Immersion In Acid Solution Research Articles

Self-cleaning and anti-corrosion superhydrophobic coatings of PA-TiO2@SiO2 copolymerized hetero compound

Inspired by leaf lotus effect, superhydrophobic surfaces have developed rapidly in recent years. In this paper, anatase nano TiO2 with particles size of about 70 nm was successfully loaded on the surface of SiO2 by sol-gel method. SiO2 and TiO2 were chemically bonded by Ti-O-Si and constructed a certain micro- and nano-composite structure. After superhydrophobic composite PA-TiO2@SiO2 was obtained by copolymerizing with acrylate and other monomers. The coating was prepared by drop coating plus spraying coating on glass substrates with water contact angles >160° and excellent self-cleaning properties, which could maintain the performance of the superhydrophobic coating by immersion in acidic solutions or water for 2 days. Meanwhile, the coating on the surface of the glass plate at −20 °C significantly delayed the freezing time of the ice. The rough structure of the surface and the presence of fluorine-containing hydrophobic groups gave the superhydrophobic coating an advantage over acrylate polymers in reducing the corrosion rate of steel surfaces.

Utilization of all components of waste concrete: Recycled aggregate strengthening, recycled fine powder activity, composite recycled concrete and life cycle assessment

Waste concrete can be crushed to produce a large amount of recycled aggregate(RA) and recycled fine powder(RFP). Different recycled components have different characteristics. RA should focus on its pretreatment method, while RFP should focus on its morphology and volcanic ash activity. This study investigated the effects of two single and composite strengthening methods in RA, mechanical vibration and acid solution immersion. The results showed that the composite strengthening method was more effective in improving the properties of RA, which resulted in an increase in apparent density and bulk density by 5.59 % and 12.55 %, respectively, and a decrease in crush value and water absorption by 26.05 % and 15.52 %, respectively. Three methods were used to analyze the volcanic ash activity of RFP with different particle sizes, and the RFP with a particle size of 23.08 μm has a high volcanic ash activity, which can effectively play its role of filling and volcanic ash activity in recycled concrete. Based on the preferred pre-treated RA and RFP, the effect of RA and RFP on the macroscopic and microscopic properties of recycled concrete under different mixing amounts was studied, and the results showed that the compressive strength of 20 % RA single mixing could reach 40.17 MPa, and that the compressive strength of 20 % RFP single mixing could reach 38.6 MPa, and both of them had no significant effect on the frost resistance. Further, 20 % RA and 20 % RFP were compounded to prepare recycled concrete, and the results showed that the compressive strength of RA-RFP was slightly improved to 40.12 MPa, and the mechanism of its action was explained by microscopic analysis. Finally, the environmental impact and carbon emission reduction of the life cycle of RA and RFP were evaluated, and the results showed that the utilization of recycled materials can play an effective environmental benefit.

Quantitative characterization of constitutive model of mudstone under uniaxial loading after immersion in acid solution by infrared radiation

The fracturing of coal and rock is a fundamental cause of mine disasters, such as coal pillar instability,water inrush and rock failure. To prevent the occurrences of these failures, it is important to accurately monitor and detect stress fractures in coal and rock. Furthermore, it is also essential to develop stress–strain constitutive models for an accurate and effective monitoring, early warning of coal and rock stress fracture process. The development of stress–strain constitutive model is the important basis for effectively realizing water conservation mining and rock strata control in mines. In this research, mudstone samples were collected from coal mining sites and mining faces. The mudstone samples were subjected to chemical corrosion using both strong acid and neutral solutions, followed by conducting infrared radiation observation experiments during uniaxial loading. The research findings revealed that 1) strong acid can promote the infrared radiation of the mudstone surface. The Average Infrared Radiation Temperature (AIRT) value of the mudstone corroded by the solution with pH 1.3 during uniaxial loading fracture is changed and noted 6.71 times to the solution with pH 7.3. 2) strong acid has an significant impact on the failure of mudstone samples. The mudstone corroded by the solution with pH 1.3 is mainly damaged by tension and shear composite cracks, while the mudstone corroded by the solution with pH 7.3 is primarily damaged by tension cracks. 3) A nearly linear relationship between the strain of mudstone during uniaxial loading and AIRT was found. This relationship defines a new index of deformation infrared radiation coefficient, allowing for the quantitative characterization between strain and infrared radiation. 4) A one-dimensional statistical damage constitutive model based on AIRT is established using Weibull distribution, while considering the stress–strain compaction stage. This model effectively predicts the stress of mudstone during uniaxial loading. The research results lay a theoretical and practical foundation for the monitoring and evaluation of rock stability in underground engineering such as coal mines, subways and tunnels.

