Degradation Of Rhodamine Research Articles

Synthesis and photocatalytic mechanism study of visible light-driven Z-type Ag/AgBr/Bi2MoO6 composite materials for efficient degradation of organic dyes

The synthesis of the Ag/AgBr/Bi2MoO6 nanocomposite was achieved through a facile hydrothermal method combined with in situ photodeposition. Subsequently, its efficacy in catalyzing the degradation of Rhodamine B (RhB) under visible light irradiation was systematically investigated. The Bi2MoO6 samples and the Ag/AgBr/Bi2MoO6 nanocomposites underwent comprehensive characterization using a suite of techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The analyses unveiled a homogeneous distribution of Ag nanoparticles on the surface of AgBr/Bi2MoO6, indicative of the successful formation of the composite. To assess the photocatalytic efficiency, the degradation of RhB under visible light irradiation was employed as a benchmark. Notably, the incorporation of Ag nanosheets, serving as electron mediators and Schottky barriers, facilitated efficient electron transfer between Bi2MoO6 and AgBr. Consequently, the photocatalytic activity of the ternary Z-type heterogeneous Ag/AgBr/Bi2MoO6 nanocomposites surpassed that of the pure Bi2MoO6 and AgBr samples. Remarkably, under 12 min of visible light irradiation, the photocatalytic activity of the Ag/AgBr/Bi2MoO6 nanocomposites reached an impressive 99.99 %.

Application of novel Zn-MIL53(Fe) for removal of micropollutants using an activated peroxymonosulphate system

Novel zinc-doped Metal-Organic Framework based on MIL53(Fe) (Zn-MIL53(Fe)) has been successfully synthesised in one-step, exhibiting dual applications as adsorbent and catalyst. Initially, the adsorption capacity of MIL53(Fe) and Zn-MIL53(Fe) for removing Rhodamine B was assessed through kinetic and isotherm studies. The bimetallic variant exhibited superior performance, showcasing enhanced adsorption capabilities, particularly in the context of its physical interaction under natural pH. After that, the catalytic activity of both synthesised materials was evaluated to generate sulphate radicals by activating PeroxyMonoSulphate (PMS). It was also demonstrated that Zn-MIL53(Fe) exhibited the best catalytic activity being optimised using response surface methodology for Rhodamine B degradation (0.11 mM PMS and 43.2 mg Zn-MIL53(Fe)). Under optimal conditions, favourable outcomes were attained, facilitating the degradation of Rhodamine B, Fluoxetine, and Sulfamethoxazole by 93, 99, and 75 %, respectively. Furthermore, the operational stability of the Zn-MIL53(Fe) was verified, as it remains structurally and catalytically intact after different cycles.

Fabrication and improved photocatalytic performance of 2D/0D structured g-C3N4/WO3 composite materials

In this work, WO3 quantum dots grow in situ on the synthesized ultra-thin g-C3N4 nanosheets, ultimately forming a type of tightly bound 2D/0D Z-type heterojunctions. It was found that WO3 quantum dots were closely combined with g-C3N4 nanosheets through SEM and TEM measurements. XRD, IR, and XPS characterization proved a g-C3N4/WO3 heterojunction material was formed. The construction of g-C3N4/WO3 heterojunctions enhanced visible light absorption, improved carrier separation efficiency, and reduced charge transfer resistance. Photocatalytic hydrogen production tests showed that the hydrogen production rate of 20% g-C3N4/WO3 composite materials was 2.8 times that of the original g-C3N4, and the hydrogen production amount within 3 h was 3.7 times that of the original g-C3N4. Photocatalytic degradation of Rhodamine B and 4-chlorophenol under visible light irradiation showed that compared with g-C3N4, the photocatalytic degradation efficiency of 20% g-C3N4/WO3 composite materials was enhanced. The results reveal that the special structured g-C3N4/WO3 composite materials have excellent photocatalytic activity, which can not only efficiently produce hydrogen but also efficiently degrade organic pollutants, providing an important reference for solving energy crises and environmental problems.

