal of oxytetracycline hydrochloride

Peroxymonosulfate was activated by photogenerated e−, Co, Ni and Fe.

High Capacity of Oxytetracycline Hydrochloride Removal in Wastewater Via Mikania Micrantha Kunth-Derived Biochar Modified by Zn/Fe-Ldh

High Capacity of Oxytetracycline Hydrochloride Removal in Wastewater Via Mikania Micrantha Kunth-Derived Biochar Modified by Zn/Fe-Ldh

Degradation intermediates of Amitriptyline and fundamental importance of transition metal elements in LDH-based catalysts in Heterogeneous Electro-Fenton system

• Valence electron structure and cohesive energy of OH cleavage process were obtained. • Transition metals are robust electron donors for OH yield implying its ratio pivotal. • Excellent mineralization of AMTH was observed at all pH values after 8 h treatment. • Degradation pathways and intermediates of Amitriptyline were elaborated. This study proposes an efficient Layered Double Hydroxide-based (LDH-based) Heterogenous Electro Fenton (Hetero-EF) strategy that ensures the stable operation for representative antidepressants Amitriptyline Hydrochloride removal in a wide pH tolerance. The extra brilliant mineralization ability was over ∼ 90% after 5 cycles. Moreover, the detailed degradation pathways and intermediates of Amitriptyline Hydrochloride were firstly elucidated and probed using ultra performance liquid chromatography quadrupole-time-of-flight mass spectrometry (UPLC-QTOF-MS). According to the Density Functional Theory and D-Band Center Theory, the subsequent computational simulation shed new light on the ability of LDH catalyzing for hydroxyl radical formation, the relevant role of transition metal atoms in LDH catalysts, and the electrons transfer process in the Hetero-EF reaction, i.e., LDH’s metal atoms are robust electron donor sites for the generation of hydroxyl radical and charges transformation for the redox reaction, which highlights the importance of the transition metal elements in catalysts and exerts feasibility for enhancing the performance of Heterogeneous Electro-Fenton (Hetero-EF). Thereby, this research proposes a reliable strategy for building efficient Hetero-EF systems and gives a global contribution to developing the high-performance LDH EF-catalysts through the optimization of the metal atom ratio modification, synthesis parameters, and computational modeling.

Fabrication of lignin-based biochar containing multi-metal ferrite and efficient removal for oxytetracycline hydrochloride

Efficient removal of oxytetracycline hydrochloride (OTC) from wastewater is of great significance but extremely challenging. Herein, a novel adsorbent lignin-based multi-metal ferrite biochar (FeNiZn-LBC) was synthesized through pyrolysis with controllable temperature and hydrothermal reaction using lignin of sinocalamus oldhami as raw material. The adsorption property of FeNiZn-LBC for OTC was systematically researched, and the results displayed that adsorption of FeNiZn-LBC to OTC accorded with the Langmuir model and the equilibrium adsorption capacity was 476 mg g−1. Notably, FeNiZn-LBC can be regenerated with 0.100 mol L−1 NaOH. Additionally, we raised rational explanations for the mechanisms of adsorption behavior based on the zeta potential and XPS spectra. The adsorption of FeNiZn-LBC for OTC was mainly controlled by the electrostatic interactions, hydrogen bonds and complexation involving FeNiZn-LBC and OTC, especially the metal-oxide bond (M-O) generated after loaded with multi-metal ferrite played a positive role in the removal of OTC from water. Our work highlighted the potential of FeNiZn-LBC for excellent adsorption of OTC in next generation.