Performance evaluation of loadbearing compressed fully recycled aggregate concrete bricks

Due to rapid expansion of infrastructure around the world, many countries are facing severe shortage of natural resources. Further, environmental issues originating from Construction and Demolition (C&D) waste are becoming a concern for society. Recycling of C&D waste is one of the most viable options that can help to reduce the burden on natural resources as well as provide an eco-friendly and sustainable solution. Recycled Concrete Aggregates (RCAs) obtained by recycling of C&D waste have been used in the production of Recycled Aggregate Concrete (RAC). In this study, the effect of RCAs on compressive strength and durability performance of loadbearing concrete bricks manufactured by Compression Casting Technique (CCT) is investigated. The concrete bricks were prepared using different mixes containing 100% RCAs using ratios of coarse-to-fine aggregates i.e., 60:40 and 70:30. For comparison, Natural Aggregates Concrete (NAC) and burnt-clay bricks were also tested. They were tested in compression and durability tests such as water absorption (WA), cycling ponding test in acidic and brine solution, efflorescence and drying shrinkage were conducted. The results showed that RAC bricks satisfied the density, WA and compressive strength requirements specified in ASTM standards. Compared to burnt-clay bricks, density and compressive strength of RAC bricks were higher (20.7–30.5% & 11.2–25.2%, respectively) while WA was less (34.4–68.5%). The RAC bricks performed better than NAC under 5% sulfuric acid and supersaturated brine solutions. The drop in compressive strength for RAC bricks after 4 cycles of immersion in acidic solution for 28 days was negligible. An increase of 21% in compressive strength of RAC bricks with 60:40 ratio of RCAs, and 10% cement was achieved after 4 cycles of immersion in the supersaturated brine solution for 56 days. The RAC bricks were more susceptible to drying shrinkage due to their porous nature. No efflorescence problem was observed in both RAC and NAC bricks. This study concluded that masonry units made using 100% RCAs fulfill performance criteria specified in international standards are structurally viable and are an eco-friendly solution. The commercial use of RAC bricks will have a significant positive impact on the environment and ensure sustainable development in construction industry.

Acid resistance and failure mechanism of zinc-rich primer/micaceous iron oxide/polyurethane composite coating immersed in 5 wt% sulfuric acid

In order to study the reliable resistance to sulfuric acid corrosion of epoxy zinc rich primer/micairon oxide intermediate paint/acrylic polyurethane topcoat composite coatings for power transmission and transformation equipment. In this paper, under the condition of immersion in 5 wt% sulfuric acid, the sulfuric acid resistance behaviour of zinc-rich epoxy/micaceous iron oxide/polyurethane composite coating was evaluated by performing soaking tests for 50 h, 100 h and 150 h, and the failure mechanism of the film was studied. The changes in the surface properties of the coating during sulfuric acid soaking were evaluated by testing the hardness, glossiness and adhesion, and the changes in the capacitance and resistance characteristics of the coating during acid soaking were studied by Electrochemical Impedance Spectroscopy (EIS). The micromorphology and chemical element distribution of the cross-section of the composite coatings were studied by Scanning electron microscope (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The functional group changes were studied by Fourier transform infrared spectroscopy (FT-IR). The results show that the corrosive effect of sulfuric acid solution immersion on acrylic polyurethane is weak, while the hydrolysis of water molecules will lead to aging and failure of acrylic polyurethane. Sulfuric acid leads to the formation of zinc deficient areas in zinc-rich primers, which reduces the cathodic protection effect of zinc-rich primers. The service life of the zinc-rich primer/ Micaceous Iron Oxide/acrylic polyurethane composite coating is less than 150 h.

