Aaima Iftikhar, Qaisar Mahmood, Malik Tahir Hayat, Maria Siddique, Bibi Saima Zeb
{"title":"UV/Fenton based treatment of paper recycling industry wastewater","authors":"Aaima Iftikhar, Qaisar Mahmood, Malik Tahir Hayat, Maria Siddique, Bibi Saima Zeb","doi":"10.5004/dwt.2023.29705","DOIUrl":"https://doi.org/10.5004/dwt.2023.29705","url":null,"abstract":"","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134883735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Enran Fan, Ping Fang, Lu Wen, Nan Wang, Min Zhao, Yan Li
In the context of “carbon peaking” and “carbon neutralization”, Fe 3 O 4 -SAC magnetic carbon, a modified material prepared from fouling peat, was used to enhance the effectiveness of polyvinylidene fluoride (PVDF) membranes in treating dye wastewater. Three dyestuffs, methyl violet, malachite green and Congo red, were tested in terms of water flux, retention rate and pollution resistance to investigate the effect of the modified membranes on the treatment of dyestuffs. The optimal performance of the modified membranes was investigated by varying the ion concentration, initial concentration, and pH value. A group of modified membranes (TiO 2 /Fe 3 O 4 -SAC/PVP/PVDF) was made by adding 1.5 wt.% of TiO 2 to the casting solution and then adding different ratios of SAC-Fe 3 O 4 to test the effect. The results showed that when the TiO 2 content was 1.5 wt.% and Fe 3 O 4 /SAC content was 0.2 wt.%, the membranes had the best overall performance and could retain 71.24% of methyl violet, 75.62% of malachite green and 65.72% of Congo red, with fluxes of 827.35, 769.45 and 729.53 L/(m 2 ·h), respectively), and the average Fe 3 O 4 /SAC preparation using 1 kg of municipal sludge can reduce 1.94 kg of CO 2 emission, while using the modified membrane can reduce approximately 0.80~1.49 kg of CO 2 emission per 1 ton of dye wastewater treated.
{"title":"Study of TiO2/Fe3O4-SAC/PVDF membrane for dye wastewater treatment under \"double carbon\" target","authors":"Enran Fan, Ping Fang, Lu Wen, Nan Wang, Min Zhao, Yan Li","doi":"10.5004/dwt.2023.29738","DOIUrl":"https://doi.org/10.5004/dwt.2023.29738","url":null,"abstract":"In the context of “carbon peaking” and “carbon neutralization”, Fe 3 O 4 -SAC magnetic carbon, a modified material prepared from fouling peat, was used to enhance the effectiveness of polyvinylidene fluoride (PVDF) membranes in treating dye wastewater. Three dyestuffs, methyl violet, malachite green and Congo red, were tested in terms of water flux, retention rate and pollution resistance to investigate the effect of the modified membranes on the treatment of dyestuffs. The optimal performance of the modified membranes was investigated by varying the ion concentration, initial concentration, and pH value. A group of modified membranes (TiO 2 /Fe 3 O 4 -SAC/PVP/PVDF) was made by adding 1.5 wt.% of TiO 2 to the casting solution and then adding different ratios of SAC-Fe 3 O 4 to test the effect. The results showed that when the TiO 2 content was 1.5 wt.% and Fe 3 O 4 /SAC content was 0.2 wt.%, the membranes had the best overall performance and could retain 71.24% of methyl violet, 75.62% of malachite green and 65.72% of Congo red, with fluxes of 827.35, 769.45 and 729.53 L/(m 2 ·h), respectively), and the average Fe 3 O 4 /SAC preparation using 1 kg of municipal sludge can reduce 1.94 kg of CO 2 emission, while using the modified membrane can reduce approximately 0.80~1.49 kg of CO 2 emission per 1 ton of dye wastewater treated.","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135262038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mixuan Ye, Tao Hu, Haidong Zhou, Xinxuan Xu, Tianyu Wu, Zuxin Wang, Jingyuan Zhang
With the increasing impact of antibiotics on the environment, membrane separation technology has been widely used to treat antibiotics in water environment. The poor hydrophilicity of poly - vinylidene fluoride (PVDF) membrane leads to the problems of low water flux and easy surface pollution during membrane separation. In this study, the surface of PVDF base film was modi - fied by polyethyleneimine (PEI). The influence of modified membrane on the retention capacity, anti-fouling property and operation characteristics of sulfamethoxazole (SMX) and tetracycline (TC) was investigated. The effect of PEI concentration on the comprehensive performance of pure water flux and antibiotic rejection was investigated by changing the molecular weight of PEI. The results showed that the comprehensive performance was relatively best when the molecular weight of PEI was 10,000 Da (P-10K). It could remove 57.5% and 30% of SMX and TC from the simulated water samples, and 88.2% and 62.4% of SMX and TC from the actual river water samples. However, it is also accompanied by a large degree of membrane fouling, resulting in a decrease in membrane separation performance. After the rotation test of single factor variables, it was found that the cat - ion strength and humic acid concentration had the greatest influence on the flux and antibiotic retention of the modified membrane through the steric hindrance effect. In the anti-fouling per - formance test, the membrane flux can be restored to 85% and 92.3% of the initial flux after acid washing and alkali washing, indicating that the anti-fouling performance of the PVDF membrane after surface cross-linking modification is improved.