SnO2 nanoparticles: synthesis, characterization and photocatalytic activity

SnO2 nanoparticles have been synthesized using precipitation method and heat treatment. Firstly, SnCl4.5H2O was reacted with NaOH solution, and than the precipitate heat treated at 350 oC, 450 oC and 550 oC. The obtained materials were characterized by X-Ray diffraction (XRD) infrared spectra (IR) energy-dispersive X-ray spectroscopy (EDS) scanning electron microscopy (SEM) and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The photocatalytic degradation of rhodamine B (RhB) using SnO2 nanoparticles was investigated. The results show that the SnO2 nanoparticles exhibited a significantly enhanced photocatalytic activity. The photoactivity of SnO2 nanoparticles photocatalysts can be ascribed to the enhanced electron-hole separation.

Molten salt synthesis of porous graphene-like carbons as peroxydisulfate catalyst for the efficient removal of rhodamine B dye.

Carbon materials have been receiving considerable attention as effective green catalysts for peroxydisulfate (PDS) activation to degrade organic pollutants. Herein, the porous graphene-like carbons (PGCs) were synthesized by pyrolyzing a nitrogen-rich biomass (peanut shell, PS) in the eutectic mixture of FeCl3 and ZnCl2. The results suggested that involvement of molten salts attributed the biochar the amazing properties such as high specific surface area (SBET = 2529.4 m2g-1), abundant structural defects, high nitrogen content (6.5%), and oxygen-containing functional groups on its surface. Especially when pyrolyzed at activation temperature of 800°C, mass ratio of 1:3:15 (PS:ZnCl2:FeCl3), and activation time of 2h, the optimized PGCs-op exhibited outstanding performance in the catalytic degradation of rhodamine B (RhB). Almost all of RhB (99.02%) was removed in 40min and basically not influenced by initial pH in the range of 3.00 to 9.98. Although the RhB degradation was influenced by anions (Cl-, HCO3-, HPO42-), the inhibition would be significantly alleviated within 120min unless these substances were high in concentration. Furthermore, the quenching tests revealed that the reactive species were involved in RhB degradation in the sequence of 1O2 > O2∙- > SO4∙- > ∙OH, among which singlet oxygen played a crucial role. Combined with characterization analysis, a possible mechanism of RhB degradation in PGCs-op/PDS system was proposed. Overall, this study provided a promising metal-free catalyst for the removal of organic pollutants while achieving reutilization of the waste biomass.

Supermolecule polymer derived of carbon nitride with controllable nanosheet for enhancing the degradation performance of RhB and BPA

Using melamine-cyanuric acid (MCA) supramolecular polymer as a precursor, a method was employed to synthesize graphitic carbon nitride with a large specific surface area and controllable band structure. The band structure and morphology of graphitic carbon nitride (g-C3N4) are closely related to the type of solvent used. By treating it with hypophosphorous acid and subsequent high-temperature treatment for 10 h , the precursor material was calcined to produce graphitic carbon nitride with a hollow tubular morphology. Experimental results demonstrate that this material exhibits outstanding performance in photocatalytic degradation of Rhodamine B and Bisphenol A. This work provides a new and effective strategy for achieving visible-light photocatalytic degradation of organic compounds.

Visible light responsive photocatalytic fuel cell with Ce-UiO-66/g-C3N4/Bi2WO6/Ti photoanode for simultaneous degradation of rhodamine B and electricity generation

In order to enhance the carrier separation efficiency and redox ability of photoanode, a dual Z-scheme heterojunction Ce-UiO-66/g-C3N4/Bi2WO6/Ti photoanode was prepared and assembled with Cu cathode to form PFC. The characterization results show that Ce-UiO-66/g-C3N4/Bi2WO6 uniformly distributed on the Ti substrate, with average crystallite size of 9.04 nm and average particle size of 33.05 nm, which provides sufficient reactive active sites for RhB degradation. The RhB degradation rate, Pmax, Jsc, Voc and FF of the PFC were 90.9 % (90 min), 7.53 µW cm-2, 0.152 mA cm-2, 0.37 V and 0.134, respectively. The turnover frequency (TOF) for RhB degradation by the PFC reached 0.98 h-1. Fermi energy level analysis shows that a double-Z heterojunction is formed between Bi2WO6 and g-C3N4, and between Bi2WO6 and Ce-UiO-66, which not only effectively separates photogenerated e--h+, but also retains the high redox ability of the composite. Moreover, with the introduction of Ce-UiO-66, the composite photoanode has larger specific surface area and wider visible light absorption range. In addition, because of the built-in electric field, the photogenerated electrons can migrate to the surface of composite particles more easily and react with dissolved oxygen to generate more •O2- to participate in the degradation of RhB. This work provides a valuable reference for developing PFC photoanode with high efficiency and visible light response.

