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Preparation and Adsorption Properties of Activated Carbon from Glutinous Rice Straw by KOH Method 被引量:2
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作者 梁健 蔡勤 +5 位作者 李波 吴昌演 刘汉林 程静 周健齐 柏松 《Agricultural Science & Technology》 CAS 2015年第11期2549-2551,2567,共4页
[Objective] This study aimed to improve comprehensive utilization value of glutinous rice straw and to develop new raw material for preparation of activated carbon. [Method] Using potassium hydroxide as activator and ... [Objective] This study aimed to improve comprehensive utilization value of glutinous rice straw and to develop new raw material for preparation of activated carbon. [Method] Using potassium hydroxide as activator and glutinous rice straw as raw material, activated carbon was prepared. [Result] The optimum technological conditions for preparation of activated carbon from glutinous rice straw were as fol- lows: activator concentration of 2 mol/L, activation time of 60 min, activation tem- perature of 600 ℃ and carbonization temperature of 450℃. The adsorption values of methylene blue and iodine by activated carbon prepared from glutinous rico straw were 10.21 ml/0.1 g and 920.74 mg/g respectively under the optimal conditions. The quality of the prepared activated carbon met the grade two of water quality purifica- tion-using activated carbon quality standard. [Conclusion] This study will provide certain references for comprehensive utilization of glutinous rice straw and preparation of high-performance activated carbon. 展开更多
关键词 Glutinous rice straw activated carbon ABSORBENT PREPARATION
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Activated Carbon from Rice Husk with One-Step KOH Mechanical Mixing Activation as Adsorbent for Treating Phenolic Wastewater 被引量:2
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作者 Jiang Bolong Jiang Nan +1 位作者 Shi Shunjie Cui Yanyan 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2022年第4期108-119,共12页
This study investigates how large-surface-area biocarbons with high phenolic adsorption capacities can be obtained from cheap and abundant rice husk(RH).The RH is directly mixed with potassium hydroxide(KOH)and activa... This study investigates how large-surface-area biocarbons with high phenolic adsorption capacities can be obtained from cheap and abundant rice husk(RH).The RH is directly mixed with potassium hydroxide(KOH)and activated in a flowing N_(2) atmosphere,and the effects of the pyrolysis temperature and KOH to RH ratio on the structure of the obtained activated carbon adsorbents and their adsorption of p-nitrophenol and phenol are studied.The results show that the optimum pyrolysis temperature of RH is 750℃,whereby the highest surface area of 2047 m^(2)/g and best adsorption performance are obtained with a KOH to RH ratio of 3:1.Moreover,the obtained biocarbons achieve a maximum adsorption capacity of 175 mg/g for phenol and 430 mg/g for p-nitrophenol,which are higher than most previously reported data. 展开更多
关键词 rice husk activated carbon KOH activation wastewater treatment P-NITROPHENOL PHENOL
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Adsorption of Phenol by Activated Carbon Prepared from Waste Rice Straw by Chemical Activation with (NH_4)_2HPO_4 被引量:1
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作者 高品 刘振鸿 +2 位作者 薛罡 韩彬 周美华 《Journal of Donghua University(English Edition)》 EI CAS 2011年第6期552-558,共7页