Effect of acid solution on some Physical and Mechanical Properties of (Epoxy/polysulphide) Blends

The aim of present investigation is to evaluate the mechanical properties , (tensile, impact, and hardness) properties and physical properties. Acid absorption for (epoxy/polysulphide) specimens were prepared by open molding technique , with different ratios (95-5),(90-10),(85-15), and (80-20)% weight ratio.
 Impact strength (Charpy method) using showed a better value for (85-15)% ratio, so toughness increased and this optimum mixing ratio (OMR) was taken for tensile and hardness test before and after immersion in acid solution with different concentrations (0.1 N, 0.2 N, & 0.3 N) to evaluate tensile strength and Shore hardness D , 0.3 N had been affected all specimens more than (0.1 & 0.2)N, in each test Diffusion coefficient was calculated for each concentration.

Acid resistance of alkali-activated composites containing waste glass as fine aggregate

This study examined the efficacy of waste glass cullet (WGC) as a substitute for natural fine aggregate in alkali-activated composites when exposed to sulfuric acid and hydrochloric acid solutions for 1 year. The physical appearance, surface alkalinity, mass, mechanical strength and microstructure of hardened samples before and after immersion in acid solutions were investigated. The findings this work indicated that physical, mechanical and microstructural damage of the specimens due to acid attack increased with an increase in the percentage of WGC. This was attributed to the smooth surface texture and angularity of the WGC, which affected the bond with the damaged paste matrix at the interfacial transition zone and increased the porosity. However, the acid resistance of the mortars containing up to 50% WGC was found to be satisfactory when compared with the mortar without WGC. Therefore, the use of WGC as a partial replacement (up to 50%) for natural sand is feasible for alkali-activated systems under acid exposure.

Durability Test and Mechanical Properties of CFRP Bolt under Accelerated Corrosion Conditions

In order to study the influence of acid corrosion on the quality, elastic modulus, tensile strength, elongation, and other properties of epoxy mortar test block and CFRP bolt, the durability test and mechanical properties test of CFRP bolt under accelerated corrosion conditions were proposed. An epoxy mortar test block was soaked in acidic solution for 90 d, and the quality, elastic modulus, tensile strength, elongation, and other properties of CFRP bolt were analyzed. Through the analysis of test data, the load-slip relationship curve of bolt was obtained and the Arrhenius equation was used. The relationship curve between tensile strength retention and logarithm of time in test environment was obtained, and the concept of conversion factor TSF was introduced to predict the strength retention of anchor corroded by acid rain for 20 years in service. The experimental results show that the maximum loss rates of mass, elastic modulus, and compressive strength of epoxy mortar test block are 1.98%, 2.81%, and 11.25%, respectively, during 90 d immersion in acidic solution. The maximum loss rates of mass, elastic modulus, tensile strength, and elongation of CFRP bolt are 0.65%, 3.29%, 6.51%, and 5.06%, respectively. Based on the analysis of the test data, the load-slip curve of the bolt is obtained, which indicates that acid corrosion reduces the bond performance of CFRP bolt. The bond-slip curve of bolt after 90 d acid corrosion was obtained by further analysis of experimental data. Conclusion. The experiment has certain engineering application values.

