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Synthesis of activated carbon from spent tea leaves for aspirin removal

Chinese Journal of Chemical Engineering 2018年第5期26卷 1003-1011页

作者： Syieluing Wong Yowjeng Lee norzita ngadi Ibrahim Mohammed Inuwa Nurul Balqis Mohamed Department of Chemical Engineering Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia Malaysia Department of Industrial Chemistry Kaduna State University Kaduna Nigeria

Adsorption capacity of activated carbon prepared from spent tea leaves(STL-AC) for the removal of aspirin from aqueous solution was investigated in this study. Preliminary studies have shown that treatment with phosphoric acid(H_3PO_4) increased removal efficiency of STL-AC. Characterizations on STL-AC revealed excellent textural properties(1200 m^2·g^(-1), 51% mesoporosity), as well as distinctive surface chemistry(1.08 mmol·g^(-1) and 0.54 mmol·g^(-1) for acidic and basic oxygenated groups, pH_(pzc)= 2.02). Maximum removal efficiency of aspirin observed was 94.28% after 60 min when the initial concentration was 100 mg·L^(-1), 0.5 g of adsorbent used,pH 3 and at a temperature of 30 ℃. The adsorption data were well fitted to the Freundlich isotherm model and obeyed the pseudo-second order kinetics model. The adsorption of aspirin onto STL-AC was exothermic in nature(ΔH~Θ=^(-1)3.808 k J·mol^(-1)) and had a negative entropy change, ΔS~Θ(-41.444 J·mol^(-1)). A negative Gibbs free energy, ΔG~Θ was obtained indicating feasibility and spontaneity of the adsorption process. The adsorption capacity of AC-STL(178.57 mg·g^(-1)) is considerably high compared to most adsorbents synthesized from various sources, due to the well-defined textural properties coupled with surface chemistry of STL-AC which favors aspirin adsorption. The results demonstrate the potential of STL-AC as aspirin adsorbent.

关键词：阿司匹林移动效率激活吸附能力合成碳茶表面化学

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From pollutant to solution of wastewater pollution: Synthesis of activated carbon from textile sludge for dye adsorption

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Chinese Journal of Chemical Engineering 2018年第4期26卷 870-878页

作者： Syieluing Wong Nurul Atiqah Najlaa Yac'cob norzita ngadi Onn Hassan Ibrahim M.Inuwa Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia Department of Industrial Chemistry Kaduna State University

Adsorption is an important process in wastewater treatment,and conversion of waste materials to adsorbent offers a solution to high material cost related to the use of commercial activated *** study investigated the adsorption behaviour of Reactive Black 5(RB5)and methylene blue(MB)onto activated carbon produced from textile sludge(TSAC).The activated carbon was synthesized through chemical activation of precursor followed with carbonization at 650°C under nitrogen *** of time(0–200 min),pH(2–10),temperature(25–60°C),initial dye concentration(0–200 mg·L^(-1)),and adsorbent dosage(0.01–0.15 g)on dye removal efficiency were *** screening revealed that TSAC synthesized via H_2SO_4activation showed higher adsorption behaviour than TSAC activated by KCl and ZnCl_*** adsorption capacity of TSAC was found to be 11.98 mg·g^(-1)(RB5)and 13.27 mg·g^(-1)(MB),and is dependent on adsorption time and initial dye *** adsorption data for both dyes were well fitted to Freundlich isotherm model which explains the heterogeneous nature of TSAC *** dye adsorption obeyed pseudo-second order kinetic model,thus chemisorption was the controlling *** study reveals potential of textile sludge in removal of dyes from aqueous solution,and further studies are required to establish the applicability of the synthesized adsorbent for the treatment of waste water containing toxic dyes from textile industry.

关键词：化学激活染料吸附废水处理纺织品污染物质碳化污泥合成

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Process Optimization of Effective Partition Constant in Progressive Freeze Concentration of Wastewater

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Advances in Chemical Engineering and Science 2013年第4期3卷 286-293页

作者： Mazura Jusoh Anwar Johari norzita ngadi Zaki Yamani Zakaria 不详

Response surface methodology (RSM) was employed to optimize the process parameters for effective partition constant (K) in progressive freeze concentration (PFC) of wastewater. The effects of coolant temperature, circulation flowrate, initial solution concentration and circulation time on the effective partition constant were observed. Results show that the data were adequately fitted into a second-order polynomial model. The linear and quadratic of independent variables, coolant temperature, circulation flowrate, initial solution concentration and circulation time as well as their interactions have significant effects on the effective partition constant. It was predicted that the optimum process parameters within the experimental ranges for the best K would be with coolant temperature of -8.8℃, circulation flowrate of 1051.1 ml/min, initial solution concentration of 6.59 mg/ml and circulation time of 13.9 minutes. Under these conditions, the effective partition constant is predicted to be 0.17.

关键词： Effective Partition Constant Wastewater Treatment Progressive Freeze Concentration

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Utilization of Polyethylenimine(PEI)Modified Carbon Black Adsorbent Derived from Tire Waste for the Removal of Aspirin

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Journal of Pharmacy and Pharmacology 2019年第4期7卷 222-227页

作者： Dyg Khairunnisa Awg Zaini norzita ngadi Muhd Asyiq Azman Khairudin Ahmad Faculty of Engineering School of Chemical EngineeringUniversiti Teknologi MalaysiaJohor BahruJohor 81310Malaysia

A new adsorbent was synthesized using polyethylenimine(PEI)on the carbon black to remove aspirin from an aqueous *** this study,adsorption performance of modified carbon black by polyethylenimine(PEI)on aspirin was *** adsorption studies were performed to evaluate the effects of contact time,pH solution,temperature,and initial concentration on the adsorption of *** this study,the carbon black obtained from the pyrolysis of tire waste was used as a precursor for low-cost *** carbon black was treated by 1 M of hydrochloric acid solution to remove ash and sulphur ***,the treated carbon black was modified by impregnation with PEI in one to one weight ratio within 24 hours at 65°C and then cross linked with 1%(w/v)glutaraldehyde solution for one *** adsorption rate of aspirin by modified carbon black was rapid from 20 minutes to 60 minutes and reached ***,the optimum contact time for this study is 60 minutes with 59.96%of aspirin removal and 29.98 mg/g adsorption *** best performance for pH solution,temperature,and initial concentration was observed at pH 3(26.1 mg/g),30°C(26.9 mg/g)and 20 ppm(40.96 mg/g)respectively.

关键词： Aspirin adsorption polyethylenimine waste tire modified adsorbent

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