Activated carbons,RS-1,RS-2,and RS-3,prepared from rice straw with(NH4)2HPO4 activation were used as adsorbents for removing phenols from aqueous solutions.The maximum adsorption capacities of phenol for RS-1,RS-2,and... Activated carbons,RS-1,RS-2,and RS-3,prepared from rice straw with(NH4)2HPO4 activation were used as adsorbents for removing phenols from aqueous solutions.The maximum adsorption capacities of phenol for RS-1,RS-2,and RS-3 were 163.9,172.9,and 200.0 mg/g,respectively.The equilibrium data were analyzed by the Langmuir,Freundlich,and Temkin models.It displayed that Langmuir isotherm fitted to the results best.The dimensionless parameter RL indicated the favorable nature of the adsorption of phenol.Otherwise,the kinetic rates were well explained by pseudo-second-order model.According to the results,activated carbon derived from waste rice straw can be a high-performance adsorbent for wastewater treatment. 展开更多
关键词 activated carbon rice straw PHENOL (NH4)2HPO4 adsorption isotherm
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Cost Effective Adsorption of Aluminium and Iron from Synthetic and Real Wastewater by Rice Hull Activated Carbon (RHAC) 被引量:1
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作者 Nour T. Abdel-Ghani Ghadir A. El-Chaghaby Enas Mohamed Zahran 《American Journal of Analytical Chemistry》 2015年第1期71-83,共13页
The adsorption of aluminium(III) and iron(III) ions from their single and binary systems, by RHAC was investigated in a batch system. The activated carbon prepared from rice hulls was characterized by scanning electro... The adsorption of aluminium(III) and iron(III) ions from their single and binary systems, by RHAC was investigated in a batch system. The activated carbon prepared from rice hulls was characterized by scanning electron microscopy and Fourier transformation infrared techniques. Batch adsorption experiments were performed under different operating conditions including pH (2 - 5), adsorbent dosage (0.5 - 2.0 g/l), initial ion concentration (5 - 100 mg/l), and contact time (30 - 240 min). The equilibrium time for maximum ions removal was found to be 180 min in single and binary ions systems. The kinetics of adsorption was evaluated using the pseudo-first order, pseudo-second order and Elovich kinetic models. The Langmuir, Freundlich and Temkin equilibrium models were applied to the adsorption experimental data. Real wastewater samples were collected from different locations to investigate the efficiency of rice hull activated carbon in treating real samples. The real wastewater samples were treated with the activated carbon prepared from rice hulls and a commercial activated carbon. The results showed that the activated carbon prepared in the present work was more efficient in the removal of aluminium and iron from real wastewater as compared to the commercial activated carbon which is more advantageous considering both economics and environmental parameters. 展开更多
关键词 Aluminium IRON ADSORPTION rice Hulls activated carbon Kinetics EQUILIBRIUM
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Effects of Carbon and Nitrogen Additions on Soil Microbial Biomass Carbon and Enzyme Activities Under Rice Straw Returning 被引量:1
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作者 Dai Jian-jun Liu Li-zhi +4 位作者 Wang Xiao-chun Fang Qiu-na Cheng Ye-ru Wang Dan-ni Peng Xian-long 《Journal of Northeast Agricultural University(English Edition)》 CAS 2021年第3期21-30,共10页