Hydrophilicity and Pore Structure Enhancement in Polyurethane/Silk Protein-Bismuth Halide Oxide Composite Films for Photocatalytic Degradation of Dye.

Polyurethane/silk protein-bismuth halide oxide composite films were fabricated using a blending-wet phase transformationin situsynthesis method. The crystal structure, micromorphology, and optical properties were conducted using XRD, SEM, and UV-Vis DRS characterize techniques. The results indicated that loaded silk protein enhanced the hydrophilicity and pore structure of the polyurethane composite films. The active species BiOX were observed to grow as nanosheets with high dispersion on the internal skeleton and silk protein surface of the polyurethane-silk protein film. The photocatalytic efficiency of BiOX/PU-SF composite films was assessed through the degradation of Rhodamine B under visible light irradiation. Among the tested films, the BiOBr/PU-SF composite exhibited the highest removal rate of RhB at 98.9%, surpassing the removal rates of 93.7% for the BiOCl/PU-SF composite and 85.6% for the BiOI/PU-SF composite. Furthermore, an active species capture test indicated that superoxide radical (•O2-) and hole (h+) species played a predominant role in the photodegradation process.

Highly efficient Z scheme heterojunction of colloidal SnO2 quantum dots grafted g-C3N4 for the degradation of rhodamine B under visible light

The strategic design of the heterojunction photocatalyst with an enhancement in the charge transfer rate of photogenerated charge carriers plays a key role in wastewater treatment to remove organic pollutants. In the current study, the heterojunction of g-C3N4/SnO2 quantum dots (g-CN/c-SQDs) with different ratios of SQDs was prepared via sonochemical route. The Z scheme for the photocatalyst of g-CN/c-SQDs in visible light exhibits an exceptional degradation performance of RhB dye (98.25 % in 40 min) with cyclic stability. The enhancement of photocatalytic degradation efficiency is ascribed to efficient charge transfer and redox reactions due to the design of the heterojunction between high surface areas of g-C3N4 and c-SQD, which is evident from the results from photoluminescence spectra and scavenger experiments. The free radical capture experiments reveal the electron transfer pathway and the generation of reactive oxygen species (ROS) generation, including superoxide (•O2–) and hydroxyl (•OH) radicals has been involved in the photocatalytic degradation process. This study provides an insight of the construction of the Z- scheme heterojunction with an appropriate amount of semiconductor for an enhancement of photodegradation efficiency in wastewater treatment.

Enhanced photocatalytic degradation of rhodamine B dye (RhB), fluorescein dye (Flu), and their mixture using AgI/SnO2 photocatalyst

Enhanced photocatalytic degradation of rhodamine B dye (RhB), fluorescein dye (Flu), and their mixture using AgI/SnO2 photocatalyst

Enhanced photocatalytic activity of (In–Sr–P) tridoped TiO2/Bi2O3 composite loaded on mesoporous carbon: A facile sol-hydrothermal synthesis approach

Photocatalysis attracted attention as a promising technique for wastewater treatment, especially for water contaminated with organic pollutants such as dyes. However, designing a suitable photocatalyst with a simple procedure and high catalytic performance is still a big challenge for large-scale production. Here, indium-strantiom and phosphorous tridoped Bi2O3–TiO2 composite loaded on mesoporous carbon (ISP–TiO2/Bi2O3@C) was prepared via the sol-hydrothermal method. The as-prepared ISP-TiO2/Bi2O3@C displayed a mesoporous structure with a BET surface area of 84.804 m2 g−1. The photocatalytic activity of the ISP-TiO2/Bi2O3@C composite was investigated toward the degradation of rhodamine B (RB) under exposure to UV, and sunlight. It was found that ISP-TiO2/Bi2O3@C photocatalyst exhibited superior photocatalytic activity against photodegradation of RB under UV light and sunlight irradiation with a degradation percentage of 99.12, and 95.71 %, respectively. In addition, ISP-TiO2/Bi2O3@C composite displayed a distinguished recycling ability after the fifth recovery cycle, indicating a promising candidate for photocatalytic applications under UV light and sunlight. Consequentially, the higher photocatalytic activity of ISP-TiO2/Bi2O3@C under sunlight irradiation implies that the sol-hydrothermal method is promising for the preparation of efficient and low-cost TiO2-based photocatalysts for the photodegradation of various environmental pollutants.