Bi@BiOx(OH)y modified oxidized g-C3N4 photocatalytic removal of tetracycline hydrochloride with highly effective oxygen activation

A novel Bi@BiOx(OH)y-modified oxidized g-C3N4 photocatalyst was successfully prepared via wet chemical reduction under alkaline conditions for the tetracycline hydrochloride removal. The prepared materials were characterized comprehensively and fully. Sufficient structural representation analyses confirmed the successful loading of Bi in the form of Bi@BiOx(OH)y complex beads. Based on basic photocatalytic studies, 10% (mass percentage) was found to be the best metal Bi loading. DRS, PL, transient photocurrent and EIS have explored the improvement of the photochemical properties of materials by loading Bi@BiOx(OH)y groups, particularly the improvement of photocatalytic properties by the SPR effect and electron traps. 10%Bi-OxCN exhibited the most suitable particle size of nonagglomerated Bi-metal groups, the largest specific surface area (43.53 m2 g–1), the most adsorption sites and the most significant photocurrent (8.694 × 10−2 mA cm−2) (7.78 times that of OxCN). This indicated that 10%Bi-OxCN had good adsorption capacity and excellent light response capability. In addition, 10%Bi-OxCN showed the best tetracycline hydrochloride removal efficiency (96.0%), with ∙O2– as the main active substance and 1O2 as the second most important substance made of ∙O2– and h+. The excellent photocatalytic effect and good reusability were fundamentally dependent on the modification of OxCN by Bi@BiOx(OH)y groups to produce a large number of active substances (including the separation efficiency of electron-hole pairs and the generation efficiency of ∙O2− and 1O2). These advantages are all related to the high specific surface area, a large number of active sites, narrow bandgap width, Bi-SPR effect, and BiOx(OH)y electron trap caused by successful loading of Bi groups.

All-solid-state Z-scheme heterostructures of 1T/2H-MoS2 nanosheets coupled V-doped hierarchical TiO2 spheres for enhanced photocatalytic activity

Highly efficient all-solid-state Z-scheme semiconductors are of great significance to the photocatalytic performance. Herein, we design and construct edge-rich bicrystalline 1T/2H-MoS2 nanosheet cocatalyst modified V-doped hierarchical TiO2 microspheres for the photocatalytic removal of oxytetracycline hydrochloride. In this catalyst system, the conductive 1T phase of MoS2 accelerates the charge transfer kinetics and works as an electron mediator in a Z-scheme, while 2H phase of MoS2 and V-TiO2 is the photosensitizer and reactant adsorbed sites, respectively. The optimized VTM-5% heterojunction possesses superior degradation efficiency than that of bare components, which is ascribed to the enhanced light-harvesting capacity, populated exposed active sites, rapid photogenerated charge transfer, and excellent affinity to reactant molecules. Moreover, a built-in electric field forms via an intensive electronic interaction of positively charged V-TiO2 and negatively charged 1T/2H-MoS2, as confirmed by density functional theory calculation. This study provides new insights into the rational design of noble metal-free cocatalyst-based Z-scheme photocatalysts toward environmental remediation.

Two-electron transfer mechanism from 3D/3D nickel selenide/MoS2 heterostructure accelerates photocatalytic hydrogen evolution and tetracycline hydrochloride removal

Establishing highly effective charge transfer channels and providing adequate active sites for improving the activity of photocatalyst is still a challenging issue. Herein, a novel marigold-like NiSe2/MoS2 hierarchical heterostructure is firstly reported via in situ deposition of mesoscale hedgehog NiSe2 nanoparticles on the nanosheet edge of MoS2 flowerspheres. The optimal 5.4% NiSe2/MoS2 composite exhibits moderate hydrogen evolution rate of 2473.7 μmol·h−1·g−1 without any noble metal cocatalysts and achieves mineralization capacity for tetracycline hydrochloride (58.1%) after 120 min, respectively. The transfer pathway of photogenerated charge carriers, the generation process and function of different reactive oxygen species (·O2–, ·OH, 1O2 and H2O2) are detailedly discussed. Based on the results of various characterizations and DFT calculations, the improvement of photocatalytic performance could be derived from the unique morphology effect with numerous reactive sites and extended light harvesting ability, as well as the type-II heterojunction with promoted photocarriers separation efficiency and lower interfacial migration impedance, which arose from a continuous two-step/two-electron reduction pathway. The developed synthetic strategy may provide new inspirations for the rational design and construction of high efficiency photocatalysts with hierarchical structures for energy conversion and water environment remediation.