The effects of different amounts of carbon and nitrogen sources on the soil microbial biomass carbon,dissolved organic carbon and related enzyme activities were studied by the simulation experiment of rice straw retur... The effects of different amounts of carbon and nitrogen sources on the soil microbial biomass carbon,dissolved organic carbon and related enzyme activities were studied by the simulation experiment of rice straw returning to the field,and the mechanism of the decomposition of rice straw returning to the field was discussed.Completely randomized experiment of the two factors of the three levels was designed,and a total of nine treatments of indoor soil incubation tests were conducted.Full amount of rice straw was applied to the soil in this simulation experiment and different amounts of brown sugar and urea were added in the three levels of 0(no carbon source and nitrogen source),1(low levels of carbon and nitrogen sources)and 2(high levels of carbon and nitrogen sources),respectively.The results showed that the addition of different amounts of carbon and nitrogen sources to the rice straw could increase the soil carbon content.Compared with T0N0,the microbial biomass carbon of T2N2 was increased significantly by 170.48%;the dissolved organic carbon content of T1N2 was significantly increased by 58.14%and the free humic acid carbon contents of T0N2,T1N1 and T2N0 were significantly increased by 56.16%and 45.55%and 47.80%,respectively;however,there were no significant differences among those of treatments at later incubation periods.The addition of different carbon and nitrogen sources could promote the soil enzyme activities.During the incubation period,all of the soil enzyme activities of adding sugar and urea were higher than those of T0N0 treatment.Therefore,the addition of different amounts of carbon and nitrogen sources to rice straw returning could improve soil microbial biomass carbon content,dissolved organic carbon and soil enzyme activities. 展开更多
关键词 rice straw returning carbon and nitrogen sources microbial biomass carbon dissolved organic carbon soil enzyme activity
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Rice Husk at a Glance:From Agro-Industrial to Modern Applications
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作者 Masoumeh KORDI Naser FARROKHI +1 位作者 Martin I.PECH-CANUL Asadollah AHMADIKHAH 《Rice science》 SCIE CSCD 2024年第1期14-32,共19页
Excessive waste production has led to the concept of a circular bioeconomy to deliver valuable by-products and improve environmental sustainability.The annual worldwide rice production accounts for more than 750 milli... Excessive waste production has led to the concept of a circular bioeconomy to deliver valuable by-products and improve environmental sustainability.The annual worldwide rice production accounts for more than 750 million tons of grain and 150 million tons of husk.Rice husk(RH)contains valuable biomaterials with extensive applications in various fields.The proportions of each component depend primarily on rice genotype,soil chemistry,and climatic conditions.RH and its derivatives,including ash,biochar,hydrochar,and activated carbon have been placed foreground of applications in agriculture and other industries.While the investigation on RH’s compositions,microstructures,and by-products has been done copiously,owing to its unique features,it is still an open-ended area with enormous scope for innovation,research,and technology.Here,we reviewed the latest applications of RH and its derivatives,including fuel and other energy resources,construction materials,pharmacy,medicine,and nanobiotechnology to keep this versatile biomaterial in the spotlight. 展开更多