Waste Skin of Hawaiian Ladyfish (Elops hawaiensis) Utilization as Gelatin Raw Material With Immersion Solution Combination

Bontot from Domas Village, Pontang District, Serang Regency is a fish jelly product. The manufacture of Bontot produces fish skin waste with a percentage of 10% of the whole weight of the fish. This waste can be reduced by applying the concept of zero waste in the processing of bontot which is reused as a raw material in the manufacture of gelatin. This research aims to determine the best NaOH concentration in the manufacture of gelatin from the skin of Hawaiian ladyfish ( Elops hawaiensis ) and to determine the effect of NaOH immersion on the organoleptic, chemical, and physical qualities of the gelatin. This study used an alkaline solution (NaOH) with a concentration of 0.1%; 0.3%; and 0.5%, which is then followed by a 6% acid solution immersion process. The production of gelatin from the skin of Hawaiian ladyfish was carried out using a one-factor completely randomized design (CRD) with 2 replications (duplo) accompanied by non-parametric analysis which was carried out for organoleptic testing with a hedonic scale using the Kruskal Wallis test. The results showed that the best combination was 0.1% NaOH and 6% HCl with a hedonic value of 3.7 with a whitish-yellow color; odor hedonic value 3.13; 11% yield; gel strength 280.43 g bloom; viscosity 36.95 cP; water content 8.75%; ash content 0.58%; and a pH value of 6.88

PENGARUH KARAT TERHADAP KETANGGUHAN MARETIAL BAJA UNTUK JEMBATAN

Rust is a major problem in steel bridge construction because it has the potential to affect the integrity of the structure and is also an important consideration for inspection and maintenance programs. This study shows the results of laboratory tests on the effect of rust within 1 to 9 weeks on fracture toughness as one of the important mechanical properties of steel bridge elements. The specimens in this study were made of SM 490 type, steel commonly used for bridge construction. Rustless and rusted specimens were used with varying degrees of exposure after immersion in acid solution to simulate the rate of rust. The effect of rust rate on fracture toughness due to mass loss was studied. The fracture toughness of each specimen was monitored for those specimens with exposure periods of 1 week, 2 weeks, 3 weeks, 4 weeks, and 9 weeks to test their effect on toughness. The results of this study showed that there was no significant reduction in the rusting duration of 1 week, 2 weeks, 3 weeks, 4 weeks, and 9 weeks of fracture toughness. Rusting and testing activity for the long term is still ongoing and will be continued, as the results of this study greatly help bridge designers and asset managers to better model rust inspection and maintenance plans and assess the structural integrity of steel bridges affected by rust more accurately.

Sustainable use of waste glass in alkali activated materials against H2SO4 and HCl acid attacks

This study examined the effect of using waste glass powder (GP) as a partial precursor in alkali activated mortars exposed to H2SO4 and HCl acid solutions for one year. The changes in physical appearance, surface alkalinity, mass, compressive strength and microstructure of the hardened samples after immersion in acid solutions were evaluated. The findings of the test program revealed that the inclusion of 10%–20% GP as a replacement of fly ash (FA) substantially reduced the physical, mechanical and microstructural damages of the specimens due to acid attack. This is attributed to the additional Si, Na and Ca ions provided by GP that enhanced the formation of reaction products and introduced a dense microstructure with reduced porosity. However, the use of GP content beyond 20% increase the availability of free Ca and porosity that led to considerable deterioration when exposed to the acid solutions.

Durability evaluation of mechanical and bonding properties of polyurethane-modified waterborne epoxy resin for road

ABSTRACT To further improve the application quality of the waterborne epoxy resin (WER) in road engineering, a variety of WER and polyurethane-modified WER were prepared. The WER was treated by acid solution immersion, alkali solution immersion, salt solution immersion, oil immersion or artificial-accelerated aging. The mechanical properties of the WER before and after the treatment by various methods were tested. Based on the ideal point method of entropy weight, the influence degree of each treatment method on the mechanical properties of the WER was analysed, and the mechanical properties decay and residual mechanical properties of the WER were evaluated. The bonding durability of the WER was analysed. The results show that after the xenon lamp aging treatment, the mechanical properties of the WER decreased most significantly. The mechanical durability of the WER modified by polyurethane is improved to a certain extent, and the retention rates of their mechanical properties are >85%. After treatment by various corrosion or aging methods, the retention rates of mechanical properties of the PUE-E44 WER are >89.29%, showing an improved corrosion and aging resistance. The residual mechanical and bonding properties of the PUD-E51 WER are at a high level, and still show improved mechanical and bonding properties.