2D/2D FeNi-layered double hydroxide/bimetal-MOFs nanosheets for enhanced photo-Fenton degradation of antibiotics: Performance and synergetic degradation mechanism

The photo-Fenton system exhibits great potential in environmental remediation. However, photo-Fenton process suffers from slow reaction kinetics, which is caused by the low yield of available charge carriers and active radicals. In this work, the 2D/2D FeNi-layered double hydroxide/bimetal-organic frameworks nanosheets (FeNi-LDH/BMNSs) photocatalyst was fabricated via an in-situ semi-sacrificial template strategy. The optimized FeNi-LDH/BMNSs + H2O2+Vis system showed excellent tetracycline hydrochloride (TC-HCl) removal rate of 95.76% in 60 min. Besides, the high TC-HCl degradation rates (above 80%) are obtained in a wide pH range and the total organic carbon (TOC) removal rate of 48.98% was remained after four cycles. Experiments and characterizations identified the fast catalysis process were ascribed to the synergetic effect between 2D/2D heterojunctions and Lewis acid sites with mixed-valence (Fe (III)/Ni (II)) in FeNi-LDH/BMNSs. As a result, the catalysis of H2O2 and the reduction of O2 was accelerated by the continuous generation of Fe (II) and available photogenerated electrons, respectively, producing abundant active radicals including OH and O2−. Finally, this photo-Fenton system exhibited high removal rate to oxycycline, levofloxacin, norfloxacin and doxycycline and showed excellent performance for TC-HCl removal in different composed wastewater. The findings provide a new strategy towards creating 2D/2D active heterogeneous catalysts for photo-Fenton catalytic application.

A Facile Fabrication of ZnFe2O4/Sepiolite Composite with Excellent Photocatalytic Performance on the Removal of Tetracycline Hydrochloride.

The excellent photo-response of ZnFe2O4 in the visible light region makes it a promising catalyst, whereas some defects like serious particle agglomeration and easy recombination of photo-generated electron-hole pairs hinder its application. In this work, the ZnFe2O4/sepiolite (ZF-Sep) composites were synthesized using a co-precipitation method. The obtained ZF-Sep composites were characterized by XRD, SEM, TEM, FT-IR, XPS, BET, VSM and DRS. Moreover, the photocatalytic performance was evaluated by the tetracycline hydrochloride removal efficiency under simulated visible light illumination. The results displayed that the ZnFe2O4 with average sizes about 20 nm were highly dispersed on sepiolite nanofibers. All the composites exhibited better photocatalytic performance than pure ZnFe2O4 due to the synergistic effect of the improvement on the agglomeration phenomenon of ZnFe2O4 and the reduction on the recombination rate of photo-generated electrons and holes. The optimum removal efficiency was that of the ZF-Sep-11 composite, which reached 93.6% within 3 h. Besides, the composite exhibited an excellent stability and reusability. Therefore, ZF-Sep composite is a promising catalyst for the treatment of wastewater contained antibiotics.

Synthesis of nanocrystalline cellulose/hydroxyapatite nanocomposites for the efficient removal of chlortetracycline hydrochloride in aqueous medium