关键词 circular bioeconomy rice husk activated carbon rice husk ash rice husk biochar rice husk hydrochar rice husk application
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Removal of Cr(VI)from aqueous solution by Rice-husk-based activated carbon prepared by Dual-mode heating method
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作者 Xinchi Zhang Shiliang Wu +3 位作者 Yuan Liu Ziwei Wang Huiyan Zhang Rui Xiao 《Carbon Resources Conversion》 EI 2023年第2期76-84,共9页
Rice husk-based activated carbon was prepared with the help of zinc chloride using microwave and electrical dual-mode heating.The pore characteristics and chemical properties of rice husk-based activated carbon(RH-AC)... Rice husk-based activated carbon was prepared with the help of zinc chloride using microwave and electrical dual-mode heating.The pore characteristics and chemical properties of rice husk-based activated carbon(RH-AC)were characterized by BET,XRD,Raman spectra,FTIR and pHIEP(pH of isoelectric point).The specific surface area of RH-AC is 1719.32 m^(2)/g with a total pore volume of 1.05 cm^(3)/g.The performance of RH-AC for removing Cr(VI)from aqueous solution was examined considering the variation of the contact time(0-120 min),pH value(2.0-9.0),adsorbent dose(0.5-3.0 g/L),initial concentration(28-145 mg/L)and solvent temperature(15-45℃).The ideal pH for Cr(VI)removal is between 2.0 and 3.0 with the equilibrium time of 90 min,achieving the maximum adsorption capacity of 56.82 mg/g with the pH of 3.0.Comparable study on the established kinetic models and isotherms to simulate the removal of Cr(VI)by RH-AC was carried out to sort out the inherent mechanism of the absorption.Reasonable agreements could be obtained by the pseudo-second-order kinetic model and Langmuir,Freundlich and Tempkin isothermal models.Results from Body model simulation suggest that external mass transfer was the essential cause for rate-controlling in the adsorption process of Cr(VI). 展开更多
关键词 activated carbon rice husk CR(VI) ADSORPTION Isothermal model
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Analysis of graphene-like activated carbon derived from rice straw for application in supercapacitor 被引量:5
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作者 Kevin Monthiego Horax Shujuan Bao +1 位作者 Minqiang Wang Yanan Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第12期2290-2294,共5页
Activated carbons with large surface area, abundant microporosity and low cost are the most commonly used electrode materials for energy storage devices. However, activated carbons are conventionally made from fossil ... Activated carbons with large surface area, abundant microporosity and low cost are the most commonly used electrode materials for energy storage devices. However, activated carbons are conventionally made from fossil precursors, such as coal and petroleum, which are limited resources and easily aggregate large block in high temperature carbonization processes. In this novel work, we examined the use of rice straw as a potential alternative carbon source precursor for the production of graphene-like active carbon. A very slack activated carbon with ultra-thin two-dimensional (2D) layer structure was prepared by our proposed approach in this work, which includes a pre-treatment process and potassium hydroxide activation at high temperatures. The obtained active carbon derived from rice straw exhibited a capacitance of 255 Fig at 0.5 A/g, excellent rate capability, and long cycling capability (98% after 10,000 cycles). 展开更多