Lamellar copper molybdate as a novel photocatalyst for the degradation of Rhodamine B

Water containing organic pollutants poses increasingly severe challenges to the clean water resources that humans rely on for survival. Photocatalysis is one of the technologies for removing organic pollutants from wastewater, which is green and has no secondary pollution. Here layered HCu1.5MoO5 photocatalyst is synthesized by wet chemistry. It is assembled from multiple stacked thin nanosheets with a thickness of ∼12.5 nm. The thin-layer structure of two-dimensional photocatalysts considerably reduces the migration distance of photo-generated charge carriers, thereby promoting efficient charge separation. In addition, it exhibits near-ultraviolet light response with the remarkable local surface plasmon resonance (LSPR) effect in the visible light region. The specific surface area and mesoporous structure of HCu1.5MoO5 are particularly advantageous for the mass transfer process of photocatalytic degradation. These characteristics enable it to effectively degrade Rhodamine B, achieving a degradation rate of 78.4 % after 120 min. The work provides a new perspective for the development of layered photocatalysts for photocatalytic degradation.

Efficient degradation of Rhodamine B by visible-light-driven biomimetic Fe(III) complex/peroxymonosulfate system: The key role of FeV=O

Advanced oxidation systems (AOS) hold promise for tackling refractory dyes in wastewater, yet the quest for efficient systems tailored to the degradation of dye remains a formidable hurdle. Here, a novel visible-light-driven AOS, consisting of biomimetic Fe(III) salen complex (FeL, salen= N, N-bis(salicylidene)ethylenediamine) and peroxymonosulfate (PMS), was proposed for highly efficient degradation of Rhodamine B (RhB), a model dye. The proposed AOS was capable of degrading 94.8 % RhB in 40 min, outperforming the typical Fe3+-based system, which achieved only 52.6 % pollutant degradation under identical conditions. As indicated by experimental results and theoretical calculations, the unique Fe-N2O2 coordination structure of FeL facilitated the adsorption of terminal O (O3) at PMS site, thereby enhancing the heterolysis of the O-O bond and generating high-valent iron-oxo species (i.e., FeⅤ=O) rather than radicals (SO4•−, HO•). The system demonstrated robust resistance to interference from environmental anions (Cl−, NO3−, HCO3−, SO42−), pH variations (initial pH 3.0–11.0) and humic acid. More attractively, it achieved 87.3 % chroma and 37.6 % chemical oxygen demand (COD) removal in real dye wastewater samples. This work may shed light on the understanding and development of biomimetic Fe complexes-based AOS for wastewater treatment.

Improved electro- and photo-catalytic performance of simplistically developed g-C3N4/rGO/TiO2 nanocomposite

Herein, we demonstrated the synthesis and analysis of the ternary heterojunction of g-C3N4, rGO, and TiO2. The product exhibits a remarkable improvement in OER performance and visible-light dye degradation of Rhodamine B (RhB). The nano/heterojunction nanocomposites are subjected to analysis of their morphological, optical, charge transport, and photocatalytic properties through the use of scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectra, and Photoluminescence. The investigation of dye degradation involves the examination of UV–visible absorption and related reaction mechanisms. The present study conducted a comparative analysis of the efficacy of TiO2, g-C3N4, and rGO, as well as their binary and ternary composites, in the OER and degradation of dyes. The photocatalytic performance of the synthesized ternary composite of g-C3N4/rGO/TiO2 is superior under visible light irradiation due to its efficient charge separation and transfer compared to that of the individual materials and binary composites of g-C3N4/rGO/TiO2. The dye degradation of up to 9.7 %, 39.6 % 57.8 %, 62.9 %, and 80.2 % was observed with 2 h of activity of TiO2, g-C3N4, g-C3N4/TiO2, g-C3N4/rGO, and g-C3N4/rGO/TiO2 respectively In addition, scavenging experiments were conducted to identify the reactive species, upon which a reaction mechanism is postulated.