{"title":"Removal of sulfamethoxazole and tetracycline in water using polyvinylidene fluoride membrane modified with polyethyleneimine","authors":"Mixuan Ye, Tao Hu, Haidong Zhou, Xinxuan Xu, Tianyu Wu, Zuxin Wang, Jingyuan Zhang","doi":"10.5004/dwt.2023.29731","DOIUrl":"https://doi.org/10.5004/dwt.2023.29731","url":null,"abstract":"With the increasing impact of antibiotics on the environment, membrane separation technology has been widely used to treat antibiotics in water environment. The poor hydrophilicity of poly - vinylidene fluoride (PVDF) membrane leads to the problems of low water flux and easy surface pollution during membrane separation. In this study, the surface of PVDF base film was modi - fied by polyethyleneimine (PEI). The influence of modified membrane on the retention capacity, anti-fouling property and operation characteristics of sulfamethoxazole (SMX) and tetracycline (TC) was investigated. The effect of PEI concentration on the comprehensive performance of pure water flux and antibiotic rejection was investigated by changing the molecular weight of PEI. The results showed that the comprehensive performance was relatively best when the molecular weight of PEI was 10,000 Da (P-10K). It could remove 57.5% and 30% of SMX and TC from the simulated water samples, and 88.2% and 62.4% of SMX and TC from the actual river water samples. However, it is also accompanied by a large degree of membrane fouling, resulting in a decrease in membrane separation performance. After the rotation test of single factor variables, it was found that the cat - ion strength and humic acid concentration had the greatest influence on the flux and antibiotic retention of the modified membrane through the steric hindrance effect. In the anti-fouling per - formance test, the membrane flux can be restored to 85% and 92.3% of the initial flux after acid washing and alkali washing, indicating that the anti-fouling performance of the PVDF membrane after surface cross-linking modification is improved.","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135262326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Motasem Y.D. Alazaiza, Ahmed Albahnasawi, Murat Eyvaz, Dia Eddin Nassani, Salem S. Abu Amr, Mohammed Shadi S. Abujazar, Omar Al-Maskari
{"title":"Electrochemical-based advanced oxidation for hospital wastewater treatment","authors":"Motasem Y.D. Alazaiza, Ahmed Albahnasawi, Murat Eyvaz, Dia Eddin Nassani, Salem S. Abu Amr, Mohammed Shadi S. Abujazar, Omar Al-Maskari","doi":"10.5004/dwt.2023.29714","DOIUrl":"https://doi.org/10.5004/dwt.2023.29714","url":null,"abstract":"","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135262337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Increase in efficiency of separating pollution from sewage sludge through the pressure filtration process","authors":"Mariusz Kowalczyk, Tomasz Kamizela","doi":"10.5004/dwt.2023.29523","DOIUrl":"https://doi.org/10.5004/dwt.2023.29523","url":null,"abstract":"","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135447654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Heavy metal content of sludge is one of the most important factors determining their final usage. However, total metal content of sludge is not a suitable indicator for assessing its bioavailability. A more substantial assessment is to determine the occurrence of metals bound by sludge components, which means fractions. Three types of sludge (excess sludge, post-fermentation sludge and dried sludge, which were taken in four quarters of 2019/2020 from one sewage treatment plant, were studied in this paper. Determinations of total Zn, Cu, Cr, Ni, Pb, Cd and their fractions were determined using Tessier method. Zinc was the most abundant in sludge, followed by copper, then chromium, nickel, lead, and the least cadmium. Total content of determined metals depended on how sludge was processed and, to some extent, on the sampling date. All analysed sludge types, due to their total content, can be used in agriculture. It was found that the distribution of metal fractions varied more with sludge type than sampling date. In the analysed sludges, irrespective of sampling date and sludge type, the distribution of metals in the fractions was as follows: Zn: reducible > exchangeable > residual > carbonate > oxidisable > soluble, Cu: oxidisable > exchange-able > residual > soluble > carbonate > reducible, Cr: reducible > residual > exchangeable > carbonate > oxidisable > soluble, Ni: reducible > carbonate > exchangeable > residual > soluble > oxidisable, Pb: residual > exchangeable > reducible > oxidisable > carbonate > soluble >, Cd: residual > reducible > exchangeable > carbonate > oxidisable > soluble. The shift of the mobile to non-mobile metal fraction was influenced by the sludge treatment method. These shifts were the most influenced by fermentation, and slightly less by sludge drying.