关键词 rice straw Graphene-like activated carbon SUPERCAPACITOR 2D-layer
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Single and Binary Dye Adsorption of Methylene Blue and Methyl Orange in Alcohol Aqueous Solution via Rice Husk Based Activated Carbon:Kinetics and Equilibrium Studies 被引量:2
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作者 LI Ying PAN Bo +3 位作者 MIAO Hongyan XU Humin LIU Xuefeng SHI Gang 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2020年第6期1272-1278,共7页
The present work was mainly focused on the single and binary adsorption of methylene blue(MB)and methyl orange(MO)from alcohol aqueous solution over rice husk based activated carbon(RHAC).The study of single dye adsor... The present work was mainly focused on the single and binary adsorption of methylene blue(MB)and methyl orange(MO)from alcohol aqueous solution over rice husk based activated carbon(RHAC).The study of single dye adsorption equilibrium experiments found that the Langmuir adsorption model was consistent with the adsorption behavior of RHAC on MB and MO,indicating that it was a single layer adsorption.The adsorption behavior con-formed to the pscudo-second-order kinetic model.The binary dye adsorption experiments showed that the Lang-muir-Freundlich model could be applied to describe the adsorption behavior of RHAC on MB and MO.Comparation with the single dye system,the adsorption capacity on the binary dye system was larger,and there was"competitive adsorption"and"synergistic adsorption"effects existed.Meanwhile,the pseudo-second-order kinetic model also fit for the binary dye adsorption behavior. 展开更多
关键词 rice husk based activated carbon Single dye adsorption Binary dye adsorption Equilibrium adsorption model Kinetics study
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生物质稻壳基多孔炭载铁催化剂实验设计
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作者 刘成超 向员力 +2 位作者 谢芙蓉 赵燕熹 张煜华 《广州化工》 CAS 2023年第17期107-109,112,共4页
介绍一个利用生物质稻壳资源制备多孔炭负载铁催化剂的绿色化学综合实验。实验设计基于有机化学、物理化学与仪器分析等学科知识,采用高温碳化方法,将溶剂萃取和碱液溶解处理后的稻壳制备成多孔活性炭载体,负载铁催化剂用于合成气制液... 介绍一个利用生物质稻壳资源制备多孔炭负载铁催化剂的绿色化学综合实验。实验设计基于有机化学、物理化学与仪器分析等学科知识,采用高温碳化方法,将溶剂萃取和碱液溶解处理后的稻壳制备成多孔活性炭载体,负载铁催化剂用于合成气制液体燃料反应,实现了稻壳资源的综合利用。实验涉及的反应兼具综合性和设计性,符合绿色化学理念。通过本实验不仅可以培养学生的化学基本素养,也有助于强化学生的科学创新思维,锻炼学生的知识综合运用能力。 展开更多
关键词 绿色化学 稻壳 化学综合实验 活性炭
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稻壳和稻壳生物炭对镉污染土壤肥力及镉有效性的影响
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作者 李尚珂 胡嘉源 +2 位作者 陈岩 施维林 史广宇 《中国土壤与肥料》 CAS CSCD 北大核心 2023年第12期78-85,共8页
在镉(Cd)污染土壤中添加等碳量的稻壳及稻壳生物炭,研究不同材料对Cd污染土壤理化性质、肥力、酶活性及重金属Cd有效态含量的影响。共设置4个处理组,未被Cd污染土壤(CK)、Cd污染土壤(CD)、添加2%生物炭的Cd污染土壤(BO)、添加等碳量的稻... 在镉(Cd)污染土壤中添加等碳量的稻壳及稻壳生物炭,研究不同材料对Cd污染土壤理化性质、肥力、酶活性及重金属Cd有效态含量的影响。共设置4个处理组,未被Cd污染土壤(CK)、Cd污染土壤(CD)、添加2%生物炭的Cd污染土壤(BO)、添加等碳量的稻壳Cd污染土壤(DK)。试验结果表明,BO和DK组的土壤总有机碳含量较CD组分别提高10.05%和5.02%,DK组的可溶性有机碳含量在第60 d,比CD组高出43.90%,BO组培养第90 d时,比CD组高13.00%;BO组的碱解氮含量对比CD显著降低,DK组的碱解氮含量对比CD组显著升高。不同处理组对酶活性有不同影响,第45 d时,BO和DK组的脲酶活性较CD组显著提高,分别提高10.14%和8.61%;施加稻壳和稻壳生物炭均能显著提高土壤中的蔗糖酶活性,但BO组显著低于DK组。不同处理对土壤理化性质有不同的影响,DK和BO组均显著提升土壤的孔隙度、初始孔隙比和土壤中砂粒、黏粒的比例;土壤重金属有效态试验结果表明,DK组中Cd污染土壤中的酸可提取态Cd的含量显著降低。对比施入稻壳生物炭,施加稻壳能够短期提升土壤肥力;生物炭和稻壳均能提升土壤的孔隙度和比重,使土壤中的黏粒占比上升;稻壳生物炭及稻壳均能缓解Cd对酶活性的抑制作用;相比生物炭而言,稻壳更能显著降低土壤中酸提取态的Cd含量。 展开更多
