Highly efficient removal of phosphate by lanthanum-doped mesoporous SiO2

Ou, Encai; Zhou, Junjie; Shao-chun, Mao; Wang, Jiaqiang; Xia, Fei

doi:10.1016/j.colsurfa.2007.05.027

Cited by 91 publications

(53 citation statements)

References 20 publications

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“…This suggests that the observed sorption feature is caused by the monolayer adsorption, which is similar to the findings reported in the literature by using Al-impregnated mesoporous silicates [59] and La-doped mesoporous silicates for phosphate removal [60]. As shown in Table 2, quantitative Langmuir parameters q 0 for S15-NN-Fe-0.5, which is 20.7 mg P/g, is significantly greater than those of S15-NN-Fe-0.1 (4.7 mg P/g) and S15-NN-Fe-0.3 (8.8 mg P/g).…”

Section: Phosphate Adsorptionsupporting

confidence: 79%

One-pot synthesis of Fe(III)-coordinated diamino-functionalized mesoporous silica: Effect of functionalization degrees on structures and phosphate adsorption

Huang

Yang

et al. 2013

Microporous and Mesoporous Materials

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. analysis, FT-IR spectroscopy, and nitrogen adsorption-desorption, were utilized to investigate the effect of functionalization degrees of absorbents on their chemical composition, surface chemistry, pore structures and phosphate adsorption capacities in detail. In the batch adsorption tests, the functionalized absorbents with increasing loadings of diamino groups possessed markedly enhanced adsorption capacities, although there was a gradual loss of ordered mesostructures accompanied. The adsorption isotherms were represented better by using Langmuir model than Freundlich model, which indicated the presence of monolayer adsorption. In particular, for the resulting absorbent prepared with 0.5:1 molar ratio of AAPTS and TEOS, the maximum phosphate capture capacity calculated from Langmuir model is 20.7 mg P/g. In the kinetic study, the phosphate adsorption followed pseudo-second-order equation well with a correlation coefficient of 0.999, suggesting the adsorption process be chemisorption. The phosphate adsorption efficiency of prepared absorbent was highly pH-dependent and the high removal of phosphate was achieved within the pH between 3.0 and 6.0. The presence of Cl − and NO 3 − exhibited small impacts on the phosphate adsorption by using our synthesized absorbent; whereas, there were significantly negative effects from HCO 3 − and SO 4 2− on the phosphate removal. In 0.010 M NaOH, more than 90% of the absorbed phosphate anions on the spent adsorbent could be desorbed, suggesting the absorbent with a capacity of regeneration.

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Section: Phosphate Adsorptionsupporting

confidence: 79%

One-pot synthesis of Fe(III)-coordinated diamino-functionalized mesoporous silica: Effect of functionalization degrees on structures and phosphate adsorption

Huang

Yang

et al. 2013

Microporous and Mesoporous Materials

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“…The P discharged into surface waters stimulates the growth of aquatic microand macro-organisms in nuisance quantities, which can cause eutrophication when occurring in excess in stagnant water bodies (Southam et al 2004). Therefore, the removal of P from wastewater is necessary for the control of eutrophication in lakes and similar stagnant water bodies ( } Ozacar 2003;Ou et al 2007). Many P removal technologies, including biological, chemical, and physical treatment methods, have been developed for the removal of phosphate from municipal and industrial effluents (Genz et al 2004;Chen et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of phosphorus adsorption capacity of sesame straw biochar on aqueous solution: influence of activation methods and pyrolysis temperatures

Park

Kim

et al. 2015

Environ Geochem Health

119

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The phosphorus (P) adsorption characteristic of sesame straw biochar prepared with different activation agents and pyrolysis temperatures was evaluated. Between 0.109 and 0.300 mg L(-1) in the form of inorganic phosphate was released from raw sesame straw biochar in the first 1 h. The release of phosphate was significantly enhanced from 62.6 to 168.2 mg g(-1) as the pyrolysis temperature increased. Therefore, sesame straw biochar cannot be used as an adsorbent for P removal without change in the physicochemical characteristics. To increase the P adsorption of biochar in aqueous solution, various activation agents and pyrolysis temperatures were applied. The amount of P adsorbed from aqueous solution by biochar activated using different activation agents appeared in the order ZnCl2 (9.675 mg g(-1)) > MgO (8.669 mg g(-1)) ⋙ 0.1N-HCl > 0.1N-H2SO4 > K2SO4 ≥ KOH ≥ 0.1N-H3PO4, showing ZnCl2 to be the optimum activation agent. Higher P was adsorbed by the biochar activated using ZnCl2 under different pyrolysis temperatures in the order 600 °C > 500 °C > 400 °C > 300 °C. Finally, the amount of adsorbed P by activated biochar at different ratios of biochar to ZnCl2 appeared in the order 1:3 ≒ 1:1 > 3:1. As a result, the optimum ratio of biochar to ZnCl2 and pyrolysis temperature were found to be 1:1 and 600 °C for P adsorption, respectively. The maximum P adsorption capacity by activated biochar using ZnCl2 (15,460 mg kg(-1)) was higher than that of typical biochar, as determined by the Langmuir adsorption isotherm. Therefore, the ZnCl2 activation of sesame straw biochar was suitable for the preparation of activated biochar for P adsorption.

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“…Phosphorus recovery using adsorption processes has received considerable attention because of its efficiency and simplicity compared to biological methods, aggregation-sedimentation and crystallization processes [2]. Many adsorbents, derived from industrial by-products, have been reported to be used for phosphorus removal, such as Ca-and Fe-based adsorbents using dehydrated lime and blast furnace slag [5], lanthanum-loaded SiO 2 [6] and zirconium-loaded activated carbon [7]. Agricultural byproducts, e.g., orange waste obtained just after juicing, are major solid wastes produced by the food industry.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus recovery from secondary effluent and side-stream liquid in a sewage treatment plant using zirconium-loaded saponified orange waste

Ohura

Harada

Biswas

et al. 2011

J Mater Cycles Waste Manag

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Zirconium was loaded onto orange waste, a cheap and available agricultural waste in Japan, to investigate the feasibility of its utilization for phosphorus recovery from secondary effluent and side-stream liquid, which contain 5.9 and 68.2 mg/dm 3 phosphorus, respectively. The phosphorus removal from side-stream liquid by using zirconium-loaded saponified orange waste (Zr-SOW) gel increased with an increasing solid/liquid ratio, and it was found that Zr-SOW gel showed better performance than zirconium ferrite. The prepared adsorbent was effective for phosphorus removal and exhibited a reasonably high adsorption capacity, twice than that of zirconium ferrite. The secondary effluent was treated in a column packed with Zr-SOW gel, and an dynamic adsorption capacity of 1.3 mol-P/ kg was attained. The adsorbed phosphorus from the column was successfully eluted as a concentrated form by using a small amount of 0.2 M NaOH. Throughout the elution process, zirconium was not leaked from the adsorption gel.

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Highly efficient removal of phosphate by lanthanum-doped mesoporous SiO2

Cited by 91 publications

References 20 publications

One-pot synthesis of Fe(III)-coordinated diamino-functionalized mesoporous silica: Effect of functionalization degrees on structures and phosphate adsorption

One-pot synthesis of Fe(III)-coordinated diamino-functionalized mesoporous silica: Effect of functionalization degrees on structures and phosphate adsorption

Evaluation of phosphorus adsorption capacity of sesame straw biochar on aqueous solution: influence of activation methods and pyrolysis temperatures

Phosphorus recovery from secondary effluent and side-stream liquid in a sewage treatment plant using zirconium-loaded saponified orange waste

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