Photocatalytic Removal of Toxic Hg(II) Ions Using TiO2-Modified Bamboo Charcoal as Photocatalyst

2012 ◽  
Vol 550-553 ◽  
pp. 2182-2185
Author(s):  
Chang Bin Xia ◽  
Chun Hua Liu ◽  
Zhi Hua Liu ◽  
Dao Xin Wu
Keyword(s):  
Wastewater Treatment ◽  
Adsorption Capacity ◽  
Uv Irradiation ◽  
Industrial Wastewater ◽  
Sol Gel ◽  
Bamboo Charcoal ◽  
Optimum Amount ◽  
Illumination Time ◽  
Photocatalytic Removal ◽  
Addition Amount

Photocatalytic removal of mercury was studied using TiO2-modified bamboo charcoal prepared with Sol-Gel method as photocatalyst, and formate as hole scavengers under UV irradiation. In the absence of formate additives, approximately 95% of 30 mg/L Hg(II) ions was found to be removed from the solution by adsorption. Addition of formate resulted in the photoreduction of Hg(II) to its metallic form. The best conditions of Hg(II)-containing wastewater treatment were determined. The results show that the optimum amount of photocatalyst was 4 g/L,the optimum illumination time was 30 min,reached a plateau value at pH 6, the photocatalyst calcinated for 2h at 500°C. and the optimum formate addition amount was found to be 120mg/L, which doubled the adsorption capacity. Accordingly, it is believed that the method developed in this study is effective and practical in industrial wastewater treatment for Hg(II) disposal.

Photocatalytic Removal of Phenol Under UV Irradiation on WO x –TiO2 Prepared by Sol–Gel Method

2008 ◽  
Vol 128 (1-2) ◽  
pp. 190-196 ◽  
Author(s):  
M. Piszcz ◽  
B. Tryba ◽  
B. Grzmil ◽  
A. W. Morawski
Keyword(s):  
Uv Irradiation ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Photocatalytic Removal

Photocatalytic Removal of Cu(II) Ions from Water Using TiO2-Modified Bamboo Charcoal

2012 ◽  
Vol 557-559 ◽  
pp. 1057-1061
Author(s):  
Chang Bin Xia ◽  
Chun Hua Liu ◽  
Dao Xin Wu
Keyword(s):  
Reaction Time ◽  
Degradation Rate ◽  
Removal Rate ◽  
Waste Water Treatment ◽  
Sol Gel ◽  
Bamboo Charcoal ◽  
Photocatalytic Removal ◽  
Roasting Temperature ◽  
Catalyst Dosage ◽  
Solution Acidity

The photocatalytic reduction of Cu(II) under UV irradiation in presence of citric acid (CA) as acrificial agent has been investigated using TiO2-modified bamboo charcoal as photocatalysts prepared with Sol-Gel method. The influence of the catalyst dosage, Cu(II) of the initial quality concentration, photocatalytic time, catalyst roasting temperature and the solution acidity to Cu(II) removal rate has been explored. The best conditions of Cu(II)-containing waste water treatment were determined.The results show that the effect is the optimum when the pH is 7.0, the photocatalytic reaction time is more than 60min, the usage amount of catalyst is 8 g/L and the photocatalyst is calcinated for 2h at 500°C.The degradation rate of Cu(II) ion can be improved using appropriate extension reaction time method.

scholarly journals The Effect of Sol-Gel Coatings on the Phosphorus (P) Adsorption Capacity of Calcareous Materials for Use in Water Treatment

Water ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 3
Author(s):  
Solvei Mundbjerg Jensen ◽  
Helmer Søhoel ◽  
Frances Helen Blaikie ◽  
Hans Brix ◽  
Carlos A. Arias
Keyword(s):  
Wastewater Treatment ◽  
Adsorption Capacity ◽  
Sol Gel ◽  
Principal Component ◽  
Maximum Adsorption Capacity ◽  
P Adsorption ◽  
Decentralized Wastewater Treatment ◽  
Coated Materials ◽  
Wastewater Treatment Systems ◽  
P Removal

(1) Phosphorus (P) removal has proven difficult in decentralized wastewater treatment systems, and P binding material, installed as an external filter, has been proposed for improving P removal. Especially, calcium (Ca)-rich materials have shown promising results. (2) Five calcareous materials were tested with isotherm batch experiments. The material with the highest P adsorption capacity was selected to undergo different Sol-Gel coatings, i.e., different coating dilution ratios (1:10, 1:5, and 1:1) and exposure periods (5, 10, and 15 min). The seven coated materials were evaluated by isotherm experiments. (3) The maximum adsorption capacity (Qmax) was determined by fitting the Langmuir equation. Qmax for the non-coated materials, and ranged from 0.7 (sand) to 35.1 (Catsan) mg P g−1 DW, while the coated materials ranged from 7.8 to 24.7 mg P g−1 DW depending on the coating. Based on the rotated Principal Component Analysis, the most important parameters for Qmax were the texture and the Ca content. (4) Catsan was the most promising material, but when performing a Sol-Gel coating, a trade-off between preserving Qmax and the coating thickness were evident, as the materials with the thinner coating preserved more of the sorption capacity. The development of P binding materials constitutes a useful technology in decentralized wastewater treatment systems.

scholarly journals Removal of styrene by the synthesized ZnO nanoparticles coated on the activated carbon adsorbent in the presence of UV irradiation