关键词 生物炭 稻壳 等碳量 土壤肥力 土壤酶活性
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磷酸活化对活性炭及铅炭电池性能的影响
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作者 原野 孙晓飞 +1 位作者 张湘琳 熊源泉 《电池》 CAS 北大核心 2023年第3期271-275,共5页
铅炭电池兼具铅酸电池和超级电容器的优点。为进一步提高铅炭电池的性能,以稻壳为碳源、磷酸(H_(3)PO_(4))为活化剂,制备铅炭电池用稻壳基活性炭,考察浸渍比、活化温度和活化时间等参数对活性炭物化特性及铅炭电池性能的影响。控制活化... 铅炭电池兼具铅酸电池和超级电容器的优点。为进一步提高铅炭电池的性能,以稻壳为碳源、磷酸(H_(3)PO_(4))为活化剂,制备铅炭电池用稻壳基活性炭,考察浸渍比、活化温度和活化时间等参数对活性炭物化特性及铅炭电池性能的影响。控制活化参数,可改变活性炭的孔隙结构:浸渍比越高,比表面积和介孔率越大;550℃的活化温度更适用于合成高介孔率的活性炭;当活化时间在90 min以上时,微孔、介孔倾向于塌陷成大孔。在浸渍比1.00∶3.85、活化温度550℃及活化时间90 min下合成的活性炭,兼具高比表面积(1 087.6 m^(2)/g)和高介孔率(85.31%),应用于负极中,可提高铅炭电池的高倍率部分荷电状态(HRPSoC)循环寿命:循环寿命高达13 738次,是空白电极的29.9倍。 展开更多
关键词 稻壳 铅炭电池 磷酸 活化参数 活性炭
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Multiple Functional Biomass-Derived Activated Carbon Materials for Aqueous Supercapacitors, Lithium-Ion Capacitors and Lithium-Sulfur Batteries 被引量:4
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作者 Kunfeng Chen Dongfeng Xue 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2017年第6期861-866,共6页
Biomass-derived activated carbon electrode materials have been synthesized by carbonization and KOH activa- tion processes from an agriculture waste - rice husk, composed of organic compound and silica. The surface ar... Biomass-derived activated carbon electrode materials have been synthesized by carbonization and KOH activa- tion processes from an agriculture waste - rice husk, composed of organic compound and silica. The surface area of activated carbon reached 1098.1 m2/g mainly including mesopores and macropores due to the template effect of sil- ica in rice husk. Owing to the existence of mesopores and macropores, the as-obtained activated carbon materials can be used in aqueous supercapacitors, lithium-ion (Li-ion) capacitors and lithium-sulfur (Li-S) batteries. In KOH electrolyte, fast rate performance (as high as 2 V/s) was obtained due to the existence of ideal electrical double layer capacitance. In organic electrolyte, high voltage (2.5 V) was achieved. Activated carbon electrode for Li-ion capac- itor also showed capacity of 17 mAh/g at 100 mA/g with the high voltage range of 2.5 V. The capacities of sul- fur-activated carbon in Li-S batteries were 1230 and 970 mAh/g at the current densities of 0.1 and 0.2 C. The pre- sent results showed that activated carbon materials with mesopores were good host to immobilize polysulfides. 展开更多
关键词 activated carbon lithium ion capacitor rice husk biomass utilization organic electrolyte
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活化剂对铁卟啉修饰的稻壳碳催化剂氧还原反应性能的影响
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作者 谢琬玥 黄基斌 +2 位作者 吴家杰 凌晨 刘海洋 《广东轻工职业技术学院学报》 2023年第6期1-5,共5页
稻壳碳(RHC)材料由于其产量丰富,价格低廉,近年来已被应用于多种工业领域。阴极上电催化氧还原反应(ORR)的缓慢动力学是限制燃料电池性能的关键因素,用稻壳碳材料制备价格低廉的ORR催化剂具有良好的应用前景。对稻壳碳材料的制备条件进... 稻壳碳(RHC)材料由于其产量丰富,价格低廉,近年来已被应用于多种工业领域。阴极上电催化氧还原反应(ORR)的缓慢动力学是限制燃料电池性能的关键因素,用稻壳碳材料制备价格低廉的ORR催化剂具有良好的应用前景。对稻壳碳材料的制备条件进行优化,探究K2CO3、KOH两种活化剂对所制备铁卟啉修饰的稻壳材料ORR性能的影响。结果表明,在以稻壳碳(RHC)K 2CO3 KOH=133的比例进行活化处理时,得到的RHC材料具有最大的比表面积和更加适宜的孔结构,在铁卟啉衍生化后具有最优的ORR性能,其半波电位为0.865 V,具有与Pt/C相近的塔菲尔斜率,且ORR过程接近四电子还原。 展开更多
关键词 稻壳 碳材料 活化剂 铁卟啉 氧还原反应
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稻壳制备活性炭联产二氧化硅工艺研究