Low-Temperature Co-hydroxylated Cu/SiO2 Hybrid Bonding Strategy for a Memory-Centric Chip Architecture.

Cu/SiO2 hybrid bonding with planarized dielectric and isolated metal connections can realize ultradense interconnects (e.g., ≤1 μm) by eliminating the microbumps and underfill through the direct bonding of Cu-Cu and SiO2-SiO2. However, the low-temperature bonding of Cu-Cu (oxide-free surface) and SiO2-SiO2 (hydroxylated surface) is difficult to be compatible in a mechanism. We circumvent this contradiction by constructing a co-hydroxylated functional surface on a Cu/SiO2 hybrid platform. By combining and optimizing the protocol of Ar/O2 plasma activation and formic acid solution immersion, an -OH active layer was successfully established on the Cu and SiO2 surfaces simultaneously, and the increased total surface area provided more adsorption sites for hydroxyl groups. A Cu-Cu interface with sufficient atom diffusion, substantial grain growth, and fewer microvoids was obtained at 200 °C. Notably, the carbon-related interlayer that may degrade the interfacial performance could be effectively inhibited across the optimized SiO2-SiO2 interface even if organic acid was introduced in the protocol. This low-temperature Cu/SiO2 hybrid bonding via a co-hydroxylated strategy may inspire the development of a memory-centric chip architecture and functional integrated circuits delivering a monolithic-like performance in the future hyperscaling era.

In Vitro Effect of Acidic Solutions and Sodium Fluoride on Surface Roughness of Two Types of CAD-CAM Dental Ceramics.

Objectives This study assessed the effect of immersion in acidic solutions and sodium fluoride on surface roughness of dental ceramics. Materials and Methods 40 blocks of Vitablocs Mark II and IPS e.max CAD (5 × 5 × 3) were prepared. The samples were divided into five groups (n = 8) for immersion in artificial saliva (control), artificially prepared gastric acid, acetic acid, 0.02% sodium fluoride + gastric acid, and 0.02% sodium fluoride + acetic acid. The samples were immersed for 168 hours in the respective solutions except for sodium fluoride, in which the samples were immersed for 69 hours. The surface roughness of samples was measured before and after immersion using a profilometer. The surface roughness changes of three specimens of each group were evaluated by scanning electron microscopy (SEM). Data were analyzed using one-way and two-way ANOVA, Tukey's test, and independent t-test. Results Significant changes were noted in Ra (P=0.002) and Rq (P < 0.0001) in both types of ceramics. The lowest changes in Ra and Rq parameters were seen in artificial saliva and gastric acid and highest changes occurred following immersion in 0.02% sodium fluoride + acetic acid and 0.02% sodium fluoride + gastric acid, respectively. Changes in Rz were also significant following immersion in Vitablocs Mark II (P < 0.05). Immersion in 0.02% sodium fluoride + gastric acid and 0.02% sodium fluoride + acetic acid produced a rougher surface on both types of ceramics (SEM). Conclusion Exposure of Vitablocs Mark II CAD and IPS e.max CAD to 0.02% sodium fluoride + gastric acid and 0.02% sodium fluoride + acetic acid significantly increased their surface roughness, while for Vitablocs Mark II, lager defects were seen on its surface.

