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Effects of bicarbonate and cathode potential on hydrogen production in a biocathode electrolysis cell

Dawei LIANG,Yanyan LIU,Sikan PENG,Fei LAN,Shanfu LU,Yan XIANG

《环境科学与工程前沿（英文）》 2014年 第8卷 第4期   页码 624-630 doi: 10.1007/s11783-013-0584-2

摘要： A biocathode with microbial catalyst in place of a noble metal was successfully developed for hydrogen evolution in a microbial electrolysis cell (MEC). The strategy for fast biocathode cultivation was demonstrated. An exoelectrogenic reaction was initially extended with an H -full atmosphere to enrich H -utilizing bacteria in a MEC bioanode. This bioanode was then inversely polarized with an applied voltage in a half-cell to enrich the hydrogen-evolving biocathode. The electrocatalytic hydrogen evolution reaction (HER) kinetics of the biocathode MEC could be enhanced by increasing the bicarbonate buffer concentration from 0.05 mol·L to 0.5 mol·L and/or by decreasing the cathode potential from -0.9 V to -1.3 V vs. a saturated calomel electrode (SCE). Within the tested potential region in this study, the HER rate of the biocathode MEC was primarily influenced by the microbial catalytic capability. In addition, increasing bicarbonate concentration enhances the electric migration rate of proton carriers. As a consequence, more mass H can be released to accelerate the biocathode-catalyzed HER rate. A hydrogen production rate of 8.44 m ·m ·d with a current density of 951.6 A·m was obtained using the biocathode MEC under a cathode potential of -1.3 V vs. SCE and 0.4 mol·L bicarbonate. This study provided information on the optimization of hydrogen production in biocathode MEC and expanded the practical applications thereof.

关键词： microbial electrolysis cell (MEC)     biocathode     hydrogen production     bicarbonate     cathode potential    

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Preliminary results of gentamycin combined with sodium bicarbonate for prevention of irinotecan-induced

Qi MEI MM, Zhe CAO MM, Hua XIONG MD, Yuan CHEN MD,

《医学前沿（英文）》 2009年 第3卷 第4期   页码 470-474 doi: 10.1007/s11684-009-0077-7

摘要： The aim of this paper was to observe the clinical effect of gentamycin combined with sodium bicarbonate for the prevention of irinotecan-induced diarrhea. A total of 98 patients with stage IV cancers were recruited and divided into a prevention group (52 patients) and a control group (46 patients). All patients received the chemotherapy including irinotecan. The prevention group received gentamycin and sodium bicarbonate before the use of irinotecan for 4 days; the control group did not receive any prevention. The use of gentamycin and sodium bicarbonate resulted in significantly higher stool pH ( < 0.001), while the incidence of diarrhea by irinotecan was reduced (prevention group 13.70% control group 34.83%; < 0.001). Gentamycin combined with sodium bicarbonate appears to be useful in preventing the diarrhea induced by irinotecan and reducing the dosage of loperamide and fluid replacement.

关键词： irinotecan     diarrhea     gentamycin     sodium bicarbonate     prevention    

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Effect of sodium bicarbonate solution on methyltrimethoxysilane-derived silica aerogels dried at ambient

Yujing Liu, Xiao Han, Balati Kuerbanjiang, Vlado K. Lazarov, Lidija Šiller

《化学科学与工程前沿（英文）》 2021年 第15卷 第4期   页码 954-959 doi: 10.1007/s11705-020-2028-4

摘要： Here we present an economical ambient pressure drying method of preparing monolithic silica aerogels from methyltrimethoxysilane precursor while using sodium bicarbonate solution as the exchanging solvent. We prepared silica aerogels with a density and a specific surface area of 0.053 g∙cm and 423 m ∙g , respectively. The average pore diameter of silica aerogels is 23 nm as the pore specific volume is 1.11 cm ∙g . Further, the contact angle between water droplet and the surface of silica aerogels in specific condition can be as high as 166°, which indicates a super-hydrophobic surface of aerogels.