A novel binary composite catalyst DiCoPc/BiOCl for synergistic photocatalytic degradation of dyes

A novel binary composite catalyst, DiCoPc/BiOCl, was produced through the hydrothermal method of loading DiCoPc onto BiOCl. The catalyst was then analyzed using X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). Photocatalytic degradation of Rhodamine B (RhB) dye pollutant was performed using the composite as a catalyst under visible light irradiation. Compared with DiCoPc and BiOCl, the composite of DiCoPc/BiOCl resulted in a significant enhancement of RhB's photocatalytic degradation, achieving a maximum degradation efficiency of 90.1 %. This is because, in the photocatalytic process, the loading of DiCoPc can expand the BiOCl's photoresponse range and enhance its light absorption performance. At the same time, the metal phthalocyanine can optimize the energy-level structure of the material and reduce the electron-hole recombination. Thus,the photocatalytic degradation of the composites was improved due to the synergistic effect of DiCoPc and BiOCl.

Isotype BiVO4 heterostructure and the effect of photo-sono induced electron-hole pair

Owing to its suitable energy band and strong catalytic capacity, BiVO4 has received extensive attention in photocatalysis. Here, we suggest a straightforward approach to address the challenges of insufficient compatibility, poor charge transport characteristics, and limited surface adsorption properties commonly found in traditional BiVO4 photocatalysts. A heterojunction BiVO4 structure is developed by incorporating two distinct crystal phases within a single semiconducting material. A facile hydrothermal procedure is used to synthesize distinct crystalline phases of BiVO4 photocatalysts, viz., tetragonal, monoclinic, and monoclinic/tetragonal heterophase. The physicochemical characteristics of the pristine and isotype BiVO4 heterojunctions were characterized using various techniques. The photocatalytic activity of BiVO4 samples was examined by monitoring the degradation of rhodamine B (RhB). In order to boost the degradation reaction, ultrasonic sound waves are employed within the reaction medium. The present study examined the photocatalytic, sonocatalytic, and sonophotocatalytic activity of BiVO4 microcrystals in relation to the degradation of RhB dye. The results show that the crystalline phases of BiVO4 samples significantly influence the behaviour of photo-sono-induced charges. An interface in the monoclinic/tetragonal heterophase creates a spatial environment that facilitates charge transfer and enhances the separation of photo-sono-induced electron-hole pairs. The paper extensively examines the correlation between the behaviour of photo-sono-induced charge carriers and the level of sonophotocatalytic activity. This would provide greater insight into the intrinsic reasons for the enhancement in sonophotocatalytic activity.

Ag3PO4/PtNPs-NaYF4:Yb,Tm, an up-conversion photocatalyst for enhanced degradation efficiency of pollutants in water

For developing and utilizing near-infrared (NIR) energy in sunlight, NaYF4:Yb,Tm (NYFYT) up-conversion luminescent powder was combined with Ag3PO4 (AP) and Ag3PO4/Pt nanoparticles (AP/PtNPs) as a photocatalyst. Driven by NIR light, NYFYT produces up-conversion emission at 348, 364, 453 and 478 nm, effectively stimulating the photocatalytic degradation performance of AP and AP/PtNPs. Under xenon lamp irradiation, the apparent rate constants (k) for Ag3PO4/Pt nanoparticles-NaYF4:Yb,Tm (AP/PtNPs-NYFYT) in photocatalytic degradation of rhodamine B (Rh B) and phenol are 5.51 and 12.82 times higher than those of AP and 1.90 and 2.37 times higher than those of AP-NYFYT-50 wt%, respectively. In addition, under 980 nm laser irradiation, rate constants are 3.26 and 4.16 times higher than those of AP-NYFYT-50 wt%, respectively. These results indicate that the combination of NYFYT and AP expands the absorption range of the composite photocatalyst and facilitates the NIR-driven photocatalytic process. The introduction of PtNPs effectively prevents the electron-hole recombination and the reduction of Ag+, accelerating the redox reaction and promoting the photocatalytic activity and stability of AP.

Construction of novel S-defects rich ZnCdS nanoparticles for synergistic visible light assisted photocatalytic degradation of rhodamine B: Insights into mechanism, pathway and by-products toxicity evaluation