2019 ◽  
Vol 6 (4) ◽  
pp. 225-232
Author(s):  
Mojtaba Nakhaei Pour ◽  
Hossein Ali Rangkooy ◽  
Fereshteh Jahani ◽  
Ameneh Golbaghi ◽  
Hosein Shojaee-Farah Abady ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Removal Efficiency ◽  
Uv Irradiation ◽  
Zno Nanoparticles ◽  
Uv Light ◽  
Elimination Rate ◽  
Zno Nanoparticle ◽  
Weight Percentage ◽  
Photocatalytic Removal

Background: Volatile organic compounds are the major environmental pollutants causing adverse effects on the human health and the environment, therefore, tremendous effort has been put toward eliminating these compounds. Methods: In this study, the effect of synthesized nanoparticles on the removal of styrene from gas phase by photocatalytic process under UV irradiation in the cylindrical photoreactor was studied. The activated carbon-zinc oxide (AC-ZnO) catalysts were prepared at different weight ratios (6%, 12%, and 18%) of ZnO. The prepared catalyst was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and Brunauer-Emmett-Teller (BET) analyses. The effects of various parameters, such as concentrations of styrene, various weight percentage (wt%) of nanoparticles, and UV irradiation, were investigated. The efficiency of the AC-ZnO catalyst was determined based on its adsorption capacity, breakthrough time, and removal efficiency. Results: It was revealed that the photocatalytic removal efficiency of styrene was high in the presence of both ZnO nanoparticle and AC under UV light. Under optimal conditions, the efficiency of UV/ACZnO 18%, UV/AC-ZnO 12%, and UV/AC-ZnO 6% catalysts was 77%, 86%, and 83%, respectively. By increasing the concentration of input styrene, the photocatalytic removal efficiency was reduced, while the adsorption capacity of styrene increased. Conclusion: According to the results, the AC-ZnO 12% exhibited higher activity compared to other photocatalysts. Also, the amount of stabilized ZnO nanoparticles on the activated carbon affects the elimination rate of styrene.

scholarly journals One-Step Carbothermal Synthesis of Super Nanoadsorbents for Rapid and Recyclable Wastewater Treatment

Crystals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 75
Author(s):  
Wen-chan Ji ◽  
Ping Hu ◽  
Xiao-yu Wang ◽  
Sandra Elizabeth Saji ◽  
Tian Chang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Magnetic Properties ◽  
Wastewater Treatment ◽  
Adsorption Capacity ◽  
Industrial Wastewater ◽  
Magnetic Response ◽  
Carbothermal Synthesis ◽  
One Step ◽  
Solid Liquid ◽  
Solid Liquid Separation

As a potential magnetic super adsorbent in wastewater treatment, Fe3O4 has been researched intensively up to date. However, its key problem of poor comprehensive magnetic properties is still challenging. In this work, an effective solution to this problem has been developed by a one-step carbothermal synthesis of Fe3O4 crystals, which are merited with pure-stoichiometry (FeO-phase free), high crystallinity, small-size (~10 nm), strong magnetism and sensitive magnetic response. The unveiled saturation magnetization of Fe3O4 nanoparticles reaches as high as 90.32 emu·g−1, and the fastest magnetic response time is as short as only 5 s. Such magnetic Fe3O4 super adsorbents exhibit outstanding performance when applied as an adsorbent for wastewater treatment. They can quickly and effectively adsorb methylene blue with an adsorption capacity of 62.5 mg·g−1, which is much higher than that of Fe3O4 adsorbents prepared by other methods reported in the literature. Importantly, this capacity is refreshable after removing the adsorbed methylene blue just by ultrasonic cleaning. With such combined outstanding magnetic properties and recyclable adsorption capacity, the problems associated with the conventional adsorbent solid–liquid separation could be resolved, thus making a forward development towards industrial wastewater treatment.

RESEARCH AND EVALUATE TREATMENT EFFICIENCY ON TAPIOCA PROCESSING INDUSTRIAL WASTEWATER BY AEROBIC BIOFILTER TECHNOLOGY WITH VARIOUS MATERIALS

2010 ◽  
Vol 13 (3) ◽  
pp. 54-66
Author(s):  
Phuong Thi Thanh Nguyen ◽  
Phuoc Van Nguyen ◽  
Anh Cam Thieu
Keyword(s):  
Wastewater Treatment ◽  
Industrial Wastewater ◽  
Utilization Rate ◽  
Organic Loading ◽  
Treatment Efficiency ◽  
Research Results ◽  
Loading Rates

This study was performed to evaluate the efficiency of tapioca processing wastewater treatment using aerobic biofilter with variety of biofilter media: coir, coal, PVC plastic and Bio - Ball BB15 plastic. Research results in the lab demonstrated all four aerobic biofilter models processed can treated completely N and COD which COD reached 90-98% and N reached 61-92%, respectively, at the organic loading rates in range of 0.5, 1, 1.5 and 2 kgCOD/m3.day. The results identified coir filter was the best in four researched materials with removal COD and specific substract utilization rate can reach 98%, and 0.6 kg COD/kgVSS.day. Research results open the new prospects for the application of the cheap materials, available for wastewater treatment.

APPLICATION OF THE FLOCCULATION PROCESS IN THE INDUSTRIAL WASTEWATER TREATMENT

2016 ◽  
Vol 15 (3) ◽  
pp. 521-526
Author(s):  
Narcis Barsan ◽  
Mariana Turcu ◽  
Emilian Mo.negu.u ◽  
Mihaela Dascalu ◽  
Dana Chitimus ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Industrial Wastewater ◽  
Industrial Wastewater Treatment ◽  
Flocculation Process
Sign in / Sign up

Export Citation Format

Share Document