Pengaruh Lama Perendaman dan Suhu Larutan Jeruk Nipis Terhadap Kadar Kalsium Oksalat Pada Umbi Porang

Degenerative disease is a disease caused by a decrease in the condition of the human body. Degenerative diseases can be prevented with a healthy lifestyle, one of them is consuming foods with high fiber. One of the high-fiber foods that are being developed at this time is the porang tuber. Glucomannan, which is mostly contained in porang tubers, is a polysaccharide that is easily soluble in water and high in fiber. Besides containing glucomannan, porang tubers also contain lots of calcium oxalate which can cause irritation to the tongue and mouth when consuming it. Calcium oxalate levels can be lowered through immersion in acidic solution. Solution that can be used to reduce calcium oxalate levels in porang tubers is lime. Soaking time is one of the factors that affect the reduction of calcium oxalate levels. Porang tubers that have been immersed in 5% lime solution for 60 minutes showed the highest decrease, namely 31.79%. In addition, soaking at high temperatures can decrease calcium oxalate levels in porang tubers also. Porang tubers that have been immersed in a 5% lime solution at 60 ° C, the calcium oxalate level has decreased to 49.58%.

The Determination of a Damage Model for Mudstone under Uniaxial Loading in Acidic Conditions

The influence of acid solutions was investigated on the mechanical properties of mudstone. Uniaxial compression tests on mudstone samples were conducted to determine the variations of relative mass, porosity, deformation, and strength characteristics of mudstone subjected to acidic solutions with different pH values. The change of pH, relative mass, and porosity of mudstone in the process of acid solution immersion was monitored during soaking. The mechanism of hydrochemical corrosion of mudstone samples was preliminarily discussed. The damage parameter was introduced based on the porosity rate. The results show that with increased solution acidity, the peak stress and elastic modulus decreased to different levels, while the peak strain increases in the rock samples. The increased chemical damage parameters reduce the mechanical parameters and increased the deformation parameters. On the basis of the mechanical test, considering the stress-strain relationship of rock in the compaction stage, a segmented damage constitutive model of rock based on chemical damage parameters is established, and the test results are verified. The results show that the correlation coefficient between the theoretical curve and the experimental data is as high as 0.98, and the model is suitable for the analysis of chemically corroded rock under the uniaxial compression test. The results provide a reference for the analysis and design of coal-bed methane wells where the rocks frequently become acidic during the production of methane.

One-Step Fabrication of Fluorine-Doped Graphite Derived from a Low-Grade Microcrystalline Graphite Ore for Potassium-Ion Batteries

Graphite has been considered as a promising anode material of potassium-ion batteries (KIBs), the practical applications of which are impeded because of the unsatisfactory cycling stability and poor rate capability. In this study, the favorable effect of fluorine-doping on the K-storage performance of graphite is demonstrated. For a more practical application, a low-grade microcrystalline graphite (MG) ore is chosen as the raw material and is purified through a facile hydrofluoric acid solution immersion method. The results indicate that the mild purification process not only results in a high purity of 98.59 wt % for MG but also realizes the effective F-corporation in the graphite host. The fluorine content of 1.02% with a high semi-ionic bond constituent (70.53%) enlarges the graphite interlayer distance from 3.356 to 3.461 Å, which contributes to an alleviated volume change and faster K-ion diffusion kinetics. Benefiting from the F-doping-induced structural improvement, the modified MG electrode exhibits a prominently elevated reversible capacity (320 mA h g–1), a superior cycling ability with a high capacity retention of 74.6% after 100 cycles, and an enhanced rate performance. This study manifests that F-doping is a feasible route to resolve the obstacles of graphite materials and paves the way for commercial KIBs with high performance.

