公开(公告)号：US20070210006A1

公开(公告)日：2007-09-13

申请号：US11466636

申请日：2006-08-23

Applicant: Sadhana Suresh Rayalu ,  Pawan Kumar ,  Siddharth Ulhas Meshram ,  Amit Kumar Bansiwal ,  Nitin Kumar Labhsetwar ,  Rishi Narayan Singh ,  Sukumar Devotta

Inventor： Sadhana Suresh Rayalu ,  Pawan Kumar ,  Siddharth Ulhas Meshram ,  Amit Kumar Bansiwal ,  Nitin Kumar Labhsetwar ,  Rishi Narayan Singh ,  Sukumar Devotta

IPC: C02F1/42

CPC classification number: B01J20/186 ,  C01B39/026 ,  C02F1/281 ,  C02F2101/103 ,  C02F2103/06

Abstract: Present invention deals with cost-effective surface-modified zeolite materials developed from commercial zeolites and flyash-based zeolites by treating with surface modifiers like hexadecyltrimethyl ammonium bromide (HDTMA-Br). The formation of zeolitic materials with anionic characteristics requires treatment with a surfactant with initial concentrations greater than its critical micelle concentration (CMC). The sorption of oxyanions on the surfactant-modified zeolite (SMZ) is attributed to surface complexation and surface precipitation. Incorporation of metal ions on SMZ showed improved anion uptake for dearsenification of water due to synergistic effects and is able to meet the stringent target of 10 ppb of As on potable water being adopted by most countries. High selectivity, faster kinetics and high adsorption capacity ensures cost effectiveness of this product as compared to other low-cost products for dearsenification. Zeolite analogues with anionic characteristics have been developed for their applications for removal of arsenic from water. The material developed can also be used to remove other anions like chromium and selenium.

Abstract translation: 本发明涉及通过用诸如十六烷基三甲基溴化铵（HDTMA-Br）的表面改性剂处理从商业沸石和飞灰基沸石开发的经济有效的表面改性沸石材料。 具有阴离子特性的沸石材料的形成需要用初始浓度大于其临界胶束浓度（CMC）的表面活性剂进行处理。 氧杂阴离子对表面活性剂改性沸石（SMZ）的吸附归因于表面络合和表面沉淀。 金属离子在SMZ上的结合表现出改善的阴离子吸收，由于协同作用而使水脱水，并且能够达到大部分国家所采用的10 ppb As对饮用水的严格目标。 与其他低成本脱砷产品相比，高选择性，更快的动力学和高吸附能力确保了该产品的成本效益。 已经开发了具有阴离子特性的沸石类似物用于从水中除去砷的应用。 开发的材料也可用于除去其他阴离子如铬和硒。

公开(公告)号：US20140295518A1

公开(公告)日：2014-10-02

申请号：US14129270

申请日：2012-09-02

Applicant: Sadhana Suresh Rayalu ,  Tapan Chakrabarti ,  Meenal Vivek Joshi ,  Priti Ashok Mangrulkar ,  Nitin Kumar Labhsetwar ,  Renu Mahendra Singh Yadav ,  Chandan Prabhu ,  Satish Ramchandra Wate

Inventor： Sadhana Suresh Rayalu ,  Tapan Chakrabarti ,  Meenal Vivek Joshi ,  Priti Ashok Mangrulkar ,  Nitin Kumar Labhsetwar ,  Renu Mahendra Singh Yadav ,  Chandan Prabhu ,  Satish Ramchandra Wate

IPC: C12P3/00

CPC classification number: C12P3/00 ,  B01J35/004 ,  C01B3/06 ,  C01B32/40 ,  C01B32/60 ,  Y02E60/364