{"title":"Heavy metal speciation in municipal sewage sludge depending on treatment method","authors":"Józefa Wiater, Maria Sulewska","doi":"10.5004/dwt.2023.29573","DOIUrl":"https://doi.org/10.5004/dwt.2023.29573","url":null,"abstract":"Heavy metal content of sludge is one of the most important factors determining their final usage. However, total metal content of sludge is not a suitable indicator for assessing its bioavailability. A more substantial assessment is to determine the occurrence of metals bound by sludge components, which means fractions. Three types of sludge (excess sludge, post-fermentation sludge and dried sludge, which were taken in four quarters of 2019/2020 from one sewage treatment plant, were studied in this paper. Determinations of total Zn, Cu, Cr, Ni, Pb, Cd and their fractions were determined using Tessier method. Zinc was the most abundant in sludge, followed by copper, then chromium, nickel, lead, and the least cadmium. Total content of determined metals depended on how sludge was processed and, to some extent, on the sampling date. All analysed sludge types, due to their total content, can be used in agriculture. It was found that the distribution of metal fractions varied more with sludge type than sampling date. In the analysed sludges, irrespective of sampling date and sludge type, the distribution of metals in the fractions was as follows: Zn: reducible > exchangeable > residual > carbonate > oxidisable > soluble, Cu: oxidisable > exchange-able > residual > soluble > carbonate > reducible, Cr: reducible > residual > exchangeable > carbonate > oxidisable > soluble, Ni: reducible > carbonate > exchangeable > residual > soluble > oxidisable, Pb: residual > exchangeable > reducible > oxidisable > carbonate > soluble >, Cd: residual > reducible > exchangeable > carbonate > oxidisable > soluble. The shift of the mobile to non-mobile metal fraction was influenced by the sludge treatment method. These shifts were the most influenced by fermentation, and slightly less by sludge drying.","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135447683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aleksandra Bogdanowicz, Andrzej Krasiński, Monika Żubrowska-Sudoł
The separation of microplastics from water using the filtration process was studied in this work. The deep-bed filter media were made of polypropylene using the melt-blown technique. The separation performance of these filters was compared to the pleated cellulose elements (surface filtration) for the prepared suspension of fragmented polystyrene particles. No pretreatment nor additives to enhance the separation process were applied upstream the filtration unit. With the increased filter efficiency (rating of depth filters ranging from 20 to 5 µ), the cut-off dimeter of removed microplastic also decreased. The experiments confirmed that deep bed filtration is capable to remove efficiently very fine microplastic particles (as small as 1 µ), while maintaining relatively low pressure drop. The capacity of the deep bed filter will guarantee relatively long operation time for suspensions having a low concentration of MPs, however in real process this will probably be predominantly affected by the simultaneous deposition of other solid contaminants present in the water.