Utilization of Silica from Indonesian Solid Wastes as Catalyst Materials

Synthesizing materials can be attempted by utilizing alternative sources such as wastes or disposed/by-products of certain activities. In this article, exploration of silica from agricultural waste and from geothermal sludgefor production of silica catalysts, are presented. The first silica catalyst was synthesized from rice husk. The husk was initially heated until silica ashes could be formed. After immersion in acidic solution, impregnation with nickel and molybdenum were conducted to introduce active metal of nickel (Ni) and molybdenum (Mo) in the support structure. The catalyst formed, Ni-Mo/SiO2 was applied to convert crude palm oil into biofuels. The other silica catalyst was obtained from geothermal sludge. After washing, the catalyst was soaked in sulphuric acid solution to form acidic silica solid catalyst. The catalyst was applied in hydrolysis of seaweed-industry solid waste to produce glucose. The catalyst was relatively successful to facilitate 19-20% glucose yield, or up to 21% glucose selectivity from waste material.

Trazodone as an efficient corrosion inhibitor for carbon steel in acidic and neutral chloride-containing media: Facile synthesis, experimental and theoretical evaluations

Trazodone (TDO, 2-(3-(4-(3-chlorophenyl)piperazin-1-yl)propyl)-[1,2,4]triazolo-[4,3-a]pyridin-3(2H)-one) was synthesized via a facile strategy without using acid-removing agent of strong activity, and its structure was confirmed by nuclear magnetic resonance and Fourier transform infrared spectroscopy. The efficient corrosion inhibition of protonated and neutral TDO for 20# carbon steel (C-steel) in the respective acidic and neutral chloride-containing solutions was verified by gravimetric, electrochemical measurements and surface analyses. The inhibition efficiency of TDO for C-steel in 3.5% NaCl solution was moderately higher than that in 0.5 M HCl medium, reaching 93.1% at 298 K with 8 mM concentration. TDO simultaneously inhibited anodic and cathodic reactions with dominantly anodic effect, and prominently elevated interfacial polarization resistance for C-steel in both media. Morphology observations indicated that the appearance of C-steel was improved with reduced surface roughness due to TDO adsorption. The existence of cationic TDO caused by protonation was confirmed in the adsorption layer after immersion in acidic solution by X-ray photoelectron spectroscopy. Adsorption of TDO on C-steel surface in both solutions conformed to Langmuir isotherm. Quantum chemical calculations under dominant solvent model and molecular dynamics simulations were also performed, the outcomes of which were in good correlation with experimental results.

Preparation and Photocatalytic Properties of Ceramic Nanocomposites Added Zinc Sulfide Nanoparticles

We fabricated ceramic ZnS nanocomposites by mixing fly ash of a thermal power plant and waste glass powder with ZnS nanoparticles manufactured by a template-free hydrothermal treatment method. Ceramic ZnS nanocomposites with structure and mechanical properties produced using powder mixtures were obtained by applying milling and annealing procedures at a heat treatment temperature of 700 °C. Its photocatalytic activity was evaluated with methyl orange (MO), acetaldehyde (ATA), 2,4-dichlorophenoxyacetic acid (2,4-D), and methylene blue (MB) as photodegradation targets. Crystallization behavior of ceramic ZnS nanocomposites prepared in this study was examined through X-ray diffraction (XRD) analysis and surface morphological observation. Chemical composition of the ceramic ZnS nanocomposites was estimated using field emission-scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectrometry (EDS). Its physicochemical properties were characterized by measuring density, compressive strength, bending strength, and chemical durability according to ZnS nanoparticle content. Results confirmed that addition of ZnS nanoparticles significantly improved physicochemical properties of the prepared nanocomposite samples. As the content of ZnS nanoparticles increased, photocatalytic activity of ceramic ZnS nanocomposites with and without acid treatment for photodegradation target material also increased under UV light irradiation. Degrees of photocatalytic degradation of MO, ATA, 2,4-D, and MB by ceramic ZnS nanocomposites added with 20 wt% ZnS nanoparticles (after immersion in acidic solution) were about 0.285, 0.118, 0.280, 0.256 after UV irradiation for 180 min, respectively. Moreover, the photocatalytic degradation rate of target substances for photodegradation was estimated using pseudo-first-order kinetics proposed by Lagergren.