Abstract: The present invention is related to a process for generation of hydrogen and syngas based on biomimetic carbonation and photocatalysis. A path breaking way has been developed for generation of solar fuels in specific hydrogen by coupling biomimetic carbonation with photocatalysis. Efforts are being made worldwide to mimic the reaction for fixation of anthropogenic CO2 into calcium carbonate using carbonic anhydrase (CA) as a biocatalyst. CA is being employed to accelerate the rate of hydration of CO2 to form carbonate ions and proton. Presently carbonate is being precipitated from aqueous solution as calcium carbonate given a suitable saturation of calcium and carbonate ions by addition of appropriate buffer. A major breakthrough in the area of generation of solar fuels like hydrogen has been achieved by coupling biomimetic carbonation with photocatalysis. This approach may prove to be a revolutionary technical advancement required for hydrogen economy demanding carbon neutral hydrogen production. Also the production of hydrogen in addition to carbonates as end products during biomimetic carbonation may make the process commercially viable to be adopted by industries emitting carbon dioxide. The carbonate rich stream has been photocatalytically reduced to formaldehyde. This breakthrough thus opens new horizons in the area of carbon sequestration by virtue of the fact that end product of carbon sequestration is not only environmentally benign product of calcite but it would lead to the generation of clean energy including hydrogen, methane and methanol. Maximum hydrogen evolution has been observed up to 101.14 μmoles/mg of, free CA, 156.8 μmoles/mg of immobilised CA and 101.14 μmoles/mg of CA 6684.5 μmoles/mg of stabilised CA using TiO2/Zn/Pt as photocatalyst. The problem of using Zn as a metal donor has been overcome by illuminating the system. Hydrogen evolution to the tune of 84 μmoles/mg of CA has been observed for system with Zn as metal donor in the presence of Pt as co-catalyst with illumination.

公开(公告)号：US07510659B2

公开(公告)日：2009-03-31

申请号：US11466636

申请日：2006-08-23

Applicant: Sadhana Suresh Rayalu ,  Pawan Kumar ,  Siddharth Ulhas Meshram ,  Amit Kumar Bansiwal ,  Nitin Kumar Labhsetwar ,  Rishi Narayan Singh ,  Sukumar Devotta

Inventor： Sadhana Suresh Rayalu ,  Pawan Kumar ,  Siddharth Ulhas Meshram ,  Amit Kumar Bansiwal ,  Nitin Kumar Labhsetwar ,  Rishi Narayan Singh ,  Sukumar Devotta

IPC: B01J29/04 ,  C02F1/42

CPC classification number: B01J20/186 ,  C01B39/026 ,  C02F1/281 ,  C02F2101/103 ,  C02F2103/06

Abstract: Present invention deals with cost-effective surface-modified zeolite materials developed from commercial zeolites and flyash-based zeolites by treating with surface modifiers like hexadecyltrimethyl ammonium bromide (HDTMA-Br). The formation of zeolitic materials with anionic characteristics requires treatment with a surfactant with initial concentrations greater than its critical micelle concentration (CMC). The sorption of oxyanions on the surfactant-modified zeolite (SMZ) is attributed to surface complexation and surface precipitation. Incorporation of metal ions on SMZ showed improved anion uptake for dearsenification of water due to synergistic effects and is able to meet the stringent target of 10 ppb of As on potable water being adopted by most countries. High selectivity, faster kinetics and high adsorption capacity ensures cost effectiveness of this product as compared to other low-cost products for dearsenification. Zeolite analogues with anionic characteristics have been developed for their applications for removal of arsenic from water. The material developed can also be used to remove other anions like chromium and selenium.

Abstract translation: 本发明涉及通过用诸如十六烷基三甲基溴化铵（HDTMA-Br）的表面改性剂处理从商业沸石和飞灰基沸石开发的经济有效的表面改性沸石材料。 具有阴离子特性的沸石材料的形成需要用初始浓度大于其临界胶束浓度（CMC）的表面活性剂进行处理。 氧杂阴离子对表面活性剂改性沸石（SMZ）的吸附归因于表面络合和表面沉淀。 金属离子在SMZ上的结合表现出改善的阴离子吸收，由于协同效应使水脱水，能够达到大部分国家采用的10 ppb的饮用水的严格目标。 与其他低成本脱砷产品相比，高选择性，更快的动力学和高吸附能力确保了该产品的成本效益。 已经开发了具有阴离子特性的沸石类似物用于从水中除去砷的应用。 开发的材料也可用于除去其他阴离子如铬和硒。