{"title":"Performance of filters applied for removal of microplastics from water – testing methodology","authors":"Aleksandra Bogdanowicz, Andrzej Krasiński, Monika Żubrowska-Sudoł","doi":"10.5004/dwt.2023.29396","DOIUrl":"https://doi.org/10.5004/dwt.2023.29396","url":null,"abstract":"The separation of microplastics from water using the filtration process was studied in this work. The deep-bed filter media were made of polypropylene using the melt-blown technique. The separation performance of these filters was compared to the pleated cellulose elements (surface filtration) for the prepared suspension of fragmented polystyrene particles. No pretreatment nor additives to enhance the separation process were applied upstream the filtration unit. With the increased filter efficiency (rating of depth filters ranging from 20 to 5 µ), the cut-off dimeter of removed microplastic also decreased. The experiments confirmed that deep bed filtration is capable to remove efficiently very fine microplastic particles (as small as 1 µ), while maintaining relatively low pressure drop. The capacity of the deep bed filter will guarantee relatively long operation time for suspensions having a low concentration of MPs, however in real process this will probably be predominantly affected by the simultaneous deposition of other solid contaminants present in the water.","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135447689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Both sludge biochar (BC) and activated coke (ACO) are hierarchical while their surface properties have a large disparity. We show that sludge biochar pyrolyzed at 600°C (BC600) outperforms biochar produced at other temperatures for a range of biomass feedstock. BC600 displays lower carbon content, lower surface area, and importantly more abundant surface oxygen-containing functional groups when compared with ACO. BC600 and ACO were used to activate peroxydi - sulfate (PDS) for tetracycline oxidation while the degradation mechanisms were comprehen - sively discussed. Interestingly, ACO demonstrated a particularly higher performance where activating PDS compared with BC600. The K app value for the synergetically combined ACO-PDS process was 2.15 times that of the sum of adsorption and PDS oxidation processes alone, while it was 1.72 times for the BC600-PDS process. Solution pH had a more dramatic influence on BC600 than on ACO. Quenching experiments proved that both OH • and SO 4 •– contributed insignificantly while most of the degradation was attributed to superoxide radical (O 2 •– ), singlet oxygen ( 1 O 2 ), and active holes (h + ). After reducing carbonyl groups on both carbons by KBH 4 in absolute alcohol, quenching experiments did not indicate the key role of carbonyl groups for 1 O 2 generation. Non-radical pathway proved dominant in the carbon/PDS catalytic process. Excellent reusability and stability for ACO was observed in repeated use experiments.
{"title":"Comparative study of tetracycline degradation efficiency using peroxydisulfate activated with sludge biochar and activated coke: the role of surface defects","authors":"Guoting Li, Huan Chen, Taiyang Cao, Xiangping Ran, Yujie Guo, Chenliang Shen, Yingxu Liu, Tannaz Pak","doi":"10.5004/dwt.2023.29657","DOIUrl":"https://doi.org/10.5004/dwt.2023.29657","url":null,"abstract":"Both sludge biochar (BC) and activated coke (ACO) are hierarchical while their surface properties have a large disparity. We show that sludge biochar pyrolyzed at 600°C (BC600) outperforms biochar produced at other temperatures for a range of biomass feedstock. BC600 displays lower carbon content, lower surface area, and importantly more abundant surface oxygen-containing functional groups when compared with ACO. BC600 and ACO were used to activate peroxydi - sulfate (PDS) for tetracycline oxidation while the degradation mechanisms were comprehen - sively discussed. Interestingly, ACO demonstrated a particularly higher performance where activating PDS compared with BC600. The K app value for the synergetically combined ACO-PDS process was 2.15 times that of the sum of adsorption and PDS oxidation processes alone, while it was 1.72 times for the BC600-PDS process. Solution pH had a more dramatic influence on BC600 than on ACO. Quenching experiments proved that both OH • and SO 4 •– contributed insignificantly while most of the degradation was attributed to superoxide radical (O 2 •– ), singlet oxygen ( 1 O 2 ), and active holes (h + ). After reducing carbonyl groups on both carbons by KBH 4 in absolute alcohol, quenching experiments did not indicate the key role of carbonyl groups for 1 O 2 generation. Non-radical pathway proved dominant in the carbon/PDS catalytic process. Excellent reusability and stability for ACO was observed in repeated use experiments.","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135496522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Do Thi Hai, Nguyen Thu Phuong, Pham Xuan Cong, Nguyen Hong Nam, Le Phuong Thu, Nguyen Thi Thu Trang, Nguyen Thi Thom, Pham Thi Nam, Magdalena Osial, Dinh Thi Mai Thanh