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作者 叶波 《化工设计通讯》 CAS 2023年第12期80-82,共3页
当前,随着社会经济的不断发展,人们对于稻壳的二次利用及节能意识开始不断提升,稻壳是稻谷进行加工后的一种副产品,以往均是作为废弃物品进行处理的,最多也只是被用于燃料,在一定程度上造成了资源的浪费,同时还会对环境带来严重影响和污... 当前,随着社会经济的不断发展,人们对于稻壳的二次利用及节能意识开始不断提升,稻壳是稻谷进行加工后的一种副产品,以往均是作为废弃物品进行处理的,最多也只是被用于燃料,在一定程度上造成了资源的浪费,同时还会对环境带来严重影响和污染,基于此,对稻壳进行加工利用是当下实现可持续环保理念发展的重要课题。首先简单阐述了稻壳的相关特性,然后就稻壳制备活性炭及二氧化硅进行深入研究。 展开更多
关键词 稻壳 活性炭 二氧化硅 工艺研究
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由稻壳制备高比表面积活性炭 被引量:60
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作者 郭玉鹏 杨少凤 +2 位作者 赵敬哲 王子忱 赵慕愚 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2000年第3期335-338,共4页
以稻壳为原料 ,KOH为活化剂制备了高比表面积活性炭 ,其比表面积超过 30 0 0 m2 /g,且孔径均一 。
关键词 活性炭 稻壳 氢氧化钾 比表面积 吸附剂 制备
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耕作措施对长期免耕双季稻田土壤碳库的影响 被引量:25
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作者 孙国峰 陈阜 +3 位作者 李琳 伍芬琳 肖小平 张海林 《中国农业大学学报》 CAS CSCD 北大核心 2007年第6期45-49,共5页
针对南方稻田长期免耕存在的主要问题,本研究选择湖南省双季稻区连续7年免耕稻田,进行了不同耕作措施对土壤的总有机碳、活性有机碳的变化情况及其对土壤碳库影响的研究,以期为建立合理的轮耕周期提供理论依据。结果表明:0~20cm平... 针对南方稻田长期免耕存在的主要问题,本研究选择湖南省双季稻区连续7年免耕稻田,进行了不同耕作措施对土壤的总有机碳、活性有机碳的变化情况及其对土壤碳库影响的研究,以期为建立合理的轮耕周期提供理论依据。结果表明:0~20cm平均总有机碳和活性有机碳含量均为旋耕〉连续免耕〉翻耕。与连续免耕相比,旋耕有利于提高土壤活性有机碳含量(比连续免耕提高了5.08%),翻耕则会促进土壤活性有机碳分解(比连续免耕降低了2.73%)。晚稻收获时0~20cm平均碳库管理指数也表现为旋耕〉连续免耕〉翻耕,其中翻耕使碳库管理指数整体上显著降低(比连续免耕降低了21.7%);旋耕略有提高(比连续免耕提高了3.9%),但未达到显著水平(P〈0.05)。总之,与连续免耕相比,翻耕可促进土壤活性有机碳分解,进而显著降低碳库管理指数;但旋耕差异不显著(P〈0.05)。 展开更多
关键词 免耕 轮耕 有机碳 活性有机碳 碳库管理指数 双季稻
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由稻壳灰制备活性炭的工艺及应用研究 被引量:26
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作者 卫延安 朱春山 +1 位作者 蔡春 吕春绪 《中国粮油学报》 EI CAS CSCD 北大核心 2003年第6期29-33,共5页
对利用稻壳灰与碱反应制备活性炭、水玻璃及白炭黑的工艺条件进行了研究 ,通过单因素实验和正交实验 ,筛选出了反应的最佳工艺条件 :稻壳灰与KOH配比为 1∶0 .2 2 ,反应时间 4h ,反应压力 0 .6MPa。在此条件下二氧化硅的溶出率为 95 % ... 对利用稻壳灰与碱反应制备活性炭、水玻璃及白炭黑的工艺条件进行了研究 ,通过单因素实验和正交实验 ,筛选出了反应的最佳工艺条件 :稻壳灰与KOH配比为 1∶0 .2 2 ,反应时间 4h ,反应压力 0 .6MPa。在此条件下二氧化硅的溶出率为 95 % ,硅酸钾的模数为 2 .8~ 3.2 ,白炭黑的白度在 90 %以上。提出了提高产品质量的有效方法 ,对产品的应用性能也作了分析。实验结果表明采用炭化稻壳为原料生产的活性炭、白炭黑及水玻璃质量完全达到了相应的国家标准 。 展开更多
关键词 稻壳灰 活性炭 制备工艺 白炭黑 硅酸钾 工艺条件
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碱炭比及活化温度对稻壳活性炭极微孔的影响 被引量:12
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作者 李大伟 马腾飞 +2 位作者 田原宇 朱锡锋 乔英云 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2015年第1期17-22,共6页
采用N2吸附、CO2吸附和热重红外联用等技术手段,考察了在KOH活化稻壳炭的过程中碱炭比和活化温度对活性炭极微孔的影响。结果表明:在不同碱炭比(0.6︰1~3︰1)和活化温度(640~780℃)下制备的稻壳活性炭,极微孔主要分布在0.42~0.70 n... 采用N2吸附、CO2吸附和热重红外联用等技术手段,考察了在KOH活化稻壳炭的过程中碱炭比和活化温度对活性炭极微孔的影响。结果表明:在不同碱炭比(0.6︰1~3︰1)和活化温度(640~780℃)下制备的稻壳活性炭,极微孔主要分布在0.42~0.70 nm。当碱炭比增加时,极微孔孔容先增大后减小;而当活化温度升高时,极微孔孔容呈降低趋势。极微孔率随碱炭比或活化温度的升高而单调递减。在活化温度为640℃、碱炭比为1:1时,可得极微孔孔容为0.149 m L/g、极微孔率达36.3%的微孔活性炭。活性炭的极微孔孔容与其在104 Pa时的CO2吸附量高度线性相关。 展开更多
关键词 活性炭 极微孔 KOH 稻壳
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磷酸活化稻秆制备中孔活性炭的研究 被引量:12
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作者 卢辛成 蒋剑春 +2 位作者 孙康 谢新苹 王金表 《林产化学与工业》 EI CAS CSCD 北大核心 2013年第4期43-47,共5页
以稻秆为原料,通过磷酸法活化制备得到了中孔活性炭,并采用氮气吸附、元素分析和扫描电镜对其进行了表征分析。实验结果表明:稻秆制备活性炭的工艺条件为10 g稻秆,浸渍比3∶1(质量比),在140℃下预活化60 min,活化温度450℃,活化时间60 ... 以稻秆为原料,通过磷酸法活化制备得到了中孔活性炭,并采用氮气吸附、元素分析和扫描电镜对其进行了表征分析。实验结果表明:稻秆制备活性炭的工艺条件为10 g稻秆,浸渍比3∶1(质量比),在140℃下预活化60 min,活化温度450℃,活化时间60 min。在此条件下制备得到的活性炭得率为25%,亚甲基蓝吸附值215 mg/g,碘吸附值835 mg/g,A法焦糖值110%,灰分3.03%,其比表面积为967.7 m2/g,总孔容为1.12 cm3/g,平均孔径为4.6 nm,中孔率可以达到84.8%。 展开更多
关键词 稻秆 中孔活性炭 制备 化学法 表征
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