关键词： silica aerogel     methyltrimethoxysilane     solvent exchange     sodium bicarbonate     trimethylchlorosilane     ambient pressure drying    

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Removal of SO

Xiaolei LI, Chunying ZHU, Youguang MA

《化学科学与工程前沿（英文）》 2013年 第7卷 第2期   页码 185-191 doi: 10.1007/s11705-013-1326-5

摘要： In this work, the removal of SO from gas mixture with air and SO by ammonium bicarbonate aqueous solution as absorbent was investigated experimentally in a bubble column reactor. The effects of the concentration of ammonium bicarbonate, the SO inlet concentration of gas phase and the gas flow rate on the removal rate of SO were studied. The results showed that the higher the SO inlet concentration and the gas flow rate, the shorter the lasting time of SO completely removed in gas outlet, and then the faster the decrease in the removal rate of SO . The lasting time of SO completely removed in gas outlet increased with increasing ammonium bicarbonate concentration. During the process of SO absorption, there was a critical pH of solution. When the solution pH was less than the critical pH, it would sharply fall, resulting in a rapid decrease of the SO removal rate. A theoretical model for predicting the SO removal rate has been developed by taking the chemical enhancement and the sulfite concentration in the liquid phase into account simultaneously.

关键词： SO2 removal     bubble column reactor     removal rate     ammonium bicarbonate     absorbent    

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Efficient production of hydrogen peroxide in microbial reverse-electrodialysis cells coupled with thermolytic solutions

《环境科学与工程前沿（英文）》 2023年 第17卷 第9期 doi: 10.1007/s11783-023-1708-y

摘要：

● Appreciable H2O2 production rate was achieved in MRCs utilizing NH4HCO3 solutions.

关键词： Microbial reverse-electrodialysis cell     Hydrogen peroxide production     Ammonium bicarbonate     Electrolysis cell     Optimization    

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桐柏安棚碱矿扩边的理论与方法

王胜利,齐铁新,刘建中,李山岭,董峰 ,李守刚, 张绍宇,王上行

《中国工程科学》 2010年 第12卷 第2期   页码 52-56

摘要：

介绍桐柏安棚碱矿扩边勘探过程，提出碱矿探边的一些基本原则，及探边使用的理论、技术、方法。经检验，这套理论、技术、方法是实用的，扩边结果与开发实践基本吻合，为碱矿生产、继续发展提供了依据，减少了不必要的浪费与开支。

关键词： 深静水环境     碱矿探边     重力二次导数     白云岩    

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Boosting the direct conversion of NHHCO electrolyte to syngas on Ag/Zn zeolitic imidazolate framework derived nitrogen-carbon skeleton

《化学科学与工程前沿（英文）》 2023年 第17卷 第9期   页码 1196-1207 doi: 10.1007/s11705-022-2289-1

摘要： The electrochemical reduction of NH4HCO3 to syngas can bypass the high energy consumption of high-purity CO2 release and compression after the ammonia-based CO2 capture process. This technology has broad prospects in industrial applications and carbon neutrality. A zeolitic imidazolate framework-8 precursor was introduced with different Ag contents via colloid chemical synthesis. This material was carbonized at 1000 °C to obtain AgZn zeolitic imidazolate framework derived nitrogen carbon catalysts, which were used for the first time for boosting the direct conversion of NH4HCO3 electrolyte to syngas. The AgZn zeolitic imidazolate framework derived nitrogen carbon catalyst with a Ag/Zn ratio of 0.5:1 achieved the highest CO Faradaic efficiency of 52.0% with a current density of 1.15 mA·cm–2 at –0.5 V, a H2/CO ratio of 1–2 (–0.5 to –0.7 V), and a stable catalytic activity of more than 6 h. Its activity is comparable to that of the CO2-saturated NH4HCO3 electrolyte. The highly discrete Ag-Nx and Zn-Nx nodes may have combined catalytic effects in the catalysts synthesized by appropriate Ag doping and sufficient carbonization. These nodes could increase active sites of catalysts, which is conducive to the transport and adsorption of reactant CO2 and the stability of *COOH intermediate, thus can improve the selectivity and catalytic activity of CO.