The contamination of wastewater by azo dyes indicates serious environmental risks. Currently, industries worldwide use approximately 700,000 tons of these dyes annually, making their removal a significant challenge. In photocatalysis research, a prominent area of dedication to the advancement of visible light photocatalysis aims to achieve superior performance in overall activity. In this study, we fabricated ZnCdS nanoparticles (NPs) via a simple co-precipitation strategy, and sulphur (S)-defect-rich ZnCdS NPs (D-ZnCdS) were created through the ball milling method. These S-defect nanoparticle (NPs) catalysts were utilized for rhodamine B (RhB) dye photocatalytic degradation experiment. (XRD) X-ray diffractometer, X-ray photoelectron spectroscopy (XPS), surface-enhanced Raman spectroscopy, and photoluminescence (PL) spectroscopy characterization studies explained the induced S-defect rich in D-ZnCdS NPs. Further, the morphological, band gap determination, and photogenerated charge carrier recombination efficiency were studied using different analytical and spectroscopic characterization techniques. The Brunauer-emmett-teller (BET) results indicate the increased surface area of D-ZnCdS NPs thereby providing more active sites. The photocatalytic degrading efficiency of D-ZnCdS over RhB explains the complete degradation of pollutants within 260 min. This enhancement in the catalytic process is attributed to the increased absorption of photon energy from the visible light and large defect-rich active sites. Further, the involvement of hydroxyl (*OH) and superoxide radicals (O2*-) in the degradation of RhB along with the presence of sulphur defects, significantly improves the charge transfer in ZnCdS NPs. The involvement of certain factors like pH, ions, NCs catalyst and different RhB concentrations on RhB degradation was investigated. Additionally, D-ZnCdS NPs showed stable degrading capability even after six consecutive cycles of catalytic RhB degradation. The by products formed during the RhB photodegradation experiment were identified using Gas chromatography-mass spectrometer (GC-MS) analysis, and toxicity in fish, daphnia, and algae was examined using the Ecological structure-activity relationships (ECOSAR) program. From the above findings, the current research work provides a new strategy for utilizing defect-engineered D-ZnCdS NPs as a promising catalyst for various environmental remediation applications and paves a ways for manufacturing innovation.

Sn-MOF and Sn-MOF@Fe3O4 composites for highly efficient photocatalytic degradation of rhodamine B

In this paper, 5,10,15,20-tetrakis-(4-carboxyphenyl)porphyrin (TCPP) was used as the ligand, and metal Sn and Fe were used as the nodes to construct metal–organic framework (MOF) materials Sn-MOF and Sn-MOF@Fe3O4 with a three-dimensional structure. Both Sn-MOF and Sn-MOF@Fe3O4 were utilized for photocatalytic degradation of rhodamine B (Rh B) dye. The effects of catalyst dosage, initial pH of the reaction solution and H2O2 on the degradation of Rh B in water under different environments were investigated. The main active species during the photocatalytic reaction were identified by capture experiments. The results showed that Sn-MOF@Fe3O4 could effectively inhibit the complexation of electrons and holes, and exhibited high catalytic activity for Rh B at a catalyst concentration of 0.25 g/L and pH 3. The degradation efficiency reached 100 % after UV–Vis irradiation for 20 min and the performance of Sn-MOF@Fe3O4 for photocatalytic degradation of Rh B was superior to other photocatalysts.

The piezoelectric catalysis effect of tourmalines in the degradation of organic pollutants

The discovery of the piezoelectricity of tourmalines has been reported over three decades, but very few studies exploring the piezoelectric catalysis effect of tourmalines. Herein, the piezoelectric catalysis effect of iron-based and lithium-based tourmalines (Fe-TM and Li-TM) was studied through the degradation of Rhodamine B (RhB) and p-nitrophenol (PNP) in aqueous solution as model reaction in tourmaline/ultrasound system. In ultrasonic condition, the obvious degradation of RhB and PNP was observed and confirmed stemming from the piezoelectric catalysis effect of Fe-TM and Li-TM. Fe-TM was found to have higher surface voltage (560–590 mV) and a higher piezoelectric coefficient of 9.5 pC/N, compared to Li-TM (surface voltage: 410–450 mV; piezoelectric coefficient: 6.7 pC/N). Accordingly, high and stable piezoelectric catalysis activity was observed on Fe-TM in the degradation of RhB and PNP. Through annealing at 800 ℃ in air, Fe-TM can be converted from buergerite tourmaline into foitite tourmaline, and the piezoelectric catalysis activity was basically unchanged. In tourmaline/ultrasound system, the degradation of RhB and PNP was mainly initiated by •OH that be produced from the oxidation of water with the piezoelectric potential of tourmalines. The present work observes and confirms the piezoelectric catalysis effect of tourmalines, which could inspire the new applications and understanding of tourmalines.