In this work, a nanostructural composite based on the superparamagnetic iron oxide nanoparticles (SPIONs) coated with hydroxyapatite (HAp) was demonstrated as an effective adsorbent for the removal of the Congo red (CR) from aqueous solutions. Prior to its application on the model pollutant, the morphology, crystallinity, specific surface area, chemical composition, and magnetic properties were characterized with several techniques, including scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, Brunauer–Emmett– Teller, and vibrating sample magnetometer. Amongst composites synthesized in different ratios of SPION’s weight, the composite containing 35 wt.% of SPION was chosen to adsorb CR. The magnetization saturation of the latter was about 20.39 emu·g –1 , still enough for magnetic separation. The effect of adsorbent mass, pH, initial concentration, temperature, and contact time on the adsorption efficiency and capacity of CR was evaluated using UV-Vis spectrometry. It was shown that the most effective results of CR removal were achieved for 0.10 g dosage of SPION/HAp to absorb 50 mL of CR solution of 50 mg·L –1 at pH 0 and a contact time of 4 h. The CR adsorption process on SPION/ HAp composite is matched with the pseudo-second-order kinetic model and the Langmuir model. The obtained thermodynamic parameters (Δ G ° > 0, Δ H ° = –39.02 kJ·mol –1 , Δ S ° = –0.134 kJ·mol –1 ·K –1 ) suggest that the adsorption of CR onto the composite is non-spontaneous, exothermic, with a rising of randomness at the adsorbate–adsorbent interface. The maximum CR adsorption capacity using the SPION/HAp adsorbent was determined to be 158.98 mg·g –1 , suggesting that the adsor-bent has a satisfactory potential to adsorb CR. The chosen composite can be easily separated using magnets, making it a promising material for wastewater treatment.
{"title":"Hydroxyapatite/superparamagnetic iron oxide nanoparticles nanocomposite for Congo red adsorption","authors":"Do Thi Hai, Nguyen Thu Phuong, Pham Xuan Cong, Nguyen Hong Nam, Le Phuong Thu, Nguyen Thi Thu Trang, Nguyen Thi Thom, Pham Thi Nam, Magdalena Osial, Dinh Thi Mai Thanh","doi":"10.5004/dwt.2023.29630","DOIUrl":"https://doi.org/10.5004/dwt.2023.29630","url":null,"abstract":"In this work, a nanostructural composite based on the superparamagnetic iron oxide nanoparticles (SPIONs) coated with hydroxyapatite (HAp) was demonstrated as an effective adsorbent for the removal of the Congo red (CR) from aqueous solutions. Prior to its application on the model pollutant, the morphology, crystallinity, specific surface area, chemical composition, and magnetic properties were characterized with several techniques, including scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, Brunauer–Emmett– Teller, and vibrating sample magnetometer. Amongst composites synthesized in different ratios of SPION’s weight, the composite containing 35 wt.% of SPION was chosen to adsorb CR. The magnetization saturation of the latter was about 20.39 emu·g –1 , still enough for magnetic separation. The effect of adsorbent mass, pH, initial concentration, temperature, and contact time on the adsorption efficiency and capacity of CR was evaluated using UV-Vis spectrometry. It was shown that the most effective results of CR removal were achieved for 0.10 g dosage of SPION/HAp to absorb 50 mL of CR solution of 50 mg·L –1 at pH 0 and a contact time of 4 h. The CR adsorption process on SPION/ HAp composite is matched with the pseudo-second-order kinetic model and the Langmuir model. The obtained thermodynamic parameters (Δ G ° > 0, Δ H ° = –39.02 kJ·mol –1 , Δ S ° = –0.134 kJ·mol –1 ·K –1 ) suggest that the adsorption of CR onto the composite is non-spontaneous, exothermic, with a rising of randomness at the adsorbate–adsorbent interface. The maximum CR adsorption capacity using the SPION/HAp adsorbent was determined to be 158.98 mg·g –1 , suggesting that the adsor-bent has a satisfactory potential to adsorb CR. The chosen composite can be easily separated using magnets, making it a promising material for wastewater treatment.","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135496528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Optimizations for tunnel drainage water system based on locations of crystallizations","authors":"Zhuanghong Lin, Kuangda Liu, Xuefu Zhang, Xiangge Chen, Peng Xie, Yong Tan","doi":"10.5004/dwt.2023.29681","DOIUrl":"https://doi.org/10.5004/dwt.2023.29681","url":null,"abstract":".","PeriodicalId":11260,"journal":{"name":"Desalination and Water Treatment","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135496762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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