The presence of antibiotics in the water has potential impacts on the environment and consequently their removal is of great importance. In this article the possibility of chlortetracycline hydrochloride (CTC·HCl) removal from aqueous medium by using eco-friendly nanocrystalline cellulose-hydroxyapatite composites (NCC/HAPs) as adsorbents is reported. The NCC/HAPs were synthesized by a simple in-situ precipitation method and their structural properties were studied. The HAP nanoparticles were successfully incorporated on the surfaces of synthesized NCC/HAPs. A set of systematically designed experiments were carried out to determine the influences of the amount of NCC, pH, contact time, initial concentration, and adsorbent dosage on the adsorption behavior of NCC/HAPs. A high CTC·HCl removal rate of about 70.81% in 10 min was obtained, and NCC and HAP showed obviously synergistic effect on absorbing CTC·HCl. The structure analysis, kinetics, mechanistic studies, intraparticle diffusion model and Zeta potential tests demonstrated that the removal of CTC·HCl from aqueous media are attributed to van der Waals interaction, electrostatic interactions, cation-exchange, complexation and bridging, complexation and hydrogen bonding. Overall, the findings presented in this paper suggest that NCC/HAP has promising applicability for the removal of antibiotics from aqueous media as an alternative and eco-friendly adsorbent for environmental remediation.

Core-shell structured Cu2O@HKUST-1 heterojunction photocatalyst with robust stability for highly efficient tetracycline hydrochloride degradation under visible light

Constructing heterojunction has been widely applied in optimizing photocatalysts for organic pollutant removal. However, incompact contact interface and inappropriate band alignment in the heterointerface of two materials increase interfacial recombination, lowering the degradation efficiency. Herein, a facile strategy without any other surfactants or modification pretreatment was employed to encapsulate cubic Cu2O using metal-organic frameworks (MOFs) to construct heterojunction photocatalysts. The oriented growth of Cu-MOFs (HKUST-1) around cubic Cu2O (Cu2O@HKUST-1) with desired feedstock ratio for enhanced photocatalytic degradation performance was achieved. Compared with the individual components, the optimized Cu2O@HKUST-1 heterostructures exhibited enhanced tetracycline hydrochloride (TC-HCl) removal rate of 93.40% within 60 min under visible light irradiation. Obviously, mechanism exploration revealed that the combined effect between the core-shell structure with compact interfacial contact and an ideal type-II band alignment in Cu2O@HKUST-1 increased the carrier density and accelerated interfacial charge separation and transfer. Meanwhile, HKUST-1 shell protected Cu2O core from the photocorrosion well, assuring the robust stability of photocatalyst during the photocatalytic process. After the fourth cycle, the photocatalytic TC-HCl degradation efficiency and total organic carbon (TOC) removal rate by Cu2O@HKUST-1 remained at 90.02% and 49.64%, respectively. The radical trapping results and electron spin resonance (ESR) identified the h+ and O2− were main active species in this photocatalytic degradation system. Besides, the TC-HCl degradation pathway was investigated by three-dimensional excitation-emission matrix fluorescence spectra and liquid chromatography-mass spectrometry technology. This work provides a facile method towards creating efficient and stable photocatalyst for organic pollutant removal.

A resin containing motifs of maleic acid and glycine: a super-adsorbent for adsorptive removal of basic dye pararosaniline hydrochloride and Cd(II) from water.

The cyclocopolymerization of N,N-diallylglycine hydrochloride, maleic acid and 1,1,4,4-tetraallylpiperazinium dichloride afforded a cross-linked polyzwitterionic acid, which, upon treatment with NaOH, gave the corresponding cross-linked anionic polyelectrolyte (CAPE) in quantitative yield. The pH-responsive resins contained a high density of CO2 - motifs as well as the chelating motifs of glycine residues. The resin CAPE was found to be a super-adsorbent for the removal of pararosaniline hydrochloride (PRH); having a q max of 1534mg/g. The adsorption process followed pseudo-second-order kinetics and was found to be a nearly irreversible process as suggested by the parameters obtained from Elovich kinetic model. The resin demonstrated excellent adsorption/desorption efficiencies, thereby ensuring its recycling and reuse in potent applications like remediation of industrial dye-waste water. The resin's chelating motifs were also efficient in the adsorptive removal of Cd(II) ions with a q max of 248mg/g. It was also employed for the simultaneous and effective trapping of Cd(II) and the dye from industrial wastewater. The resin's impressive performance accords it a prestigious place among many sorbents in recent works.