关键词： Ag catalyst     zeolitic imidazolate framework     CO2 electroreduction     ammonium bicarbonate electrolyte     syngas    

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Process evaluation of an alternating aerobic-anoxic process applied in a sequencing batch reactor for nitrogen removal

ZENG Wei, PENG Yongzhen, WANG Shuying

《环境科学与工程前沿（英文）》 2007年 第1卷 第1期   页码 28-32 doi: 10.1007/s11783-007-0005-5

摘要： In order to improve the nitrogen removal efficiency and save operational cost, the feasibility of the alternating aerobic-anoxic process (AAA process) applied in a sequencing batch reactor (SBR) system for nitrogen removal was investigated. Under sufficient influent alkalinity, the AAA process did not have an advantage over one aerobicanoxic (OAA) cycle on treatment efficiency because microorganisms had an adaptive stage at the alternating aerobic-anoxic transition, which would prolong the total cycling time. On the contrary, the AAA process made the system control more complicated. Under deficient influent alkalinity, when compared to OAA, the AAA process improved treatment efficiency and effluent quality with NH-N in the effluent below the detection limit. In the nitrification, the average stoichiometric ratio between alkalinity consumption and ammonia oxidation is calculated to be 7.07 mg CaCO/mg NH-N. In the denitrification, the average stoichiometric ratio between alkalinity production and NO-N reduction is about 3.57 mg CaCO/mg NO-N. As a result, half of the alkalinity previously consumed during the aerobic nitrification was recovered during the subsequent anoxic denitrification period. That was why the higher treatment efficiency in the AAA process was achieved without the supplement of bicarbonate alkalinity. If the lack of alkalinity in the influent was less than 1/3 of that needed, there is no need for external alkalinity addition and treatment efficiency was the same as that under sufficient influent alkalinity. Even if the lack of alkalinity in the influent was more than 1/3 of that needed, the AAA process was an optimal strategy because it reduced the external alkalinity addition and saved on operational cost.

关键词： bicarbonate alkalinity     sufficient influent     influent alkalinity     detection     alkalinity production    

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标题 作者 时间 类型 操作

Effects of bicarbonate and cathode potential on hydrogen production in a biocathode electrolysis cell

Dawei LIANG,Yanyan LIU,Sikan PENG,Fei LAN,Shanfu LU,Yan XIANG

期刊论文

Preliminary results of gentamycin combined with sodium bicarbonate for prevention of irinotecan-induced

Qi MEI MM, Zhe CAO MM, Hua XIONG MD, Yuan CHEN MD,

期刊论文

Effect of sodium bicarbonate solution on methyltrimethoxysilane-derived silica aerogels dried at ambient

Yujing Liu, Xiao Han, Balati Kuerbanjiang, Vlado K. Lazarov, Lidija Šiller

期刊论文

Removal of SO

Xiaolei LI, Chunying ZHU, Youguang MA

期刊论文

Efficient production of hydrogen peroxide in microbial reverse-electrodialysis cells coupled with thermolytic solutions

期刊论文

桐柏安棚碱矿扩边的理论与方法

王胜利,齐铁新,刘建中,李山岭,董峰 ,李守刚, 张绍宇,王上行

期刊论文

Boosting the direct conversion of NHHCO electrolyte to syngas on Ag/Zn zeolitic imidazolate framework derived nitrogen-carbon skeleton

期刊论文

Process evaluation of an alternating aerobic-anoxic process applied in a sequencing batch reactor for nitrogen removal

ZENG Wei, PENG Yongzhen, WANG Shuying

期刊论文